xdg-shell: handle clients launched in fullscreen

[profile/ivi/weston-ivi-shell.git] / desktop-shell / shell.c

/*
 * Copyright © 2010-2012 Intel Corporation
 * Copyright © 2011-2012 Collabora, Ltd.
 * Copyright © 2013 Raspberry Pi Foundation
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the copyright holders not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  The copyright holders make
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <linux/input.h>
#include <assert.h>
#include <signal.h>
#include <math.h>
#include <sys/types.h>

#include "shell.h"
#include "desktop-shell-server-protocol.h"
#include "workspaces-server-protocol.h"
#include "../shared/config-parser.h"
#include "xdg-shell-server-protocol.h"

#define DEFAULT_NUM_WORKSPACES 1
#define DEFAULT_WORKSPACE_CHANGE_ANIMATION_LENGTH 200

#ifndef static_assert
#define static_assert(cond, msg)
#endif

struct focus_state {
        struct weston_seat *seat;
        struct workspace *ws;
        struct weston_surface *keyboard_focus;
        struct wl_list link;
        struct wl_listener seat_destroy_listener;
        struct wl_listener surface_destroy_listener;
};

enum shell_surface_type {
        SHELL_SURFACE_NONE,
        SHELL_SURFACE_TOPLEVEL,
        SHELL_SURFACE_POPUP,
        SHELL_SURFACE_XWAYLAND
};

struct shell_client;

/*
 * Surface stacking and ordering.
 *
 * This is handled using several linked lists of surfaces, organised into
 * ‘layers’. The layers are ordered, and each of the surfaces in one layer are
 * above all of the surfaces in the layer below. The set of layers is static and
 * in the following order (top-most first):
 *  • Lock layer (only ever displayed on its own)
 *  • Cursor layer
 *  • Input panel layer
 *  • Fullscreen layer
 *  • Panel layer
 *  • Workspace layers
 *  • Background layer
 *
 * The list of layers may be manipulated to remove whole layers of surfaces from
 * display. For example, when locking the screen, all layers except the lock
 * layer are removed.
 *
 * A surface’s layer is modified on configuring the surface, in
 * set_surface_type() (which is only called when the surface’s type change is
 * _committed_). If a surface’s type changes (e.g. when making a window
 * fullscreen) its layer changes too.
 *
 * In order to allow popup and transient surfaces to be correctly stacked above
 * their parent surfaces, each surface tracks both its parent surface, and a
 * linked list of its children. When a surface’s layer is updated, so are the
 * layers of its children. Note that child surfaces are *not* the same as
 * subsurfaces — child/parent surfaces are purely for maintaining stacking
 * order.
 *
 * The children_link list of siblings of a surface (i.e. those surfaces which
 * have the same parent) only contains weston_surfaces which have a
 * shell_surface. Stacking is not implemented for non-shell_surface
 * weston_surfaces. This means that the following implication does *not* hold:
 *     (shsurf->parent != NULL) ⇒ !wl_list_is_empty(shsurf->children_link)
 */

struct shell_surface {
        struct wl_resource *resource;
        struct wl_signal destroy_signal;
        struct shell_client *owner;

        struct weston_surface *surface;
        struct weston_view *view;
        int32_t last_width, last_height;
        struct wl_listener surface_destroy_listener;
        struct wl_listener resource_destroy_listener;

        struct weston_surface *parent;
        struct wl_list children_list;  /* child surfaces of this one */
        struct wl_list children_link;  /* sibling surfaces of this one */
        struct desktop_shell *shell;

        enum shell_surface_type type;
        char *title, *class;
        int32_t saved_x, saved_y;
        int32_t saved_width, saved_height;
        bool saved_position_valid;
        bool saved_size_valid;
        bool saved_rotation_valid;
        int unresponsive, grabbed;
        uint32_t resize_edges;

        struct {
                struct weston_transform transform;
                struct weston_matrix rotation;
        } rotation;

        struct {
                struct wl_list grab_link;
                int32_t x, y;
                struct shell_seat *shseat;
                uint32_t serial;
        } popup;

        struct {
                int32_t x, y;
                uint32_t flags;
        } transient;

        struct {
                enum wl_shell_surface_fullscreen_method type;
                struct weston_transform transform; /* matrix from x, y */
                uint32_t framerate;
                struct weston_view *black_view;
        } fullscreen;

        struct weston_transform workspace_transform;

        struct weston_output *fullscreen_output;
        struct weston_output *output;
        struct wl_list link;

        const struct weston_shell_client *client;

        struct surface_state {
                bool maximized;
                bool fullscreen;
                bool relative;
                bool lowered;
        } state, next_state, requested_state; /* surface states */
        bool state_changed;
        bool state_requested;

        struct {
                int32_t x, y, width, height;
        } geometry, next_geometry;
        bool has_set_geometry, has_next_geometry;

        int focus_count;
};

struct shell_grab {
        struct weston_pointer_grab grab;
        struct shell_surface *shsurf;
        struct wl_listener shsurf_destroy_listener;
};

struct shell_touch_grab {
        struct weston_touch_grab grab;
        struct shell_surface *shsurf;
        struct wl_listener shsurf_destroy_listener;
        struct weston_touch *touch;
};

struct weston_move_grab {
        struct shell_grab base;
        wl_fixed_t dx, dy;
        int client_initiated;
};

struct weston_touch_move_grab {
        struct shell_touch_grab base;
        int active;
        wl_fixed_t dx, dy;
};

struct rotate_grab {
        struct shell_grab base;
        struct weston_matrix rotation;
        struct {
                float x;
                float y;
        } center;
};

struct shell_seat {
        struct weston_seat *seat;
        struct wl_listener seat_destroy_listener;
        struct weston_surface *focused_surface;

        struct wl_listener caps_changed_listener;
        struct wl_listener pointer_focus_listener;
        struct wl_listener keyboard_focus_listener;

        struct {
                struct weston_pointer_grab grab;
                struct weston_touch_grab touch_grab;
                struct wl_list surfaces_list;
                struct wl_client *client;
                int32_t initial_up;
                enum { POINTER, TOUCH } type;
        } popup_grab;
};

struct shell_client {
        struct wl_resource *resource;
        struct wl_client *client;
        struct desktop_shell *shell;
        struct wl_listener destroy_listener;
        struct wl_event_source *ping_timer;
        uint32_t ping_serial;
        int unresponsive;
};

static struct desktop_shell *
shell_surface_get_shell(struct shell_surface *shsurf);

static void
surface_rotate(struct shell_surface *surface, struct weston_seat *seat);

static void
shell_fade_startup(struct desktop_shell *shell);

static struct shell_seat *
get_shell_seat(struct weston_seat *seat);

static void
get_output_panel_size(struct desktop_shell *shell,
                      struct weston_output *output,
                      int *width, int *height);

static void
shell_surface_update_child_surface_layers(struct shell_surface *shsurf);

static bool
shell_surface_is_wl_shell_surface(struct shell_surface *shsurf);

static bool
shell_surface_is_xdg_surface(struct shell_surface *shsurf);

static bool
shell_surface_is_xdg_popup(struct shell_surface *shsurf);

static void
shell_surface_set_parent(struct shell_surface *shsurf,
                         struct weston_surface *parent);

static bool
shell_surface_is_top_fullscreen(struct shell_surface *shsurf)
{
        struct desktop_shell *shell;
        struct weston_view *top_fs_ev;

        shell = shell_surface_get_shell(shsurf);

        if (wl_list_empty(&shell->fullscreen_layer.view_list.link))
                return false;

        top_fs_ev = container_of(shell->fullscreen_layer.view_list.link.next,
                                 struct weston_view,
                                 layer_link.link);
        return (shsurf == get_shell_surface(top_fs_ev->surface));
}

static void
destroy_shell_grab_shsurf(struct wl_listener *listener, void *data)
{
        struct shell_grab *grab;

        grab = container_of(listener, struct shell_grab,
                            shsurf_destroy_listener);

        grab->shsurf = NULL;
}

struct weston_view *
get_default_view(struct weston_surface *surface)
{
        struct shell_surface *shsurf;
        struct weston_view *view;

        if (!surface || wl_list_empty(&surface->views))
                return NULL;

        shsurf = get_shell_surface(surface);
        if (shsurf)
                return shsurf->view;

        wl_list_for_each(view, &surface->views, surface_link)
                if (weston_view_is_mapped(view))
                        return view;

        return container_of(surface->views.next, struct weston_view, surface_link);
}

static void
popup_grab_end(struct weston_pointer *pointer);
static void
touch_popup_grab_end(struct weston_touch *touch);

static void
shell_grab_start(struct shell_grab *grab,
                 const struct weston_pointer_grab_interface *interface,
                 struct shell_surface *shsurf,
                 struct weston_pointer *pointer,
                 enum desktop_shell_cursor cursor)
{
        struct desktop_shell *shell = shsurf->shell;

        popup_grab_end(pointer);
        if (pointer->seat->touch)
                touch_popup_grab_end(pointer->seat->touch);

        grab->grab.interface = interface;
        grab->shsurf = shsurf;
        grab->shsurf_destroy_listener.notify = destroy_shell_grab_shsurf;
        wl_signal_add(&shsurf->destroy_signal,
                      &grab->shsurf_destroy_listener);

        shsurf->grabbed = 1;
        weston_pointer_start_grab(pointer, &grab->grab);
        if (shell->child.desktop_shell) {
                desktop_shell_send_grab_cursor(shell->child.desktop_shell,
                                               cursor);
                weston_pointer_set_focus(pointer,
                                         get_default_view(shell->grab_surface),
                                         wl_fixed_from_int(0),
                                         wl_fixed_from_int(0));
        }
}

static void
get_output_panel_size(struct desktop_shell *shell,
                      struct weston_output *output,
                      int *width,
                      int *height)
{
        struct weston_view *view;

        *width = 0;
        *height = 0;

        if (!output)
                return;

        wl_list_for_each(view, &shell->panel_layer.view_list.link, layer_link.link) {
                float x, y;

                if (view->surface->output != output)
                        continue;

                switch (shell->panel_position) {
                case DESKTOP_SHELL_PANEL_POSITION_TOP:
                case DESKTOP_SHELL_PANEL_POSITION_BOTTOM:

                        weston_view_to_global_float(view,
                                                    view->surface->width, 0,
                                                    &x, &y);

                        *width = (int) x;
                        *height = view->surface->height + (int) y;
                        return;

                case DESKTOP_SHELL_PANEL_POSITION_LEFT:
                case DESKTOP_SHELL_PANEL_POSITION_RIGHT:
                        weston_view_to_global_float(view,
                                                    0, view->surface->height,
                                                    &x, &y);

                        *width = view->surface->width + (int) x;
                        *height = (int) y;
                        return;

                default:
                        /* we've already set width and height to
                         * fallback values. */
                        break;
                }
        }

        /* the correct view wasn't found */
}

static void
get_output_work_area(struct desktop_shell *shell,
                     struct weston_output *output,
                     pixman_rectangle32_t *area)
{
        int32_t panel_width = 0, panel_height = 0;

        area->x = 0;
        area->y = 0;

        get_output_panel_size(shell, output, &panel_width, &panel_height);

        switch (shell->panel_position) {
        case DESKTOP_SHELL_PANEL_POSITION_TOP:
        default:
                area->y = panel_height;
        case DESKTOP_SHELL_PANEL_POSITION_BOTTOM:
                area->width = output->width;
                area->height = output->height - panel_height;
                break;
        case DESKTOP_SHELL_PANEL_POSITION_LEFT:
                area->x = panel_width;
        case DESKTOP_SHELL_PANEL_POSITION_RIGHT:
                area->width = output->width - panel_width;
                area->height = output->height;
                break;
        }
}

static void
send_configure_for_surface(struct shell_surface *shsurf)
{
        int32_t width, height;
        struct surface_state *state;

        if (shsurf->state_requested)
                state = &shsurf->requested_state;
        else if (shsurf->state_changed)
                state = &shsurf->next_state;
        else
                state = &shsurf->state;

        if (state->fullscreen) {
                width = shsurf->output->width;
                height = shsurf->output->height;
        } else if (state->maximized) {
                struct desktop_shell *shell;
                pixman_rectangle32_t area;

                shell = shell_surface_get_shell(shsurf);
                get_output_work_area(shell, shsurf->output, &area);

                width = area.width;
                height = area.height;
        } else {
                width = 0;
                height = 0;
        }

        shsurf->client->send_configure(shsurf->surface, width, height);
}

static void
shell_surface_state_changed(struct shell_surface *shsurf)
{
        if (shell_surface_is_xdg_surface(shsurf))
                send_configure_for_surface(shsurf);
}

static void
shell_grab_end(struct shell_grab *grab)
{
        if (grab->shsurf) {
                wl_list_remove(&grab->shsurf_destroy_listener.link);
                grab->shsurf->grabbed = 0;

                if (grab->shsurf->resize_edges) {
                        grab->shsurf->resize_edges = 0;
                        shell_surface_state_changed(grab->shsurf);
                }
        }

        weston_pointer_end_grab(grab->grab.pointer);
}

static void
shell_touch_grab_start(struct shell_touch_grab *grab,
                       const struct weston_touch_grab_interface *interface,
                       struct shell_surface *shsurf,
                       struct weston_touch *touch)
{
        struct desktop_shell *shell = shsurf->shell;

        touch_popup_grab_end(touch);
        if (touch->seat->pointer)
                popup_grab_end(touch->seat->pointer);

        grab->grab.interface = interface;
        grab->shsurf = shsurf;
        grab->shsurf_destroy_listener.notify = destroy_shell_grab_shsurf;
        wl_signal_add(&shsurf->destroy_signal,
                      &grab->shsurf_destroy_listener);

        grab->touch = touch;
        shsurf->grabbed = 1;

        weston_touch_start_grab(touch, &grab->grab);
        if (shell->child.desktop_shell)
                weston_touch_set_focus(touch->seat,
                                       get_default_view(shell->grab_surface));
}

static void
shell_touch_grab_end(struct shell_touch_grab *grab)
{
        if (grab->shsurf) {
                wl_list_remove(&grab->shsurf_destroy_listener.link);
                grab->shsurf->grabbed = 0;
        }

        weston_touch_end_grab(grab->touch);
}

static void
center_on_output(struct weston_view *view,
                 struct weston_output *output);

static enum weston_keyboard_modifier
get_modifier(char *modifier)
{
        if (!modifier)
                return MODIFIER_SUPER;

        if (!strcmp("ctrl", modifier))
                return MODIFIER_CTRL;
        else if (!strcmp("alt", modifier))
                return MODIFIER_ALT;
        else if (!strcmp("super", modifier))
                return MODIFIER_SUPER;
        else
                return MODIFIER_SUPER;
}

static enum animation_type
get_animation_type(char *animation)
{
        if (!animation)
                return ANIMATION_NONE;

        if (!strcmp("zoom", animation))
                return ANIMATION_ZOOM;
        else if (!strcmp("fade", animation))
                return ANIMATION_FADE;
        else if (!strcmp("dim-layer", animation))
                return ANIMATION_DIM_LAYER;
        else
                return ANIMATION_NONE;
}

static void
shell_configuration(struct desktop_shell *shell)
{
        struct weston_config_section *section;
        int duration;
        char *s, *client;

        section = weston_config_get_section(shell->compositor->config,
                                            "screensaver", NULL, NULL);
        weston_config_section_get_string(section,
                                         "path", &shell->screensaver.path, NULL);
        weston_config_section_get_int(section, "duration", &duration, 60);
        shell->screensaver.duration = duration * 1000;

        section = weston_config_get_section(shell->compositor->config,
                                            "shell", NULL, NULL);
        asprintf(&client, "%s/%s", weston_config_get_libexec_dir(),
                                   WESTON_SHELL_CLIENT);
        weston_config_section_get_string(section,
                                         "client", &s, client);
        free(client);
        shell->client = s;
        weston_config_section_get_string(section,
                                         "binding-modifier", &s, "super");
        shell->binding_modifier = get_modifier(s);
        free(s);

        weston_config_section_get_string(section,
                                         "exposay-modifier", &s, "none");
        if (strcmp(s, "none") == 0)
                shell->exposay_modifier = 0;
        else
                shell->exposay_modifier = get_modifier(s);
        free(s);

        weston_config_section_get_string(section, "animation", &s, "none");
        shell->win_animation_type = get_animation_type(s);
        free(s);
        weston_config_section_get_string(section, "close-animation", &s, "fade");
        shell->win_close_animation_type = get_animation_type(s);
        free(s);
        weston_config_section_get_string(section,
                                         "startup-animation", &s, "fade");
        shell->startup_animation_type = get_animation_type(s);
        free(s);
        if (shell->startup_animation_type == ANIMATION_ZOOM)
                shell->startup_animation_type = ANIMATION_NONE;
        weston_config_section_get_string(section, "focus-animation", &s, "none");
        shell->focus_animation_type = get_animation_type(s);
        free(s);
        weston_config_section_get_uint(section, "num-workspaces",
                                       &shell->workspaces.num,
                                       DEFAULT_NUM_WORKSPACES);
}

struct weston_output *
get_default_output(struct weston_compositor *compositor)
{
        return container_of(compositor->output_list.next,
                            struct weston_output, link);
}


/* no-op func for checking focus surface */
static void
focus_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy)
{
}

static struct focus_surface *
get_focus_surface(struct weston_surface *surface)
{
        if (surface->configure == focus_surface_configure)
                return surface->configure_private;
        else
                return NULL;
}

static bool
is_focus_surface (struct weston_surface *es)
{
        return (es->configure == focus_surface_configure);
}

static bool
is_focus_view (struct weston_view *view)
{
        return is_focus_surface (view->surface);
}

static struct focus_surface *
create_focus_surface(struct weston_compositor *ec,
                     struct weston_output *output)
{
        struct focus_surface *fsurf = NULL;
        struct weston_surface *surface = NULL;

        fsurf = malloc(sizeof *fsurf);
        if (!fsurf)
                return NULL;

        fsurf->surface = weston_surface_create(ec);
        surface = fsurf->surface;
        if (surface == NULL) {
                free(fsurf);
                return NULL;
        }

        surface->configure = focus_surface_configure;
        surface->output = output;
        surface->configure_private = fsurf;

        fsurf->view = weston_view_create(surface);
        if (fsurf->view == NULL) {
                weston_surface_destroy(surface);
                free(fsurf);
                return NULL;
        }
        fsurf->view->output = output;

        weston_surface_set_size(surface, output->width, output->height);
        weston_view_set_position(fsurf->view, output->x, output->y);
        weston_surface_set_color(surface, 0.0, 0.0, 0.0, 1.0);
        pixman_region32_fini(&surface->opaque);
        pixman_region32_init_rect(&surface->opaque, output->x, output->y,
                                  output->width, output->height);
        pixman_region32_fini(&surface->input);
        pixman_region32_init(&surface->input);

        wl_list_init(&fsurf->workspace_transform.link);

        return fsurf;
}

static void
focus_surface_destroy(struct focus_surface *fsurf)
{
        weston_surface_destroy(fsurf->surface);
        free(fsurf);
}

static void
focus_animation_done(struct weston_view_animation *animation, void *data)
{
        struct workspace *ws = data;

        ws->focus_animation = NULL;
}

static void
focus_state_destroy(struct focus_state *state)
{
        wl_list_remove(&state->seat_destroy_listener.link);
        wl_list_remove(&state->surface_destroy_listener.link);
        free(state);
}

static void
focus_state_seat_destroy(struct wl_listener *listener, void *data)
{
        struct focus_state *state = container_of(listener,
                                                 struct focus_state,
                                                 seat_destroy_listener);

        wl_list_remove(&state->link);
        focus_state_destroy(state);
}

static void
focus_state_surface_destroy(struct wl_listener *listener, void *data)
{
        struct focus_state *state = container_of(listener,
                                                 struct focus_state,
                                                 surface_destroy_listener);
        struct desktop_shell *shell;
        struct weston_surface *main_surface, *next;
        struct weston_view *view;

        main_surface = weston_surface_get_main_surface(state->keyboard_focus);

        next = NULL;
        wl_list_for_each(view,
                         &state->ws->layer.view_list.link, layer_link.link) {
                if (view->surface == main_surface)
                        continue;
                if (is_focus_view(view))
                        continue;

                next = view->surface;
                break;
        }

        /* if the focus was a sub-surface, activate its main surface */
        if (main_surface != state->keyboard_focus)
                next = main_surface;

        shell = state->seat->compositor->shell_interface.shell;
        if (next) {
                state->keyboard_focus = NULL;
                activate(shell, next, state->seat, true);
        } else {
                if (shell->focus_animation_type == ANIMATION_DIM_LAYER) {
                        if (state->ws->focus_animation)
                                weston_view_animation_destroy(state->ws->focus_animation);

                        state->ws->focus_animation = weston_fade_run(
                                state->ws->fsurf_front->view,
                                state->ws->fsurf_front->view->alpha, 0.0, 300,
                                focus_animation_done, state->ws);
                }

                wl_list_remove(&state->link);
                focus_state_destroy(state);
        }
}

static struct focus_state *
focus_state_create(struct weston_seat *seat, struct workspace *ws)
{
        struct focus_state *state;

        state = malloc(sizeof *state);
        if (state == NULL)
                return NULL;

        state->keyboard_focus = NULL;
        state->ws = ws;
        state->seat = seat;
        wl_list_insert(&ws->focus_list, &state->link);

        state->seat_destroy_listener.notify = focus_state_seat_destroy;
        state->surface_destroy_listener.notify = focus_state_surface_destroy;
        wl_signal_add(&seat->destroy_signal,
                      &state->seat_destroy_listener);
        wl_list_init(&state->surface_destroy_listener.link);

        return state;
}

static struct focus_state *
ensure_focus_state(struct desktop_shell *shell, struct weston_seat *seat)
{
        struct workspace *ws = get_current_workspace(shell);
        struct focus_state *state;

        wl_list_for_each(state, &ws->focus_list, link)
                if (state->seat == seat)
                        break;

        if (&state->link == &ws->focus_list)
                state = focus_state_create(seat, ws);

        return state;
}

static void
focus_state_set_focus(struct focus_state *state,
                      struct weston_surface *surface)
{
        if (state->keyboard_focus) {
                wl_list_remove(&state->surface_destroy_listener.link);
                wl_list_init(&state->surface_destroy_listener.link);
        }

        state->keyboard_focus = surface;
        if (surface)
                wl_signal_add(&surface->destroy_signal,
                              &state->surface_destroy_listener);
}

static void
restore_focus_state(struct desktop_shell *shell, struct workspace *ws)
{
        struct focus_state *state, *next;
        struct weston_surface *surface;
        struct wl_list pending_seat_list;
        struct weston_seat *seat, *next_seat;

        /* Temporarily steal the list of seats so that we can keep
         * track of the seats we've already processed */
        wl_list_init(&pending_seat_list);
        wl_list_insert_list(&pending_seat_list, &shell->compositor->seat_list);
        wl_list_init(&shell->compositor->seat_list);

        wl_list_for_each_safe(state, next, &ws->focus_list, link) {
                wl_list_remove(&state->seat->link);
                wl_list_insert(&shell->compositor->seat_list,
                               &state->seat->link);

                if (state->seat->keyboard == NULL)
                        continue;

                surface = state->keyboard_focus;

                weston_keyboard_set_focus(state->seat->keyboard, surface);
        }

        /* For any remaining seats that we don't have a focus state
         * for we'll reset the keyboard focus to NULL */
        wl_list_for_each_safe(seat, next_seat, &pending_seat_list, link) {
                wl_list_insert(&shell->compositor->seat_list, &seat->link);

                if (seat->keyboard == NULL)
                        continue;

                weston_keyboard_set_focus(seat->keyboard, NULL);
        }
}

static void
replace_focus_state(struct desktop_shell *shell, struct workspace *ws,
                    struct weston_seat *seat)
{
        struct focus_state *state;

        wl_list_for_each(state, &ws->focus_list, link) {
                if (state->seat == seat) {
                        focus_state_set_focus(state, seat->keyboard->focus);
                        return;
                }
        }
}

static void
drop_focus_state(struct desktop_shell *shell, struct workspace *ws,
                 struct weston_surface *surface)
{
        struct focus_state *state;

        wl_list_for_each(state, &ws->focus_list, link)
                if (state->keyboard_focus == surface)
                        focus_state_set_focus(state, NULL);
}

static void
animate_focus_change(struct desktop_shell *shell, struct workspace *ws,
                     struct weston_view *from, struct weston_view *to)
{
        struct weston_output *output;
        bool focus_surface_created = false;

