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 {
 289 }
 290
 291 static void
 292 text_model_selection_replacement(void *data,
 293                                  struct text_model *text_model)
 294 {
 295 }
 296
 297 static void
 298 text_model_direction(void *data,
 299                      struct text_model *text_model)
 300 {
 301 }
 302
 303 static void
 304 text_model_locale(void *data,
 305                   struct text_model *text_model)
 306 {
 307 }
 308
 309 static void
 310 text_model_activated(void *data,
 311                      struct text_model *text_model)
 312 {
 313         struct text_entry *entry = data;
 314
 315         entry->active = 1;
 316
 317         widget_schedule_redraw(entry->widget);
 318 }
 319
 320 static void
 321 text_model_deactivated(void *data,
 322                        struct text_model *text_model)
 323 {
 324         struct text_entry *entry = data;
 325
 326         entry->active = 0;
 327
 328         widget_schedule_redraw(entry->widget);
 329 }
 330
 331 static const struct text_model_listener text_model_listener = {
 332         text_model_commit_string,
 333         text_model_preedit_string,
 334         text_model_delete_surrounding_text,
 335         text_model_preedit_styling,
 336         text_model_key,
 337         text_model_selection_replacement,
 338         text_model_direction,
 339         text_model_locale,
 340         text_model_activated,
 341         text_model_deactivated
 342 };
 343
 344 static struct text_entry*
 345 text_entry_create(struct editor *editor, const char *text)
 346 {
 347         struct text_entry *entry;
 348
 349         entry = malloc(sizeof *entry);
 350
 351         entry->widget = widget_add_widget(editor->widget, entry);
 352         entry->window = editor->window;
 353         entry->text = strdup(text);
 354         entry->active = 0;
 355         entry->cursor = strlen(text);
 356         entry->anchor = entry->cursor;
 357         entry->preedit_text = NULL;
 358         entry->preedit_cursor = 0;
 359         entry->model = text_model_factory_create_text_model(editor->text_model_factory);
 360         text_model_add_listener(entry->model, &text_model_listener, entry);
 361
 362         entry->layout = text_layout_create();
 363         text_layout_set_text(entry->layout, entry->text);
 364
 365         widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
 366         widget_set_button_handler(entry->widget, text_entry_button_handler);
 367
 368         return entry;
 369 }
 370
 371 static void
 372 text_entry_destroy(struct text_entry *entry)
 373 {
 374         widget_destroy(entry->widget);
 375         text_model_destroy(entry->model);
 376         text_layout_destroy(entry->layout);
 377         free(entry->text);
 378         free(entry);
 379 }
 380
 381 static void
 382 redraw_handler(struct widget *widget, void *data)
 383 {
 384         struct editor *editor = data;
 385         cairo_surface_t *surface;
 386         struct rectangle allocation;
 387         cairo_t *cr;
 388
 389         surface = window_get_surface(editor->window);
 390         widget_get_allocation(editor->widget, &allocation);
 391
 392         cr = cairo_create(surface);
 393         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 394         cairo_clip(cr);
 395
 396         cairo_translate(cr, allocation.x, allocation.y);
 397
 398         /* Draw background */
 399         cairo_push_group(cr);
 400         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 401         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 402         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 403         cairo_fill(cr);
 404
 405         cairo_pop_group_to_source(cr);
 406         cairo_paint(cr);
 407
 408         cairo_destroy(cr);
 409         cairo_surface_destroy(surface);
 410 }
 411
 412 static void
 413 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 414                     int32_t width, int32_t height)
 415 {
 416         widget_set_allocation(entry->widget, x, y, width, height);
 417 }
 418
 419 static void
 420 resize_handler(struct widget *widget,
 421                int32_t width, int32_t height, void *data)
 422 {
 423         struct editor *editor = data;
 424         struct rectangle allocation;
 425
 426         widget_get_allocation(editor->widget, &allocation);
 427
 428         text_entry_allocate(editor->entry,
 429                             allocation.x + 20, allocation.y + 20,
 430                             width - 40, height / 2 - 40);
 431         text_entry_allocate(editor->editor,
 432                             allocation.x + 20, allocation.y + height / 2 + 20,
 433                             width - 40, height / 2 - 40);
 434 }
 435
 436 static void
 437 text_entry_activate(struct text_entry *entry,
 438                     struct wl_seat *seat)
 439 {
 440         struct wl_surface *surface = window_get_wl_surface(entry->window);
 441
 442         text_model_activate(entry->model,
 443                             seat,
 444                             surface);
 445 }
 446
 447 static void
 448 text_entry_deactivate(struct text_entry *entry,
 449                       struct wl_seat *seat)
 450 {
 451         text_model_deactivate(entry->model,
 452                               seat);
 453 }
 454
 455 static void
 456 text_entry_update_layout(struct text_entry *entry)
 457 {
 458         char *text;
 459
 460         assert(((unsigned int)entry->cursor) <= strlen(entry->text));
 461
 462         if (!entry->preedit_text) {
 463                 text_layout_set_text(entry->layout, entry->text);
 464                 return;
 465         }
 466
 467         text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
 468         strncpy(text, entry->text, entry->cursor);
 469         strcpy(text + entry->cursor, entry->preedit_text);
 470         strcpy(text + entry->cursor + strlen(entry->preedit_text),
 471                entry->text + entry->cursor);
