clients/editor.c

   1 /*
   2  * Copyright © 2012 Openismus GmbH
   3  * Copyright © 2012 Intel Corporation
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and
   6  * its documentation for any purpose is hereby granted without fee, provided
   7  * that the above copyright notice appear in all copies and that both that
   8  * copyright notice and this permission notice appear in supporting
   9  * documentation, and that the name of the copyright holders not be used in
  10  * advertising or publicity pertaining to distribution of the software
  11  * without specific, written prior permission.  The copyright holders make
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  18  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  20  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  21  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  */
  23
  24 #include <assert.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include <linux/input.h>
  30 #include <cairo.h>
  31
  32 #include "window.h"
  33 #include "text-client-protocol.h"
  34
  35 static const char *font_name = "sans-serif";
  36 static int font_size = 14;
  37
  38 struct text_layout {
  39         cairo_glyph_t *glyphs;
  40         int num_glyphs;
  41         cairo_text_cluster_t *clusters;
  42         int num_clusters;
  43         cairo_text_cluster_flags_t cluster_flags;
  44         cairo_scaled_font_t *font;
  45 };
  46
  47 struct text_entry {
  48         struct widget *widget;
  49         struct window *window;
  50         char *text;
  51         int active;
  52         uint32_t cursor;
  53         uint32_t anchor;
  54         char *preedit_text;
  55         uint32_t preedit_cursor;
  56         struct text_model *model;
  57         struct text_layout *layout;
  58 };
  59
  60 struct editor {
  61         struct text_model_factory *text_model_factory;
  62         struct display *display;
  63         struct window *window;
  64         struct widget *widget;
  65         struct text_entry *entry;
  66         struct text_entry *editor;
  67 };
  68
  69 static struct text_layout *
  70 text_layout_create(void)
  71 {
  72         struct text_layout *layout;
  73         cairo_surface_t *surface;
  74         cairo_t *cr;
  75
  76         layout = malloc(sizeof *layout);
  77         if (!layout)
  78                 return NULL;
  79
  80         layout->glyphs = NULL;
  81         layout->num_glyphs = 0;
  82
  83         layout->clusters = NULL;
  84         layout->num_clusters = 0;
  85
  86         surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
  87         cr = cairo_create(surface);
  88         cairo_set_font_size(cr, font_size);
  89         cairo_select_font_face(cr, font_name, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
  90         layout->font = cairo_get_scaled_font(cr);
  91         cairo_scaled_font_reference(layout->font);
  92
  93         cairo_destroy(cr);
  94         cairo_surface_destroy(surface);
  95
  96         return layout;
  97 }
  98
  99 static void
 100 text_layout_destroy(struct text_layout *layout)
 101 {
 102         if (layout->glyphs)
 103                 cairo_glyph_free(layout->glyphs);
 104
 105         if (layout->clusters)
 106                 cairo_text_cluster_free(layout->clusters);
 107
 108         cairo_scaled_font_destroy(layout->font);
 109
 110         free(layout);
 111 }
 112
 113 static void
 114 text_layout_set_text(struct text_layout *layout,
 115                      const char *text)
 116 {
 117         if (layout->glyphs)
 118                 cairo_glyph_free(layout->glyphs);
 119
 120         if (layout->clusters)
 121                 cairo_text_cluster_free(layout->clusters);
 122
 123         layout->glyphs = NULL;
 124         layout->num_glyphs = 0;
 125         layout->clusters = NULL;
 126         layout->num_clusters = 0;
 127
 128         cairo_scaled_font_text_to_glyphs(layout->font, 0, 0, text, -1,
 129                                          &layout->glyphs, &layout->num_glyphs,
 130                                          &layout->clusters, &layout->num_clusters,
 131                                          &layout->cluster_flags);
 132 }
 133
 134 static void
 135 text_layout_draw(struct text_layout *layout, cairo_t *cr)
 136 {
 137         cairo_save(cr);
 138         cairo_set_scaled_font(cr, layout->font);
 139         cairo_show_glyphs(cr, layout->glyphs, layout->num_glyphs);
 140         cairo_restore(cr);
 141 }
 142
 143 static void
 144 text_layout_extents(struct text_layout *layout, cairo_text_extents_t *extents)
 145 {
 146         cairo_scaled_font_glyph_extents(layout->font,
 147                                         layout->glyphs, layout->num_glyphs,