        /* FIXME: Only support dim animation using two layers */
        if (from == to || shell->focus_animation_type != ANIMATION_DIM_LAYER)
                return;

        output = get_default_output(shell->compositor);
        if (ws->fsurf_front == NULL && (from || to)) {
                ws->fsurf_front = create_focus_surface(shell->compositor, output);
                if (ws->fsurf_front == NULL)
                        return;
                ws->fsurf_front->view->alpha = 0.0;

                ws->fsurf_back = create_focus_surface(shell->compositor, output);
                if (ws->fsurf_back == NULL) {
                        focus_surface_destroy(ws->fsurf_front);
                        return;
                }
                ws->fsurf_back->view->alpha = 0.0;

                focus_surface_created = true;
        } else {
                weston_layer_entry_remove(&ws->fsurf_front->view->layer_link);
                weston_layer_entry_remove(&ws->fsurf_back->view->layer_link);
        }

        if (ws->focus_animation) {
                weston_view_animation_destroy(ws->focus_animation);
                ws->focus_animation = NULL;
        }

        if (to)
                weston_layer_entry_insert(&to->layer_link,
                                          &ws->fsurf_front->view->layer_link);
        else if (from)
                weston_layer_entry_insert(&ws->layer.view_list,
                                          &ws->fsurf_front->view->layer_link);

        if (focus_surface_created) {
                ws->focus_animation = weston_fade_run(
                        ws->fsurf_front->view,
                        ws->fsurf_front->view->alpha, 0.4, 300,
                        focus_animation_done, ws);
        } else if (from) {
                weston_layer_entry_insert(&from->layer_link,
                                          &ws->fsurf_back->view->layer_link);
                ws->focus_animation = weston_stable_fade_run(
                        ws->fsurf_front->view, 0.0,
                        ws->fsurf_back->view, 0.4,
                        focus_animation_done, ws);
        } else if (to) {
                weston_layer_entry_insert(&ws->layer.view_list,
                                          &ws->fsurf_back->view->layer_link);
                ws->focus_animation = weston_stable_fade_run(
                        ws->fsurf_front->view, 0.0,
                        ws->fsurf_back->view, 0.4,
                        focus_animation_done, ws);
        }
}

static void
workspace_destroy(struct workspace *ws)
{
        struct focus_state *state, *next;

        wl_list_for_each_safe(state, next, &ws->focus_list, link)
                focus_state_destroy(state);

        if (ws->fsurf_front)
                focus_surface_destroy(ws->fsurf_front);
        if (ws->fsurf_back)
                focus_surface_destroy(ws->fsurf_back);

        free(ws);
}

static void
seat_destroyed(struct wl_listener *listener, void *data)
{
        struct weston_seat *seat = data;
        struct focus_state *state, *next;
        struct workspace *ws = container_of(listener,
                                            struct workspace,
                                            seat_destroyed_listener);

        wl_list_for_each_safe(state, next, &ws->focus_list, link)
                if (state->seat == seat)
                        wl_list_remove(&state->link);
}

static struct workspace *
workspace_create(void)
{
        struct workspace *ws = malloc(sizeof *ws);
        if (ws == NULL)
                return NULL;

        weston_layer_init(&ws->layer, NULL);

        wl_list_init(&ws->focus_list);
        wl_list_init(&ws->seat_destroyed_listener.link);
        ws->seat_destroyed_listener.notify = seat_destroyed;
        ws->fsurf_front = NULL;
        ws->fsurf_back = NULL;
        ws->focus_animation = NULL;

        return ws;
}

static int
workspace_is_empty(struct workspace *ws)
{
        return wl_list_empty(&ws->layer.view_list.link);
}

static struct workspace *
get_workspace(struct desktop_shell *shell, unsigned int index)
{
        struct workspace **pws = shell->workspaces.array.data;
        assert(index < shell->workspaces.num);
        pws += index;
        return *pws;
}

struct workspace *
get_current_workspace(struct desktop_shell *shell)
{
        return get_workspace(shell, shell->workspaces.current);
}

static void
activate_workspace(struct desktop_shell *shell, unsigned int index)
{
        struct workspace *ws;

        ws = get_workspace(shell, index);
        wl_list_insert(&shell->panel_layer.link, &ws->layer.link);

        shell->workspaces.current = index;
}

static unsigned int
get_output_height(struct weston_output *output)
{
        return abs(output->region.extents.y1 - output->region.extents.y2);
}

static void
view_translate(struct workspace *ws, struct weston_view *view, double d)
{
        struct weston_transform *transform;

        if (is_focus_view(view)) {
                struct focus_surface *fsurf = get_focus_surface(view->surface);
                transform = &fsurf->workspace_transform;
        } else {
                struct shell_surface *shsurf = get_shell_surface(view->surface);
                transform = &shsurf->workspace_transform;
        }

        if (wl_list_empty(&transform->link))
                wl_list_insert(view->geometry.transformation_list.prev,
                               &transform->link);

        weston_matrix_init(&transform->matrix);
        weston_matrix_translate(&transform->matrix,
                                0.0, d, 0.0);
        weston_view_geometry_dirty(view);
}

static void
workspace_translate_out(struct workspace *ws, double fraction)
{
        struct weston_view *view;
        unsigned int height;
        double d;

        wl_list_for_each(view, &ws->layer.view_list.link, layer_link.link) {
                height = get_output_height(view->surface->output);
                d = height * fraction;

                view_translate(ws, view, d);
        }
}

static void
workspace_translate_in(struct workspace *ws, double fraction)
{
        struct weston_view *view;
        unsigned int height;
        double d;

        wl_list_for_each(view, &ws->layer.view_list.link, layer_link.link) {
                height = get_output_height(view->surface->output);

                if (fraction > 0)
                        d = -(height - height * fraction);
                else
                        d = height + height * fraction;

                view_translate(ws, view, d);
        }
}

static void
broadcast_current_workspace_state(struct desktop_shell *shell)
{
        struct wl_resource *resource;

        wl_resource_for_each(resource, &shell->workspaces.client_list)
                workspace_manager_send_state(resource,
                                             shell->workspaces.current,
                                             shell->workspaces.num);
}

static void
reverse_workspace_change_animation(struct desktop_shell *shell,
                                   unsigned int index,
                                   struct workspace *from,
                                   struct workspace *to)
{
        shell->workspaces.current = index;

        shell->workspaces.anim_to = to;
        shell->workspaces.anim_from = from;
        shell->workspaces.anim_dir = -1 * shell->workspaces.anim_dir;
        shell->workspaces.anim_timestamp = 0;

        weston_compositor_schedule_repaint(shell->compositor);
}

static void
workspace_deactivate_transforms(struct workspace *ws)
{
        struct weston_view *view;
        struct weston_transform *transform;

        wl_list_for_each(view, &ws->layer.view_list.link, layer_link.link) {
                if (is_focus_view(view)) {
                        struct focus_surface *fsurf = get_focus_surface(view->surface);
                        transform = &fsurf->workspace_transform;
                } else {
                        struct shell_surface *shsurf = get_shell_surface(view->surface);
                        transform = &shsurf->workspace_transform;
                }

                if (!wl_list_empty(&transform->link)) {
                        wl_list_remove(&transform->link);
                        wl_list_init(&transform->link);
                }
                weston_view_geometry_dirty(view);
        }
}

static void
finish_workspace_change_animation(struct desktop_shell *shell,
                                  struct workspace *from,
                                  struct workspace *to)
{
        struct weston_view *view;

        weston_compositor_schedule_repaint(shell->compositor);

        /* Views that extend past the bottom of the output are still
         * visible after the workspace animation ends but before its layer
         * is hidden. In that case, we need to damage below those views so
         * that the screen is properly repainted. */
        wl_list_for_each(view, &from->layer.view_list.link, layer_link.link)
                weston_view_damage_below(view);

        wl_list_remove(&shell->workspaces.animation.link);
        workspace_deactivate_transforms(from);
        workspace_deactivate_transforms(to);
        shell->workspaces.anim_to = NULL;

        wl_list_remove(&shell->workspaces.anim_from->layer.link);
}

static void
animate_workspace_change_frame(struct weston_animation *animation,
                               struct weston_output *output, uint32_t msecs)
{
        struct desktop_shell *shell =
                container_of(animation, struct desktop_shell,
                             workspaces.animation);
        struct workspace *from = shell->workspaces.anim_from;
        struct workspace *to = shell->workspaces.anim_to;
        uint32_t t;
        double x, y;

        if (workspace_is_empty(from) && workspace_is_empty(to)) {
                finish_workspace_change_animation(shell, from, to);
                return;
        }

        if (shell->workspaces.anim_timestamp == 0) {
                if (shell->workspaces.anim_current == 0.0)
                        shell->workspaces.anim_timestamp = msecs;
                else
                        shell->workspaces.anim_timestamp =
                                msecs -
                                /* Invers of movement function 'y' below. */
                                (asin(1.0 - shell->workspaces.anim_current) *
                                 DEFAULT_WORKSPACE_CHANGE_ANIMATION_LENGTH *
                                 M_2_PI);
        }

        t = msecs - shell->workspaces.anim_timestamp;

        /*
         * x = [0, π/2]
         * y(x) = sin(x)
         */
        x = t * (1.0/DEFAULT_WORKSPACE_CHANGE_ANIMATION_LENGTH) * M_PI_2;
        y = sin(x);

        if (t < DEFAULT_WORKSPACE_CHANGE_ANIMATION_LENGTH) {
                weston_compositor_schedule_repaint(shell->compositor);

                workspace_translate_out(from, shell->workspaces.anim_dir * y);
                workspace_translate_in(to, shell->workspaces.anim_dir * y);
                shell->workspaces.anim_current = y;

                weston_compositor_schedule_repaint(shell->compositor);
        }
        else
                finish_workspace_change_animation(shell, from, to);
}

static void
animate_workspace_change(struct desktop_shell *shell,
                         unsigned int index,
                         struct workspace *from,
                         struct workspace *to)
{
        struct weston_output *output;

        int dir;

        if (index > shell->workspaces.current)
                dir = -1;
        else
                dir = 1;

        shell->workspaces.current = index;

        shell->workspaces.anim_dir = dir;
        shell->workspaces.anim_from = from;
        shell->workspaces.anim_to = to;
        shell->workspaces.anim_current = 0.0;
        shell->workspaces.anim_timestamp = 0;

        output = container_of(shell->compositor->output_list.next,
                              struct weston_output, link);
        wl_list_insert(&output->animation_list,
                       &shell->workspaces.animation.link);

        wl_list_insert(from->layer.link.prev, &to->layer.link);

        workspace_translate_in(to, 0);

        restore_focus_state(shell, to);

        weston_compositor_schedule_repaint(shell->compositor);
}

static void
update_workspace(struct desktop_shell *shell, unsigned int index,
                 struct workspace *from, struct workspace *to)
{
        shell->workspaces.current = index;
        wl_list_insert(&from->layer.link, &to->layer.link);
        wl_list_remove(&from->layer.link);
}

static void
change_workspace(struct desktop_shell *shell, unsigned int index)
{
        struct workspace *from;
        struct workspace *to;
        struct focus_state *state;

        if (index == shell->workspaces.current)
                return;

        /* Don't change workspace when there is any fullscreen surfaces. */
        if (!wl_list_empty(&shell->fullscreen_layer.view_list.link))
                return;

        from = get_current_workspace(shell);
        to = get_workspace(shell, index);

        if (shell->workspaces.anim_from == to &&
            shell->workspaces.anim_to == from) {
                restore_focus_state(shell, to);
                reverse_workspace_change_animation(shell, index, from, to);
                broadcast_current_workspace_state(shell);
                return;
        }

        if (shell->workspaces.anim_to != NULL)
                finish_workspace_change_animation(shell,
                                                  shell->workspaces.anim_from,
                                                  shell->workspaces.anim_to);

        restore_focus_state(shell, to);

        if (shell->focus_animation_type != ANIMATION_NONE) {
                wl_list_for_each(state, &from->focus_list, link)
                        if (state->keyboard_focus)
                                animate_focus_change(shell, from,
                                                     get_default_view(state->keyboard_focus), NULL);

                wl_list_for_each(state, &to->focus_list, link)
                        if (state->keyboard_focus)
                                animate_focus_change(shell, to,
                                                     NULL, get_default_view(state->keyboard_focus));
        }

        if (workspace_is_empty(to) && workspace_is_empty(from))
                update_workspace(shell, index, from, to);
        else
                animate_workspace_change(shell, index, from, to);

        broadcast_current_workspace_state(shell);
}

static bool
workspace_has_only(struct workspace *ws, struct weston_surface *surface)
{
        struct wl_list *list = &ws->layer.view_list.link;
        struct wl_list *e;

        if (wl_list_empty(list))
                return false;

        e = list->next;

        if (e->next != list)
                return false;

        return container_of(e, struct weston_view, layer_link.link)->surface == surface;
}

static void
move_surface_to_workspace(struct desktop_shell *shell,
                          struct shell_surface *shsurf,
                          uint32_t workspace)
{
        struct workspace *from;
        struct workspace *to;
        struct weston_seat *seat;
        struct weston_surface *focus;
        struct weston_view *view;

        if (workspace == shell->workspaces.current)
                return;

        view = get_default_view(shsurf->surface);
        if (!view)
                return;

        assert(weston_surface_get_main_surface(view->surface) == view->surface);

        if (workspace >= shell->workspaces.num)
                workspace = shell->workspaces.num - 1;

        from = get_current_workspace(shell);
        to = get_workspace(shell, workspace);

        weston_layer_entry_remove(&view->layer_link);
        weston_layer_entry_insert(&to->layer.view_list, &view->layer_link);

        shell_surface_update_child_surface_layers(shsurf);

        drop_focus_state(shell, from, view->surface);
        wl_list_for_each(seat, &shell->compositor->seat_list, link) {
                if (!seat->keyboard)
                        continue;

                focus = weston_surface_get_main_surface(seat->keyboard->focus);
                if (focus == view->surface)
                        weston_keyboard_set_focus(seat->keyboard, NULL);
        }

        weston_view_damage_below(view);
}

static void
take_surface_to_workspace_by_seat(struct desktop_shell *shell,
                                  struct weston_seat *seat,
                                  unsigned int index)
{
        struct weston_surface *surface;
        struct weston_view *view;
        struct shell_surface *shsurf;
        struct workspace *from;
        struct workspace *to;
        struct focus_state *state;

        surface = weston_surface_get_main_surface(seat->keyboard->focus);
        view = get_default_view(surface);
        if (view == NULL ||
            index == shell->workspaces.current ||
            is_focus_view(view))
                return;

        from = get_current_workspace(shell);
        to = get_workspace(shell, index);

        weston_layer_entry_remove(&view->layer_link);
        weston_layer_entry_insert(&to->layer.view_list, &view->layer_link);

        shsurf = get_shell_surface(surface);
        if (shsurf != NULL)
                shell_surface_update_child_surface_layers(shsurf);

        replace_focus_state(shell, to, seat);
        drop_focus_state(shell, from, surface);

        if (shell->workspaces.anim_from == to &&
            shell->workspaces.anim_to == from) {
                wl_list_remove(&to->layer.link);
                wl_list_insert(from->layer.link.prev, &to->layer.link);

                reverse_workspace_change_animation(shell, index, from, to);
                broadcast_current_workspace_state(shell);

                return;
        }

        if (shell->workspaces.anim_to != NULL)
                finish_workspace_change_animation(shell,
                                                  shell->workspaces.anim_from,
                                                  shell->workspaces.anim_to);

        if (workspace_is_empty(from) &&
            workspace_has_only(to, surface))
                update_workspace(shell, index, from, to);
        else {
                if (shsurf != NULL &&
                    wl_list_empty(&shsurf->workspace_transform.link))
                        wl_list_insert(&shell->workspaces.anim_sticky_list,
                                       &shsurf->workspace_transform.link);

                animate_workspace_change(shell, index, from, to);
        }

        broadcast_current_workspace_state(shell);

        state = ensure_focus_state(shell, seat);
        if (state != NULL)
                focus_state_set_focus(state, surface);
}

static void
workspace_manager_move_surface(struct wl_client *client,
                               struct wl_resource *resource,
                               struct wl_resource *surface_resource,
                               uint32_t workspace)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct weston_surface *main_surface;
        struct shell_surface *shell_surface;

        main_surface = weston_surface_get_main_surface(surface);
        shell_surface = get_shell_surface(main_surface);
        if (shell_surface == NULL)
                return;

        move_surface_to_workspace(shell, shell_surface, workspace);
}

static const struct workspace_manager_interface workspace_manager_implementation = {
        workspace_manager_move_surface,
};

static void
unbind_resource(struct wl_resource *resource)
{
        wl_list_remove(wl_resource_get_link(resource));
}

static void
bind_workspace_manager(struct wl_client *client,
                       void *data, uint32_t version, uint32_t id)
{
        struct desktop_shell *shell = data;
        struct wl_resource *resource;

        resource = wl_resource_create(client,
                                      &workspace_manager_interface, 1, id);

        if (resource == NULL) {
                weston_log("couldn't add workspace manager object");
                return;
        }

        wl_resource_set_implementation(resource,
                                       &workspace_manager_implementation,
                                       shell, unbind_resource);
        wl_list_insert(&shell->workspaces.client_list,
                       wl_resource_get_link(resource));

        workspace_manager_send_state(resource,
                                     shell->workspaces.current,
                                     shell->workspaces.num);
}

static void
touch_move_grab_down(struct weston_touch_grab *grab, uint32_t time,
                     int touch_id, wl_fixed_t sx, wl_fixed_t sy)
{
}

static void
touch_move_grab_up(struct weston_touch_grab *grab, uint32_t time, int touch_id)
{
        struct weston_touch_move_grab *move =
                (struct weston_touch_move_grab *) container_of(
                        grab, struct shell_touch_grab, grab);

        if (touch_id == 0)
                move->active = 0;

        if (grab->touch->num_tp == 0) {
                shell_touch_grab_end(&move->base);
                free(move);
        }
}

static void
touch_move_grab_motion(struct weston_touch_grab *grab, uint32_t time,
                       int touch_id, wl_fixed_t sx, wl_fixed_t sy)
{
        struct weston_touch_move_grab *move = (struct weston_touch_move_grab *) grab;
        struct shell_surface *shsurf = move->base.shsurf;
        struct weston_surface *es;
        int dx = wl_fixed_to_int(grab->touch->grab_x + move->dx);
        int dy = wl_fixed_to_int(grab->touch->grab_y + move->dy);

        if (!shsurf || !move->active)
                return;

        es = shsurf->surface;

        weston_view_set_position(shsurf->view, dx, dy);

        weston_compositor_schedule_repaint(es->compositor);
}

static void
touch_move_grab_frame(struct weston_touch_grab *grab)
{
}

static void
touch_move_grab_cancel(struct weston_touch_grab *grab)
{
        struct weston_touch_move_grab *move =
                (struct weston_touch_move_grab *) container_of(
                        grab, struct shell_touch_grab, grab);

        shell_touch_grab_end(&move->base);
        free(move);
}

static const struct weston_touch_grab_interface touch_move_grab_interface = {
        touch_move_grab_down,
        touch_move_grab_up,
        touch_move_grab_motion,
        touch_move_grab_frame,
        touch_move_grab_cancel,
};

static int
surface_touch_move(struct shell_surface *shsurf, struct weston_seat *seat)
{
        struct weston_touch_move_grab *move;

        if (!shsurf)
                return -1;

        if (shsurf->state.fullscreen || shsurf->state.maximized)
                return 0;

        move = malloc(sizeof *move);
        if (!move)
                return -1;

        move->active = 1;
        move->dx = wl_fixed_from_double(shsurf->view->geometry.x) -
                        seat->touch->grab_x;
        move->dy = wl_fixed_from_double(shsurf->view->geometry.y) -
                        seat->touch->grab_y;

        shell_touch_grab_start(&move->base, &touch_move_grab_interface, shsurf,
                               seat->touch);

        return 0;
}

static void
noop_grab_focus(struct weston_pointer_grab *grab)
{
}

static void
constrain_position(struct weston_move_grab *move, int *cx, int *cy)
{
        struct shell_surface *shsurf = move->base.shsurf;
        struct weston_pointer *pointer = move->base.grab.pointer;
        int x, y, panel_width, panel_height, bottom;
        const int safety = 50;

        x = wl_fixed_to_int(pointer->x + move->dx);
        y = wl_fixed_to_int(pointer->y + move->dy);

        if (shsurf->shell->panel_position == DESKTOP_SHELL_PANEL_POSITION_TOP) {
                get_output_panel_size(shsurf->shell, shsurf->surface->output,
                                      &panel_width, &panel_height);

                bottom = y + shsurf->geometry.height;
                if (bottom - panel_height < safety)
                        y = panel_height + safety -
                                shsurf->geometry.height;

                if (move->client_initiated &&
                    y + shsurf->geometry.y < panel_height)
                        y = panel_height - shsurf->geometry.y;
        }

