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         struct text_entry *entry = data;
 292         const char *state_label;
 293         const char *key_label = "released";
 294
 295         if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
 296                 state_label = "pressed";
 297         }
 298
 299         switch (key) {
 300                 case XKB_KEY_Tab:
 301                         key_label = "Tab";
 302                         break;
 303                 case XKB_KEY_KP_Enter:
 304                         key_label = "Enter";
 305                         break;
 306                 case XKB_KEY_Left:
 307                         if (entry->cursor > 0) {
 308                                 entry->cursor--;
 309                                 entry->anchor = entry->cursor;
 310                                 widget_schedule_redraw(entry->widget);
 311                         }
 312                         break;
 313                 case XKB_KEY_Right:
 314                         if (entry->cursor < strlen(entry->text)) {
 315                                 entry->cursor++;
 316                                 entry->anchor = entry->cursor;
 317                                 widget_schedule_redraw(entry->widget);
 318                         }
 319                         break;
 320                 default:
 321                         key_label = "Unknown";
 322         }
 323
 324         fprintf(stderr, "%s key was %s.\n", key_label, state_label);
 325 }
 326
 327 static void
 328 text_model_selection_replacement(void *data,
 329                                  struct text_model *text_model)
 330 {
 331 }
 332
 333 static void
 334 text_model_direction(void *data,
 335                      struct text_model *text_model)
 336 {
 337 }
 338
 339 static void
 340 text_model_locale(void *data,
 341                   struct text_model *text_model)
 342 {
 343 }
 344
 345 static void
 346 text_model_activated(void *data,
 347                      struct text_model *text_model)
 348 {
 349         struct text_entry *entry = data;
 350
 351         entry->active = 1;
 352
 353         widget_schedule_redraw(entry->widget);
 354 }
 355
 356 static void
 357 text_model_deactivated(void *data,
 358                        struct text_model *text_model)
 359 {
 360         struct text_entry *entry = data;
 361
 362         entry->active = 0;
 363
 364         widget_schedule_redraw(entry->widget);
 365 }
 366
 367 static const struct text_model_listener text_model_listener = {
 368         text_model_commit_string,
 369         text_model_preedit_string,
 370         text_model_delete_surrounding_text,
 371         text_model_preedit_styling,
 372         text_model_key,
 373         text_model_selection_replacement,
 374         text_model_direction,
 375         text_model_locale,
 376         text_model_activated,
 377         text_model_deactivated
 378 };
 379
 380 static struct text_entry*
 381 text_entry_create(struct editor *editor, const char *text)
 382 {
 383         struct text_entry *entry;
 384
 385         entry = malloc(sizeof *entry);
 386
 387         entry->widget = widget_add_widget(editor->widget, entry);
 388         entry->window = editor->window;
 389         entry->text = strdup(text);
 390         entry->active = 0;
 391         entry->cursor = strlen(text);
 392         entry->anchor = entry->cursor;
 393         entry->preedit_text = NULL;
 394         entry->preedit_cursor = 0;
 395         entry->model = text_model_factory_create_text_model(editor->text_model_factory);
 396         text_model_add_listener(entry->model, &text_model_listener, entry);
 397
 398         entry->layout = text_layout_create();
 399         text_layout_set_text(entry->layout, entry->text);
 400
 401         widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
 402         widget_set_button_handler(entry->widget, text_entry_button_handler);
 403
 404         return entry;
 405 }
 406
 407 static void
 408 text_entry_destroy(struct text_entry *entry)
 409 {
 410         widget_destroy(entry->widget);
 411         text_model_destroy(entry->model);
 412         text_layout_destroy(entry->layout);
 413         free(entry->text);
 414         free(entry);
 415 }
 416
 417 static void
 418 redraw_handler(struct widget *widget, void *data)
 419 {
 420         struct editor *editor = data;
 421         cairo_surface_t *surface;
 422         struct rectangle allocation;
 423         cairo_t *cr;
 424
 425         surface = window_get_surface(editor->window);
 426         widget_get_allocation(editor->widget, &allocation);
 427
 428         cr = cairo_create(surface);
 429         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 430         cairo_clip(cr);
 431
 432         cairo_translate(cr, allocation.x, allocation.y);
 433