 148                                         extents);
 149 }
 150
 151 static int
 152 text_layout_xy_to_index(struct text_layout *layout, double x, double y)
 153 {
 154         cairo_text_extents_t extents;
 155         int i;
 156
 157         cairo_scaled_font_glyph_extents(layout->font,
 158                                         layout->glyphs, layout->num_glyphs,
 159                                         &extents);
 160
 161         for (i = 1; i < layout->num_glyphs; i++) {
 162                 if (layout->glyphs[i].x >= x) {
 163                         return i - 1;
 164                 }
 165         }
 166
 167         if (x >= layout->glyphs[layout->num_glyphs - 1].x && x < extents.width)
 168                 return layout->num_glyphs - 1;
 169
 170         return layout->num_glyphs;
 171 }
 172
 173 static void
 174 text_layout_index_to_pos(struct text_layout *layout, uint32_t index, cairo_rectangle_t *pos)
 175 {
 176         cairo_text_extents_t extents;
 177
 178         if (!pos)
 179                 return;
 180
 181         cairo_scaled_font_glyph_extents(layout->font,
 182                                         layout->glyphs, layout->num_glyphs,
 183                                         &extents);
 184
 185         if ((int)index >= layout->num_glyphs) {
 186                 pos->x = extents.x_advance;
 187                 pos->y = layout->num_glyphs ? layout->glyphs[layout->num_glyphs - 1].y : 0;
 188                 pos->width = 1;
 189                 pos->height = extents.height;
 190                 return;
 191         }
 192
 193         pos->x = layout->glyphs[index].x;
 194         pos->y = layout->glyphs[index].y;
 195         pos->width = (int)index < layout->num_glyphs - 1 ? layout->glyphs[index + 1].x : extents.x_advance - pos->x;
 196         pos->height = extents.height;
 197 }
 198
 199 static void
 200 text_layout_get_cursor_pos(struct text_layout *layout, int index, cairo_rectangle_t *pos)
 201 {
 202         text_layout_index_to_pos(layout, index, pos);
 203         pos->width = 1;
 204 }
 205
 206 static void text_entry_redraw_handler(struct widget *widget, void *data);
 207 static void text_entry_button_handler(struct widget *widget,
 208                                       struct input *input, uint32_t time,
 209                                       uint32_t button,
 210                                       enum wl_pointer_button_state state, void *data);
 211 static void text_entry_insert_at_cursor(struct text_entry *entry, const char *text);
 212 static void text_entry_set_preedit(struct text_entry *entry,
 213                                    const char *preedit_text,
 214                                    int preedit_cursor);
 215 static void text_entry_delete_text(struct text_entry *entry,
 216                                    uint32_t index, uint32_t length);
 217
 218 static void
 219 text_model_commit_string(void *data,
 220                          struct text_model *text_model,
 221                          const char *text,
 222                          uint32_t index)
 223 {
 224         struct text_entry *entry = data;
 225
 226         if (index > strlen(text)) {
 227                 fprintf(stderr, "Invalid cursor index %d\n", index);
 228                 index = strlen(text);
 229         }
 230
 231         text_entry_insert_at_cursor(entry, text);
 232
 233         widget_schedule_redraw(entry->widget);
 234 }
 235
 236 static void
 237 text_model_preedit_string(void *data,
 238                           struct text_model *text_model,
 239                           const char *text,
 240                           uint32_t index)
 241 {
 242         struct text_entry *entry = data;
 243
 244         if (index > strlen(text)) {
 245                 fprintf(stderr, "Invalid cursor index %d\n", index);
 246                 index = strlen(text);
 247         }
 248
 249         text_entry_set_preedit(entry, text, index);
 250
 251         widget_schedule_redraw(entry->widget);
 252 }
 253
 254 static void
 255 text_model_delete_surrounding_text(void *data,
 256                                    struct text_model *text_model,
 257                                    int32_t index,
 258                                    uint32_t length)
 259 {
 260         struct text_entry *entry = data;
 261         uint32_t cursor_index = index + entry->cursor;
 262
 263         if (cursor_index > strlen(entry->text)) {
 264                 fprintf(stderr, "Invalid cursor index %d\n", index);
 265                 return;
 266         }
 267
 268         if (cursor_index + length > strlen(entry->text)) {
 269                 fprintf(stderr, "Invalid length %d\n", length);
 270                 return;
 271         }
 272
 273         if (length == 0)
