clients/editor.c

   1 /*
   2  * Copyright © 2012 Openismus GmbH
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of the copyright holders not be used in
   9  * advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  The copyright holders make
  11  * no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  17  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  18  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  19  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #include <assert.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <linux/input.h>
  29 #include <cairo.h>
  30
  31 #include "window.h"
  32 #include "text-client-protocol.h"
  33
  34 struct text_entry {
  35         struct widget *widget;
  36         char *text;
  37         int active;
  38         struct rectangle allocation;
  39         struct text_model *model;
  40 };
  41
  42 struct editor {
  43         struct text_model_manager *text_model_manager;
  44         struct display *display;
  45         struct window *window;
  46         struct widget *widget;
  47         struct text_entry *entry;
  48         struct text_entry *editor;
  49 };
  50
  51 static void
  52 text_entry_append(struct text_entry *entry, const char *text)
  53 {
  54         entry->text = realloc(entry->text, strlen(entry->text) + strlen(text) + 1);
  55         strcat(entry->text, text);
  56 }
  57
  58
  59 static void
  60 text_model_commit_string(void *data,
  61                          struct text_model *text_model,
  62                          const char *text,
  63                          uint32_t index)
  64 {
  65         struct text_entry *entry = data;
  66
  67         text_entry_append(entry, text);
  68
  69         widget_schedule_redraw(entry->widget);
  70 }
  71
  72 static const struct text_model_listener text_model_listener = {
  73         text_model_commit_string
  74 };
  75
  76 static struct text_entry*
  77 text_entry_create(struct editor *editor, const char *text)
  78 {
  79         struct text_entry *entry;
  80         struct wl_surface *surface;
  81
  82         entry = malloc(sizeof *entry);
  83
  84         surface = window_get_wl_surface(editor->window);
  85
  86         entry->widget = editor->widget;
  87         entry->text = strdup(text);
  88         entry->active = 0;
  89         entry->model = text_model_manager_create_text_model(editor->text_model_manager, surface);
  90         text_model_add_listener(entry->model, &text_model_listener, entry);
  91
  92         return entry;
  93 }
  94
  95 static void
  96 text_entry_destroy(struct text_entry *entry)
  97 {
  98         text_model_destroy(entry->model);
  99         free(entry->text);
 100         free(entry);
 101 }
 102
 103 static void
 104 text_entry_draw(struct text_entry *entry, cairo_t *cr)
 105 {
 106         cairo_save(cr);
 107         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 108
 109         cairo_rectangle(cr, entry->allocation.x, entry->allocation.y, entry->allocation.width, entry->allocation.height);
 110         cairo_clip(cr);
 111
 112         cairo_translate(cr, entry->allocation.x, entry->allocation.y);
 113         cairo_rectangle(cr, 0, 0, entry->allocation.width, entry->allocation.height);
 114         cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
 115         cairo_fill(cr);
 116         if (entry->active) {
 117                 cairo_rectangle(cr, 0, 0, entry->allocation.width, entry->allocation.height);
 118                 cairo_set_source_rgba(cr, 0, 0, 1, 0.5);
 119                 cairo_stroke(cr);
 120         }
 121
 122         cairo_set_source_rgb(cr, 0, 0, 0);
 123         cairo_select_font_face(cr, "sans",
 124                                CAIRO_FONT_SLANT_NORMAL,
 125                                CAIRO_FONT_WEIGHT_BOLD);
 126         cairo_set_font_size(cr, 14);
 127
 128         cairo_translate(cr, 10, entry->allocation.height / 2);
 129         cairo_show_text(cr, entry->text);
 130
 131         cairo_restore(cr);
 132 }
 133
 134 static void
 135 redraw_handler(struct widget *widget, void *data)
 136 {
 137         struct editor *editor = data;
 138         cairo_surface_t *surface;
 139         struct rectangle allocation;
 140         cairo_t *cr;
 141
 142         surface = window_get_surface(editor->window);
 143         widget_get_allocation(editor->widget, &allocation);
 144
 145         cr = cairo_create(surface);
 146         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 147         cairo_clip(cr);
 148
 149         cairo_translate(cr, allocation.x, allocation.y);
 150
 151         /* Draw background */
 152         cairo_push_group(cr);
 153         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 154         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 155         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 156         cairo_fill(cr);
 157
 158         /* Entry */
 159         text_entry_draw(editor->entry, cr);
 160
 161         /* Editor */
 162         text_entry_draw(editor->editor, cr);
 163
 164         cairo_pop_group_to_source(cr);
 165         cairo_paint(cr);
 166
