src/remoting/host/disconnect_window_linux.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <gtk/gtk.h>
   6 #include <math.h>
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/logging.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "remoting/base/string_resources.h"
  13 #include "remoting/host/client_session_control.h"
  14 #include "remoting/host/host_window.h"
  15 #include "ui/base/glib/glib_signal.h"
  16 #include "ui/base/l10n/l10n_util.h"
  17
  18 namespace remoting {
  19
  20 namespace {
  21
  22 class DisconnectWindowGtk : public HostWindow {
  23  public:
  24   DisconnectWindowGtk();
  25   virtual ~DisconnectWindowGtk();
  26
  27   // HostWindow overrides.
  28   virtual void Start(
  29       const base::WeakPtr<ClientSessionControl>& client_session_control)
  30       OVERRIDE;
  31
  32  private:
  33   CHROMEG_CALLBACK_1(DisconnectWindowGtk, gboolean, OnDelete,
  34                      GtkWidget*, GdkEvent*);
  35   CHROMEG_CALLBACK_0(DisconnectWindowGtk, void, OnClicked, GtkButton*);
  36   CHROMEG_CALLBACK_1(DisconnectWindowGtk, gboolean, OnConfigure,
  37                      GtkWidget*, GdkEventConfigure*);
  38   CHROMEG_CALLBACK_1(DisconnectWindowGtk, gboolean, OnButtonPress,
  39                      GtkWidget*, GdkEventButton*);
  40
  41   // Used to disconnect the client session.
  42   base::WeakPtr<ClientSessionControl> client_session_control_;
  43
  44   GtkWidget* disconnect_window_;
  45   GtkWidget* message_;
  46   GtkWidget* button_;
  47
  48   // Used to distinguish resize events from other types of "configure-event"
  49   // notifications.
  50   int current_width_;
  51   int current_height_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(DisconnectWindowGtk);
  54 };
  55
  56 // Helper function for creating a rectangular path with rounded corners, as
  57 // Cairo doesn't have this facility.  |radius| is the arc-radius of each
  58 // corner.  The bounding rectangle extends from (0, 0) to (width, height).
  59 void AddRoundRectPath(cairo_t* cairo_context, int width, int height,
  60                       int radius) {
  61   cairo_new_sub_path(cairo_context);
  62   cairo_arc(cairo_context, width - radius, radius, radius, -M_PI_2, 0);
  63   cairo_arc(cairo_context, width - radius, height - radius, radius, 0, M_PI_2);
  64   cairo_arc(cairo_context, radius, height - radius, radius, M_PI_2, 2 * M_PI_2);
  65   cairo_arc(cairo_context, radius, radius, radius, 2 * M_PI_2, 3 * M_PI_2);
  66   cairo_close_path(cairo_context);
  67 }
  68
  69 DisconnectWindowGtk::DisconnectWindowGtk()
  70     : disconnect_window_(NULL),
  71       current_width_(0),
  72       current_height_(0) {
  73 }
  74
  75 DisconnectWindowGtk::~DisconnectWindowGtk() {
  76   DCHECK(CalledOnValidThread());
  77
  78   if (disconnect_window_) {
  79     gtk_widget_destroy(disconnect_window_);
  80     disconnect_window_ = NULL;
  81   }
  82 }
  83
  84 void DisconnectWindowGtk::Start(
  85     const base::WeakPtr<ClientSessionControl>& client_session_control) {
  86   DCHECK(CalledOnValidThread());
  87   DCHECK(!client_session_control_.get());
  88   DCHECK(client_session_control.get());
  89   DCHECK(!disconnect_window_);
  90
  91   client_session_control_ = client_session_control;
  92
  93   // Create the window.
  94   disconnect_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  95   GtkWindow* window = GTK_WINDOW(disconnect_window_);
  96
  97   g_signal_connect(disconnect_window_, "delete-event",
  98                    G_CALLBACK(OnDeleteThunk), this);
  99   gtk_window_set_title(window,
 100                        l10n_util::GetStringUTF8(IDS_PRODUCT_NAME).c_str());
 101   gtk_window_set_resizable(window, FALSE);
 102
 103   // Try to keep the window always visible.
 104   gtk_window_stick(window);
 105   gtk_window_set_keep_above(window, TRUE);
 106
 107   // Remove window titlebar.
 108   gtk_window_set_decorated(window, FALSE);
 109
 110   // In case the titlebar is still there, try to remove some of the buttons.