 274                 return;
 275
 276         text_entry_delete_text(entry, cursor_index, length);
 277 }
 278
 279 static void
 280 text_model_preedit_styling(void *data,
 281                            struct text_model *text_model)
 282 {
 283 }
 284
 285 static void
 286 text_model_key(void *data,
 287                struct text_model *text_model,
 288                uint32_t key,
 289                uint32_t state)
 290 {
 291         const char *state_label;
 292         const char *key_label;
 293
 294         if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
 295                 state_label = "pressed";
 296         } else {
 297                 state_label = "released";
 298         }
 299
 300         switch (key) {
 301                 case XKB_KEY_Tab:
 302                         key_label = "Tab";
 303                         break;
 304                 case XKB_KEY_KP_Enter:
 305                         key_label = "Enter";
 306                         break;
 307                 default:
 308                         key_label = "Unknown";
 309         }
 310
 311         fprintf(stderr, "%s key was %s.\n", key_label, state_label);
 312 }
 313
 314 static void
 315 text_model_selection_replacement(void *data,
 316                                  struct text_model *text_model)
 317 {
 318 }
 319
 320 static void
 321 text_model_direction(void *data,
 322                      struct text_model *text_model)
 323 {
 324 }
 325
 326 static void
 327 text_model_locale(void *data,
 328                   struct text_model *text_model)
 329 {
 330 }
 331
 332 static void
 333 text_model_activated(void *data,
 334                      struct text_model *text_model)
 335 {
 336         struct text_entry *entry = data;
 337
 338         entry->active = 1;
 339
 340         widget_schedule_redraw(entry->widget);
 341 }
 342
 343 static void
 344 text_model_deactivated(void *data,
 345                        struct text_model *text_model)
 346 {
 347         struct text_entry *entry = data;
 348
 349         entry->active = 0;
 350
 351         widget_schedule_redraw(entry->widget);
 352 }
 353
 354 static const struct text_model_listener text_model_listener = {
 355         text_model_commit_string,
 356         text_model_preedit_string,
 357         text_model_delete_surrounding_text,
 358         text_model_preedit_styling,
 359         text_model_key,
 360         text_model_selection_replacement,
 361         text_model_direction,
 362         text_model_locale,
 363         text_model_activated,
 364         text_model_deactivated
 365 };
 366
 367 static struct text_entry*
 368 text_entry_create(struct editor *editor, const char *text)
 369 {
 370         struct text_entry *entry;
 371
 372         entry = malloc(sizeof *entry);
 373
 374         entry->widget = widget_add_widget(editor->widget, entry);
 375         entry->window = editor->window;
 376         entry->text = strdup(text);
 377         entry->active = 0;
 378         entry->cursor = strlen(text);
 379         entry->anchor = entry->cursor;
 380         entry->preedit_text = NULL;
 381         entry->preedit_cursor = 0;
 382         entry->model = text_model_factory_create_text_model(editor->text_model_factory);
 383         text_model_add_listener(entry->model, &text_model_listener, entry);
 384
 385         entry->layout = text_layout_create();
 386         text_layout_set_text(entry->layout, entry->text);
 387
 388         widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
 389         widget_set_button_handler(entry->widget, text_entry_button_handler);
 390
 391         return entry;
 392 }
 393
 394 static void
 395 text_entry_destroy(struct text_entry *entry)
 396 {
 397         widget_destroy(entry->widget);
 398         text_model_destroy(entry->model);
 399         text_layout_destroy(entry->layout);
 400         free(entry->text);
 401         free(entry);
 402 }
 403
 404 static void
 405 redraw_handler(struct widget *widget, void *data)
 406 {
 407         struct editor *editor = data;
 408         cairo_surface_t *surface;
 409         struct rectangle allocation;
 410         cairo_t *cr;
 411
 412         surface = window_get_surface(editor->window);
 413         widget_get_allocation(editor->widget, &allocation);
 414
 415         cr = cairo_create(surface);
 416         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 417         cairo_clip(cr);
 418
 419         cairo_translate(cr, allocation.x, allocation.y);
 420
 421         /* Draw background */
 422         cairo_push_group(cr);
 423         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 424         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 425         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 426         cairo_fill(cr);
