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 <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include <linux/input.h>
  28 #include <cairo.h>
  29
  30 #include "window.h"
  31 #include "text-client-protocol.h"
  32
  33 struct text_entry {
  34         struct widget *widget;
  35         char *text;
  36         int active;
  37         struct rectangle allocation;
  38         struct text_model *model;
  39 };
  40
  41 struct editor {
  42         struct input_method *input_method;
  43         struct display *display;
  44         struct window *window;
  45         struct widget *widget;
  46         struct text_entry *entry;
  47         struct text_entry *editor;
  48 };
  49
  50 static void
  51 text_entry_append(struct text_entry *entry, const char *text)
  52 {
  53         entry->text = realloc(entry->text, strlen(entry->text) + strlen(text) + 1);
  54         strcat(entry->text, text);
  55 }
  56
  57
  58 static void
  59 text_model_commit_string(void *data,
  60                          struct text_model *text_model,
  61                          const char *text,
  62                          uint32_t index)
  63 {
  64         struct text_entry *entry = data;
  65
  66         text_entry_append(entry, text);
  67
  68         widget_schedule_redraw(entry->widget);
  69 }
  70
  71 static const struct text_model_listener text_model_listener = {
  72         text_model_commit_string
  73 };
  74
  75 static struct text_entry*
  76 text_entry_create(struct editor *editor, const char *text)
  77 {
  78         struct text_entry *entry;
  79         struct wl_surface *surface;
  80
  81         entry = malloc(sizeof *entry);
  82
  83         surface = window_get_wl_surface(editor->window);
  84
  85         entry->widget = editor->widget;
  86         entry->text = strdup(text);
  87         entry->active = 0;
  88         entry->model = input_method_create_text_model(editor->input_method, surface);
  89         text_model_add_listener(entry->model, &text_model_listener, entry);
  90
  91         return entry;
  92 }
  93
  94 static void
  95 text_entry_destroy(struct text_entry *entry)
  96 {
  97         text_model_destroy(entry->model);
  98         free(entry->text);
  99         free(entry);
 100 }
 101
 102 static void
 103 text_entry_draw(struct text_entry *entry, cairo_t *cr)
 104 {
 105         cairo_save(cr);
 106         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 107
 108         cairo_rectangle(cr, entry->allocation.x, entry->allocation.y, entry->allocation.width, entry->allocation.height);
 109         cairo_clip(cr);
 110
 111         cairo_translate(cr, entry->allocation.x, entry->allocation.y);
 112         cairo_rectangle(cr, 0, 0, entry->allocation.width, entry->allocation.height);
 113         cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
 114         cairo_fill(cr);
 115         if (entry->active) {
 116                 cairo_rectangle(cr, 0, 0, entry->allocation.width, entry->allocation.height);
 117                 cairo_set_source_rgba(cr, 0, 0, 1, 0.5);
 118                 cairo_stroke(cr);
 119         }
 120
 121         cairo_set_source_rgb(cr, 0, 0, 0);
 122         cairo_select_font_face(cr, "sans",
 123                                CAIRO_FONT_SLANT_NORMAL,
 124                                CAIRO_FONT_WEIGHT_BOLD);
 125         cairo_set_font_size(cr, 14);
 126
 127         cairo_translate(cr, 10, entry->allocation.height / 2);
 128         cairo_show_text(cr, entry->text);
 129
 130         cairo_restore(cr);
 131 }
 132
 133 static void
 134 redraw_handler(struct widget *widget, void *data)
 135 {
 136         struct editor *editor = data;
 137         cairo_surface_t *surface;
 138         struct rectangle allocation;
 139         cairo_t *cr;
 140
 141         surface = window_get_surface(editor->window);
 142         widget_get_allocation(editor->widget, &allocation);
 143
 144         cr = cairo_create(surface);
 145         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 146         cairo_clip(cr);
 147
 148         cairo_translate(cr, allocation.x, allocation.y);
 149
 150         /* Draw background */
 151         cairo_push_group(cr);
 152         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 153         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 154         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 155         cairo_fill(cr);
 156
 157         /* Entry */
 158         text_entry_draw(editor->entry, cr);
 159
 160         /* Editor */
 161         text_entry_draw(editor->editor, cr);