        *cx = x;
        *cy = y;
}

static void
move_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
                 wl_fixed_t x, wl_fixed_t y)
{
        struct weston_move_grab *move = (struct weston_move_grab *) grab;
        struct weston_pointer *pointer = grab->pointer;
        struct shell_surface *shsurf = move->base.shsurf;
        int cx, cy;

        weston_pointer_move(pointer, x, y);
        if (!shsurf)
                return;

        constrain_position(move, &cx, &cy);

        weston_view_set_position(shsurf->view, cx, cy);

        weston_compositor_schedule_repaint(shsurf->surface->compositor);
}

static void
move_grab_button(struct weston_pointer_grab *grab,
                 uint32_t time, uint32_t button, uint32_t state_w)
{
        struct shell_grab *shell_grab = container_of(grab, struct shell_grab,
                                                    grab);
        struct weston_pointer *pointer = grab->pointer;
        enum wl_pointer_button_state state = state_w;

        if (pointer->button_count == 0 &&
            state == WL_POINTER_BUTTON_STATE_RELEASED) {
                shell_grab_end(shell_grab);
                free(grab);
        }
}

static void
move_grab_cancel(struct weston_pointer_grab *grab)
{
        struct shell_grab *shell_grab =
                container_of(grab, struct shell_grab, grab);

        shell_grab_end(shell_grab);
        free(grab);
}

static const struct weston_pointer_grab_interface move_grab_interface = {
        noop_grab_focus,
        move_grab_motion,
        move_grab_button,
        move_grab_cancel,
};

static int
surface_move(struct shell_surface *shsurf, struct weston_seat *seat,
             int client_initiated)
{
        struct weston_move_grab *move;

        if (!shsurf)
                return -1;

        if (shsurf->grabbed ||
            shsurf->state.fullscreen || shsurf->state.maximized)
                return 0;

        move = malloc(sizeof *move);
        if (!move)
                return -1;

        move->dx = wl_fixed_from_double(shsurf->view->geometry.x) -
                        seat->pointer->grab_x;
        move->dy = wl_fixed_from_double(shsurf->view->geometry.y) -
                        seat->pointer->grab_y;
        move->client_initiated = client_initiated;

        shell_grab_start(&move->base, &move_grab_interface, shsurf,
                         seat->pointer, DESKTOP_SHELL_CURSOR_MOVE);

        return 0;
}

static void
common_surface_move(struct wl_resource *resource,
                    struct wl_resource *seat_resource, uint32_t serial)
{
        struct weston_seat *seat = wl_resource_get_user_data(seat_resource);
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_surface *surface;

        if (seat->pointer &&
            seat->pointer->focus &&
            seat->pointer->button_count > 0 &&
            seat->pointer->grab_serial == serial) {
                surface = weston_surface_get_main_surface(seat->pointer->focus->surface);
                if ((surface == shsurf->surface) &&
                    (surface_move(shsurf, seat, 1) < 0))
                        wl_resource_post_no_memory(resource);
        } else if (seat->touch &&
                   seat->touch->focus &&
                   seat->touch->grab_serial == serial) {
                surface = weston_surface_get_main_surface(seat->touch->focus->surface);
                if ((surface == shsurf->surface) &&
                    (surface_touch_move(shsurf, seat) < 0))
                        wl_resource_post_no_memory(resource);
        }
}

static void
shell_surface_move(struct wl_client *client, struct wl_resource *resource,
                   struct wl_resource *seat_resource, uint32_t serial)
{
        common_surface_move(resource, seat_resource, serial);
}

struct weston_resize_grab {
        struct shell_grab base;
        uint32_t edges;
        int32_t width, height;
};

static void
resize_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
                   wl_fixed_t x, wl_fixed_t y)
{
        struct weston_resize_grab *resize = (struct weston_resize_grab *) grab;
        struct weston_pointer *pointer = grab->pointer;
        struct shell_surface *shsurf = resize->base.shsurf;
        int32_t width, height;
        wl_fixed_t from_x, from_y;
        wl_fixed_t to_x, to_y;

        weston_pointer_move(pointer, x, y);

        if (!shsurf)
                return;

        weston_view_from_global_fixed(shsurf->view,
                                      pointer->grab_x, pointer->grab_y,
                                      &from_x, &from_y);
        weston_view_from_global_fixed(shsurf->view,
                                      pointer->x, pointer->y, &to_x, &to_y);

        width = resize->width;
        if (resize->edges & WL_SHELL_SURFACE_RESIZE_LEFT) {
                width += wl_fixed_to_int(from_x - to_x);
        } else if (resize->edges & WL_SHELL_SURFACE_RESIZE_RIGHT) {
                width += wl_fixed_to_int(to_x - from_x);
        }

        height = resize->height;
        if (resize->edges & WL_SHELL_SURFACE_RESIZE_TOP) {
                height += wl_fixed_to_int(from_y - to_y);
        } else if (resize->edges & WL_SHELL_SURFACE_RESIZE_BOTTOM) {
                height += wl_fixed_to_int(to_y - from_y);
        }

        shsurf->client->send_configure(shsurf->surface, width, height);
}

static void
send_configure(struct weston_surface *surface, int32_t width, int32_t height)
{
        struct shell_surface *shsurf = get_shell_surface(surface);

        assert(shsurf);

        if (shsurf->resource)
                wl_shell_surface_send_configure(shsurf->resource,
                                                shsurf->resize_edges,
                                                width, height);
}

static const struct weston_shell_client shell_client = {
        send_configure
};

static void
resize_grab_button(struct weston_pointer_grab *grab,
                   uint32_t time, uint32_t button, uint32_t state_w)
{
        struct weston_resize_grab *resize = (struct weston_resize_grab *) grab;
        struct weston_pointer *pointer = grab->pointer;
        enum wl_pointer_button_state state = state_w;

        if (pointer->button_count == 0 &&
            state == WL_POINTER_BUTTON_STATE_RELEASED) {
                shell_grab_end(&resize->base);
                free(grab);
        }
}

static void
resize_grab_cancel(struct weston_pointer_grab *grab)
{
        struct weston_resize_grab *resize = (struct weston_resize_grab *) grab;

        shell_grab_end(&resize->base);
        free(grab);
}

static const struct weston_pointer_grab_interface resize_grab_interface = {
        noop_grab_focus,
        resize_grab_motion,
        resize_grab_button,
        resize_grab_cancel,
};

/*
 * Returns the bounding box of a surface and all its sub-surfaces,
 * in the surface coordinates system. */
static void
surface_subsurfaces_boundingbox(struct weston_surface *surface, int32_t *x,
                                int32_t *y, int32_t *w, int32_t *h) {
        pixman_region32_t region;
        pixman_box32_t *box;
        struct weston_subsurface *subsurface;

        pixman_region32_init_rect(&region, 0, 0,
                                  surface->width,
                                  surface->height);

        wl_list_for_each(subsurface, &surface->subsurface_list, parent_link) {
                pixman_region32_union_rect(&region, &region,
                                           subsurface->position.x,
                                           subsurface->position.y,
                                           subsurface->surface->width,
                                           subsurface->surface->height);
        }

        box = pixman_region32_extents(&region);
        if (x)
                *x = box->x1;
        if (y)
                *y = box->y1;
        if (w)
                *w = box->x2 - box->x1;
        if (h)
                *h = box->y2 - box->y1;

        pixman_region32_fini(&region);
}

static int
surface_resize(struct shell_surface *shsurf,
               struct weston_seat *seat, uint32_t edges)
{
        struct weston_resize_grab *resize;
        const unsigned resize_topbottom =
                WL_SHELL_SURFACE_RESIZE_TOP | WL_SHELL_SURFACE_RESIZE_BOTTOM;
        const unsigned resize_leftright =
                WL_SHELL_SURFACE_RESIZE_LEFT | WL_SHELL_SURFACE_RESIZE_RIGHT;
        const unsigned resize_any = resize_topbottom | resize_leftright;

        if (shsurf->grabbed ||
            shsurf->state.fullscreen || shsurf->state.maximized)
                return 0;

        /* Check for invalid edge combinations. */
        if (edges == WL_SHELL_SURFACE_RESIZE_NONE || edges > resize_any ||
            (edges & resize_topbottom) == resize_topbottom ||
            (edges & resize_leftright) == resize_leftright)
                return 0;

        resize = malloc(sizeof *resize);
        if (!resize)
                return -1;

        resize->edges = edges;

        resize->width = shsurf->geometry.width;
        resize->height = shsurf->geometry.height;

        shsurf->resize_edges = edges;
        shell_surface_state_changed(shsurf);
        shell_grab_start(&resize->base, &resize_grab_interface, shsurf,
                         seat->pointer, edges);

        return 0;
}

static void
common_surface_resize(struct wl_resource *resource,
                      struct wl_resource *seat_resource, uint32_t serial,
                      uint32_t edges)
{
        struct weston_seat *seat = wl_resource_get_user_data(seat_resource);
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_surface *surface;

        if (seat->pointer == NULL ||
            seat->pointer->button_count == 0 ||
            seat->pointer->grab_serial != serial ||
            seat->pointer->focus == NULL)
                return;

        surface = weston_surface_get_main_surface(seat->pointer->focus->surface);
        if (surface != shsurf->surface)
                return;

        if (surface_resize(shsurf, seat, edges) < 0)
                wl_resource_post_no_memory(resource);
}

static void
shell_surface_resize(struct wl_client *client, struct wl_resource *resource,
                     struct wl_resource *seat_resource, uint32_t serial,
                     uint32_t edges)
{
        common_surface_resize(resource, seat_resource, serial, edges);
}

static void
busy_cursor_grab_focus(struct weston_pointer_grab *base)
{
        struct shell_grab *grab = (struct shell_grab *) base;
        struct weston_pointer *pointer = base->pointer;
        struct weston_view *view;
        wl_fixed_t sx, sy;

        view = weston_compositor_pick_view(pointer->seat->compositor,
                                           pointer->x, pointer->y,
                                           &sx, &sy);

        if (!grab->shsurf || grab->shsurf->surface != view->surface) {
                shell_grab_end(grab);
                free(grab);
        }
}

static void
busy_cursor_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
                        wl_fixed_t x, wl_fixed_t y)
{
        weston_pointer_move(grab->pointer, x, y);
}

static void
busy_cursor_grab_button(struct weston_pointer_grab *base,
                        uint32_t time, uint32_t button, uint32_t state)
{
        struct shell_grab *grab = (struct shell_grab *) base;
        struct shell_surface *shsurf = grab->shsurf;
        struct weston_seat *seat = grab->grab.pointer->seat;

        if (shsurf && button == BTN_LEFT && state) {
                activate(shsurf->shell, shsurf->surface, seat, true);
                surface_move(shsurf, seat, 0);
        } else if (shsurf && button == BTN_RIGHT && state) {
                activate(shsurf->shell, shsurf->surface, seat, true);
                surface_rotate(shsurf, seat);
        }
}

static void
busy_cursor_grab_cancel(struct weston_pointer_grab *base)
{
        struct shell_grab *grab = (struct shell_grab *) base;

        shell_grab_end(grab);
        free(grab);
}

static const struct weston_pointer_grab_interface busy_cursor_grab_interface = {
        busy_cursor_grab_focus,
        busy_cursor_grab_motion,
        busy_cursor_grab_button,
        busy_cursor_grab_cancel,
};

static void
set_busy_cursor(struct shell_surface *shsurf, struct weston_pointer *pointer)
{
        struct shell_grab *grab;

        if (pointer->grab->interface == &busy_cursor_grab_interface)
                return;

        grab = malloc(sizeof *grab);
        if (!grab)
                return;

        shell_grab_start(grab, &busy_cursor_grab_interface, shsurf, pointer,
                         DESKTOP_SHELL_CURSOR_BUSY);
        /* Mark the shsurf as ungrabbed so that button binding is able
         * to move it. */
        shsurf->grabbed = 0;
}

static void
end_busy_cursor(struct weston_compositor *compositor, struct wl_client *client)
{
        struct shell_grab *grab;
        struct weston_seat *seat;

        wl_list_for_each(seat, &compositor->seat_list, link) {
                if (seat->pointer == NULL)
                        continue;

                grab = (struct shell_grab *) seat->pointer->grab;
                if (grab->grab.interface == &busy_cursor_grab_interface &&
                    wl_resource_get_client(grab->shsurf->resource) == client) {
                        shell_grab_end(grab);
                        free(grab);
                }
        }
}

static void
handle_shell_client_destroy(struct wl_listener *listener, void *data);

static int
xdg_ping_timeout_handler(void *data)
{
        struct shell_client *sc = data;
        struct weston_seat *seat;
        struct shell_surface *shsurf;

        /* Client is not responding */
        sc->unresponsive = 1;
        wl_list_for_each(seat, &sc->shell->compositor->seat_list, link) {
                if (seat->pointer == NULL || seat->pointer->focus == NULL)
                        continue;
                if (seat->pointer->focus->surface->resource == NULL)
                        continue;
                
                shsurf = get_shell_surface(seat->pointer->focus->surface);
                if (shsurf &&
                    wl_resource_get_client(shsurf->resource) == sc->client)
                        set_busy_cursor(shsurf, seat->pointer);
        }

        return 1;
}

static void
handle_xdg_ping(struct shell_surface *shsurf, uint32_t serial)
{
        struct weston_compositor *compositor = shsurf->shell->compositor;
        struct shell_client *sc = shsurf->owner;
        struct wl_event_loop *loop;
        static const int ping_timeout = 200;

        if (sc->unresponsive) {
                xdg_ping_timeout_handler(sc);
                return;
        }

        sc->ping_serial = serial;
        loop = wl_display_get_event_loop(compositor->wl_display);
        if (sc->ping_timer == NULL)
                sc->ping_timer =
                        wl_event_loop_add_timer(loop,
                                                xdg_ping_timeout_handler, sc);
        if (sc->ping_timer == NULL)
                return;

        wl_event_source_timer_update(sc->ping_timer, ping_timeout);

        if (shell_surface_is_xdg_surface(shsurf) ||
            shell_surface_is_xdg_popup(shsurf))
                xdg_shell_send_ping(sc->resource, serial);
        else if (shell_surface_is_wl_shell_surface(shsurf))
                wl_shell_surface_send_ping(shsurf->resource, serial);
}

static void
ping_handler(struct weston_surface *surface, uint32_t serial)
{
        struct shell_surface *shsurf = get_shell_surface(surface);

        if (!shsurf)
                return;
        if (!shsurf->resource)
                return;
        if (shsurf->surface == shsurf->shell->grab_surface)
                return;

        handle_xdg_ping(shsurf, serial);
}

static void
handle_pointer_focus(struct wl_listener *listener, void *data)
{
        struct weston_pointer *pointer = data;
        struct weston_view *view = pointer->focus;
        struct weston_compositor *compositor;
        uint32_t serial;

        if (!view)
                return;

        compositor = view->surface->compositor;
        serial = wl_display_next_serial(compositor->wl_display);
        ping_handler(view->surface, serial);
}

static void
shell_surface_lose_keyboard_focus(struct shell_surface *shsurf)
{
        if (--shsurf->focus_count == 0)
                shell_surface_state_changed(shsurf);
}

static void
shell_surface_gain_keyboard_focus(struct shell_surface *shsurf)
{
        if (shsurf->focus_count++ == 0)
                shell_surface_state_changed(shsurf);
}

static void
handle_keyboard_focus(struct wl_listener *listener, void *data)
{
        struct weston_keyboard *keyboard = data;
        struct shell_seat *seat = get_shell_seat(keyboard->seat);

        if (seat->focused_surface) {
                struct shell_surface *shsurf = get_shell_surface(seat->focused_surface);
                if (shsurf)
                        shell_surface_lose_keyboard_focus(shsurf);
        }

        seat->focused_surface = keyboard->focus;

        if (seat->focused_surface) {
                struct shell_surface *shsurf = get_shell_surface(seat->focused_surface);
                if (shsurf)
                        shell_surface_gain_keyboard_focus(shsurf);
        }
}

static void
shell_client_pong(struct shell_client *sc, uint32_t serial)
{
        if (sc->ping_serial != serial)
                return;

        sc->unresponsive = 0;
        end_busy_cursor(sc->shell->compositor, sc->client);

        if (sc->ping_timer) {
                wl_event_source_remove(sc->ping_timer);
                sc->ping_timer = NULL;
        }

}

static void
shell_surface_pong(struct wl_client *client,
                   struct wl_resource *resource, uint32_t serial)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct shell_client *sc = shsurf->owner;

        shell_client_pong(sc, serial);
}

static void
set_title(struct shell_surface *shsurf, const char *title)
{
        free(shsurf->title);
        shsurf->title = strdup(title);
}

static void
set_window_geometry(struct shell_surface *shsurf,
                    int32_t x, int32_t y, int32_t width, int32_t height)
{
        shsurf->next_geometry.x = x;
        shsurf->next_geometry.y = y;
        shsurf->next_geometry.width = width;
        shsurf->next_geometry.height = height;
        shsurf->has_next_geometry = true;
}

static void
shell_surface_set_title(struct wl_client *client,
                        struct wl_resource *resource, const char *title)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        set_title(shsurf, title);
}

static void
shell_surface_set_class(struct wl_client *client,
                        struct wl_resource *resource, const char *class)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        free(shsurf->class);
        shsurf->class = strdup(class);
}

static void
restore_output_mode(struct weston_output *output)
{
        if (output->current_mode != output->original_mode ||
            (int32_t)output->current_scale != output->original_scale)
                weston_output_switch_mode(output,
                                          output->original_mode,
                                          output->original_scale,
                                          WESTON_MODE_SWITCH_RESTORE_NATIVE);
}

static void
restore_all_output_modes(struct weston_compositor *compositor)
{
        struct weston_output *output;

        wl_list_for_each(output, &compositor->output_list, link)
                restore_output_mode(output);
}

/* The surface will be inserted into the list immediately after the link
 * returned by this function (i.e. will be stacked immediately above the
 * returned link). */
static struct weston_layer_entry *
shell_surface_calculate_layer_link (struct shell_surface *shsurf)
{
        struct workspace *ws;
        struct weston_view *parent;

        switch (shsurf->type) {
        case SHELL_SURFACE_XWAYLAND:
                return &shsurf->shell->fullscreen_layer.view_list;

        case SHELL_SURFACE_NONE:
                return NULL;

        case SHELL_SURFACE_POPUP:
        case SHELL_SURFACE_TOPLEVEL:
                if (shsurf->state.fullscreen && !shsurf->state.lowered) {
                        return &shsurf->shell->fullscreen_layer.view_list;
                } else if (shsurf->parent) {
                        /* Move the surface to its parent layer so
                         * that surfaces which are transient for
                         * fullscreen surfaces don't get hidden by the
                         * fullscreen surfaces. */

                        /* TODO: Handle a parent with multiple views */
                        parent = get_default_view(shsurf->parent);
                        if (parent)
                                return container_of(parent->layer_link.link.prev,
                                                    struct weston_layer_entry, link);
                }

                /* Move the surface to a normal workspace layer so that surfaces
                 * which were previously fullscreen or transient are no longer
                 * rendered on top. */
                ws = get_current_workspace(shsurf->shell);
                return &ws->layer.view_list;
        }

        assert(0 && "Unknown shell surface type");
}

static void
shell_surface_update_child_surface_layers (struct shell_surface *shsurf)
{
        struct shell_surface *child;
        struct weston_layer_entry *prev;

        /* Move the child layers to the same workspace as shsurf. They will be
         * stacked above shsurf. */
        wl_list_for_each_reverse(child, &shsurf->children_list, children_link) {
                if (shsurf->view->layer_link.link.prev != &child->view->layer_link.link) {
                        weston_view_damage_below(child->view);
                        weston_view_geometry_dirty(child->view);
                        prev = container_of(shsurf->view->layer_link.link.prev,
                                            struct weston_layer_entry, link);
                        weston_layer_entry_remove(&child->view->layer_link);
                        weston_layer_entry_insert(prev,
                                                  &child->view->layer_link);
                        weston_view_geometry_dirty(child->view);
                        weston_surface_damage(child->surface);

                        /* Recurse. We don’t expect this to recurse very far (if
                         * at all) because that would imply we have transient
                         * (or popup) children of transient surfaces, which
                         * would be unusual. */
                        shell_surface_update_child_surface_layers(child);
                }
        }
}

/* Update the surface’s layer. Mark both the old and new views as having dirty
 * geometry to ensure the changes are redrawn.
 *
 * If any child surfaces exist and are mapped, ensure they’re in the same layer
 * as this surface. */
static void
shell_surface_update_layer(struct shell_surface *shsurf)
{
        struct weston_layer_entry *new_layer_link;

        new_layer_link = shell_surface_calculate_layer_link(shsurf);

        if (new_layer_link == NULL)
                return;
        if (new_layer_link == &shsurf->view->layer_link)
                return;

        weston_view_geometry_dirty(shsurf->view);
        weston_layer_entry_remove(&shsurf->view->layer_link);
        weston_layer_entry_insert(new_layer_link, &shsurf->view->layer_link);
        weston_view_geometry_dirty(shsurf->view);
        weston_surface_damage(shsurf->surface);

        shell_surface_update_child_surface_layers(shsurf);
}

static void
shell_surface_set_parent(struct shell_surface *shsurf,
                         struct weston_surface *parent)
{
        shsurf->parent = parent;

        wl_list_remove(&shsurf->children_link);
        wl_list_init(&shsurf->children_link);

        /* Insert into the parent surface’s child list. */
        if (parent != NULL) {
                struct shell_surface *parent_shsurf = get_shell_surface(parent);
                if (parent_shsurf != NULL)
                        wl_list_insert(&parent_shsurf->children_list,
                                       &shsurf->children_link);
        }
}

static void
shell_surface_set_output(struct shell_surface *shsurf,
                         struct weston_output *output)
{
        struct weston_surface *es = shsurf->surface;

        /* get the default output, if the client set it as NULL
           check whether the ouput is available */
        if (output)
                shsurf->output = output;
        else if (es->output)
                shsurf->output = es->output;
        else
                shsurf->output = get_default_output(es->compositor);
}

static void
surface_clear_next_states(struct shell_surface *shsurf)
{
        shsurf->next_state.maximized = false;
        shsurf->next_state.fullscreen = false;

        if ((shsurf->next_state.maximized != shsurf->state.maximized) ||
            (shsurf->next_state.fullscreen != shsurf->state.fullscreen))
                shsurf->state_changed = true;
}

static void
set_toplevel(struct shell_surface *shsurf)
{
        shell_surface_set_parent(shsurf, NULL);
        surface_clear_next_states(shsurf);
        shsurf->type = SHELL_SURFACE_TOPLEVEL;

        /* The layer_link is updated in set_surface_type(),
         * called from configure. */
}

static void
shell_surface_set_toplevel(struct wl_client *client,
                           struct wl_resource *resource)
{
        struct shell_surface *surface = wl_resource_get_user_data(resource);

        set_toplevel(surface);
}

static void
set_transient(struct shell_surface *shsurf,
              struct weston_surface *parent, int x, int y, uint32_t flags)
{
        assert(parent != NULL);

        shell_surface_set_parent(shsurf, parent);

        surface_clear_next_states(shsurf);

        shsurf->transient.x = x;
        shsurf->transient.y = y;
        shsurf->transient.flags = flags;

        shsurf->next_state.relative = true;
        shsurf->state_changed = true;
        shsurf->type = SHELL_SURFACE_TOPLEVEL;

        /* The layer_link is updated in set_surface_type(),
         * called from configure. */
}

static void
shell_surface_set_transient(struct wl_client *client,
                            struct wl_resource *resource,
                            struct wl_resource *parent_resource,
                            int x, int y, uint32_t flags)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_surface *parent =
                wl_resource_get_user_data(parent_resource);

        set_transient(shsurf, parent, x, y, flags);
}

static void
set_fullscreen(struct shell_surface *shsurf,
               uint32_t method,
               uint32_t framerate,
               struct weston_output *output)
{
        shell_surface_set_output(shsurf, output);
        shsurf->type = SHELL_SURFACE_TOPLEVEL;

        shsurf->fullscreen_output = shsurf->output;
        shsurf->fullscreen.type = method;
        shsurf->fullscreen.framerate = framerate;

        send_configure_for_surface(shsurf);
}

static void
weston_view_set_initial_position(struct weston_view *view,
                                 struct desktop_shell *shell);

static void
unset_fullscreen(struct shell_surface *shsurf)
{
        /* Unset the fullscreen output, driver configuration and transforms. */
        if (shsurf->fullscreen.type == WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER &&
            shell_surface_is_top_fullscreen(shsurf)) {
                restore_output_mode(shsurf->fullscreen_output);
        }

        shsurf->fullscreen.type = WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT;
        shsurf->fullscreen.framerate = 0;

        wl_list_remove(&shsurf->fullscreen.transform.link);
        wl_list_init(&shsurf->fullscreen.transform.link);

        if (shsurf->fullscreen.black_view)
                weston_surface_destroy(shsurf->fullscreen.black_view->surface);
        shsurf->fullscreen.black_view = NULL;

        if (shsurf->saved_position_valid)
                weston_view_set_position(shsurf->view,
                                         shsurf->saved_x, shsurf->saved_y);
        else
                weston_view_set_initial_position(shsurf->view, shsurf->shell);

        if (shsurf->saved_rotation_valid) {
                wl_list_insert(&shsurf->view->geometry.transformation_list,
                               &shsurf->rotation.transform.link);
                shsurf->saved_rotation_valid = false;
        }