 434         /* Draw background */
 435         cairo_push_group(cr);
 436         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 437         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 438         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 439         cairo_fill(cr);
 440
 441         cairo_pop_group_to_source(cr);
 442         cairo_paint(cr);
 443
 444         cairo_destroy(cr);
 445         cairo_surface_destroy(surface);
 446 }
 447
 448 static void
 449 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 450                     int32_t width, int32_t height)
 451 {
 452         widget_set_allocation(entry->widget, x, y, width, height);
 453 }
 454
 455 static void
 456 resize_handler(struct widget *widget,
 457                int32_t width, int32_t height, void *data)
 458 {
 459         struct editor *editor = data;
 460         struct rectangle allocation;
 461
 462         widget_get_allocation(editor->widget, &allocation);
 463
 464         text_entry_allocate(editor->entry,
 465                             allocation.x + 20, allocation.y + 20,
 466                             width - 40, height / 2 - 40);
 467         text_entry_allocate(editor->editor,
 468                             allocation.x + 20, allocation.y + height / 2 + 20,
 469                             width - 40, height / 2 - 40);
 470 }
 471
 472 static void
 473 text_entry_activate(struct text_entry *entry,
 474                     struct wl_seat *seat)
 475 {
 476         struct wl_surface *surface = window_get_wl_surface(entry->window);
 477
 478         text_model_activate(entry->model,
 479                             seat,
 480                             surface);
 481 }
 482
 483 static void
 484 text_entry_deactivate(struct text_entry *entry,
 485                       struct wl_seat *seat)
 486 {
 487         text_model_deactivate(entry->model,
 488                               seat);
 489 }
 490
 491 static void
 492 text_entry_update_layout(struct text_entry *entry)
 493 {
 494         char *text;
 495
 496         assert(((unsigned int)entry->cursor) <= strlen(entry->text));
 497
 498         if (!entry->preedit_text) {
 499                 text_layout_set_text(entry->layout, entry->text);
 500                 return;
 501         }
 502
 503         text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
 504         strncpy(text, entry->text, entry->cursor);
 505         strcpy(text + entry->cursor, entry->preedit_text);
 506         strcpy(text + entry->cursor + strlen(entry->preedit_text),
 507                entry->text + entry->cursor);
 508
 509         text_layout_set_text(entry->layout, text);
 510         free(text);
 511
 512         widget_schedule_redraw(entry->widget);
 513
 514         text_model_set_surrounding_text(entry->model,
 515                                         entry->text,
 516                                         entry->cursor,
 517                                         entry->anchor);
 518 }
 519
 520 static void
 521 text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
 522 {
 523         char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
 524
 525         strncpy(new_text, entry->text, entry->cursor);
 526         strcpy(new_text + entry->cursor, text);
 527         strcpy(new_text + entry->cursor + strlen(text),
 528                entry->text + entry->cursor);
 529
 530         free(entry->text);
 531         entry->text = new_text;
 532         entry->cursor += strlen(text);
 533         entry->anchor += strlen(text);
 534
 535         text_entry_update_layout(entry);
 536 }
 537
 538 static void
 539 text_entry_set_preedit(struct text_entry *entry,
 540                        const char *preedit_text,
 541                        int preedit_cursor)
 542 {
 543         if (entry->preedit_text) {
 544                 free(entry->preedit_text);
 545                 entry->preedit_text = NULL;
 546                 entry->preedit_cursor = 0;
 547         }
 548
 549         if (!preedit_text)
 550                 return;
 551
 552         entry->preedit_text = strdup(preedit_text);
 553         entry->preedit_cursor = preedit_cursor;
 554
 555         text_entry_update_layout(entry);
 556 }
 557
 558 static void
 559 text_entry_set_cursor_position(struct text_entry *entry,
 560                                int32_t x, int32_t y)
 561 {
 562         entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 563
 564         text_model_reset(entry->model);
 565
 566         if (entry->cursor >= entry->preedit_cursor) {
 567                 entry->cursor -= entry->preedit_cursor;
 568         }
 569
 570         text_entry_update_layout(entry);
 571
 572         widget_schedule_redraw(entry->widget);
 573 }
 574
 575 static void
 576 text_entry_set_anchor_position(struct text_entry *entry,
 577                                int32_t x, int32_t y)