 162
 163         cairo_pop_group_to_source(cr);
 164         cairo_paint(cr);
 165
 166         cairo_destroy(cr);
 167         cairo_surface_destroy(surface);
 168 }
 169
 170 static void
 171 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 172                     int32_t width, int32_t height)
 173 {
 174         entry->allocation.x = x;
 175         entry->allocation.y = y;
 176         entry->allocation.width = width;
 177         entry->allocation.height = height;
 178 }
 179
 180 static void
 181 resize_handler(struct widget *widget,
 182                int32_t width, int32_t height, void *data)
 183 {
 184         struct editor *editor = data;
 185
 186         text_entry_allocate(editor->entry, 20, 20, width - 40, height / 2 - 40);
 187         text_entry_allocate(editor->editor, 20, height / 2 + 20, width - 40, height / 2 - 40);
 188 }
 189
 190 static int32_t
 191 rectangle_contains(struct rectangle *rectangle, int32_t x, int32_t y)
 192 {
 193         if (x < rectangle->x || x > rectangle->x + rectangle->width) {
 194                 return 0;
 195         }
 196
 197         if (y < rectangle->y || y > rectangle->y + rectangle->height) {
 198                 return 0;
 199         }
 200
 201         return 1;
 202 }
 203
 204 static void
 205 text_entry_activate(struct text_entry *entry)
 206 {
 207         text_model_activate(entry->model);
 208 }
 209
 210 static void
 211 text_entry_deactivate(struct text_entry *entry)
 212 {
 213         text_model_deactivate(entry->model);
 214 }
 215
 216 static void
 217 button_handler(struct widget *widget,
 218                struct input *input, uint32_t time,
 219                uint32_t button,
 220                enum wl_pointer_button_state state, void *data)
 221 {
 222         struct editor *editor = data;
 223         struct rectangle allocation;
 224         int32_t x, y;
 225
 226         if (state != WL_POINTER_BUTTON_STATE_PRESSED || button != BTN_LEFT) {
 227                 return;
 228         }
 229
 230         input_get_position(input, &x, &y);
 231
 232         widget_get_allocation(editor->widget, &allocation);
 233         x -= allocation.x;
 234         y -= allocation.y;
 235
 236         editor->entry->active = 0;
 237         editor->editor->active = 0;
 238
 239         editor->entry->active = rectangle_contains(&editor->entry->allocation, x, y);
 240         editor->editor->active = rectangle_contains(&editor->editor->allocation, x, y);
 241
 242         if (editor->entry->active) {
 243                 text_entry_activate(editor->entry);
 244         } else {
 245                 text_entry_deactivate(editor->entry);
 246         }
 247         if (editor->editor->active) {
 248                 text_entry_activate(editor->editor);
 249         } else {
 250                 text_entry_deactivate(editor->editor);
 251         }
 252
 253         widget_schedule_redraw(widget);
 254 }
 255
 256 static void
 257 global_handler(struct wl_display *display, uint32_t id,
 258                const char *interface, uint32_t version, void *data)
 259 {
 260         struct editor *editor = data;
 261
 262         if (!strcmp(interface, "input_method")) {
 263                 editor->input_method = wl_display_bind(display, id, &input_method_interface);
 264         }
 265 }
 266
 267 int
 268 main(int argc, char *argv[])
 269 {
 270         struct editor editor;
 271
 272         editor.display = display_create(argc, argv);
 273         if (editor.display == NULL) {
 274                 fprintf(stderr, "failed to create display: %m\n");
 275                 return -1;
 276         }
 277         wl_display_add_global_listener(display_get_display(editor.display),
 278                                        global_handler, &editor);
 279
 280
 281         editor.window = window_create(editor.display);
 282         editor.widget = frame_create(editor.window, &editor);
 283
 284         editor.entry = text_entry_create(&editor, "Entry");
 285         editor.editor = text_entry_create(&editor, "Editor");
 286
 287         window_set_title(editor.window, "Text Editor");
 288
 289         widget_set_redraw_handler(editor.widget, redraw_handler);
 290         widget_set_resize_handler(editor.widget, resize_handler);
 291         widget_set_button_handler(editor.widget, button_handler);
 292
 293         window_schedule_resize(editor.window, 500, 400);
 294
 295         display_run(editor.display);
 296
 297         text_entry_destroy(editor.entry);
 298         text_entry_destroy(editor.editor);
 299
 300         return 0;
 301 }