        /* Layer is updated in set_surface_type(). */
}

static void
shell_surface_set_fullscreen(struct wl_client *client,
                             struct wl_resource *resource,
                             uint32_t method,
                             uint32_t framerate,
                             struct wl_resource *output_resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_output *output;

        if (output_resource)
                output = wl_resource_get_user_data(output_resource);
        else
                output = NULL;

        shell_surface_set_parent(shsurf, NULL);

        surface_clear_next_states(shsurf);
        shsurf->next_state.fullscreen = true;
        shsurf->state_changed = true;
        set_fullscreen(shsurf, method, framerate, output);
}

static void
set_popup(struct shell_surface *shsurf,
          struct weston_surface *parent,
          struct weston_seat *seat,
          uint32_t serial,
          int32_t x,
          int32_t y)
{
        assert(parent != NULL);

        shsurf->popup.shseat = get_shell_seat(seat);
        shsurf->popup.serial = serial;
        shsurf->popup.x = x;
        shsurf->popup.y = y;

        shsurf->type = SHELL_SURFACE_POPUP;
}

static void
shell_surface_set_popup(struct wl_client *client,
                        struct wl_resource *resource,
                        struct wl_resource *seat_resource,
                        uint32_t serial,
                        struct wl_resource *parent_resource,
                        int32_t x, int32_t y, uint32_t flags)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_surface *parent =
                wl_resource_get_user_data(parent_resource);

        shell_surface_set_parent(shsurf, parent);

        surface_clear_next_states(shsurf);
        set_popup(shsurf,
                  parent,
                  wl_resource_get_user_data(seat_resource),
                  serial, x, y);
}

static void
unset_maximized(struct shell_surface *shsurf)
{
        /* undo all maximized things here */
        shsurf->output = get_default_output(shsurf->surface->compositor);

        if (shsurf->saved_position_valid)
                weston_view_set_position(shsurf->view,
                                         shsurf->saved_x, shsurf->saved_y);
        else
                weston_view_set_initial_position(shsurf->view, shsurf->shell);

        if (shsurf->saved_rotation_valid) {
                wl_list_insert(&shsurf->view->geometry.transformation_list,
                               &shsurf->rotation.transform.link);
                shsurf->saved_rotation_valid = false;
        }

        /* Layer is updated in set_surface_type(). */
}

static void
set_minimized(struct weston_surface *surface, uint32_t is_true)
{
        struct shell_surface *shsurf;
        struct workspace *current_ws;
        struct weston_seat *seat;
        struct weston_surface *focus;
        struct weston_view *view;

        view = get_default_view(surface);
        if (!view)
                return;

        assert(weston_surface_get_main_surface(view->surface) == view->surface);

        shsurf = get_shell_surface(surface);
        current_ws = get_current_workspace(shsurf->shell);

        weston_layer_entry_remove(&view->layer_link);
         /* hide or show, depending on the state */
        if (is_true) {
                weston_layer_entry_insert(&shsurf->shell->minimized_layer.view_list, &view->layer_link);

                drop_focus_state(shsurf->shell, current_ws, view->surface);
                wl_list_for_each(seat, &shsurf->shell->compositor->seat_list, link) {
                        if (!seat->keyboard)
                                continue;
                        focus = weston_surface_get_main_surface(seat->keyboard->focus);
                        if (focus == view->surface)
                                weston_keyboard_set_focus(seat->keyboard, NULL);
                }
        }
        else {
                weston_layer_entry_insert(&current_ws->layer.view_list, &view->layer_link);

                wl_list_for_each(seat, &shsurf->shell->compositor->seat_list, link) {
                        if (!seat->keyboard)
                                continue;
                        activate(shsurf->shell, view->surface, seat, true);
                }
        }

        shell_surface_update_child_surface_layers(shsurf);

        weston_view_damage_below(view);
}

static void
shell_surface_set_maximized(struct wl_client *client,
                            struct wl_resource *resource,
                            struct wl_resource *output_resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_output *output;

        surface_clear_next_states(shsurf);
        shsurf->next_state.maximized = true;
        shsurf->state_changed = true;

        shsurf->type = SHELL_SURFACE_TOPLEVEL;
        shell_surface_set_parent(shsurf, NULL);

        if (output_resource)
                output = wl_resource_get_user_data(output_resource);
        else
                output = NULL;

        shell_surface_set_output(shsurf, output);

        send_configure_for_surface(shsurf);
}

/* This is only ever called from set_surface_type(), so there’s no need to
 * update layer_links here, since they’ll be updated when we return. */
static int
reset_surface_type(struct shell_surface *surface)
{
        if (surface->state.fullscreen)
                unset_fullscreen(surface);
        if (surface->state.maximized)
                unset_maximized(surface);

        return 0;
}

static void
set_full_output(struct shell_surface *shsurf)
{
        shsurf->saved_x = shsurf->view->geometry.x;
        shsurf->saved_y = shsurf->view->geometry.y;
        shsurf->saved_width = shsurf->surface->width;
        shsurf->saved_height = shsurf->surface->height;
        shsurf->saved_size_valid = true;
        shsurf->saved_position_valid = true;

        if (!wl_list_empty(&shsurf->rotation.transform.link)) {
                wl_list_remove(&shsurf->rotation.transform.link);
                wl_list_init(&shsurf->rotation.transform.link);
                weston_view_geometry_dirty(shsurf->view);
                shsurf->saved_rotation_valid = true;
        }
}

static void
set_surface_type(struct shell_surface *shsurf)
{
        struct weston_surface *pes = shsurf->parent;
        struct weston_view *pev = get_default_view(pes);

        reset_surface_type(shsurf);

        shsurf->state = shsurf->next_state;
        shsurf->state_changed = false;

        switch (shsurf->type) {
        case SHELL_SURFACE_TOPLEVEL:
                if (shsurf->state.maximized || shsurf->state.fullscreen) {
                        set_full_output(shsurf);
                } else if (shsurf->state.relative && pev) {
                        weston_view_set_position(shsurf->view,
                                                 pev->geometry.x + shsurf->transient.x,
                                                 pev->geometry.y + shsurf->transient.y);
                }
                break;

        case SHELL_SURFACE_XWAYLAND:
                weston_view_set_position(shsurf->view, shsurf->transient.x,
                                         shsurf->transient.y);
                break;

        case SHELL_SURFACE_POPUP:
        case SHELL_SURFACE_NONE:
        default:
                break;
        }

        /* Update the surface’s layer. */
        shell_surface_update_layer(shsurf);
}

static struct desktop_shell *
shell_surface_get_shell(struct shell_surface *shsurf)
{
        return shsurf->shell;
}

static void
black_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy);

static struct weston_view *
create_black_surface(struct weston_compositor *ec,
                     struct weston_surface *fs_surface,
                     float x, float y, int w, int h)
{
        struct weston_surface *surface = NULL;
        struct weston_view *view;

        surface = weston_surface_create(ec);
        if (surface == NULL) {
                weston_log("no memory\n");
                return NULL;
        }
        view = weston_view_create(surface);
        if (surface == NULL) {
                weston_log("no memory\n");
                weston_surface_destroy(surface);
                return NULL;
        }

        surface->configure = black_surface_configure;
        surface->configure_private = fs_surface;
        weston_surface_set_color(surface, 0.0, 0.0, 0.0, 1);
        pixman_region32_fini(&surface->opaque);
        pixman_region32_init_rect(&surface->opaque, 0, 0, w, h);
        pixman_region32_fini(&surface->input);
        pixman_region32_init_rect(&surface->input, 0, 0, w, h);

        weston_surface_set_size(surface, w, h);
        weston_view_set_position(view, x, y);

        return view;
}

static void
shell_ensure_fullscreen_black_view(struct shell_surface *shsurf)
{
        struct weston_output *output = shsurf->fullscreen_output;

        assert(shsurf->state.fullscreen);

        if (!shsurf->fullscreen.black_view)
                shsurf->fullscreen.black_view =
                        create_black_surface(shsurf->surface->compositor,
                                             shsurf->surface,
                                             output->x, output->y,
                                             output->width,
                                             output->height);

        weston_view_geometry_dirty(shsurf->fullscreen.black_view);
        weston_layer_entry_remove(&shsurf->fullscreen.black_view->layer_link);
        weston_layer_entry_insert(&shsurf->view->layer_link,
                                  &shsurf->fullscreen.black_view->layer_link);
        weston_view_geometry_dirty(shsurf->fullscreen.black_view);
        weston_surface_damage(shsurf->surface);

        shsurf->state.lowered = false;
}

/* Create black surface and append it to the associated fullscreen surface.
 * Handle size dismatch and positioning according to the method. */
static void
shell_configure_fullscreen(struct shell_surface *shsurf)
{
        struct weston_output *output = shsurf->fullscreen_output;
        struct weston_surface *surface = shsurf->surface;
        struct weston_matrix *matrix;
        float scale, output_aspect, surface_aspect, x, y;
        int32_t surf_x, surf_y, surf_width, surf_height;

        if (shsurf->fullscreen.type != WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER)
                restore_output_mode(output);

        /* Reverse the effect of lower_fullscreen_layer() */
        weston_layer_entry_remove(&shsurf->view->layer_link);
        weston_layer_entry_insert(&shsurf->shell->fullscreen_layer.view_list, &shsurf->view->layer_link);

        shell_ensure_fullscreen_black_view(shsurf);

        surface_subsurfaces_boundingbox(shsurf->surface, &surf_x, &surf_y,
                                        &surf_width, &surf_height);

        switch (shsurf->fullscreen.type) {
        case WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT:
                if (surface->buffer_ref.buffer)
                        center_on_output(shsurf->view, shsurf->fullscreen_output);
                break;
        case WL_SHELL_SURFACE_FULLSCREEN_METHOD_SCALE:
                /* 1:1 mapping between surface and output dimensions */
                if (output->width == surf_width &&
                        output->height == surf_height) {
                        weston_view_set_position(shsurf->view,
                                                 output->x - surf_x,
                                                 output->y - surf_y);
                        break;
                }

                matrix = &shsurf->fullscreen.transform.matrix;
                weston_matrix_init(matrix);

                output_aspect = (float) output->width /
                        (float) output->height;
                /* XXX: Use surf_width and surf_height here? */
                surface_aspect = (float) surface->width /
                        (float) surface->height;
                if (output_aspect < surface_aspect)
                        scale = (float) output->width /
                                (float) surf_width;
                else
                        scale = (float) output->height /
                                (float) surf_height;

                weston_matrix_scale(matrix, scale, scale, 1);
                wl_list_remove(&shsurf->fullscreen.transform.link);
                wl_list_insert(&shsurf->view->geometry.transformation_list,
                               &shsurf->fullscreen.transform.link);
                x = output->x + (output->width - surf_width * scale) / 2 - surf_x;
                y = output->y + (output->height - surf_height * scale) / 2 - surf_y;
                weston_view_set_position(shsurf->view, x, y);

                break;
        case WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER:
                if (shell_surface_is_top_fullscreen(shsurf)) {
                        struct weston_mode mode = {0,
                                surf_width * surface->buffer_viewport.buffer.scale,
                                surf_height * surface->buffer_viewport.buffer.scale,
                                shsurf->fullscreen.framerate};

                        if (weston_output_switch_mode(output, &mode, surface->buffer_viewport.buffer.scale,
                                        WESTON_MODE_SWITCH_SET_TEMPORARY) == 0) {
                                weston_view_set_position(shsurf->view,
                                                         output->x - surf_x,
                                                         output->y - surf_y);
                                shsurf->fullscreen.black_view->surface->width = output->width;
                                shsurf->fullscreen.black_view->surface->height = output->height;
                                weston_view_set_position(shsurf->fullscreen.black_view,
                                                         output->x - surf_x,
                                                         output->y - surf_y);
                                break;
                        } else {
                                restore_output_mode(output);
                                center_on_output(shsurf->view, output);
                        }
                }
                break;
        case WL_SHELL_SURFACE_FULLSCREEN_METHOD_FILL:
                center_on_output(shsurf->view, output);
                break;
        default:
                break;
        }
}

static void
shell_map_fullscreen(struct shell_surface *shsurf)
{
        shell_configure_fullscreen(shsurf);
}

static void
set_xwayland(struct shell_surface *shsurf, int x, int y, uint32_t flags)
{
        /* XXX: using the same fields for transient type */
        surface_clear_next_states(shsurf);
        shsurf->transient.x = x;
        shsurf->transient.y = y;
        shsurf->transient.flags = flags;

        shell_surface_set_parent(shsurf, NULL);

        shsurf->type = SHELL_SURFACE_XWAYLAND;
        shsurf->state_changed = true;
}

static void
shell_interface_set_fullscreen(struct shell_surface *shsurf,
                               uint32_t method,
                               uint32_t framerate,
                               struct weston_output *output)
{
        surface_clear_next_states(shsurf);
        set_fullscreen(shsurf, method, framerate, output);

        shsurf->next_state.fullscreen = true;
        shsurf->state_changed = true;
}

static int
shell_interface_move(struct shell_surface *shsurf, struct weston_seat *ws)
{
        return surface_move(shsurf, ws, 1);
}

static const struct weston_pointer_grab_interface popup_grab_interface;

static void
destroy_shell_seat(struct wl_listener *listener, void *data)
{
        struct shell_seat *shseat =
                container_of(listener,
                             struct shell_seat, seat_destroy_listener);
        struct shell_surface *shsurf, *prev = NULL;

        if (shseat->popup_grab.grab.interface == &popup_grab_interface) {
                weston_pointer_end_grab(shseat->popup_grab.grab.pointer);
                shseat->popup_grab.client = NULL;

                wl_list_for_each(shsurf, &shseat->popup_grab.surfaces_list, popup.grab_link) {
                        shsurf->popup.shseat = NULL;
                        if (prev) {
                                wl_list_init(&prev->popup.grab_link);
                        }
                        prev = shsurf;
                }
                wl_list_init(&prev->popup.grab_link);
        }

        wl_list_remove(&shseat->seat_destroy_listener.link);
        free(shseat);
}

static void
shell_seat_caps_changed(struct wl_listener *listener, void *data)
{
        struct shell_seat *seat;

        seat = container_of(listener, struct shell_seat, caps_changed_listener);

        if (seat->seat->keyboard &&
            wl_list_empty(&seat->keyboard_focus_listener.link)) {
                wl_signal_add(&seat->seat->keyboard->focus_signal,
                              &seat->keyboard_focus_listener);
        } else if (!seat->seat->keyboard) {
                wl_list_init(&seat->keyboard_focus_listener.link);
        }

        if (seat->seat->pointer &&
            wl_list_empty(&seat->pointer_focus_listener.link)) {
                wl_signal_add(&seat->seat->pointer->focus_signal,
                              &seat->pointer_focus_listener);
        } else if (!seat->seat->pointer) {
                wl_list_init(&seat->pointer_focus_listener.link);
        }
}

static struct shell_seat *
create_shell_seat(struct weston_seat *seat)
{
        struct shell_seat *shseat;

        shseat = calloc(1, sizeof *shseat);
        if (!shseat) {
                weston_log("no memory to allocate shell seat\n");
                return NULL;
        }

        shseat->seat = seat;
        wl_list_init(&shseat->popup_grab.surfaces_list);

        shseat->seat_destroy_listener.notify = destroy_shell_seat;
        wl_signal_add(&seat->destroy_signal,
                      &shseat->seat_destroy_listener);

        shseat->keyboard_focus_listener.notify = handle_keyboard_focus;
        wl_list_init(&shseat->keyboard_focus_listener.link);

        shseat->pointer_focus_listener.notify = handle_pointer_focus;
        wl_list_init(&shseat->pointer_focus_listener.link);

        shseat->caps_changed_listener.notify = shell_seat_caps_changed;
        wl_signal_add(&seat->updated_caps_signal,
                      &shseat->caps_changed_listener);
        shell_seat_caps_changed(&shseat->caps_changed_listener, NULL);

        return shseat;
}

static struct shell_seat *
get_shell_seat(struct weston_seat *seat)
{
        struct wl_listener *listener;

        listener = wl_signal_get(&seat->destroy_signal, destroy_shell_seat);
        assert(listener != NULL);

        return container_of(listener,
                            struct shell_seat, seat_destroy_listener);
}

static void
popup_grab_focus(struct weston_pointer_grab *grab)
{
        struct weston_pointer *pointer = grab->pointer;
        struct weston_view *view;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.grab);
        struct wl_client *client = shseat->popup_grab.client;
        wl_fixed_t sx, sy;

        view = weston_compositor_pick_view(pointer->seat->compositor,
                                           pointer->x, pointer->y,
                                           &sx, &sy);

        if (view && view->surface->resource &&
            wl_resource_get_client(view->surface->resource) == client) {
                weston_pointer_set_focus(pointer, view, sx, sy);
        } else {
                weston_pointer_set_focus(pointer, NULL,
                                         wl_fixed_from_int(0),
                                         wl_fixed_from_int(0));
        }
}

static void
popup_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
                  wl_fixed_t x, wl_fixed_t y)
{
        struct weston_pointer *pointer = grab->pointer;
        struct wl_resource *resource;
        wl_fixed_t sx, sy;

        if (pointer->focus) {
                weston_view_from_global_fixed(pointer->focus, x, y,
                                              &pointer->sx, &pointer->sy);
        }

        weston_pointer_move(pointer, x, y);

        wl_resource_for_each(resource, &pointer->focus_resource_list) {
                weston_view_from_global_fixed(pointer->focus,
                                              pointer->x, pointer->y,
                                              &sx, &sy);
                wl_pointer_send_motion(resource, time, sx, sy);
        }
}

static void
popup_grab_button(struct weston_pointer_grab *grab,
                  uint32_t time, uint32_t button, uint32_t state_w)
{
        struct wl_resource *resource;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.grab);
        struct wl_display *display = shseat->seat->compositor->wl_display;
        enum wl_pointer_button_state state = state_w;
        uint32_t serial;
        struct wl_list *resource_list;

        resource_list = &grab->pointer->focus_resource_list;
        if (!wl_list_empty(resource_list)) {
                serial = wl_display_get_serial(display);
                wl_resource_for_each(resource, resource_list) {
                        wl_pointer_send_button(resource, serial,
                                               time, button, state);
                }
        } else if (state == WL_POINTER_BUTTON_STATE_RELEASED &&
                   (shseat->popup_grab.initial_up ||
                    time - shseat->seat->pointer->grab_time > 500)) {
                popup_grab_end(grab->pointer);
        }

        if (state == WL_POINTER_BUTTON_STATE_RELEASED)
                shseat->popup_grab.initial_up = 1;
}

static void
popup_grab_cancel(struct weston_pointer_grab *grab)
{
        popup_grab_end(grab->pointer);
}

static const struct weston_pointer_grab_interface popup_grab_interface = {
        popup_grab_focus,
        popup_grab_motion,
        popup_grab_button,
        popup_grab_cancel,
};

static void
touch_popup_grab_down(struct weston_touch_grab *grab, uint32_t time,
                      int touch_id, wl_fixed_t sx, wl_fixed_t sy)
{
        struct wl_resource *resource;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.touch_grab);
        struct wl_display *display = shseat->seat->compositor->wl_display;
        uint32_t serial;
        struct wl_list *resource_list;

        resource_list = &grab->touch->focus_resource_list;
        if (!wl_list_empty(resource_list)) {
                serial = wl_display_get_serial(display);
                wl_resource_for_each(resource, resource_list) {
                        wl_touch_send_down(resource, serial, time,
                                grab->touch->focus->surface->resource,
                                touch_id, sx, sy);
                }
        }
}

static void
touch_popup_grab_up(struct weston_touch_grab *grab, uint32_t time, int touch_id)
{
        struct wl_resource *resource;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.touch_grab);
        struct wl_display *display = shseat->seat->compositor->wl_display;
        uint32_t serial;
        struct wl_list *resource_list;

        resource_list = &grab->touch->focus_resource_list;
        if (!wl_list_empty(resource_list)) {
                serial = wl_display_get_serial(display);
                wl_resource_for_each(resource, resource_list) {
                        wl_touch_send_up(resource, serial, time, touch_id);
                }
        }
}

static void
touch_popup_grab_motion(struct weston_touch_grab *grab, uint32_t time,
                        int touch_id, wl_fixed_t sx, wl_fixed_t sy)
{
        struct wl_resource *resource;
        struct wl_list *resource_list;

        resource_list = &grab->touch->focus_resource_list;
        if (!wl_list_empty(resource_list)) {
                wl_resource_for_each(resource, resource_list) {
                        wl_touch_send_motion(resource, time, touch_id, sx, sy);
                }
        }
}

static void
touch_popup_grab_frame(struct weston_touch_grab *grab)
{
}

static void
touch_popup_grab_cancel(struct weston_touch_grab *grab)
{
        touch_popup_grab_end(grab->touch);
}

static const struct weston_touch_grab_interface touch_popup_grab_interface = {
        touch_popup_grab_down,
        touch_popup_grab_up,
        touch_popup_grab_motion,
        touch_popup_grab_frame,
        touch_popup_grab_cancel,
};

static void
shell_surface_send_popup_done(struct shell_surface *shsurf)
{
        if (shell_surface_is_wl_shell_surface(shsurf))
                wl_shell_surface_send_popup_done(shsurf->resource);
        else if (shell_surface_is_xdg_popup(shsurf))
                xdg_popup_send_popup_done(shsurf->resource,
                                          shsurf->popup.serial);
}

static void
popup_grab_end(struct weston_pointer *pointer)
{
        struct weston_pointer_grab *grab = pointer->grab;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.grab);
        struct shell_surface *shsurf;
        struct shell_surface *prev = NULL;

        if (pointer->grab->interface == &popup_grab_interface) {
                weston_pointer_end_grab(grab->pointer);
                shseat->popup_grab.client = NULL;
                shseat->popup_grab.grab.interface = NULL;
                assert(!wl_list_empty(&shseat->popup_grab.surfaces_list));
                /* Send the popup_done event to all the popups open */
                wl_list_for_each(shsurf, &shseat->popup_grab.surfaces_list, popup.grab_link) {
                        shell_surface_send_popup_done(shsurf);
                        shsurf->popup.shseat = NULL;
                        if (prev) {
                                wl_list_init(&prev->popup.grab_link);
                        }
                        prev = shsurf;
                }
                wl_list_init(&prev->popup.grab_link);
                wl_list_init(&shseat->popup_grab.surfaces_list);
        }
}

static void
touch_popup_grab_end(struct weston_touch *touch)
{
        struct weston_touch_grab *grab = touch->grab;
        struct shell_seat *shseat =
            container_of(grab, struct shell_seat, popup_grab.touch_grab);
        struct shell_surface *shsurf;
        struct shell_surface *prev = NULL;

        if (touch->grab->interface == &touch_popup_grab_interface) {
                weston_touch_end_grab(grab->touch);
                shseat->popup_grab.client = NULL;
                shseat->popup_grab.touch_grab.interface = NULL;
                assert(!wl_list_empty(&shseat->popup_grab.surfaces_list));
                /* Send the popup_done event to all the popups open */
                wl_list_for_each(shsurf, &shseat->popup_grab.surfaces_list, popup.grab_link) {
                        shell_surface_send_popup_done(shsurf);
                        shsurf->popup.shseat = NULL;
                        if (prev) {
                                wl_list_init(&prev->popup.grab_link);
                        }
                        prev = shsurf;
                }
                wl_list_init(&prev->popup.grab_link);
                wl_list_init(&shseat->popup_grab.surfaces_list);
        }
}

static void
add_popup_grab(struct shell_surface *shsurf, struct shell_seat *shseat, int32_t type)
{
        struct weston_seat *seat = shseat->seat;