 472
 473         text_layout_set_text(entry->layout, text);
 474         free(text);
 475
 476         widget_schedule_redraw(entry->widget);
 477
 478         text_model_set_surrounding_text(entry->model,
 479                                         entry->text,
 480                                         entry->cursor,
 481                                         entry->anchor);
 482 }
 483
 484 static void
 485 text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
 486 {
 487         char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
 488
 489         strncpy(new_text, entry->text, entry->cursor);
 490         strcpy(new_text + entry->cursor, text);
 491         strcpy(new_text + entry->cursor + strlen(text),
 492                entry->text + entry->cursor);
 493
 494         free(entry->text);
 495         entry->text = new_text;
 496         entry->cursor += strlen(text);
 497         entry->anchor += strlen(text);
 498
 499         text_entry_update_layout(entry);
 500 }
 501
 502 static void
 503 text_entry_set_preedit(struct text_entry *entry,
 504                        const char *preedit_text,
 505                        int preedit_cursor)
 506 {
 507         if (entry->preedit_text) {
 508                 free(entry->preedit_text);
 509                 entry->preedit_text = NULL;
 510                 entry->preedit_cursor = 0;
 511         }
 512
 513         if (!preedit_text)
 514                 return;
 515
 516         entry->preedit_text = strdup(preedit_text);
 517         entry->preedit_cursor = preedit_cursor;
 518
 519         text_entry_update_layout(entry);
 520 }
 521
 522 static void
 523 text_entry_set_cursor_position(struct text_entry *entry,
 524                                int32_t x, int32_t y)
 525 {
 526         entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 527
 528         if (entry->cursor >= entry->preedit_cursor) {
 529                 entry->cursor -= entry->preedit_cursor;
 530         }
 531
 532         text_entry_update_layout(entry);
 533
 534         widget_schedule_redraw(entry->widget);
 535 }
 536
 537 static void
 538 text_entry_set_anchor_position(struct text_entry *entry,
 539                                int32_t x, int32_t y)
 540 {
 541         entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
 542
 543         widget_schedule_redraw(entry->widget);
 544 }
 545
 546 static void
 547 text_entry_delete_text(struct text_entry *entry,
 548                        uint32_t index, uint32_t length)
 549 {
 550         if (entry->cursor > index)
 551                 entry->cursor -= length;
 552
 553         entry->text[index] = '\0';
 554         strcat(entry->text, entry->text + index + length);
 555
 556         text_entry_update_layout(entry);
 557
 558         widget_schedule_redraw(entry->widget);
 559 }
 560
 561 static void
 562 text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
 563 {
 564         cairo_text_extents_t extents;
 565         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 566         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 567         cairo_rectangle_t start;
 568         cairo_rectangle_t end;
 569
 570         if (entry->anchor == entry->cursor)
 571                 return;
 572
 573         text_layout_extents(entry->layout, &extents);
 574
 575         text_layout_index_to_pos(entry->layout, start_index, &start);
 576         text_layout_index_to_pos(entry->layout, end_index, &end);
 577
 578         cairo_save (cr);
 579
 580         cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
 581         cairo_rectangle(cr,
 582                         start.x, extents.y_bearing + extents.height + 2,
 583                         end.x - start.x, -extents.height - 4);
 584         cairo_fill(cr);
 585
 586         cairo_rectangle(cr,
 587                         start.x, extents.y_bearing + extents.height,
 588                         end.x - start.x, -extents.height);
 589         cairo_clip(cr);
 590         cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
 591         text_layout_draw(entry->layout, cr);
 592
 593         cairo_restore (cr);
 594 }
 595
 596 static void
 597 text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
 598 {
 599         cairo_text_extents_t extents;
 600         cairo_rectangle_t cursor_pos;
 601
 602         text_layout_extents(entry->layout, &extents);
 603         text_layout_get_cursor_pos(entry->layout,
 604                                    entry->cursor + entry->preedit_cursor,
 605                                    &cursor_pos);
 606
 607         cairo_set_line_width(cr, 1.0);
 608         cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
 609         cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
 610         cairo_stroke(cr);
 611 }
 612
 613 static void
 614 text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
 615 {
 616         cairo_text_extents_t extents;
 617         cairo_rectangle_t start;
 618         cairo_rectangle_t end;
 619
 620         if (!entry->preedit_text)
 621                 return;
 622
 623         text_layout_extents(entry->layout, &extents);
 624
 625         text_layout_index_to_pos(entry->layout, entry->cursor, &start);
 626         text_layout_index_to_pos(entry->layout,
 627                                  entry->cursor + strlen(entry->preedit_text),
 628                                  &end);
 629
 630         cairo_save (cr);
 631
 632         cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
 633         cairo_rectangle(cr,
 634                         start.x, 0,
 635                         end.x - start.x, 1);
 636         cairo_fill(cr);
 637
 638         cairo_restore (cr);
 639 }
 640
 641 static void
 642 text_entry_redraw_handler(struct widget *widget, void *data)
 643 {
 644         struct text_entry *entry = data;
 645         cairo_surface_t *surface;
 646         struct rectangle allocation;
 647         cairo_t *cr;