 167         cairo_destroy(cr);
 168         cairo_surface_destroy(surface);
 169 }
 170
 171 static void
 172 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 173                     int32_t width, int32_t height)
 174 {
 175         entry->allocation.x = x;
 176         entry->allocation.y = y;
 177         entry->allocation.width = width;
 178         entry->allocation.height = height;
 179 }
 180
 181 static void
 182 resize_handler(struct widget *widget,
 183                int32_t width, int32_t height, void *data)
 184 {
 185         struct editor *editor = data;
 186
 187         text_entry_allocate(editor->entry, 20, 20, width - 40, height / 2 - 40);
 188         text_entry_allocate(editor->editor, 20, height / 2 + 20, width - 40, height / 2 - 40);
 189 }
 190
 191 static int32_t
 192 rectangle_contains(struct rectangle *rectangle, int32_t x, int32_t y)
 193 {
 194         if (x < rectangle->x || x > rectangle->x + rectangle->width) {
 195                 return 0;
 196         }
 197
 198         if (y < rectangle->y || y > rectangle->y + rectangle->height) {
 199                 return 0;
 200         }
 201
 202         return 1;
 203 }
 204
 205 static void
 206 text_entry_activate(struct text_entry *entry)
 207 {
 208         text_model_activate(entry->model);
 209 }
 210
 211 static void
 212 text_entry_deactivate(struct text_entry *entry)
 213 {
 214         text_model_deactivate(entry->model);
 215 }
 216
 217 static void
 218 button_handler(struct widget *widget,
 219                struct input *input, uint32_t time,
 220                uint32_t button,
 221                enum wl_pointer_button_state state, void *data)
 222 {
 223         struct editor *editor = data;
 224         struct rectangle allocation;
 225         int32_t x, y;
 226
 227         if (state != WL_POINTER_BUTTON_STATE_PRESSED || button != BTN_LEFT) {
 228                 return;
 229         }
 230
 231         input_get_position(input, &x, &y);
 232
 233         widget_get_allocation(editor->widget, &allocation);
 234         x -= allocation.x;
 235         y -= allocation.y;
 236
 237         int32_t activate_entry = rectangle_contains(&editor->entry->allocation, x, y);
 238         int32_t activate_editor = rectangle_contains(&editor->editor->allocation, x, y);
 239         assert(!(activate_entry && activate_editor));
 240
 241         if (activate_entry) {
 242                 if (editor->editor->active)
 243                         text_entry_deactivate(editor->editor);
 244                 if (!editor->entry->active)
 245                         text_entry_activate(editor->entry);
 246         } else if (activate_editor) {
 247                 if (editor->entry->active)
 248                         text_entry_deactivate(editor->entry);
 249                 if (!editor->editor->active)
 250                         text_entry_activate(editor->editor);
 251         } else {
 252                 if (editor->entry->active)
 253                         text_entry_deactivate(editor->entry);
 254                 if (editor->editor->active)
 255                         text_entry_deactivate(editor->editor);
 256         }
 257         editor->entry->active = activate_entry;
 258         editor->editor->active = activate_editor;
 259         assert(!(editor->entry->active && editor->editor->active));
 260
 261         widget_schedule_redraw(widget);
 262 }
 263
 264 static void
 265 global_handler(struct wl_display *display, uint32_t id,
 266                const char *interface, uint32_t version, void *data)
 267 {
 268         struct editor *editor = data;
 269
 270         if (!strcmp(interface, "text_model_manager")) {
 271                 editor->text_model_manager = wl_display_bind(display, id,
 272                                                              &text_model_manager_interface);
 273         }
 274 }
 275
 276 int
 277 main(int argc, char *argv[])
 278 {
 279         struct editor editor;
 280
 281         editor.display = display_create(argc, argv);
 282         if (editor.display == NULL) {
 283                 fprintf(stderr, "failed to create display: %m\n");
 284                 return -1;
 285         }
 286         wl_display_add_global_listener(display_get_display(editor.display),
 287                                        global_handler, &editor);
 288
 289
 290         editor.window = window_create(editor.display);
 291         editor.widget = frame_create(editor.window, &editor);
 292
 293         editor.entry = text_entry_create(&editor, "Entry");
 294         editor.editor = text_entry_create(&editor, "Editor");
 295
 296         window_set_title(editor.window, "Text Editor");
 297
 298         widget_set_redraw_handler(editor.widget, redraw_handler);
 299         widget_set_resize_handler(editor.widget, resize_handler);
 300         widget_set_button_handler(editor.widget, button_handler);
 301
 302         window_schedule_resize(editor.window, 500, 400);
 303
 304         display_run(editor.display);
 305
 306         text_entry_destroy(editor.entry);
 307         text_entry_destroy(editor.editor);
 308
 309         return 0;
 310 }