        if (wl_list_empty(&shseat->popup_grab.surfaces_list)) {
                shseat->popup_grab.type = type;
                shseat->popup_grab.client = wl_resource_get_client(shsurf->resource);

                if (type == POINTER) {
                        shseat->popup_grab.grab.interface = &popup_grab_interface;
                        /* We must make sure here that this popup was opened after
                         * a mouse press, and not just by moving around with other
                         * popups already open. */
                        if (shseat->seat->pointer->button_count > 0)
                                shseat->popup_grab.initial_up = 0;
                } else if (type == TOUCH) {
                        shseat->popup_grab.touch_grab.interface = &touch_popup_grab_interface;
                }

                wl_list_insert(&shseat->popup_grab.surfaces_list, &shsurf->popup.grab_link);

                if (type == POINTER)
                        weston_pointer_start_grab(seat->pointer, &shseat->popup_grab.grab);
                else if (type == TOUCH)
                        weston_touch_start_grab(seat->touch, &shseat->popup_grab.touch_grab);
        } else {
                wl_list_insert(&shseat->popup_grab.surfaces_list, &shsurf->popup.grab_link);
        }
}

static void
remove_popup_grab(struct shell_surface *shsurf)
{
        struct shell_seat *shseat = shsurf->popup.shseat;

        wl_list_remove(&shsurf->popup.grab_link);
        wl_list_init(&shsurf->popup.grab_link);
        if (wl_list_empty(&shseat->popup_grab.surfaces_list)) {
                if (shseat->popup_grab.type == POINTER) {
                        weston_pointer_end_grab(shseat->popup_grab.grab.pointer);
                        shseat->popup_grab.grab.interface = NULL;
                } else if (shseat->popup_grab.type == TOUCH) {
                        weston_touch_end_grab(shseat->popup_grab.touch_grab.touch);
                        shseat->popup_grab.touch_grab.interface = NULL;
                }
        }
}

static void
shell_map_popup(struct shell_surface *shsurf)
{
        struct shell_seat *shseat = shsurf->popup.shseat;
        struct weston_view *parent_view = get_default_view(shsurf->parent);

        shsurf->surface->output = parent_view->output;
        shsurf->view->output = parent_view->output;

        weston_view_set_transform_parent(shsurf->view, parent_view);
        weston_view_set_position(shsurf->view, shsurf->popup.x, shsurf->popup.y);
        weston_view_update_transform(shsurf->view);

        if (shseat->seat->pointer &&
            shseat->seat->pointer->grab_serial == shsurf->popup.serial) {
                add_popup_grab(shsurf, shseat, POINTER);
        } else if (shseat->seat->touch &&
                   shseat->seat->touch->grab_serial == shsurf->popup.serial) {
                add_popup_grab(shsurf, shseat, TOUCH);
        } else {
                shell_surface_send_popup_done(shsurf);
                shseat->popup_grab.client = NULL;
        }
}

static const struct wl_shell_surface_interface shell_surface_implementation = {
        shell_surface_pong,
        shell_surface_move,
        shell_surface_resize,
        shell_surface_set_toplevel,
        shell_surface_set_transient,
        shell_surface_set_fullscreen,
        shell_surface_set_popup,
        shell_surface_set_maximized,
        shell_surface_set_title,
        shell_surface_set_class
};

static void
destroy_shell_surface(struct shell_surface *shsurf)
{
        struct shell_surface *child, *next;

        wl_signal_emit(&shsurf->destroy_signal, shsurf);

        if (!wl_list_empty(&shsurf->popup.grab_link)) {
                remove_popup_grab(shsurf);
        }

        if (shsurf->fullscreen.type == WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER &&
            shell_surface_is_top_fullscreen(shsurf))
                restore_output_mode (shsurf->fullscreen_output);

        if (shsurf->fullscreen.black_view)
                weston_surface_destroy(shsurf->fullscreen.black_view->surface);

        /* As destroy_resource() use wl_list_for_each_safe(),
         * we can always remove the listener.
         */
        wl_list_remove(&shsurf->surface_destroy_listener.link);
        shsurf->surface->configure = NULL;
        free(shsurf->title);

        weston_view_destroy(shsurf->view);

        wl_list_remove(&shsurf->children_link);
        wl_list_for_each_safe(child, next, &shsurf->children_list, children_link)
                shell_surface_set_parent(child, NULL);

        wl_list_remove(&shsurf->link);
        free(shsurf);
}

static void
shell_destroy_shell_surface(struct wl_resource *resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        if (!wl_list_empty(&shsurf->popup.grab_link))
                remove_popup_grab(shsurf);
        shsurf->resource = NULL;
}

static void
shell_handle_surface_destroy(struct wl_listener *listener, void *data)
{
        struct shell_surface *shsurf = container_of(listener,
                                                    struct shell_surface,
                                                    surface_destroy_listener);

        if (shsurf->resource)
                wl_resource_destroy(shsurf->resource);

        destroy_shell_surface(shsurf);
}

static void
fade_out_done(struct weston_view_animation *animation, void *data)
{
        struct shell_surface *shsurf = data;

        weston_surface_destroy(shsurf->surface);
}

static void
handle_resource_destroy(struct wl_listener *listener, void *data)
{
        struct shell_surface *shsurf =
                container_of(listener, struct shell_surface,
                             resource_destroy_listener);

        if (!weston_surface_is_mapped(shsurf->surface))
                return;

        shsurf->surface->ref_count++;

        pixman_region32_fini(&shsurf->surface->pending.input);
        pixman_region32_init(&shsurf->surface->pending.input);
        pixman_region32_fini(&shsurf->surface->input);
        pixman_region32_init(&shsurf->surface->input);
        if (shsurf->shell->win_close_animation_type == ANIMATION_FADE) {
                weston_fade_run(shsurf->view, 1.0, 0.0, 300.0,
                                fade_out_done, shsurf);
        } else {
                weston_surface_destroy(shsurf->surface);
        }
}

static void
shell_surface_configure(struct weston_surface *, int32_t, int32_t);

struct shell_surface *
get_shell_surface(struct weston_surface *surface)
{
        if (surface->configure == shell_surface_configure)
                return surface->configure_private;
        else
                return NULL;
}

static struct shell_surface *
create_common_surface(struct shell_client *owner, void *shell,
                      struct weston_surface *surface,
                      const struct weston_shell_client *client)
{
        struct shell_surface *shsurf;

        if (surface->configure) {
                weston_log("surface->configure already set\n");
                return NULL;
        }

        shsurf = calloc(1, sizeof *shsurf);
        if (!shsurf) {
                weston_log("no memory to allocate shell surface\n");
                return NULL;
        }

        shsurf->view = weston_view_create(surface);
        if (!shsurf->view) {
                weston_log("no memory to allocate shell surface\n");
                free(shsurf);
                return NULL;
        }

        surface->configure = shell_surface_configure;
        surface->configure_private = shsurf;

        shsurf->resource_destroy_listener.notify = handle_resource_destroy;
        wl_resource_add_destroy_listener(surface->resource,
                                         &shsurf->resource_destroy_listener);
        shsurf->owner = owner;

        shsurf->shell = (struct desktop_shell *) shell;
        shsurf->unresponsive = 0;
        shsurf->saved_position_valid = false;
        shsurf->saved_size_valid = false;
        shsurf->saved_rotation_valid = false;
        shsurf->surface = surface;
        shsurf->fullscreen.type = WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT;
        shsurf->fullscreen.framerate = 0;
        shsurf->fullscreen.black_view = NULL;
        wl_list_init(&shsurf->fullscreen.transform.link);

        shsurf->output = get_default_output(shsurf->shell->compositor);

        wl_signal_init(&shsurf->destroy_signal);
        shsurf->surface_destroy_listener.notify = shell_handle_surface_destroy;
        wl_signal_add(&surface->destroy_signal,
                      &shsurf->surface_destroy_listener);

        /* init link so its safe to always remove it in destroy_shell_surface */
        wl_list_init(&shsurf->link);
        wl_list_init(&shsurf->popup.grab_link);

        /* empty when not in use */
        wl_list_init(&shsurf->rotation.transform.link);
        weston_matrix_init(&shsurf->rotation.rotation);

        wl_list_init(&shsurf->workspace_transform.link);

        wl_list_init(&shsurf->children_link);
        wl_list_init(&shsurf->children_list);
        shsurf->parent = NULL;

        shsurf->type = SHELL_SURFACE_NONE;

        shsurf->client = client;

        return shsurf;
}

static struct shell_surface *
create_shell_surface(void *shell, struct weston_surface *surface,
                     const struct weston_shell_client *client)
{
        return create_common_surface(NULL, shell, surface, client);
}

static struct weston_view *
get_primary_view(void *shell, struct shell_surface *shsurf)
{
        return shsurf->view;
}

static void
shell_get_shell_surface(struct wl_client *client,
                        struct wl_resource *resource,
                        uint32_t id,
                        struct wl_resource *surface_resource)
{
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct shell_client *sc = wl_resource_get_user_data(resource);
        struct desktop_shell *shell = sc->shell;
        struct shell_surface *shsurf;

        if (get_shell_surface(surface)) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "desktop_shell::get_shell_surface already requested");
                return;
        }

        shsurf = create_common_surface(sc, shell, surface, &shell_client);
        if (!shsurf) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "surface->configure already set");
                return;
        }

        shsurf->resource =
                wl_resource_create(client,
                                   &wl_shell_surface_interface, 1, id);
        wl_resource_set_implementation(shsurf->resource,
                                       &shell_surface_implementation,
                                       shsurf, shell_destroy_shell_surface);
}

static bool
shell_surface_is_wl_shell_surface(struct shell_surface *shsurf)
{
        /* A shell surface without a resource is created from xwayland
         * and is considered a wl_shell surface for now. */

        return shsurf->resource == NULL ||
                wl_resource_instance_of(shsurf->resource,
                                        &wl_shell_surface_interface,
                                        &shell_surface_implementation);
}

static const struct wl_shell_interface shell_implementation = {
        shell_get_shell_surface
};

/****************************
 * xdg-shell implementation */

static void
xdg_surface_destroy(struct wl_client *client,
                    struct wl_resource *resource)
{
        wl_resource_destroy(resource);
}

static void
xdg_surface_set_parent(struct wl_client *client,
                       struct wl_resource *resource,
                       struct wl_resource *parent_resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_surface *parent;

        if (parent_resource)
                parent = wl_resource_get_user_data(parent_resource);
        else
                parent = NULL;

        shell_surface_set_parent(shsurf, parent);
}

static void
xdg_surface_set_app_id(struct wl_client *client,
                       struct wl_resource *resource,
                       const char *app_id)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        free(shsurf->class);
        shsurf->class = strdup(app_id);
}

static void
xdg_surface_show_window_menu(struct wl_client *client,
                             struct wl_resource *surface_resource,
                             struct wl_resource *seat_resource,
                             uint32_t serial,
                             int32_t x,
                             int32_t y)
{
        /* TODO */
}

static void
xdg_surface_set_title(struct wl_client *client,
                        struct wl_resource *resource, const char *title)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        set_title(shsurf, title);
}

static void
xdg_surface_move(struct wl_client *client, struct wl_resource *resource,
                 struct wl_resource *seat_resource, uint32_t serial)
{
        common_surface_move(resource, seat_resource, serial);
}

static void
xdg_surface_resize(struct wl_client *client, struct wl_resource *resource,
                   struct wl_resource *seat_resource, uint32_t serial,
                   uint32_t edges)
{
        common_surface_resize(resource, seat_resource, serial, edges);
}

static void
xdg_surface_ack_configure(struct wl_client *client,
                          struct wl_resource *resource,
                          uint32_t serial)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        if (shsurf->state_requested) {
                shsurf->next_state = shsurf->requested_state;
                shsurf->state_changed = true;
                shsurf->state_requested = false;
        }
}

static void
xdg_surface_set_window_geometry(struct wl_client *client,
                                struct wl_resource *resource,
                                int32_t x,
                                int32_t y,
                                int32_t width,
                                int32_t height)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        set_window_geometry(shsurf, x, y, width, height);
}

static void
xdg_surface_set_maximized(struct wl_client *client,
                          struct wl_resource *resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        shsurf->state_requested = true;
        shsurf->requested_state.maximized = true;
        send_configure_for_surface(shsurf);
}

static void
xdg_surface_unset_maximized(struct wl_client *client,
                            struct wl_resource *resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        shsurf->state_requested = true;
        shsurf->requested_state.maximized = false;
        send_configure_for_surface(shsurf);
}

static struct weston_output *
get_focused_output(struct weston_compositor *compositor)
{
        struct weston_seat *seat;
        struct weston_output *output = NULL;

        wl_list_for_each(seat, &compositor->seat_list, link) {
                /* Priority has touch focus, then pointer and
                 * then keyboard focus. We should probably have
                 * three for loops and check frist for touch,
                 * then for pointer, etc. but unless somebody has some
                 * objections, I think this is sufficient. */
                if (seat->touch && seat->touch->focus)
                        output = seat->touch->focus->output;
                else if (seat->pointer && seat->pointer->focus)
                        output = seat->pointer->focus->output;
                else if (seat->keyboard && seat->keyboard->focus)
                        output = seat->keyboard->focus->output;

                if (output)
                        break;
        }

        return output;
}

static void
xdg_surface_set_fullscreen(struct wl_client *client,
                           struct wl_resource *resource,
                           struct wl_resource *output_resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);
        struct weston_output *output;

        shsurf->state_requested = true;
        shsurf->requested_state.fullscreen = true;

        if (output_resource)
                output = wl_resource_get_user_data(output_resource);
        else
                output = NULL;

        /* handle clients launching in fullscreen */
        if (output == NULL && !weston_surface_is_mapped(shsurf->surface)) {
                /* Set the output to the one that has focus currently. */
                assert(shsurf->surface);
                output = get_focused_output(shsurf->surface->compositor);
        }

        shell_surface_set_output(shsurf, output);
        shsurf->fullscreen_output = shsurf->output;

        send_configure_for_surface(shsurf);
}

static void
xdg_surface_unset_fullscreen(struct wl_client *client,
                             struct wl_resource *resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        shsurf->state_requested = true;
        shsurf->requested_state.fullscreen = false;
        send_configure_for_surface(shsurf);
}

static void
xdg_surface_set_minimized(struct wl_client *client,
                            struct wl_resource *resource)
{
        struct shell_surface *shsurf = wl_resource_get_user_data(resource);

        if (shsurf->type != SHELL_SURFACE_TOPLEVEL)
                return;

         /* apply compositor's own minimization logic (hide) */
        set_minimized(shsurf->surface, 1);
}

static const struct xdg_surface_interface xdg_surface_implementation = {
        xdg_surface_destroy,
        xdg_surface_set_parent,
        xdg_surface_set_title,
        xdg_surface_set_app_id,
        xdg_surface_show_window_menu,
        xdg_surface_move,
        xdg_surface_resize,
        xdg_surface_ack_configure,
        xdg_surface_set_window_geometry,
        xdg_surface_set_maximized,
        xdg_surface_unset_maximized,
        xdg_surface_set_fullscreen,
        xdg_surface_unset_fullscreen,
        xdg_surface_set_minimized,
};

static void
xdg_send_configure(struct weston_surface *surface,
                   int32_t width, int32_t height)
{
        struct shell_surface *shsurf = get_shell_surface(surface);
        uint32_t *s;
        struct wl_array states;
        uint32_t serial;

        assert(shsurf);

        if (!shsurf->resource)
                return;

        wl_array_init(&states);
        if (shsurf->requested_state.fullscreen) {
                s = wl_array_add(&states, sizeof *s);
                *s = XDG_SURFACE_STATE_FULLSCREEN;
        } else if (shsurf->requested_state.maximized) {
                s = wl_array_add(&states, sizeof *s);
                *s = XDG_SURFACE_STATE_MAXIMIZED;
        }
        if (shsurf->resize_edges != 0) {
                s = wl_array_add(&states, sizeof *s);
                *s = XDG_SURFACE_STATE_RESIZING;
        }
        if (shsurf->focus_count > 0) {
                s = wl_array_add(&states, sizeof *s);
                *s = XDG_SURFACE_STATE_ACTIVATED;
        }

        serial = wl_display_next_serial(shsurf->surface->compositor->wl_display);
        xdg_surface_send_configure(shsurf->resource, width, height, &states, serial);

        wl_array_release(&states);
}

static const struct weston_shell_client xdg_client = {
        xdg_send_configure
};

static void
xdg_use_unstable_version(struct wl_client *client,
                         struct wl_resource *resource,
                         int32_t version)
{
        if (version > 1) {
                wl_resource_post_error(resource,
                                       1,
                                       "xdg-shell:: version not implemented yet.");
                return;
        }
}

static struct shell_surface *
create_xdg_surface(struct shell_client *owner, void *shell,
                   struct weston_surface *surface,
                   const struct weston_shell_client *client)
{
        struct shell_surface *shsurf;

        shsurf = create_common_surface(owner, shell, surface, client);
        shsurf->type = SHELL_SURFACE_TOPLEVEL;

        return shsurf;
}

static void
xdg_get_xdg_surface(struct wl_client *client,
                    struct wl_resource *resource,
                    uint32_t id,
                    struct wl_resource *surface_resource)
{
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct shell_client *sc = wl_resource_get_user_data(resource);
        struct desktop_shell *shell = sc->shell;
        struct shell_surface *shsurf;

        if (get_shell_surface(surface)) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "xdg_shell::get_xdg_surface already requested");
                return;
        }

        shsurf = create_xdg_surface(sc, shell, surface, &xdg_client);
        if (!shsurf) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "surface->configure already set");
                return;
        }

        shsurf->resource =
                wl_resource_create(client,
                                   &xdg_surface_interface, 1, id);
        wl_resource_set_implementation(shsurf->resource,
                                       &xdg_surface_implementation,
                                       shsurf, shell_destroy_shell_surface);
}

static bool
shell_surface_is_xdg_surface(struct shell_surface *shsurf)
{
        return shsurf->resource &&
                wl_resource_instance_of(shsurf->resource,
                                        &xdg_surface_interface,
                                        &xdg_surface_implementation);
}

/* xdg-popup implementation */

static void
xdg_popup_destroy(struct wl_client *client,
                  struct wl_resource *resource)
{
        wl_resource_destroy(resource);
}

static const struct xdg_popup_interface xdg_popup_implementation = {
        xdg_popup_destroy,
};

static void
xdg_popup_send_configure(struct weston_surface *surface,
                         int32_t width, int32_t height)
{
}

static const struct weston_shell_client xdg_popup_client = {
        xdg_popup_send_configure
};

static struct shell_surface *
create_xdg_popup(struct shell_client *owner, void *shell,
                 struct weston_surface *surface,
                 const struct weston_shell_client *client,
                 struct weston_surface *parent,
                 struct shell_seat *seat,
                 uint32_t serial,
                 int32_t x, int32_t y)
{
        struct shell_surface *shsurf;

        shsurf = create_common_surface(owner, shell, surface, client);
        shsurf->type = SHELL_SURFACE_POPUP;
        shsurf->popup.shseat = seat;
        shsurf->popup.serial = serial;
        shsurf->popup.x = x;
        shsurf->popup.y = y;
        shell_surface_set_parent(shsurf, parent);

        return shsurf;
}

static void
xdg_get_xdg_popup(struct wl_client *client,
                  struct wl_resource *resource,
                  uint32_t id,
                  struct wl_resource *surface_resource,
                  struct wl_resource *parent_resource,
                  struct wl_resource *seat_resource,
                  uint32_t serial,
                  int32_t x, int32_t y, uint32_t flags)
{
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct shell_client *sc = wl_resource_get_user_data(resource);
        struct desktop_shell *shell = sc->shell;
        struct shell_surface *shsurf;
        struct weston_surface *parent;
        struct shell_seat *seat;

        if (get_shell_surface(surface)) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "xdg_shell::get_xdg_popup already requested");
                return;
        }

        if (!parent_resource) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "xdg_shell::get_xdg_popup requires a parent shell surface");
                return;
        }

        parent = wl_resource_get_user_data(parent_resource);
        seat = get_shell_seat(wl_resource_get_user_data(seat_resource));;

        shsurf = create_xdg_popup(sc, shell, surface, &xdg_popup_client,
                                  parent, seat, serial, x, y);
        if (!shsurf) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "surface->configure already set");
                return;
        }

        shsurf->resource =
                wl_resource_create(client,
                                   &xdg_popup_interface, 1, id);
        wl_resource_set_implementation(shsurf->resource,
                                       &xdg_popup_implementation,
                                       shsurf, shell_destroy_shell_surface);
}

static void
xdg_pong(struct wl_client *client,
         struct wl_resource *resource, uint32_t serial)
{
        struct shell_client *sc = wl_resource_get_user_data(resource);

        shell_client_pong(sc, serial);
}

static bool
shell_surface_is_xdg_popup(struct shell_surface *shsurf)
{
        return wl_resource_instance_of(shsurf->resource,
                                       &xdg_popup_interface,
                                       &xdg_popup_implementation);
}

static const struct xdg_shell_interface xdg_implementation = {
        xdg_use_unstable_version,
        xdg_get_xdg_surface,
        xdg_get_xdg_popup,
        xdg_pong
};

static int
xdg_shell_unversioned_dispatch(const void *implementation,
                               void *_target, uint32_t opcode,
                               const struct wl_message *message,
                               union wl_argument *args)
{
        struct wl_resource *resource = _target;
        struct shell_client *sc = wl_resource_get_user_data(resource);

        if (opcode != 0) {
                wl_resource_post_error(resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "must call use_unstable_version first");
                return 0;
        }

#define XDG_SERVER_VERSION 4

        static_assert(XDG_SERVER_VERSION == XDG_SHELL_VERSION_CURRENT,
                      "shell implementation doesn't match protocol version");

        if (args[0].i != XDG_SERVER_VERSION) {
                wl_resource_post_error(resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "incompatible version, server is %d "
                                       "client wants %d",
                                       XDG_SERVER_VERSION, args[0].i);
                return 0;
        }

        wl_resource_set_implementation(resource, &xdg_implementation,
                                       sc, NULL);

        return 1;
}

/* end of xdg-shell implementation */
/***********************************/

static void
shell_fade(struct desktop_shell *shell, enum fade_type type);

static int
screensaver_timeout(void *data)
{
        struct desktop_shell *shell = data;

        shell_fade(shell, FADE_OUT);

        return 1;
}

static void
handle_screensaver_sigchld(struct weston_process *proc, int status)
{
        struct desktop_shell *shell =
                container_of(proc, struct desktop_shell, screensaver.process);

        proc->pid = 0;

        if (shell->locked)
                weston_compositor_sleep(shell->compositor);
}

static void
launch_screensaver(struct desktop_shell *shell)
{
        if (shell->screensaver.binding)
                return;

        if (!shell->screensaver.path) {
                weston_compositor_sleep(shell->compositor);
                return;
        }

        if (shell->screensaver.process.pid != 0) {
                weston_log("old screensaver still running\n");
                return;
        }

        weston_client_launch(shell->compositor,
                           &shell->screensaver.process,
                           shell->screensaver.path,
                           handle_screensaver_sigchld);
}

static void
terminate_screensaver(struct desktop_shell *shell)
{
        if (shell->screensaver.process.pid == 0)
                return;