 648
 649         surface = window_get_surface(entry->window);
 650         widget_get_allocation(entry->widget, &allocation);
 651
 652         cr = cairo_create(surface);
 653         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 654         cairo_clip(cr);
 655
 656         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 657
 658         cairo_push_group(cr);
 659         cairo_translate(cr, allocation.x, allocation.y);
 660
 661         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 662         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 663         cairo_fill(cr);
 664
 665         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 666
 667         if (entry->active) {
 668                 cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 669                 cairo_set_line_width (cr, 3);
 670                 cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
 671                 cairo_stroke(cr);
 672         }
 673
 674         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 675
 676         cairo_translate(cr, 10, allocation.height / 2);
 677         text_layout_draw(entry->layout, cr);
 678
 679         text_entry_draw_selection(entry, cr);
 680
 681         text_entry_draw_cursor(entry, cr);
 682
 683         text_entry_draw_preedit(entry, cr);
 684
 685         cairo_pop_group_to_source(cr);
 686         cairo_paint(cr);
 687
 688         cairo_destroy(cr);
 689         cairo_surface_destroy(surface);
 690 }
 691
 692 static int
 693 text_entry_motion_handler(struct widget *widget,
 694                           struct input *input, uint32_t time,
 695                           float x, float y, void *data)
 696 {
 697         struct text_entry *entry = data;
 698         struct rectangle allocation;
 699
 700         widget_get_allocation(entry->widget, &allocation);
 701
 702         text_entry_set_cursor_position(entry,
 703                                        x - allocation.x,
 704                                        y - allocation.y);
 705
 706         return CURSOR_IBEAM;
 707 }
 708
 709 static void
 710 text_entry_button_handler(struct widget *widget,
 711                           struct input *input, uint32_t time,
 712                           uint32_t button,
 713                           enum wl_pointer_button_state state, void *data)
 714 {
 715         struct text_entry *entry = data;
 716         struct rectangle allocation;
 717         int32_t x, y;
 718
 719         widget_get_allocation(entry->widget, &allocation);
 720         input_get_position(input, &x, &y);
 721
 722         if (button != BTN_LEFT) {
 723                 return;
 724         }
 725
 726         text_entry_set_cursor_position(entry,
 727                                        x - allocation.x,
 728                                        y - allocation.y);
 729
 730         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 731                 struct wl_seat *seat = input_get_seat(input);
 732
 733                 text_entry_activate(entry, seat);
 734
 735                 text_entry_set_anchor_position(entry,
 736                                                x - allocation.x,
 737                                                y - allocation.y);
 738
 739                 widget_set_motion_handler(entry->widget, text_entry_motion_handler);
 740         } else {
 741                 widget_set_motion_handler(entry->widget, NULL);
 742         }
 743 }
 744
 745 static void
 746 editor_button_handler(struct widget *widget,
 747                       struct input *input, uint32_t time,
 748                       uint32_t button,
 749                       enum wl_pointer_button_state state, void *data)
 750 {
 751         struct editor *editor = data;
 752
 753         if (button != BTN_LEFT) {
 754                 return;
 755         }
 756
 757         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 758                 struct wl_seat *seat = input_get_seat(input);
 759
 760                 text_entry_deactivate(editor->entry, seat);
 761                 text_entry_deactivate(editor->editor, seat);
 762         }
 763 }
 764
 765 static void
 766 global_handler(struct wl_display *display, uint32_t id,
 767                const char *interface, uint32_t version, void *data)
 768 {
 769         struct editor *editor = data;
 770
 771         if (!strcmp(interface, "text_model_factory")) {
 772                 editor->text_model_factory = wl_display_bind(display, id,
 773                                                              &text_model_factory_interface);
 774         }
 775 }
 776
 777 int
 778 main(int argc, char *argv[])
 779 {
 780         struct editor editor;
 781
 782         editor.display = display_create(argc, argv);
 783         if (editor.display == NULL) {
 784                 fprintf(stderr, "failed to create display: %m\n");
 785                 return -1;
 786         }
 787         wl_display_add_global_listener(display_get_display(editor.display),
 788                                        global_handler, &editor);
 789
 790
 791         editor.window = window_create(editor.display);
 792         editor.widget = frame_create(editor.window, &editor);
 793
 794         editor.entry = text_entry_create(&editor, "Entry");
 795         editor.editor = text_entry_create(&editor, "Editor");
 796         text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
 797
 798         window_set_title(editor.window, "Text Editor");
 799
 800         widget_set_redraw_handler(editor.widget, redraw_handler);
 801         widget_set_resize_handler(editor.widget, resize_handler);
 802         widget_set_button_handler(editor.widget, editor_button_handler);
 803
 804         window_schedule_resize(editor.window, 500, 400);
 805
 806         display_run(editor.display);
 807
 808         text_entry_destroy(editor.entry);
 809         text_entry_destroy(editor.editor);
 810
 811         return 0;
 812 }