 578 {
 579         entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
 580
 581         widget_schedule_redraw(entry->widget);
 582 }
 583
 584 static void
 585 text_entry_delete_text(struct text_entry *entry,
 586                        uint32_t index, uint32_t length)
 587 {
 588         if (entry->cursor > index)
 589                 entry->cursor -= length;
 590
 591         entry->text[index] = '\0';
 592         strcat(entry->text, entry->text + index + length);
 593
 594         text_entry_update_layout(entry);
 595
 596         widget_schedule_redraw(entry->widget);
 597 }
 598
 599 static void
 600 text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
 601 {
 602         cairo_text_extents_t extents;
 603         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 604         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 605         cairo_rectangle_t start;
 606         cairo_rectangle_t end;
 607
 608         if (entry->anchor == entry->cursor)
 609                 return;
 610
 611         text_layout_extents(entry->layout, &extents);
 612
 613         text_layout_index_to_pos(entry->layout, start_index, &start);
 614         text_layout_index_to_pos(entry->layout, end_index, &end);
 615
 616         cairo_save (cr);
 617
 618         cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
 619         cairo_rectangle(cr,
 620                         start.x, extents.y_bearing + extents.height + 2,
 621                         end.x - start.x, -extents.height - 4);
 622         cairo_fill(cr);
 623
 624         cairo_rectangle(cr,
 625                         start.x, extents.y_bearing + extents.height,
 626                         end.x - start.x, -extents.height);
 627         cairo_clip(cr);
 628         cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
 629         text_layout_draw(entry->layout, cr);
 630
 631         cairo_restore (cr);
 632 }
 633
 634 static void
 635 text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
 636 {
 637         cairo_text_extents_t extents;
 638         cairo_rectangle_t cursor_pos;
 639
 640         text_layout_extents(entry->layout, &extents);
 641         text_layout_get_cursor_pos(entry->layout,
 642                                    entry->cursor + entry->preedit_cursor,
 643                                    &cursor_pos);
 644
 645         cairo_set_line_width(cr, 1.0);
 646         cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
 647         cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
 648         cairo_stroke(cr);
 649 }
 650
 651 static void
 652 text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
 653 {
 654         cairo_text_extents_t extents;
 655         cairo_rectangle_t start;
 656         cairo_rectangle_t end;
 657
 658         if (!entry->preedit_text)
 659                 return;
 660
 661         text_layout_extents(entry->layout, &extents);
 662
 663         text_layout_index_to_pos(entry->layout, entry->cursor, &start);
 664         text_layout_index_to_pos(entry->layout,
 665                                  entry->cursor + strlen(entry->preedit_text),
 666                                  &end);
 667
 668         cairo_save (cr);
 669
 670         cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
 671         cairo_rectangle(cr,
 672                         start.x, 0,
 673                         end.x - start.x, 1);
 674         cairo_fill(cr);
 675
 676         cairo_restore (cr);
 677 }
 678
 679 static void
 680 text_entry_redraw_handler(struct widget *widget, void *data)
 681 {
 682         struct text_entry *entry = data;
 683         cairo_surface_t *surface;
 684         struct rectangle allocation;
 685         cairo_t *cr;
 686
 687         surface = window_get_surface(entry->window);
 688         widget_get_allocation(entry->widget, &allocation);
 689
 690         cr = cairo_create(surface);
 691         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 692         cairo_clip(cr);
 693
 694         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 695
 696         cairo_push_group(cr);
 697         cairo_translate(cr, allocation.x, allocation.y);
 698
 699         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 700         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 701         cairo_fill(cr);
 702
 703         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 704
 705         if (entry->active) {
 706                 cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 707                 cairo_set_line_width (cr, 3);
 708                 cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
 709                 cairo_stroke(cr);
 710         }
 711
 712         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 713
 714         cairo_translate(cr, 10, allocation.height / 2);