        /* Disarm the screensaver timer, otherwise it may fire when the
         * compositor is not in the idle state. In that case, the screen will
         * be locked, but the wake_signal won't fire on user input, making the
         * system unresponsive. */
        wl_event_source_timer_update(shell->screensaver.timer, 0);

        kill(shell->screensaver.process.pid, SIGTERM);
}

static void
configure_static_view(struct weston_view *ev, struct weston_layer *layer)
{
        struct weston_view *v, *next;

        wl_list_for_each_safe(v, next, &layer->view_list.link, layer_link.link) {
                if (v->output == ev->output && v != ev) {
                        weston_view_unmap(v);
                        v->surface->configure = NULL;
                }
        }

        weston_view_set_position(ev, ev->output->x, ev->output->y);

        if (wl_list_empty(&ev->layer_link.link)) {
                weston_layer_entry_insert(&layer->view_list, &ev->layer_link);
                weston_compositor_schedule_repaint(ev->surface->compositor);
        }
}

static void
background_configure(struct weston_surface *es, int32_t sx, int32_t sy)
{
        struct desktop_shell *shell = es->configure_private;
        struct weston_view *view;

        view = container_of(es->views.next, struct weston_view, surface_link);

        configure_static_view(view, &shell->background_layer);
}

static void
desktop_shell_set_background(struct wl_client *client,
                             struct wl_resource *resource,
                             struct wl_resource *output_resource,
                             struct wl_resource *surface_resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct weston_view *view, *next;

        if (surface->configure) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "surface role already assigned");
                return;
        }

        wl_list_for_each_safe(view, next, &surface->views, surface_link)
                weston_view_destroy(view);
        view = weston_view_create(surface);

        surface->configure = background_configure;
        surface->configure_private = shell;
        surface->output = wl_resource_get_user_data(output_resource);
        view->output = surface->output;
        desktop_shell_send_configure(resource, 0,
                                     surface_resource,
                                     surface->output->width,
                                     surface->output->height);
}

static void
panel_configure(struct weston_surface *es, int32_t sx, int32_t sy)
{
        struct desktop_shell *shell = es->configure_private;
        struct weston_view *view;

        view = container_of(es->views.next, struct weston_view, surface_link);

        configure_static_view(view, &shell->panel_layer);
}

static void
desktop_shell_set_panel(struct wl_client *client,
                        struct wl_resource *resource,
                        struct wl_resource *output_resource,
                        struct wl_resource *surface_resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct weston_view *view, *next;

        if (surface->configure) {
                wl_resource_post_error(surface_resource,
                                       WL_DISPLAY_ERROR_INVALID_OBJECT,
                                       "surface role already assigned");
                return;
        }

        wl_list_for_each_safe(view, next, &surface->views, surface_link)
                weston_view_destroy(view);
        view = weston_view_create(surface);

        surface->configure = panel_configure;
        surface->configure_private = shell;
        surface->output = wl_resource_get_user_data(output_resource);
        view->output = surface->output;
        desktop_shell_send_configure(resource, 0,
                                     surface_resource,
                                     surface->output->width,
                                     surface->output->height);
}

static void
lock_surface_configure(struct weston_surface *surface, int32_t sx, int32_t sy)
{
        struct desktop_shell *shell = surface->configure_private;
        struct weston_view *view;

        view = container_of(surface->views.next, struct weston_view, surface_link);

        if (surface->width == 0)
                return;

        center_on_output(view, get_default_output(shell->compositor));

        if (!weston_surface_is_mapped(surface)) {
                weston_layer_entry_insert(&shell->lock_layer.view_list,
                                          &view->layer_link);
                weston_view_update_transform(view);
                shell_fade(shell, FADE_IN);
        }
}

static void
handle_lock_surface_destroy(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell =
            container_of(listener, struct desktop_shell, lock_surface_listener);

        weston_log("lock surface gone\n");
        shell->lock_surface = NULL;
}

static void
desktop_shell_set_lock_surface(struct wl_client *client,
                               struct wl_resource *resource,
                               struct wl_resource *surface_resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);

        shell->prepare_event_sent = false;

        if (!shell->locked)
                return;

        shell->lock_surface = surface;

        shell->lock_surface_listener.notify = handle_lock_surface_destroy;
        wl_signal_add(&surface->destroy_signal,
                      &shell->lock_surface_listener);

        weston_view_create(surface);
        surface->configure = lock_surface_configure;
        surface->configure_private = shell;
}

static void
resume_desktop(struct desktop_shell *shell)
{
        struct workspace *ws = get_current_workspace(shell);

        terminate_screensaver(shell);

        wl_list_remove(&shell->lock_layer.link);
        if (shell->showing_input_panels) {
                wl_list_insert(&shell->compositor->cursor_layer.link,
                               &shell->input_panel_layer.link);
                wl_list_insert(&shell->input_panel_layer.link,
                               &shell->fullscreen_layer.link);
        } else {
                wl_list_insert(&shell->compositor->cursor_layer.link,
                               &shell->fullscreen_layer.link);
        }
        wl_list_insert(&shell->fullscreen_layer.link,
                       &shell->panel_layer.link);
        wl_list_insert(&shell->panel_layer.link,
                       &ws->layer.link),

        restore_focus_state(shell, get_current_workspace(shell));

        shell->locked = false;
        shell_fade(shell, FADE_IN);
        weston_compositor_damage_all(shell->compositor);
}

static void
desktop_shell_unlock(struct wl_client *client,
                     struct wl_resource *resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        shell->prepare_event_sent = false;

        if (shell->locked)
                resume_desktop(shell);
}

static void
desktop_shell_set_grab_surface(struct wl_client *client,
                               struct wl_resource *resource,
                               struct wl_resource *surface_resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        shell->grab_surface = wl_resource_get_user_data(surface_resource);
        weston_view_create(shell->grab_surface);
}

static void
desktop_shell_desktop_ready(struct wl_client *client,
                            struct wl_resource *resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        shell_fade_startup(shell);
}

static void
desktop_shell_set_panel_position(struct wl_client *client,
                                 struct wl_resource *resource,
                                 uint32_t position)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        if (position != DESKTOP_SHELL_PANEL_POSITION_TOP &&
            position != DESKTOP_SHELL_PANEL_POSITION_BOTTOM &&
            position != DESKTOP_SHELL_PANEL_POSITION_LEFT &&
            position != DESKTOP_SHELL_PANEL_POSITION_RIGHT) {
                wl_resource_post_error(resource,
                                       DESKTOP_SHELL_ERROR_INVALID_ARGUMENT,
                                       "bad position argument");
                return;
        }

        shell->panel_position = position;
}

static const struct desktop_shell_interface desktop_shell_implementation = {
        desktop_shell_set_background,
        desktop_shell_set_panel,
        desktop_shell_set_lock_surface,
        desktop_shell_unlock,
        desktop_shell_set_grab_surface,
        desktop_shell_desktop_ready,
        desktop_shell_set_panel_position
};

static enum shell_surface_type
get_shell_surface_type(struct weston_surface *surface)
{
        struct shell_surface *shsurf;

        shsurf = get_shell_surface(surface);
        if (!shsurf)
                return SHELL_SURFACE_NONE;
        return shsurf->type;
}

static void
move_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void *data)
{
        struct weston_surface *focus;
        struct weston_surface *surface;
        struct shell_surface *shsurf;

        if (seat->pointer->focus == NULL)
                return;

        focus = seat->pointer->focus->surface;

        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (shsurf == NULL || shsurf->state.fullscreen ||
            shsurf->state.maximized)
                return;

        surface_move(shsurf, (struct weston_seat *) seat, 0);
}

static void
maximize_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void *data)
{
        struct weston_surface *focus = seat->keyboard->focus;
        struct weston_surface *surface;
        struct shell_surface *shsurf;

        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (shsurf == NULL)
                return;

        if (!shell_surface_is_xdg_surface(shsurf))
                return;

        shsurf->state_requested = true;
        shsurf->requested_state.maximized = !shsurf->state.maximized;
        send_configure_for_surface(shsurf);
}

static void
fullscreen_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void *data)
{
        struct weston_surface *focus = seat->keyboard->focus;
        struct weston_surface *surface;
        struct shell_surface *shsurf;

        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (shsurf == NULL)
                return;

        if (!shell_surface_is_xdg_surface(shsurf))
                return;

        shsurf->state_requested = true;
        shsurf->requested_state.fullscreen = !shsurf->state.fullscreen;
        shsurf->fullscreen_output = shsurf->output;
        send_configure_for_surface(shsurf);
}

static void
touch_move_binding(struct weston_seat *seat, uint32_t time, void *data)
{
        struct weston_surface *focus;
        struct weston_surface *surface;
        struct shell_surface *shsurf;

        if (seat->touch->focus == NULL)
                return;

        focus = seat->touch->focus->surface;
        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (shsurf == NULL || shsurf->state.fullscreen ||
            shsurf->state.maximized)
                return;

        surface_touch_move(shsurf, (struct weston_seat *) seat);
}

static void
resize_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void *data)
{
        struct weston_surface *focus;
        struct weston_surface *surface;
        uint32_t edges = 0;
        int32_t x, y;
        struct shell_surface *shsurf;

        if (seat->pointer->focus == NULL)
                return;

        focus = seat->pointer->focus->surface;

        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (shsurf == NULL || shsurf->state.fullscreen ||
            shsurf->state.maximized)
                return;

        weston_view_from_global(shsurf->view,
                                wl_fixed_to_int(seat->pointer->grab_x),
                                wl_fixed_to_int(seat->pointer->grab_y),
                                &x, &y);

        if (x < shsurf->surface->width / 3)
                edges |= WL_SHELL_SURFACE_RESIZE_LEFT;
        else if (x < 2 * shsurf->surface->width / 3)
                edges |= 0;
        else
                edges |= WL_SHELL_SURFACE_RESIZE_RIGHT;

        if (y < shsurf->surface->height / 3)
                edges |= WL_SHELL_SURFACE_RESIZE_TOP;
        else if (y < 2 * shsurf->surface->height / 3)
                edges |= 0;
        else
                edges |= WL_SHELL_SURFACE_RESIZE_BOTTOM;

        surface_resize(shsurf, (struct weston_seat *) seat, edges);
}

static void
surface_opacity_binding(struct weston_seat *seat, uint32_t time, uint32_t axis,
                        wl_fixed_t value, void *data)
{
        float step = 0.005;
        struct shell_surface *shsurf;
        struct weston_surface *focus = seat->pointer->focus->surface;
        struct weston_surface *surface;

        /* XXX: broken for windows containing sub-surfaces */
        surface = weston_surface_get_main_surface(focus);
        if (surface == NULL)
                return;

        shsurf = get_shell_surface(surface);
        if (!shsurf)
                return;

        shsurf->view->alpha -= wl_fixed_to_double(value) * step;

        if (shsurf->view->alpha > 1.0)
                shsurf->view->alpha = 1.0;
        if (shsurf->view->alpha < step)
                shsurf->view->alpha = step;

        weston_view_geometry_dirty(shsurf->view);
        weston_surface_damage(surface);
}

static void
do_zoom(struct weston_seat *seat, uint32_t time, uint32_t key, uint32_t axis,
        wl_fixed_t value)
{
        struct weston_seat *ws = (struct weston_seat *) seat;
        struct weston_compositor *compositor = ws->compositor;
        struct weston_output *output;
        float increment;

        wl_list_for_each(output, &compositor->output_list, link) {
                if (pixman_region32_contains_point(&output->region,
                                                   wl_fixed_to_double(seat->pointer->x),
                                                   wl_fixed_to_double(seat->pointer->y),
                                                   NULL)) {
                        if (key == KEY_PAGEUP)
                                increment = output->zoom.increment;
                        else if (key == KEY_PAGEDOWN)
                                increment = -output->zoom.increment;
                        else if (axis == WL_POINTER_AXIS_VERTICAL_SCROLL)
                                /* For every pixel zoom 20th of a step */
                                increment = output->zoom.increment *
                                            -wl_fixed_to_double(value) / 20.0;
                        else
                                increment = 0;

                        output->zoom.level += increment;

                        if (output->zoom.level < 0.0)
                                output->zoom.level = 0.0;
                        else if (output->zoom.level > output->zoom.max_level)
                                output->zoom.level = output->zoom.max_level;
                        else if (!output->zoom.active) {
                                weston_output_activate_zoom(output);
                        }

                        output->zoom.spring_z.target = output->zoom.level;

                        weston_output_update_zoom(output);
                }
        }
}

static void
zoom_axis_binding(struct weston_seat *seat, uint32_t time, uint32_t axis,
                  wl_fixed_t value, void *data)
{
        do_zoom(seat, time, 0, axis, value);
}

static void
zoom_key_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
                 void *data)
{
        do_zoom(seat, time, key, 0, 0);
}

static void
terminate_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
                  void *data)
{
        struct weston_compositor *compositor = data;

        wl_display_terminate(compositor->wl_display);
}

static void
rotate_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
                   wl_fixed_t x, wl_fixed_t y)
{
        struct rotate_grab *rotate =
                container_of(grab, struct rotate_grab, base.grab);
        struct weston_pointer *pointer = grab->pointer;
        struct shell_surface *shsurf = rotate->base.shsurf;
        float cx, cy, dx, dy, cposx, cposy, dposx, dposy, r;

        weston_pointer_move(pointer, x, y);

        if (!shsurf)
                return;

        cx = 0.5f * shsurf->surface->width;
        cy = 0.5f * shsurf->surface->height;

        dx = wl_fixed_to_double(pointer->x) - rotate->center.x;
        dy = wl_fixed_to_double(pointer->y) - rotate->center.y;
        r = sqrtf(dx * dx + dy * dy);

        wl_list_remove(&shsurf->rotation.transform.link);
        weston_view_geometry_dirty(shsurf->view);

        if (r > 20.0f) {
                struct weston_matrix *matrix =
                        &shsurf->rotation.transform.matrix;

                weston_matrix_init(&rotate->rotation);
                weston_matrix_rotate_xy(&rotate->rotation, dx / r, dy / r);

                weston_matrix_init(matrix);
                weston_matrix_translate(matrix, -cx, -cy, 0.0f);
                weston_matrix_multiply(matrix, &shsurf->rotation.rotation);
                weston_matrix_multiply(matrix, &rotate->rotation);
                weston_matrix_translate(matrix, cx, cy, 0.0f);

                wl_list_insert(
                        &shsurf->view->geometry.transformation_list,
                        &shsurf->rotation.transform.link);
        } else {
                wl_list_init(&shsurf->rotation.transform.link);
                weston_matrix_init(&shsurf->rotation.rotation);
                weston_matrix_init(&rotate->rotation);
        }

        /* We need to adjust the position of the surface
         * in case it was resized in a rotated state before */
        cposx = shsurf->view->geometry.x + cx;
        cposy = shsurf->view->geometry.y + cy;
        dposx = rotate->center.x - cposx;
        dposy = rotate->center.y - cposy;
        if (dposx != 0.0f || dposy != 0.0f) {
                weston_view_set_position(shsurf->view,
                                         shsurf->view->geometry.x + dposx,
                                         shsurf->view->geometry.y + dposy);
        }

        /* Repaint implies weston_surface_update_transform(), which
         * lazily applies the damage due to rotation update.
         */
        weston_compositor_schedule_repaint(shsurf->surface->compositor);
}

static void
rotate_grab_button(struct weston_pointer_grab *grab,
                   uint32_t time, uint32_t button, uint32_t state_w)
{
        struct rotate_grab *rotate =
                container_of(grab, struct rotate_grab, base.grab);
        struct weston_pointer *pointer = grab->pointer;
        struct shell_surface *shsurf = rotate->base.shsurf;
        enum wl_pointer_button_state state = state_w;

        if (pointer->button_count == 0 &&
            state == WL_POINTER_BUTTON_STATE_RELEASED) {
                if (shsurf)
                        weston_matrix_multiply(&shsurf->rotation.rotation,
                                               &rotate->rotation);
                shell_grab_end(&rotate->base);
                free(rotate);
        }
}

static void
rotate_grab_cancel(struct weston_pointer_grab *grab)
{
        struct rotate_grab *rotate =
                container_of(grab, struct rotate_grab, base.grab);

        shell_grab_end(&rotate->base);
        free(rotate);
}

static const struct weston_pointer_grab_interface rotate_grab_interface = {
        noop_grab_focus,
        rotate_grab_motion,
        rotate_grab_button,
        rotate_grab_cancel,
};

static void
surface_rotate(struct shell_surface *surface, struct weston_seat *seat)
{
        struct rotate_grab *rotate;
        float dx, dy;
        float r;

        rotate = malloc(sizeof *rotate);
        if (!rotate)
                return;

        weston_view_to_global_float(surface->view,
                                    surface->surface->width * 0.5f,
                                    surface->surface->height * 0.5f,
                                    &rotate->center.x, &rotate->center.y);

        dx = wl_fixed_to_double(seat->pointer->x) - rotate->center.x;
        dy = wl_fixed_to_double(seat->pointer->y) - rotate->center.y;
        r = sqrtf(dx * dx + dy * dy);
        if (r > 20.0f) {
                struct weston_matrix inverse;

                weston_matrix_init(&inverse);
                weston_matrix_rotate_xy(&inverse, dx / r, -dy / r);
                weston_matrix_multiply(&surface->rotation.rotation, &inverse);

                weston_matrix_init(&rotate->rotation);
                weston_matrix_rotate_xy(&rotate->rotation, dx / r, dy / r);
        } else {
                weston_matrix_init(&surface->rotation.rotation);
                weston_matrix_init(&rotate->rotation);
        }

        shell_grab_start(&rotate->base, &rotate_grab_interface, surface,
                         seat->pointer, DESKTOP_SHELL_CURSOR_ARROW);
}

static void
rotate_binding(struct weston_seat *seat, uint32_t time, uint32_t button,
               void *data)
{
        struct weston_surface *focus;
        struct weston_surface *base_surface;
        struct shell_surface *surface;

        if (seat->pointer->focus == NULL)
                return;

        focus = seat->pointer->focus->surface;

        base_surface = weston_surface_get_main_surface(focus);
        if (base_surface == NULL)
                return;

        surface = get_shell_surface(base_surface);
        if (surface == NULL || surface->state.fullscreen ||
            surface->state.maximized)
                return;

        surface_rotate(surface, seat);
}

/* Move all fullscreen layers down to the current workspace and hide their
 * black views. The surfaces' state is set to both fullscreen and lowered,
 * and this is reversed when such a surface is re-configured, see
 * shell_configure_fullscreen() and shell_ensure_fullscreen_black_view().
 *
 * This should be used when implementing shell-wide overlays, such as
 * the alt-tab switcher, which need to de-promote fullscreen layers. */
void
lower_fullscreen_layer(struct desktop_shell *shell)
{
        struct workspace *ws;
        struct weston_view *view, *prev;

        ws = get_current_workspace(shell);
        wl_list_for_each_reverse_safe(view, prev,
                                      &shell->fullscreen_layer.view_list.link,
                                      layer_link.link) {
                struct shell_surface *shsurf = get_shell_surface(view->surface);

                if (!shsurf)
                        continue;

                /* We can have a non-fullscreen popup for a fullscreen surface
                 * in the fullscreen layer. */
                if (shsurf->state.fullscreen) {
                        /* Hide the black view */
                        weston_layer_entry_remove(&shsurf->fullscreen.black_view->layer_link);
                        wl_list_init(&shsurf->fullscreen.black_view->layer_link.link);
                        weston_view_damage_below(shsurf->fullscreen.black_view);

                }

                /* Lower the view to the workspace layer */
                weston_layer_entry_remove(&view->layer_link);
                weston_layer_entry_insert(&ws->layer.view_list, &view->layer_link);
                weston_view_damage_below(view);
                weston_surface_damage(view->surface);

                shsurf->state.lowered = true;
        }
}

void
activate(struct desktop_shell *shell, struct weston_surface *es,
         struct weston_seat *seat, bool configure)
{
        struct weston_surface *main_surface;
        struct focus_state *state;
        struct workspace *ws;
        struct weston_surface *old_es;
        struct shell_surface *shsurf;

        lower_fullscreen_layer(shell);

        main_surface = weston_surface_get_main_surface(es);

        weston_surface_activate(es, seat);

        state = ensure_focus_state(shell, seat);
        if (state == NULL)
                return;

        old_es = state->keyboard_focus;
        focus_state_set_focus(state, es);

        shsurf = get_shell_surface(main_surface);
        assert(shsurf);

        if (shsurf->state.fullscreen && configure)
                shell_configure_fullscreen(shsurf);
        else
                restore_all_output_modes(shell->compositor);

        /* Update the surface’s layer. This brings it to the top of the stacking
         * order as appropriate. */
        shell_surface_update_layer(shsurf);

        if (shell->focus_animation_type != ANIMATION_NONE) {
                ws = get_current_workspace(shell);
                animate_focus_change(shell, ws, get_default_view(old_es), get_default_view(es));
        }
}

/* no-op func for checking black surface */
static void
black_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy)
{
}

static bool
is_black_surface (struct weston_surface *es, struct weston_surface **fs_surface)
{
        if (es->configure == black_surface_configure) {
                if (fs_surface)
                        *fs_surface = (struct weston_surface *)es->configure_private;
                return true;
        }
        return false;
}

static void
activate_binding(struct weston_seat *seat,
                 struct desktop_shell *shell,
                 struct weston_surface *focus)
{
        struct weston_surface *main_surface;

        if (!focus)
                return;

        if (is_black_surface(focus, &main_surface))
                focus = main_surface;

        main_surface = weston_surface_get_main_surface(focus);
        if (get_shell_surface_type(main_surface) == SHELL_SURFACE_NONE)
                return;

        activate(shell, focus, seat, true);
}

static void
click_to_activate_binding(struct weston_seat *seat, uint32_t time, uint32_t button,
                          void *data)
{
        if (seat->pointer->grab != &seat->pointer->default_grab)
                return;
        if (seat->pointer->focus == NULL)
                return;

        activate_binding(seat, data, seat->pointer->focus->surface);
}

static void
touch_to_activate_binding(struct weston_seat *seat, uint32_t time, void *data)
{
        if (seat->touch->grab != &seat->touch->default_grab)
                return;
        if (seat->touch->focus == NULL)
                return;

        activate_binding(seat, data, seat->touch->focus->surface);
}

static void
unfocus_all_seats(struct desktop_shell *shell)
{
        struct weston_seat *seat, *next;

        wl_list_for_each_safe(seat, next, &shell->compositor->seat_list, link) {
                if (seat->keyboard == NULL)
                        continue;

                weston_keyboard_set_focus(seat->keyboard, NULL);
        }
}

static void
lock(struct desktop_shell *shell)
{
        struct workspace *ws = get_current_workspace(shell);

        if (shell->locked) {
                weston_compositor_sleep(shell->compositor);
                return;
        }

        shell->locked = true;

        /* Hide all surfaces by removing the fullscreen, panel and
         * toplevel layers.  This way nothing else can show or receive
         * input events while we are locked. */

        wl_list_remove(&shell->panel_layer.link);
        wl_list_remove(&shell->fullscreen_layer.link);
        if (shell->showing_input_panels)
                wl_list_remove(&shell->input_panel_layer.link);
        wl_list_remove(&ws->layer.link);
        wl_list_insert(&shell->compositor->cursor_layer.link,
                       &shell->lock_layer.link);

        launch_screensaver(shell);

        /* Remove the keyboard focus on all seats. This will be
         * restored to the workspace's saved state via
         * restore_focus_state when the compositor is unlocked */
        unfocus_all_seats(shell);

        /* TODO: disable bindings that should not work while locked. */

        /* All this must be undone in resume_desktop(). */
}

static void
unlock(struct desktop_shell *shell)
{
        if (!shell->locked || shell->lock_surface) {
                shell_fade(shell, FADE_IN);
                return;
        }