 111   // Utility windows have no minimize button or taskbar presence.
 112   gtk_window_set_type_hint(window, GDK_WINDOW_TYPE_HINT_UTILITY);
 113   gtk_window_set_deletable(window, FALSE);
 114
 115   // Allow custom rendering of the background pixmap.
 116   gtk_widget_set_app_paintable(disconnect_window_, TRUE);
 117
 118   // Handle window resizing, to regenerate the background pixmap and window
 119   // shape bitmap.  The stored width & height need to be initialized here
 120   // in case the window is created a second time (the size of the previous
 121   // window would be remembered, preventing the generation of bitmaps for the
 122   // new window).
 123   current_height_ = current_width_ = 0;
 124   g_signal_connect(disconnect_window_, "configure-event",
 125                    G_CALLBACK(OnConfigureThunk), this);
 126
 127   // Handle mouse events to allow the user to drag the window around.
 128   gtk_widget_set_events(disconnect_window_, GDK_BUTTON_PRESS_MASK);
 129   g_signal_connect(disconnect_window_, "button-press-event",
 130                    G_CALLBACK(OnButtonPressThunk), this);
 131
 132   // All magic numbers taken from screen shots provided by UX.
 133   // The alignment sets narrow margins at the top and bottom, compared with
 134   // left and right.  The left margin is made larger to accommodate the
 135   // window movement gripper.
 136   GtkWidget* align = gtk_alignment_new(0, 0, 1, 1);
 137   gtk_alignment_set_padding(GTK_ALIGNMENT(align), 8, 8, 24, 12);
 138   gtk_container_add(GTK_CONTAINER(window), align);
 139
 140   GtkWidget* button_row = gtk_hbox_new(FALSE, 12);
 141   gtk_container_add(GTK_CONTAINER(align), button_row);
 142
 143   button_ = gtk_button_new_with_label(
 144       l10n_util::GetStringUTF8(IDS_STOP_SHARING_BUTTON).c_str());
 145   gtk_box_pack_end(GTK_BOX(button_row), button_, FALSE, FALSE, 0);
 146
 147   g_signal_connect(button_, "clicked", G_CALLBACK(OnClickedThunk), this);
 148
 149   message_ = gtk_label_new(NULL);
 150   gtk_box_pack_end(GTK_BOX(button_row), message_, FALSE, FALSE, 0);
 151
 152   // Override any theme setting for the text color, so that the text is
 153   // readable against the window's background pixmap.
 154   PangoAttrList* attributes = pango_attr_list_new();
 155   PangoAttribute* text_color = pango_attr_foreground_new(0, 0, 0);
 156   pango_attr_list_insert(attributes, text_color);
 157   gtk_label_set_attributes(GTK_LABEL(message_), attributes);
 158   pango_attr_list_unref(attributes);
 159
 160   gtk_widget_show_all(disconnect_window_);
 161
 162   // Extract the user name from the JID.
 163   std::string client_jid = client_session_control_->client_jid();
 164   base::string16 username =
 165       base::UTF8ToUTF16(client_jid.substr(0, client_jid.find('/')));
 166   gtk_label_set_text(
 167       GTK_LABEL(message_),
 168       l10n_util::GetStringFUTF8(IDS_MESSAGE_SHARED, username).c_str());
 169   gtk_window_present(window);
 170 }
 171
 172 void DisconnectWindowGtk::OnClicked(GtkButton* button) {
 173   DCHECK(CalledOnValidThread());
 174
 175   if (client_session_control_.get())
 176     client_session_control_->DisconnectSession();
 177 }
 178
 179 gboolean DisconnectWindowGtk::OnDelete(GtkWidget* window,
 180                                        GdkEvent* event) {
 181   DCHECK(CalledOnValidThread());
 182
 183   if (client_session_control_.get())
 184     client_session_control_->DisconnectSession();
 185   return TRUE;
 186 }
 187
 188 gboolean DisconnectWindowGtk::OnConfigure(GtkWidget* widget,
 189                                           GdkEventConfigure* event) {
 190   DCHECK(CalledOnValidThread());
 191
 192   // Only generate bitmaps if the size has actually changed.
 193   if (event->width == current_width_ && event->height == current_height_)
 194     return FALSE;
 195
 196   current_width_ = event->width;
 197   current_height_ = event->height;
 198
 199   // Create the depth 1 pixmap for the window shape.