 427
 428         cairo_pop_group_to_source(cr);
 429         cairo_paint(cr);
 430
 431         cairo_destroy(cr);
 432         cairo_surface_destroy(surface);
 433 }
 434
 435 static void
 436 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 437                     int32_t width, int32_t height)
 438 {
 439         widget_set_allocation(entry->widget, x, y, width, height);
 440 }
 441
 442 static void
 443 resize_handler(struct widget *widget,
 444                int32_t width, int32_t height, void *data)
 445 {
 446         struct editor *editor = data;
 447         struct rectangle allocation;
 448
 449         widget_get_allocation(editor->widget, &allocation);
 450
 451         text_entry_allocate(editor->entry,
 452                             allocation.x + 20, allocation.y + 20,
 453                             width - 40, height / 2 - 40);
 454         text_entry_allocate(editor->editor,
 455                             allocation.x + 20, allocation.y + height / 2 + 20,
 456                             width - 40, height / 2 - 40);
 457 }
 458
 459 static void
 460 text_entry_activate(struct text_entry *entry,
 461                     struct wl_seat *seat)
 462 {
 463         struct wl_surface *surface = window_get_wl_surface(entry->window);
 464
 465         text_model_activate(entry->model,
 466                             seat,
 467                             surface);
 468 }
 469
 470 static void
 471 text_entry_deactivate(struct text_entry *entry,
 472                       struct wl_seat *seat)
 473 {
 474         text_model_deactivate(entry->model,
 475                               seat);
 476 }
 477
 478 static void
 479 text_entry_update_layout(struct text_entry *entry)
 480 {
 481         char *text;
 482
 483         assert(((unsigned int)entry->cursor) <= strlen(entry->text));
 484
 485         if (!entry->preedit_text) {
 486                 text_layout_set_text(entry->layout, entry->text);
 487                 return;
 488         }
 489
 490         text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
 491         strncpy(text, entry->text, entry->cursor);
 492         strcpy(text + entry->cursor, entry->preedit_text);
 493         strcpy(text + entry->cursor + strlen(entry->preedit_text),
 494                entry->text + entry->cursor);
 495
 496         text_layout_set_text(entry->layout, text);
 497         free(text);
 498
 499         widget_schedule_redraw(entry->widget);
 500
 501         text_model_set_surrounding_text(entry->model,
 502                                         entry->text,
 503                                         entry->cursor,
 504                                         entry->anchor);
 505 }
 506
 507 static void
 508 text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
 509 {
 510         char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
 511
 512         strncpy(new_text, entry->text, entry->cursor);
 513         strcpy(new_text + entry->cursor, text);
 514         strcpy(new_text + entry->cursor + strlen(text),
 515                entry->text + entry->cursor);
 516
 517         free(entry->text);
 518         entry->text = new_text;
 519         entry->cursor += strlen(text);
 520         entry->anchor += strlen(text);
 521
 522         text_entry_update_layout(entry);
 523 }
 524
 525 static void
 526 text_entry_set_preedit(struct text_entry *entry,
 527                        const char *preedit_text,
 528                        int preedit_cursor)
 529 {
 530         if (entry->preedit_text) {
 531                 free(entry->preedit_text);
 532                 entry->preedit_text = NULL;
 533                 entry->preedit_cursor = 0;
 534         }
 535
 536         if (!preedit_text)
 537                 return;
 538
 539         entry->preedit_text = strdup(preedit_text);
 540         entry->preedit_cursor = preedit_cursor;
 541
 542         text_entry_update_layout(entry);
 543 }
 544
 545 static void
 546 text_entry_set_cursor_position(struct text_entry *entry,
 547                                int32_t x, int32_t y)
 548 {
 549         entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 550
 551         if (entry->cursor >= entry->preedit_cursor) {
 552                 entry->cursor -= entry->preedit_cursor;
 553         }
 554
 555         text_entry_update_layout(entry);
 556
 557         widget_schedule_redraw(entry->widget);
 558 }
 559
 560 static void
 561 text_entry_set_anchor_position(struct text_entry *entry,
 562                                int32_t x, int32_t y)
 563 {
 564         entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
 565
 566         widget_schedule_redraw(entry->widget);
 567 }
 568
 569 static void