        /* If desktop-shell client has gone away, unlock immediately. */
        if (!shell->child.desktop_shell) {
                resume_desktop(shell);
                return;
        }

        if (shell->prepare_event_sent)
                return;

        desktop_shell_send_prepare_lock_surface(shell->child.desktop_shell);
        shell->prepare_event_sent = true;
}

static void
shell_fade_done(struct weston_view_animation *animation, void *data)
{
        struct desktop_shell *shell = data;

        shell->fade.animation = NULL;

        switch (shell->fade.type) {
        case FADE_IN:
                weston_surface_destroy(shell->fade.view->surface);
                shell->fade.view = NULL;
                break;
        case FADE_OUT:
                lock(shell);
                break;
        default:
                break;
        }
}

static struct weston_view *
shell_fade_create_surface(struct desktop_shell *shell)
{
        struct weston_compositor *compositor = shell->compositor;
        struct weston_surface *surface;
        struct weston_view *view;

        surface = weston_surface_create(compositor);
        if (!surface)
                return NULL;

        view = weston_view_create(surface);
        if (!view) {
                weston_surface_destroy(surface);
                return NULL;
        }

        weston_surface_set_size(surface, 8192, 8192);
        weston_view_set_position(view, 0, 0);
        weston_surface_set_color(surface, 0.0, 0.0, 0.0, 1.0);
        weston_layer_entry_insert(&compositor->fade_layer.view_list,
                                  &view->layer_link);
        pixman_region32_init(&surface->input);

        return view;
}

static void
shell_fade(struct desktop_shell *shell, enum fade_type type)
{
        float tint;

        switch (type) {
        case FADE_IN:
                tint = 0.0;
                break;
        case FADE_OUT:
                tint = 1.0;
                break;
        default:
                weston_log("shell: invalid fade type\n");
                return;
        }

        shell->fade.type = type;

        if (shell->fade.view == NULL) {
                shell->fade.view = shell_fade_create_surface(shell);
                if (!shell->fade.view)
                        return;

                shell->fade.view->alpha = 1.0 - tint;
                weston_view_update_transform(shell->fade.view);
        }

        if (shell->fade.view->output == NULL) {
                /* If the black view gets a NULL output, we lost the
                 * last output and we'll just cancel the fade.  This
                 * happens when you close the last window under the
                 * X11 or Wayland backends. */
                shell->locked = false;
                weston_surface_destroy(shell->fade.view->surface);
                shell->fade.view = NULL;
        } else if (shell->fade.animation) {
                weston_fade_update(shell->fade.animation, tint);
        } else {
                shell->fade.animation =
                        weston_fade_run(shell->fade.view,
                                        1.0 - tint, tint, 300.0,
                                        shell_fade_done, shell);
        }
}

static void
do_shell_fade_startup(void *data)
{
        struct desktop_shell *shell = data;

        if (shell->startup_animation_type == ANIMATION_FADE)
                shell_fade(shell, FADE_IN);
        else if (shell->startup_animation_type == ANIMATION_NONE) {
                weston_surface_destroy(shell->fade.view->surface);
                shell->fade.view = NULL;
        }
}

static void
shell_fade_startup(struct desktop_shell *shell)
{
        struct wl_event_loop *loop;

        if (!shell->fade.startup_timer)
                return;

        wl_event_source_remove(shell->fade.startup_timer);
        shell->fade.startup_timer = NULL;

        loop = wl_display_get_event_loop(shell->compositor->wl_display);
        wl_event_loop_add_idle(loop, do_shell_fade_startup, shell);
}

static int
fade_startup_timeout(void *data)
{
        struct desktop_shell *shell = data;

        shell_fade_startup(shell);
        return 0;
}

static void
shell_fade_init(struct desktop_shell *shell)
{
        /* Make compositor output all black, and wait for the desktop-shell
         * client to signal it is ready, then fade in. The timer triggers a
         * fade-in, in case the desktop-shell client takes too long.
         */

        struct wl_event_loop *loop;

        if (shell->fade.view != NULL) {
                weston_log("%s: warning: fade surface already exists\n",
                           __func__);
                return;
        }

        shell->fade.view = shell_fade_create_surface(shell);
        if (!shell->fade.view)
                return;

        weston_view_update_transform(shell->fade.view);
        weston_surface_damage(shell->fade.view->surface);

        loop = wl_display_get_event_loop(shell->compositor->wl_display);
        shell->fade.startup_timer =
                wl_event_loop_add_timer(loop, fade_startup_timeout, shell);
        wl_event_source_timer_update(shell->fade.startup_timer, 15000);
}

static void
idle_handler(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell =
                container_of(listener, struct desktop_shell, idle_listener);
        struct weston_seat *seat;

        wl_list_for_each(seat, &shell->compositor->seat_list, link) {
                if (seat->pointer)
                        popup_grab_end(seat->pointer);
                if (seat->touch)
                        touch_popup_grab_end(seat->touch);
        }

        shell_fade(shell, FADE_OUT);
        /* lock() is called from shell_fade_done() */
}

static void
wake_handler(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell =
                container_of(listener, struct desktop_shell, wake_listener);

        unlock(shell);
}

static void
center_on_output(struct weston_view *view, struct weston_output *output)
{
        int32_t surf_x, surf_y, width, height;
        float x, y;

        surface_subsurfaces_boundingbox(view->surface, &surf_x, &surf_y, &width, &height);

        x = output->x + (output->width - width) / 2 - surf_x / 2;
        y = output->y + (output->height - height) / 2 - surf_y / 2;

        weston_view_set_position(view, x, y);
}

static void
weston_view_set_initial_position(struct weston_view *view,
                                 struct desktop_shell *shell)
{
        struct weston_compositor *compositor = shell->compositor;
        int ix = 0, iy = 0;
        int32_t range_x, range_y;
        int32_t dx, dy, x, y;
        struct weston_output *output, *target_output = NULL;
        struct weston_seat *seat;
        pixman_rectangle32_t area;

        /* As a heuristic place the new window on the same output as the
         * pointer. Falling back to the output containing 0, 0.
         *
         * TODO: Do something clever for touch too?
         */
        wl_list_for_each(seat, &compositor->seat_list, link) {
                if (seat->pointer) {
                        ix = wl_fixed_to_int(seat->pointer->x);
                        iy = wl_fixed_to_int(seat->pointer->y);
                        break;
                }
        }

        wl_list_for_each(output, &compositor->output_list, link) {
                if (pixman_region32_contains_point(&output->region, ix, iy, NULL)) {
                        target_output = output;
                        break;
                }
        }

        if (!target_output) {
                weston_view_set_position(view, 10 + random() % 400,
                                         10 + random() % 400);
                return;
        }

        /* Valid range within output where the surface will still be onscreen.
         * If this is negative it means that the surface is bigger than
         * output.
         */
        get_output_work_area(shell, target_output, &area);

        dx = area.x;
        dy = area.y;
        range_x = area.width - view->surface->width;
        range_y = area.height - view->surface->height;

        if (range_x > 0)
                dx += random() % range_x;

        if (range_y > 0)
                dy += random() % range_y;

        x = target_output->x + dx;
        y = target_output->y + dy;

        weston_view_set_position(view, x, y);
}

static void
set_maximized_position(struct desktop_shell *shell,
                       struct shell_surface *shsurf)
{
        int32_t surf_x, surf_y;
        pixman_rectangle32_t area;

        /* use surface configure to set the geometry */
        get_output_work_area(shell, shsurf->output, &area);
        surface_subsurfaces_boundingbox(shsurf->surface,
                                        &surf_x, &surf_y, NULL, NULL);

        weston_view_set_position(shsurf->view,
                                 area.x - surf_x,
                                 area.y - surf_y);
}

static void
map(struct desktop_shell *shell, struct shell_surface *shsurf,
    int32_t sx, int32_t sy)
{
        struct weston_compositor *compositor = shell->compositor;
        struct weston_seat *seat;

        /* initial positioning, see also configure() */
        switch (shsurf->type) {
        case SHELL_SURFACE_TOPLEVEL:
                if (shsurf->state.fullscreen) {
                        center_on_output(shsurf->view, shsurf->fullscreen_output);
                        shell_map_fullscreen(shsurf);
                } else if (shsurf->state.maximized) {
                        set_maximized_position(shell, shsurf);
                } else if (!shsurf->state.relative) {
                        weston_view_set_initial_position(shsurf->view, shell);
                }
                break;
        case SHELL_SURFACE_POPUP:
                shell_map_popup(shsurf);
                break;
        case SHELL_SURFACE_NONE:
                weston_view_set_position(shsurf->view,
                                         shsurf->view->geometry.x + sx,
                                         shsurf->view->geometry.y + sy);
                break;
        case SHELL_SURFACE_XWAYLAND:
        default:
                ;
        }

        /* Surface stacking order, see also activate(). */
        shell_surface_update_layer(shsurf);

        if (shsurf->type != SHELL_SURFACE_NONE) {
                weston_view_update_transform(shsurf->view);
                if (shsurf->state.maximized) {
                        shsurf->surface->output = shsurf->output;
                        shsurf->view->output = shsurf->output;
                }
        }

        switch (shsurf->type) {
        /* XXX: xwayland's using the same fields for transient type */
        case SHELL_SURFACE_XWAYLAND:
                if (shsurf->transient.flags ==
                                WL_SHELL_SURFACE_TRANSIENT_INACTIVE)
                        break;
        case SHELL_SURFACE_TOPLEVEL:
                if (shsurf->state.relative &&
                    shsurf->transient.flags == WL_SHELL_SURFACE_TRANSIENT_INACTIVE)
                        break;
                if (shell->locked)
                        break;
                wl_list_for_each(seat, &compositor->seat_list, link)
                        activate(shell, shsurf->surface, seat, true);
                break;
        case SHELL_SURFACE_POPUP:
        case SHELL_SURFACE_NONE:
        default:
                break;
        }

        if (shsurf->type == SHELL_SURFACE_TOPLEVEL &&
            !shsurf->state.maximized && !shsurf->state.fullscreen)
        {
                switch (shell->win_animation_type) {
                case ANIMATION_FADE:
                        weston_fade_run(shsurf->view, 0.0, 1.0, 300.0, NULL, NULL);
                        break;
                case ANIMATION_ZOOM:
                        weston_zoom_run(shsurf->view, 0.5, 1.0, NULL, NULL);
                        break;
                case ANIMATION_NONE:
                default:
                        break;
                }
        }
}

static void
configure(struct desktop_shell *shell, struct weston_surface *surface,
          float x, float y)
{
        struct shell_surface *shsurf;
        struct weston_view *view;

        shsurf = get_shell_surface(surface);

        assert(shsurf);

        if (shsurf->state.fullscreen)
                shell_configure_fullscreen(shsurf);
        else if (shsurf->state.maximized) {
                set_maximized_position(shell, shsurf);
        } else {
                weston_view_set_position(shsurf->view, x, y);
        }

        /* XXX: would a fullscreen surface need the same handling? */
        if (surface->output) {
                wl_list_for_each(view, &surface->views, surface_link)
                        weston_view_update_transform(view);

                if (shsurf->state.maximized)
                        surface->output = shsurf->output;
        }
}

static void
shell_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy)
{
        struct shell_surface *shsurf = get_shell_surface(es);
        struct desktop_shell *shell;
        int type_changed = 0;

        assert(shsurf);

        shell = shsurf->shell;

        if (!weston_surface_is_mapped(es) &&
            !wl_list_empty(&shsurf->popup.grab_link)) {
                remove_popup_grab(shsurf);
        }

        if (es->width == 0)
                return;

        if (shsurf->has_next_geometry) {
                shsurf->geometry = shsurf->next_geometry;
                shsurf->has_next_geometry = false;
                shsurf->has_set_geometry = true;
        } else if (!shsurf->has_set_geometry) {
                surface_subsurfaces_boundingbox(shsurf->surface,
                                                &shsurf->geometry.x,
                                                &shsurf->geometry.y,
                                                &shsurf->geometry.width,
                                                &shsurf->geometry.height);
        }

        if (shsurf->state_changed) {
                set_surface_type(shsurf);
                type_changed = 1;
        }

        if (!weston_surface_is_mapped(es)) {
                map(shell, shsurf, sx, sy);
        } else if (type_changed || sx != 0 || sy != 0 ||
                   shsurf->last_width != es->width ||
                   shsurf->last_height != es->height) {
                float from_x, from_y;
                float to_x, to_y;

                if (shsurf->resize_edges) {
                        sx = 0;
                        sy = 0;
                }

                if (shsurf->resize_edges & WL_SHELL_SURFACE_RESIZE_LEFT)
                        sx = shsurf->last_width - es->width;
                if (shsurf->resize_edges & WL_SHELL_SURFACE_RESIZE_TOP)
                        sy = shsurf->last_height - es->height;

                shsurf->last_width = es->width;
                shsurf->last_height = es->height;

                weston_view_to_global_float(shsurf->view, 0, 0, &from_x, &from_y);
                weston_view_to_global_float(shsurf->view, sx, sy, &to_x, &to_y);
                configure(shell, es,
                          shsurf->view->geometry.x + to_x - from_x,
                          shsurf->view->geometry.y + to_y - from_y);
        }
}

static bool
check_desktop_shell_crash_too_early(struct desktop_shell *shell)
{
        struct timespec now;

        if (clock_gettime(CLOCK_MONOTONIC, &now) < 0)
                return false;

        /*
         * If the shell helper client dies before the session has been
         * up for roughly 30 seconds, better just make Weston shut down,
         * because the user likely has no way to interact with the desktop
         * anyway.
         */
        if (now.tv_sec - shell->startup_time.tv_sec < 30) {
                weston_log("Error: %s apparently cannot run at all.\n",
                           shell->client);
                weston_log_continue(STAMP_SPACE "Quitting...");
                wl_display_terminate(shell->compositor->wl_display);

                return true;
        }

        return false;
}

static void launch_desktop_shell_process(void *data);

static void
respawn_desktop_shell_process(struct desktop_shell *shell)
{
        uint32_t time;

        /* if desktop-shell dies more than 5 times in 30 seconds, give up */
        time = weston_compositor_get_time();
        if (time - shell->child.deathstamp > 30000) {
                shell->child.deathstamp = time;
                shell->child.deathcount = 0;
        }

        shell->child.deathcount++;
        if (shell->child.deathcount > 5) {
                weston_log("%s disconnected, giving up.\n", shell->client);
                return;
        }

        weston_log("%s disconnected, respawning...\n", shell->client);
        launch_desktop_shell_process(shell);
}

static void
desktop_shell_client_destroy(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell;

        shell = container_of(listener, struct desktop_shell,
                             child.client_destroy_listener);

        wl_list_remove(&shell->child.client_destroy_listener.link);
        shell->child.client = NULL;
        /*
         * unbind_desktop_shell() will reset shell->child.desktop_shell
         * before the respawned process has a chance to create a new
         * desktop_shell object, because we are being called from the
         * wl_client destructor which destroys all wl_resources before
         * returning.
         */

        if (!check_desktop_shell_crash_too_early(shell))
                respawn_desktop_shell_process(shell);

        shell_fade_startup(shell);
}

static void
launch_desktop_shell_process(void *data)
{
        struct desktop_shell *shell = data;

        shell->child.client = weston_client_start(shell->compositor,
                                                  shell->client);

        if (!shell->child.client) {
                weston_log("not able to start %s\n", shell->client);
                return;
        }

        shell->child.client_destroy_listener.notify =
                desktop_shell_client_destroy;
        wl_client_add_destroy_listener(shell->child.client,
                                       &shell->child.client_destroy_listener);
}

static void
handle_shell_client_destroy(struct wl_listener *listener, void *data)
{
        struct shell_client *sc =
                container_of(listener, struct shell_client, destroy_listener);

        if (sc->ping_timer)
                wl_event_source_remove(sc->ping_timer);
        free(sc);
}

static struct shell_client *
shell_client_create(struct wl_client *client, struct desktop_shell *shell,
                    const struct wl_interface *interface, uint32_t id)
{
        struct shell_client *sc;

        sc = zalloc(sizeof *sc);
        if (sc == NULL) {
                wl_client_post_no_memory(client);
                return NULL;
        }

        sc->resource = wl_resource_create(client, interface, 1, id);
        if (sc->resource == NULL) {
                free(sc);
                wl_client_post_no_memory(client);
                return NULL;
        }

        sc->client = client;
        sc->shell = shell;
        sc->destroy_listener.notify = handle_shell_client_destroy;
        wl_client_add_destroy_listener(client, &sc->destroy_listener);

        return sc;
}

static void
bind_shell(struct wl_client *client, void *data, uint32_t version, uint32_t id)
{
        struct desktop_shell *shell = data;
        struct shell_client *sc;

        sc = shell_client_create(client, shell, &wl_shell_interface, id);
        if (sc)
                wl_resource_set_implementation(sc->resource,
                                               &shell_implementation,
                                               sc, NULL);
}

static void
bind_xdg_shell(struct wl_client *client, void *data, uint32_t version, uint32_t id)
{
        struct desktop_shell *shell = data;
        struct shell_client *sc;

        sc = shell_client_create(client, shell, &xdg_shell_interface, id);
        if (sc)
                wl_resource_set_dispatcher(sc->resource,
                                           xdg_shell_unversioned_dispatch,
                                           NULL, sc, NULL);
}

static void
unbind_desktop_shell(struct wl_resource *resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        if (shell->locked)
                resume_desktop(shell);

        shell->child.desktop_shell = NULL;
        shell->prepare_event_sent = false;
}

static void
bind_desktop_shell(struct wl_client *client,
                   void *data, uint32_t version, uint32_t id)
{
        struct desktop_shell *shell = data;
        struct wl_resource *resource;

        resource = wl_resource_create(client, &desktop_shell_interface,
                                      MIN(version, 3), id);

        if (client == shell->child.client) {
                wl_resource_set_implementation(resource,
                                               &desktop_shell_implementation,
                                               shell, unbind_desktop_shell);
                shell->child.desktop_shell = resource;

                if (version < 2)
                        shell_fade_startup(shell);

                return;
        }

        wl_resource_post_error(resource, WL_DISPLAY_ERROR_INVALID_OBJECT,
                               "permission to bind desktop_shell denied");
}

static void
screensaver_configure(struct weston_surface *surface, int32_t sx, int32_t sy)
{
        struct desktop_shell *shell = surface->configure_private;
        struct weston_view *view;
        struct weston_layer_entry *prev;

        if (surface->width == 0)
                return;

        /* XXX: starting weston-screensaver beforehand does not work */
        if (!shell->locked)
                return;

        view = container_of(surface->views.next, struct weston_view, surface_link);
        center_on_output(view, surface->output);

        if (wl_list_empty(&view->layer_link.link)) {
                prev = container_of(shell->lock_layer.view_list.link.prev,
                                    struct weston_layer_entry, link);
                weston_layer_entry_insert(prev, &view->layer_link);
                weston_view_update_transform(view);
                wl_event_source_timer_update(shell->screensaver.timer,
                                             shell->screensaver.duration);
                shell_fade(shell, FADE_IN);
        }
}

static void
screensaver_set_surface(struct wl_client *client,
                        struct wl_resource *resource,
                        struct wl_resource *surface_resource,
                        struct wl_resource *output_resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);
        struct weston_surface *surface =
                wl_resource_get_user_data(surface_resource);
        struct weston_output *output = wl_resource_get_user_data(output_resource);
        struct weston_view *view, *next;

        /* Make sure we only have one view */
        wl_list_for_each_safe(view, next, &surface->views, surface_link)
                weston_view_destroy(view);
        weston_view_create(surface);

        surface->configure = screensaver_configure;
        surface->configure_private = shell;
        surface->output = output;
}

static const struct screensaver_interface screensaver_implementation = {
        screensaver_set_surface
};

static void
unbind_screensaver(struct wl_resource *resource)
{
        struct desktop_shell *shell = wl_resource_get_user_data(resource);

        shell->screensaver.binding = NULL;
}

static void
bind_screensaver(struct wl_client *client,
                 void *data, uint32_t version, uint32_t id)
{
        struct desktop_shell *shell = data;
        struct wl_resource *resource;

        resource = wl_resource_create(client, &screensaver_interface, 1, id);

        if (shell->screensaver.binding == NULL) {
                wl_resource_set_implementation(resource,
                                               &screensaver_implementation,
                                               shell, unbind_screensaver);
                shell->screensaver.binding = resource;
                return;
        }

        wl_resource_post_error(resource, WL_DISPLAY_ERROR_INVALID_OBJECT,
                               "interface object already bound");
}

struct switcher {
        struct desktop_shell *shell;
        struct weston_surface *current;
        struct wl_listener listener;
        struct weston_keyboard_grab grab;
        struct wl_array minimized_array;
};

static void
switcher_next(struct switcher *switcher)
{
        struct weston_view *view;
        struct weston_surface *first = NULL, *prev = NULL, *next = NULL;
        struct shell_surface *shsurf;
        struct workspace *ws = get_current_workspace(switcher->shell);

         /* temporary re-display minimized surfaces */
        struct weston_view *tmp;
        struct weston_view **minimized;
        wl_list_for_each_safe(view, tmp, &switcher->shell->minimized_layer.view_list.link, layer_link.link) {
                weston_layer_entry_remove(&view->layer_link);
                weston_layer_entry_insert(&ws->layer.view_list, &view->layer_link);
                minimized = wl_array_add(&switcher->minimized_array, sizeof *minimized);
                *minimized = view;
        }

        wl_list_for_each(view, &ws->layer.view_list.link, layer_link.link) {
                shsurf = get_shell_surface(view->surface);
                if (shsurf &&
                    shsurf->type == SHELL_SURFACE_TOPLEVEL &&
                    shsurf->parent == NULL) {
                        if (first == NULL)
                                first = view->surface;
                        if (prev == switcher->current)
                                next = view->surface;
                        prev = view->surface;
                        view->alpha = 0.25;
                        weston_view_geometry_dirty(view);
                        weston_surface_damage(view->surface);
                }

                if (is_black_surface(view->surface, NULL)) {
                        view->alpha = 0.25;
                        weston_view_geometry_dirty(view);
                        weston_surface_damage(view->surface);
                }
        }

        if (next == NULL)
                next = first;

        if (next == NULL)
                return;

        wl_list_remove(&switcher->listener.link);
        wl_signal_add(&next->destroy_signal, &switcher->listener);

        switcher->current = next;
        wl_list_for_each(view, &next->views, surface_link)
                view->alpha = 1.0;

        shsurf = get_shell_surface(switcher->current);
        if (shsurf && shsurf->state.fullscreen)
                shsurf->fullscreen.black_view->alpha = 1.0;
}

static void
switcher_handle_surface_destroy(struct wl_listener *listener, void *data)
{
        struct switcher *switcher =
                container_of(listener, struct switcher, listener);

        switcher_next(switcher);
}

static void
switcher_destroy(struct switcher *switcher)
{
        struct weston_view *view;
        struct weston_keyboard *keyboard = switcher->grab.keyboard;
        struct workspace *ws = get_current_workspace(switcher->shell);

        wl_list_for_each(view, &ws->layer.view_list.link, layer_link.link) {
                if (is_focus_view(view))
                        continue;

                view->alpha = 1.0;
                weston_surface_damage(view->surface);
        }

        if (switcher->current)
                activate(switcher->shell, switcher->current,
                         (struct weston_seat *) keyboard->seat, true);
        wl_list_remove(&switcher->listener.link);
        weston_keyboard_end_grab(keyboard);
        if (keyboard->input_method_resource)
                keyboard->grab = &keyboard->input_method_grab;