 715         text_layout_draw(entry->layout, cr);
 716
 717         text_entry_draw_selection(entry, cr);
 718
 719         text_entry_draw_cursor(entry, cr);
 720
 721         text_entry_draw_preedit(entry, cr);
 722
 723         cairo_pop_group_to_source(cr);
 724         cairo_paint(cr);
 725
 726         cairo_destroy(cr);
 727         cairo_surface_destroy(surface);
 728 }
 729
 730 static int
 731 text_entry_motion_handler(struct widget *widget,
 732                           struct input *input, uint32_t time,
 733                           float x, float y, void *data)
 734 {
 735         struct text_entry *entry = data;
 736         struct rectangle allocation;
 737
 738         widget_get_allocation(entry->widget, &allocation);
 739
 740         text_entry_set_cursor_position(entry,
 741                                        x - allocation.x,
 742                                        y - allocation.y);
 743
 744         return CURSOR_IBEAM;
 745 }
 746
 747 static void
 748 text_entry_button_handler(struct widget *widget,
 749                           struct input *input, uint32_t time,
 750                           uint32_t button,
 751                           enum wl_pointer_button_state state, void *data)
 752 {
 753         struct text_entry *entry = data;
 754         struct rectangle allocation;
 755         int32_t x, y;
 756
 757         widget_get_allocation(entry->widget, &allocation);
 758         input_get_position(input, &x, &y);
 759
 760         if (button != BTN_LEFT) {
 761                 return;
 762         }
 763
 764         text_entry_set_cursor_position(entry,
 765                                        x - allocation.x,
 766                                        y - allocation.y);
 767
 768         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 769                 struct wl_seat *seat = input_get_seat(input);
 770
 771                 text_entry_activate(entry, seat);
 772
 773                 text_entry_set_anchor_position(entry,
 774                                                x - allocation.x,
 775                                                y - allocation.y);
 776
 777                 widget_set_motion_handler(entry->widget, text_entry_motion_handler);
 778         } else {
 779                 widget_set_motion_handler(entry->widget, NULL);
 780         }
 781 }
 782
 783 static void
 784 editor_button_handler(struct widget *widget,
 785                       struct input *input, uint32_t time,
 786                       uint32_t button,
 787                       enum wl_pointer_button_state state, void *data)
 788 {
 789         struct editor *editor = data;
 790
 791         if (button != BTN_LEFT) {
 792                 return;
 793         }
 794
 795         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 796                 struct wl_seat *seat = input_get_seat(input);
 797
 798                 text_entry_deactivate(editor->entry, seat);
 799                 text_entry_deactivate(editor->editor, seat);
 800         }
 801 }
 802
 803 static void
 804 global_handler(struct wl_display *display, uint32_t id,
 805                const char *interface, uint32_t version, void *data)
 806 {
 807         struct editor *editor = data;
 808
 809         if (!strcmp(interface, "text_model_factory")) {
 810                 editor->text_model_factory = wl_display_bind(display, id,
 811                                                              &text_model_factory_interface);
 812         }
 813 }
 814
 815 int
 816 main(int argc, char *argv[])
 817 {
 818         struct editor editor;
 819
 820         editor.display = display_create(argc, argv);
 821         if (editor.display == NULL) {
 822                 fprintf(stderr, "failed to create display: %m\n");
 823                 return -1;
 824         }
 825         wl_display_add_global_listener(display_get_display(editor.display),
 826                                        global_handler, &editor);
 827
 828
 829         editor.window = window_create(editor.display);
 830         editor.widget = frame_create(editor.window, &editor);
 831
 832         editor.entry = text_entry_create(&editor, "Entry");
 833         editor.editor = text_entry_create(&editor, "Editor");
 834         text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
 835
 836         window_set_title(editor.window, "Text Editor");
 837
 838         widget_set_redraw_handler(editor.widget, redraw_handler);
 839         widget_set_resize_handler(editor.widget, resize_handler);
 840         widget_set_button_handler(editor.widget, editor_button_handler);
 841
 842         window_schedule_resize(editor.window, 500, 400);
 843
 844         display_run(editor.display);
 845
 846         text_entry_destroy(editor.entry);
 847         text_entry_destroy(editor.editor);
 848
 849         return 0;
 850 }