 570 text_entry_delete_text(struct text_entry *entry,
 571                        uint32_t index, uint32_t length)
 572 {
 573         if (entry->cursor > index)
 574                 entry->cursor -= length;
 575
 576         entry->text[index] = '\0';
 577         strcat(entry->text, entry->text + index + length);
 578
 579         text_entry_update_layout(entry);
 580
 581         widget_schedule_redraw(entry->widget);
 582 }
 583
 584 static void
 585 text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
 586 {
 587         cairo_text_extents_t extents;
 588         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 589         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 590         cairo_rectangle_t start;
 591         cairo_rectangle_t end;
 592
 593         if (entry->anchor == entry->cursor)
 594                 return;
 595
 596         text_layout_extents(entry->layout, &extents);
 597
 598         text_layout_index_to_pos(entry->layout, start_index, &start);
 599         text_layout_index_to_pos(entry->layout, end_index, &end);
 600
 601         cairo_save (cr);
 602
 603         cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
 604         cairo_rectangle(cr,
 605                         start.x, extents.y_bearing + extents.height + 2,
 606                         end.x - start.x, -extents.height - 4);
 607         cairo_fill(cr);
 608
 609         cairo_rectangle(cr,
 610                         start.x, extents.y_bearing + extents.height,
 611                         end.x - start.x, -extents.height);
 612         cairo_clip(cr);
 613         cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
 614         text_layout_draw(entry->layout, cr);
 615
 616         cairo_restore (cr);
 617 }
 618
 619 static void
 620 text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
 621 {
 622         cairo_text_extents_t extents;
 623         cairo_rectangle_t cursor_pos;
 624
 625         text_layout_extents(entry->layout, &extents);
 626         text_layout_get_cursor_pos(entry->layout,
 627                                    entry->cursor + entry->preedit_cursor,
 628                                    &cursor_pos);
 629
 630         cairo_set_line_width(cr, 1.0);
 631         cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
 632         cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
 633         cairo_stroke(cr);
 634 }
 635
 636 static void
 637 text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
 638 {
 639         cairo_text_extents_t extents;
 640         cairo_rectangle_t start;
 641         cairo_rectangle_t end;
 642
 643         if (!entry->preedit_text)
 644                 return;
 645
 646         text_layout_extents(entry->layout, &extents);
 647
 648         text_layout_index_to_pos(entry->layout, entry->cursor, &start);
 649         text_layout_index_to_pos(entry->layout,
 650                                  entry->cursor + strlen(entry->preedit_text),
 651                                  &end);
 652
 653         cairo_save (cr);
 654
 655         cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
 656         cairo_rectangle(cr,
 657                         start.x, 0,
 658                         end.x - start.x, 1);
 659         cairo_fill(cr);
 660
 661         cairo_restore (cr);
 662 }
 663
 664 static void
 665 text_entry_redraw_handler(struct widget *widget, void *data)
 666 {
 667         struct text_entry *entry = data;
 668         cairo_surface_t *surface;
 669         struct rectangle allocation;
 670         cairo_t *cr;
 671
 672         surface = window_get_surface(entry->window);
 673         widget_get_allocation(entry->widget, &allocation);
 674
 675         cr = cairo_create(surface);
 676         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 677         cairo_clip(cr);
 678
 679         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 680
 681         cairo_push_group(cr);
 682         cairo_translate(cr, allocation.x, allocation.y);
 683
 684         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 685         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 686         cairo_fill(cr);
 687
 688         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 689
 690         if (entry->active) {
 691                 cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 692                 cairo_set_line_width (cr, 3);
 693                 cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
 694                 cairo_stroke(cr);
 695         }
 696
 697         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 698
 699         cairo_translate(cr, 10, allocation.height / 2);
 700         text_layout_draw(entry->layout, cr);
 701
 702         text_entry_draw_selection(entry, cr);