         /* re-hide surfaces that were temporary shown during the switch */
        struct weston_view **minimized;
        wl_array_for_each(minimized, &switcher->minimized_array) {
                /* with the exception of the current selected */
                if ((*minimized)->surface != switcher->current) {
                        weston_layer_entry_remove(&(*minimized)->layer_link);
                        weston_layer_entry_insert(&switcher->shell->minimized_layer.view_list, &(*minimized)->layer_link);
                        weston_view_damage_below(*minimized);
                }
        }
        wl_array_release(&switcher->minimized_array);

        free(switcher);
}

static void
switcher_key(struct weston_keyboard_grab *grab,
             uint32_t time, uint32_t key, uint32_t state_w)
{
        struct switcher *switcher = container_of(grab, struct switcher, grab);
        enum wl_keyboard_key_state state = state_w;

        if (key == KEY_TAB && state == WL_KEYBOARD_KEY_STATE_PRESSED)
                switcher_next(switcher);
}

static void
switcher_modifier(struct weston_keyboard_grab *grab, uint32_t serial,
                  uint32_t mods_depressed, uint32_t mods_latched,
                  uint32_t mods_locked, uint32_t group)
{
        struct switcher *switcher = container_of(grab, struct switcher, grab);
        struct weston_seat *seat = (struct weston_seat *) grab->keyboard->seat;

        if ((seat->modifier_state & switcher->shell->binding_modifier) == 0)
                switcher_destroy(switcher);
}

static void
switcher_cancel(struct weston_keyboard_grab *grab)
{
        struct switcher *switcher = container_of(grab, struct switcher, grab);

        switcher_destroy(switcher);
}

static const struct weston_keyboard_grab_interface switcher_grab = {
        switcher_key,
        switcher_modifier,
        switcher_cancel,
};

static void
switcher_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
                 void *data)
{
        struct desktop_shell *shell = data;
        struct switcher *switcher;

        switcher = malloc(sizeof *switcher);
        switcher->shell = shell;
        switcher->current = NULL;
        switcher->listener.notify = switcher_handle_surface_destroy;
        wl_list_init(&switcher->listener.link);
        wl_array_init(&switcher->minimized_array);

        restore_all_output_modes(shell->compositor);
        lower_fullscreen_layer(switcher->shell);
        switcher->grab.interface = &switcher_grab;
        weston_keyboard_start_grab(seat->keyboard, &switcher->grab);
        weston_keyboard_set_focus(seat->keyboard, NULL);
        switcher_next(switcher);
}

static void
backlight_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
                  void *data)
{
        struct weston_compositor *compositor = data;
        struct weston_output *output;
        long backlight_new = 0;

        /* TODO: we're limiting to simple use cases, where we assume just
         * control on the primary display. We'd have to extend later if we
         * ever get support for setting backlights on random desktop LCD
         * panels though */
        output = get_default_output(compositor);
        if (!output)
                return;

        if (!output->set_backlight)
                return;

        if (key == KEY_F9 || key == KEY_BRIGHTNESSDOWN)
                backlight_new = output->backlight_current - 25;
        else if (key == KEY_F10 || key == KEY_BRIGHTNESSUP)
                backlight_new = output->backlight_current + 25;

        if (backlight_new < 5)
                backlight_new = 5;
        if (backlight_new > 255)
                backlight_new = 255;

        output->backlight_current = backlight_new;
        output->set_backlight(output, output->backlight_current);
}

struct debug_binding_grab {
        struct weston_keyboard_grab grab;
        struct weston_seat *seat;
        uint32_t key[2];
        int key_released[2];
};

static void
debug_binding_key(struct weston_keyboard_grab *grab, uint32_t time,
                  uint32_t key, uint32_t state)
{
        struct debug_binding_grab *db = (struct debug_binding_grab *) grab;
        struct weston_compositor *ec = db->seat->compositor;
        struct wl_display *display = ec->wl_display;
        struct wl_resource *resource;
        uint32_t serial;
        int send = 0, terminate = 0;
        int check_binding = 1;
        int i;
        struct wl_list *resource_list;

        if (state == WL_KEYBOARD_KEY_STATE_RELEASED) {
                /* Do not run bindings on key releases */
                check_binding = 0;

                for (i = 0; i < 2; i++)
                        if (key == db->key[i])
                                db->key_released[i] = 1;

                if (db->key_released[0] && db->key_released[1]) {
                        /* All key releases been swalled so end the grab */
                        terminate = 1;
                } else if (key != db->key[0] && key != db->key[1]) {
                        /* Should not swallow release of other keys */
                        send = 1;
                }
        } else if (key == db->key[0] && !db->key_released[0]) {
                /* Do not check bindings for the first press of the binding
                 * key. This allows it to be used as a debug shortcut.
                 * We still need to swallow this event. */
                check_binding = 0;
        } else if (db->key[1]) {
                /* If we already ran a binding don't process another one since
                 * we can't keep track of all the binding keys that were
                 * pressed in order to swallow the release events. */
                send = 1;
                check_binding = 0;
        }

        if (check_binding) {
                if (weston_compositor_run_debug_binding(ec, db->seat, time,
                                                        key, state)) {
                        /* We ran a binding so swallow the press and keep the
                         * grab to swallow the released too. */
                        send = 0;
                        terminate = 0;
                        db->key[1] = key;
                } else {
                        /* Terminate the grab since the key pressed is not a
                         * debug binding key. */
                        send = 1;
                        terminate = 1;
                }
        }

        if (send) {
                serial = wl_display_next_serial(display);
                resource_list = &grab->keyboard->focus_resource_list;
                wl_resource_for_each(resource, resource_list) {
                        wl_keyboard_send_key(resource, serial, time, key, state);
                }
        }

        if (terminate) {
                weston_keyboard_end_grab(grab->keyboard);
                if (grab->keyboard->input_method_resource)
                        grab->keyboard->grab = &grab->keyboard->input_method_grab;
                free(db);
        }
}

static void
debug_binding_modifiers(struct weston_keyboard_grab *grab, uint32_t serial,
                        uint32_t mods_depressed, uint32_t mods_latched,
                        uint32_t mods_locked, uint32_t group)
{
        struct wl_resource *resource;
        struct wl_list *resource_list;

        resource_list = &grab->keyboard->focus_resource_list;

        wl_resource_for_each(resource, resource_list) {
                wl_keyboard_send_modifiers(resource, serial, mods_depressed,
                                           mods_latched, mods_locked, group);
        }
}

static void
debug_binding_cancel(struct weston_keyboard_grab *grab)
{
        struct debug_binding_grab *db = (struct debug_binding_grab *) grab;

        weston_keyboard_end_grab(grab->keyboard);
        free(db);
}

struct weston_keyboard_grab_interface debug_binding_keyboard_grab = {
        debug_binding_key,
        debug_binding_modifiers,
        debug_binding_cancel,
};

static void
debug_binding(struct weston_seat *seat, uint32_t time, uint32_t key, void *data)
{
        struct debug_binding_grab *grab;

        grab = calloc(1, sizeof *grab);
        if (!grab)
                return;

        grab->seat = (struct weston_seat *) seat;
        grab->key[0] = key;
        grab->grab.interface = &debug_binding_keyboard_grab;
        weston_keyboard_start_grab(seat->keyboard, &grab->grab);
}

static void
force_kill_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
                   void *data)
{
        struct weston_surface *focus_surface;
        struct wl_client *client;
        struct desktop_shell *shell = data;
        struct weston_compositor *compositor = shell->compositor;
        pid_t pid;

        focus_surface = seat->keyboard->focus;
        if (!focus_surface)
                return;

        wl_signal_emit(&compositor->kill_signal, focus_surface);

        client = wl_resource_get_client(focus_surface->resource);
        wl_client_get_credentials(client, &pid, NULL, NULL);

        /* Skip clients that we launched ourselves (the credentials of
         * the socketpair is ours) */
        if (pid == getpid())
                return;

        kill(pid, SIGKILL);
}

static void
workspace_up_binding(struct weston_seat *seat, uint32_t time,
                     uint32_t key, void *data)
{
        struct desktop_shell *shell = data;
        unsigned int new_index = shell->workspaces.current;

        if (shell->locked)
                return;
        if (new_index != 0)
                new_index--;

        change_workspace(shell, new_index);
}

static void
workspace_down_binding(struct weston_seat *seat, uint32_t time,
                       uint32_t key, void *data)
{
        struct desktop_shell *shell = data;
        unsigned int new_index = shell->workspaces.current;

        if (shell->locked)
                return;
        if (new_index < shell->workspaces.num - 1)
                new_index++;

        change_workspace(shell, new_index);
}

static void
workspace_f_binding(struct weston_seat *seat, uint32_t time,
                    uint32_t key, void *data)
{
        struct desktop_shell *shell = data;
        unsigned int new_index;

        if (shell->locked)
                return;
        new_index = key - KEY_F1;
        if (new_index >= shell->workspaces.num)
                new_index = shell->workspaces.num - 1;

        change_workspace(shell, new_index);
}

static void
workspace_move_surface_up_binding(struct weston_seat *seat, uint32_t time,
                                  uint32_t key, void *data)
{
        struct desktop_shell *shell = data;
        unsigned int new_index = shell->workspaces.current;

        if (shell->locked)
                return;

        if (new_index != 0)
                new_index--;

        take_surface_to_workspace_by_seat(shell, seat, new_index);
}

static void
workspace_move_surface_down_binding(struct weston_seat *seat, uint32_t time,
                                    uint32_t key, void *data)
{
        struct desktop_shell *shell = data;
        unsigned int new_index = shell->workspaces.current;

        if (shell->locked)
                return;

        if (new_index < shell->workspaces.num - 1)
                new_index++;

        take_surface_to_workspace_by_seat(shell, seat, new_index);
}

static void
shell_reposition_view_on_output_destroy(struct weston_view *view)
{
        struct weston_output *output, *first_output;
        struct weston_compositor *ec = view->surface->compositor;
        struct shell_surface *shsurf;
        float x, y;
        int visible;

        x = view->geometry.x;
        y = view->geometry.y;

        /* At this point the destroyed output is not in the list anymore.
         * If the view is still visible somewhere, we leave where it is,
         * otherwise, move it to the first output. */
        visible = 0;
        wl_list_for_each(output, &ec->output_list, link) {
                if (pixman_region32_contains_point(&output->region,
                                                   x, y, NULL)) {
                        visible = 1;
                        break;
                }
        }

        if (!visible) {
                first_output = container_of(ec->output_list.next,
                                            struct weston_output, link);

                x = first_output->x + first_output->width / 4;
                y = first_output->y + first_output->height / 4;

                weston_view_set_position(view, x, y);
        } else {
                weston_view_geometry_dirty(view);
        }


        shsurf = get_shell_surface(view->surface);

        if (shsurf) {
                shsurf->saved_position_valid = false;
                shsurf->next_state.maximized = false;
                shsurf->next_state.fullscreen = false;
                shsurf->state_changed = true;
        }
}

void
shell_for_each_layer(struct desktop_shell *shell,
                     shell_for_each_layer_func_t func, void *data)
{
        struct workspace **ws;

        func(shell, &shell->fullscreen_layer, data);
        func(shell, &shell->panel_layer, data);
        func(shell, &shell->background_layer, data);
        func(shell, &shell->lock_layer, data);
        func(shell, &shell->input_panel_layer, data);

        wl_array_for_each(ws, &shell->workspaces.array)
                func(shell, &(*ws)->layer, data);
}

static void
shell_output_destroy_move_layer(struct desktop_shell *shell,
                                struct weston_layer *layer,
                                void *data)
{
        struct weston_output *output = data;
        struct weston_view *view;

        wl_list_for_each(view, &layer->view_list.link, layer_link.link) {
                if (view->output != output)
                        continue;

                shell_reposition_view_on_output_destroy(view);
        }
}

static void
handle_output_destroy(struct wl_listener *listener, void *data)
{
        struct shell_output *output_listener =
                container_of(listener, struct shell_output, destroy_listener);
        struct weston_output *output = output_listener->output;
        struct desktop_shell *shell = output_listener->shell;

        shell_for_each_layer(shell, shell_output_destroy_move_layer, output);

        wl_list_remove(&output_listener->destroy_listener.link);
        wl_list_remove(&output_listener->link);
        free(output_listener);
}

static void
create_shell_output(struct desktop_shell *shell,
                                        struct weston_output *output)
{
        struct shell_output *shell_output;

        shell_output = zalloc(sizeof *shell_output);
        if (shell_output == NULL)
                return;

        shell_output->output = output;
        shell_output->shell = shell;
        shell_output->destroy_listener.notify = handle_output_destroy;
        wl_signal_add(&output->destroy_signal,
                      &shell_output->destroy_listener);
        wl_list_insert(shell->output_list.prev, &shell_output->link);
}

static void
handle_output_create(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell =
                container_of(listener, struct desktop_shell, output_create_listener);
        struct weston_output *output = (struct weston_output *)data;

        create_shell_output(shell, output);
}

static void
handle_output_move_layer(struct desktop_shell *shell,
                         struct weston_layer *layer, void *data)
{
        struct weston_output *output = data;
        struct weston_view *view;
        float x, y;

        wl_list_for_each(view, &layer->view_list.link, layer_link.link) {
                if (view->output != output)
                        continue;

                x = view->geometry.x + output->move_x;
                y = view->geometry.y + output->move_y;
                weston_view_set_position(view, x, y);
        }
}

static void
handle_output_move(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell;

        shell = container_of(listener, struct desktop_shell,
                             output_move_listener);

        shell_for_each_layer(shell, handle_output_move_layer, data);
}

static void
setup_output_destroy_handler(struct weston_compositor *ec,
                                                        struct desktop_shell *shell)
{
        struct weston_output *output;

        wl_list_init(&shell->output_list);
        wl_list_for_each(output, &ec->output_list, link)
                create_shell_output(shell, output);

        shell->output_create_listener.notify = handle_output_create;
        wl_signal_add(&ec->output_created_signal,
                                &shell->output_create_listener);

        shell->output_move_listener.notify = handle_output_move;
        wl_signal_add(&ec->output_moved_signal, &shell->output_move_listener);
}

static void
shell_destroy(struct wl_listener *listener, void *data)
{
        struct desktop_shell *shell =
                container_of(listener, struct desktop_shell, destroy_listener);
        struct workspace **ws;
        struct shell_output *shell_output, *tmp;

        /* Force state to unlocked so we don't try to fade */
        shell->locked = false;

        if (shell->child.client) {
                /* disable respawn */
                wl_list_remove(&shell->child.client_destroy_listener.link);
                wl_client_destroy(shell->child.client);
        }

        wl_list_remove(&shell->idle_listener.link);
        wl_list_remove(&shell->wake_listener.link);

        input_panel_destroy(shell);

        wl_list_for_each_safe(shell_output, tmp, &shell->output_list, link) {
                wl_list_remove(&shell_output->destroy_listener.link);
                wl_list_remove(&shell_output->link);
                free(shell_output);
        }

        wl_list_remove(&shell->output_create_listener.link);
        wl_list_remove(&shell->output_move_listener.link);

        wl_array_for_each(ws, &shell->workspaces.array)
                workspace_destroy(*ws);
        wl_array_release(&shell->workspaces.array);

        free(shell->screensaver.path);
        free(shell->client);
        free(shell);
}

static void
shell_add_bindings(struct weston_compositor *ec, struct desktop_shell *shell)
{
        uint32_t mod;
        int i, num_workspace_bindings;

        /* fixed bindings */
        weston_compositor_add_key_binding(ec, KEY_BACKSPACE,
                                          MODIFIER_CTRL | MODIFIER_ALT,
                                          terminate_binding, ec);
        weston_compositor_add_button_binding(ec, BTN_LEFT, 0,
                                             click_to_activate_binding,
                                             shell);
        weston_compositor_add_button_binding(ec, BTN_RIGHT, 0,
                                             click_to_activate_binding,
                                             shell);
        weston_compositor_add_touch_binding(ec, 0,
                                            touch_to_activate_binding,
                                            shell);
        weston_compositor_add_axis_binding(ec, WL_POINTER_AXIS_VERTICAL_SCROLL,
                                           MODIFIER_SUPER | MODIFIER_ALT,
                                           surface_opacity_binding, NULL);
        weston_compositor_add_axis_binding(ec, WL_POINTER_AXIS_VERTICAL_SCROLL,
                                           MODIFIER_SUPER, zoom_axis_binding,
                                           NULL);

        /* configurable bindings */
        mod = shell->binding_modifier;
        weston_compositor_add_key_binding(ec, KEY_PAGEUP, mod,
                                          zoom_key_binding, NULL);
        weston_compositor_add_key_binding(ec, KEY_PAGEDOWN, mod,
                                          zoom_key_binding, NULL);
        weston_compositor_add_key_binding(ec, KEY_M, mod | MODIFIER_SHIFT,
                                          maximize_binding, NULL);
        weston_compositor_add_key_binding(ec, KEY_F, mod | MODIFIER_SHIFT,
                                          fullscreen_binding, NULL);
        weston_compositor_add_button_binding(ec, BTN_LEFT, mod, move_binding,
                                             shell);
        weston_compositor_add_touch_binding(ec, mod, touch_move_binding, shell);
        weston_compositor_add_button_binding(ec, BTN_MIDDLE, mod,
                                             resize_binding, shell);
        weston_compositor_add_button_binding(ec, BTN_LEFT,
                                             mod | MODIFIER_SHIFT,
                                             resize_binding, shell);

        if (ec->capabilities & WESTON_CAP_ROTATION_ANY)
                weston_compositor_add_button_binding(ec, BTN_RIGHT, mod,
                                                     rotate_binding, NULL);

        weston_compositor_add_key_binding(ec, KEY_TAB, mod, switcher_binding,
                                          shell);
        weston_compositor_add_key_binding(ec, KEY_F9, mod, backlight_binding,
                                          ec);
        weston_compositor_add_key_binding(ec, KEY_BRIGHTNESSDOWN, 0,
                                          backlight_binding, ec);
        weston_compositor_add_key_binding(ec, KEY_F10, mod, backlight_binding,
                                          ec);
        weston_compositor_add_key_binding(ec, KEY_BRIGHTNESSUP, 0,
                                          backlight_binding, ec);
        weston_compositor_add_key_binding(ec, KEY_K, mod,
                                          force_kill_binding, shell);
        weston_compositor_add_key_binding(ec, KEY_UP, mod,
                                          workspace_up_binding, shell);
        weston_compositor_add_key_binding(ec, KEY_DOWN, mod,
                                          workspace_down_binding, shell);
        weston_compositor_add_key_binding(ec, KEY_UP, mod | MODIFIER_SHIFT,
                                          workspace_move_surface_up_binding,
                                          shell);
        weston_compositor_add_key_binding(ec, KEY_DOWN, mod | MODIFIER_SHIFT,
                                          workspace_move_surface_down_binding,
                                          shell);

        if (shell->exposay_modifier)
                weston_compositor_add_modifier_binding(ec, shell->exposay_modifier,
                                                       exposay_binding, shell);

        /* Add bindings for mod+F[1-6] for workspace 1 to 6. */
        if (shell->workspaces.num > 1) {
                num_workspace_bindings = shell->workspaces.num;
                if (num_workspace_bindings > 6)
                        num_workspace_bindings = 6;
                for (i = 0; i < num_workspace_bindings; i++)
                        weston_compositor_add_key_binding(ec, KEY_F1 + i, mod,
                                                          workspace_f_binding,
                                                          shell);
        }

        /* Debug bindings */
        weston_compositor_add_key_binding(ec, KEY_SPACE, mod | MODIFIER_SHIFT,
                                          debug_binding, shell);
}

static void
handle_seat_created(struct wl_listener *listener, void *data)
{
        struct weston_seat *seat = data;

        create_shell_seat(seat);
}

WL_EXPORT int
module_init(struct weston_compositor *ec,
            int *argc, char *argv[])
{
        struct weston_seat *seat;
        struct desktop_shell *shell;
        struct workspace **pws;
        unsigned int i;
        struct wl_event_loop *loop;

        shell = zalloc(sizeof *shell);
        if (shell == NULL)
                return -1;

        shell->compositor = ec;

        shell->destroy_listener.notify = shell_destroy;
        wl_signal_add(&ec->destroy_signal, &shell->destroy_listener);
        shell->idle_listener.notify = idle_handler;
        wl_signal_add(&ec->idle_signal, &shell->idle_listener);
        shell->wake_listener.notify = wake_handler;
        wl_signal_add(&ec->wake_signal, &shell->wake_listener);

        ec->shell_interface.shell = shell;
        ec->shell_interface.create_shell_surface = create_shell_surface;
        ec->shell_interface.get_primary_view = get_primary_view;
        ec->shell_interface.set_toplevel = set_toplevel;
        ec->shell_interface.set_transient = set_transient;
        ec->shell_interface.set_fullscreen = shell_interface_set_fullscreen;
        ec->shell_interface.set_xwayland = set_xwayland;
        ec->shell_interface.move = shell_interface_move;
        ec->shell_interface.resize = surface_resize;
        ec->shell_interface.set_title = set_title;
        ec->shell_interface.set_window_geometry = set_window_geometry;

        weston_layer_init(&shell->fullscreen_layer, &ec->cursor_layer.link);
        weston_layer_init(&shell->panel_layer, &shell->fullscreen_layer.link);
        weston_layer_init(&shell->background_layer, &shell->panel_layer.link);
        weston_layer_init(&shell->lock_layer, NULL);
        weston_layer_init(&shell->input_panel_layer, NULL);

        wl_array_init(&shell->workspaces.array);
        wl_list_init(&shell->workspaces.client_list);

        if (input_panel_setup(shell) < 0)
                return -1;

        shell_configuration(shell);

        shell->exposay.state_cur = EXPOSAY_LAYOUT_INACTIVE;
        shell->exposay.state_target = EXPOSAY_TARGET_CANCEL;

        for (i = 0; i < shell->workspaces.num; i++) {
                pws = wl_array_add(&shell->workspaces.array, sizeof *pws);
                if (pws == NULL)
                        return -1;

                *pws = workspace_create();
                if (*pws == NULL)
                        return -1;
        }
        activate_workspace(shell, 0);

        weston_layer_init(&shell->minimized_layer, NULL);

        wl_list_init(&shell->workspaces.anim_sticky_list);
        wl_list_init(&shell->workspaces.animation.link);
        shell->workspaces.animation.frame = animate_workspace_change_frame;

        if (wl_global_create(ec->wl_display, &wl_shell_interface, 1,
                                  shell, bind_shell) == NULL)
                return -1;

        if (wl_global_create(ec->wl_display, &xdg_shell_interface, 1,
                                  shell, bind_xdg_shell) == NULL)
                return -1;

        if (wl_global_create(ec->wl_display,
                             &desktop_shell_interface, 3,
                             shell, bind_desktop_shell) == NULL)
                return -1;

        if (wl_global_create(ec->wl_display, &screensaver_interface, 1,
                             shell, bind_screensaver) == NULL)
                return -1;

        if (wl_global_create(ec->wl_display, &workspace_manager_interface, 1,
                             shell, bind_workspace_manager) == NULL)
                return -1;

        shell->child.deathstamp = weston_compositor_get_time();

        shell->panel_position = DESKTOP_SHELL_PANEL_POSITION_TOP;

        setup_output_destroy_handler(ec, shell);

        loop = wl_display_get_event_loop(ec->wl_display);
        wl_event_loop_add_idle(loop, launch_desktop_shell_process, shell);

        shell->screensaver.timer =
                wl_event_loop_add_timer(loop, screensaver_timeout, shell);

        wl_list_for_each(seat, &ec->seat_list, link)
                handle_seat_created(NULL, seat);
        shell->seat_create_listener.notify = handle_seat_created;
        wl_signal_add(&ec->seat_created_signal, &shell->seat_create_listener);

        screenshooter_create(ec);

        shell_add_bindings(ec, shell);

        shell_fade_init(shell);

        clock_gettime(CLOCK_MONOTONIC, &shell->startup_time);

        return 0;
}