 200   GdkPixmap* shape_mask = gdk_pixmap_new(NULL, current_width_, current_height_,
 201                                          1);
 202   cairo_t* cairo_context = gdk_cairo_create(shape_mask);
 203
 204   // Set the arc radius for the corners.
 205   const int kCornerRadius = 6;
 206
 207   // Initialize the whole bitmap to be transparent.
 208   cairo_set_source_rgba(cairo_context, 0, 0, 0, 0);
 209   cairo_set_operator(cairo_context, CAIRO_OPERATOR_SOURCE);
 210   cairo_paint(cairo_context);
 211
 212   // Paint an opaque round rect covering the whole area (leaving the extreme
 213   // corners transparent).
 214   cairo_set_source_rgba(cairo_context, 1, 1, 1, 1);
 215   cairo_set_operator(cairo_context, CAIRO_OPERATOR_SOURCE);
 216   AddRoundRectPath(cairo_context, current_width_, current_height_,
 217                    kCornerRadius);
 218   cairo_fill(cairo_context);
 219
 220   cairo_destroy(cairo_context);
 221   gdk_window_shape_combine_mask(widget->window, shape_mask, 0, 0);
 222   g_object_unref(shape_mask);
 223
 224   // Create a full-color pixmap for the window background image.
 225   GdkPixmap* background = gdk_pixmap_new(NULL, current_width_, current_height_,
 226                                          24);
 227   cairo_context = gdk_cairo_create(background);
 228
 229   // Paint the whole bitmap one color.
 230   cairo_set_source_rgb(cairo_context, 0.91, 0.91, 0.91);
 231   cairo_paint(cairo_context);
 232
 233   // Paint the round-rectangle edge.
 234   cairo_set_source_rgb(cairo_context, 0.13, 0.69, 0.11);
 235   cairo_set_line_width(cairo_context, 6);
 236   AddRoundRectPath(cairo_context, current_width_, current_height_,
 237                    kCornerRadius);
 238   cairo_stroke(cairo_context);
 239
 240   // Render the window-gripper.  In order for a straight line to light up
 241   // single pixels, Cairo requires the coordinates to have fractional
 242   // components of 0.5 (so the "/ 2" is a deliberate integer division).
 243   double gripper_top = current_height_ / 2 - 10.5;
 244   double gripper_bottom = current_height_ / 2 + 10.5;
 245   cairo_set_line_width(cairo_context, 1);
 246
 247   double x = 12.5;
 248   cairo_set_source_rgb(cairo_context, 0.70, 0.70, 0.70);
 249   cairo_move_to(cairo_context, x, gripper_top);
 250   cairo_line_to(cairo_context, x, gripper_bottom);
 251   cairo_stroke(cairo_context);
 252   x += 3;
 253   cairo_move_to(cairo_context, x, gripper_top);
 254   cairo_line_to(cairo_context, x, gripper_bottom);
 255   cairo_stroke(cairo_context);
 256
 257   x -= 2;
 258   cairo_set_source_rgb(cairo_context, 0.97, 0.97, 0.97);
 259   cairo_move_to(cairo_context, x, gripper_top);
 260   cairo_line_to(cairo_context, x, gripper_bottom);
 261   cairo_stroke(cairo_context);
 262   x += 3;
 263   cairo_move_to(cairo_context, x, gripper_top);
 264   cairo_line_to(cairo_context, x, gripper_bottom);
 265   cairo_stroke(cairo_context);
 266
 267   cairo_destroy(cairo_context);
 268
 269   gdk_window_set_back_pixmap(widget->window, background, FALSE);
 270   g_object_unref(background);
 271   gdk_window_invalidate_rect(widget->window, NULL, TRUE);
 272
 273   return FALSE;
 274 }
 275
 276 gboolean DisconnectWindowGtk::OnButtonPress(GtkWidget* widget,
 277                                             GdkEventButton* event) {
 278   DCHECK(CalledOnValidThread());
 279
 280   gtk_window_begin_move_drag(GTK_WINDOW(disconnect_window_),
 281                              event->button,
 282                              event->x_root,
 283                              event->y_root,
 284                              event->time);
 285   return FALSE;
 286 }
 287
 288 }  // namespace
 289
 290 // static
 291 scoped_ptr<HostWindow> HostWindow::CreateDisconnectWindow() {
 292   return scoped_ptr<HostWindow>(new DisconnectWindowGtk());
 293 }
 294
 295 }  // namespace remoting