 703
 704         text_entry_draw_cursor(entry, cr);
 705
 706         text_entry_draw_preedit(entry, cr);
 707
 708         cairo_pop_group_to_source(cr);
 709         cairo_paint(cr);
 710
 711         cairo_destroy(cr);
 712         cairo_surface_destroy(surface);
 713 }
 714
 715 static int
 716 text_entry_motion_handler(struct widget *widget,
 717                           struct input *input, uint32_t time,
 718                           float x, float y, void *data)
 719 {
 720         struct text_entry *entry = data;
 721         struct rectangle allocation;
 722
 723         widget_get_allocation(entry->widget, &allocation);
 724
 725         text_entry_set_cursor_position(entry,
 726                                        x - allocation.x,
 727                                        y - allocation.y);
 728
 729         return CURSOR_IBEAM;
 730 }
 731
 732 static void
 733 text_entry_button_handler(struct widget *widget,
 734                           struct input *input, uint32_t time,
 735                           uint32_t button,
 736                           enum wl_pointer_button_state state, void *data)
 737 {
 738         struct text_entry *entry = data;
 739         struct rectangle allocation;
 740         int32_t x, y;
 741
 742         widget_get_allocation(entry->widget, &allocation);
 743         input_get_position(input, &x, &y);
 744
 745         if (button != BTN_LEFT) {
 746                 return;
 747         }
 748
 749         text_entry_set_cursor_position(entry,
 750                                        x - allocation.x,
 751                                        y - allocation.y);
 752
 753         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 754                 struct wl_seat *seat = input_get_seat(input);
 755
 756                 text_entry_activate(entry, seat);
 757
 758                 text_entry_set_anchor_position(entry,
 759                                                x - allocation.x,
 760                                                y - allocation.y);
 761
 762                 widget_set_motion_handler(entry->widget, text_entry_motion_handler);
 763         } else {
 764                 widget_set_motion_handler(entry->widget, NULL);
 765         }
 766 }
 767
 768 static void
 769 editor_button_handler(struct widget *widget,
 770                       struct input *input, uint32_t time,
 771                       uint32_t button,
 772                       enum wl_pointer_button_state state, void *data)
 773 {
 774         struct editor *editor = data;
 775
 776         if (button != BTN_LEFT) {
 777                 return;
 778         }
 779
 780         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 781                 struct wl_seat *seat = input_get_seat(input);
 782
 783                 text_entry_deactivate(editor->entry, seat);
 784                 text_entry_deactivate(editor->editor, seat);
 785         }
 786 }
 787
 788 static void
 789 global_handler(struct wl_display *display, uint32_t id,
 790                const char *interface, uint32_t version, void *data)
 791 {
 792         struct editor *editor = data;
 793
 794         if (!strcmp(interface, "text_model_factory")) {
 795                 editor->text_model_factory = wl_display_bind(display, id,
 796                                                              &text_model_factory_interface);
 797         }
 798 }
 799
 800 int
 801 main(int argc, char *argv[])
 802 {
 803         struct editor editor;
 804
 805         editor.display = display_create(argc, argv);
 806         if (editor.display == NULL) {
 807                 fprintf(stderr, "failed to create display: %m\n");
 808                 return -1;
 809         }
 810         wl_display_add_global_listener(display_get_display(editor.display),
 811                                        global_handler, &editor);
 812
 813
 814         editor.window = window_create(editor.display);
 815         editor.widget = frame_create(editor.window, &editor);
 816
 817         editor.entry = text_entry_create(&editor, "Entry");
 818         editor.editor = text_entry_create(&editor, "Editor");
 819         text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
 820
 821         window_set_title(editor.window, "Text Editor");
 822
 823         widget_set_redraw_handler(editor.widget, redraw_handler);
 824         widget_set_resize_handler(editor.widget, resize_handler);
 825         widget_set_button_handler(editor.widget, editor_button_handler);
 826
 827         window_schedule_resize(editor.window, 500, 400);
 828
 829         display_run(editor.display);
 830
 831         text_entry_destroy(editor.entry);
 832         text_entry_destroy(editor.editor);
 833
 834         return 0;
 835 }