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 static void text_entry_delete_selected_text(struct text_entry *entry);
 218
 219 static void
 220 text_model_commit_string(void *data,
 221                          struct text_model *text_model,
 222                          const char *text,
 223                          uint32_t index)
 224 {
 225         struct text_entry *entry = data;
 226
 227         if (index > strlen(text)) {
 228                 fprintf(stderr, "Invalid cursor index %d\n", index);
 229                 index = strlen(text);
 230         }
 231
 232         text_entry_delete_selected_text(entry);
 233         text_entry_insert_at_cursor(entry, text);
 234
 235         widget_schedule_redraw(entry->widget);
 236 }
 237
 238 static void
 239 text_model_preedit_string(void *data,
 240                           struct text_model *text_model,
 241                           const char *text,
 242                           uint32_t index)
 243 {
 244         struct text_entry *entry = data;
 245
 246         if (index > strlen(text)) {
 247                 fprintf(stderr, "Invalid cursor index %d\n", index);
 248                 index = strlen(text);
 249         }
 250
 251         text_entry_delete_selected_text(entry);
 252         text_entry_set_preedit(entry, text, index);
 253
 254         widget_schedule_redraw(entry->widget);
 255 }
 256
 257 static void
 258 text_model_delete_surrounding_text(void *data,
 259                                    struct text_model *text_model,
 260                                    int32_t index,
 261                                    uint32_t length)
 262 {
 263         struct text_entry *entry = data;
 264         uint32_t cursor_index = index + entry->cursor;
 265
 266         if (cursor_index > strlen(entry->text)) {
 267                 fprintf(stderr, "Invalid cursor index %d\n", index);
 268                 return;
 269         }
 270
 271         if (cursor_index + length > strlen(entry->text)) {
 272                 fprintf(stderr, "Invalid length %d\n", length);
 273                 return;
 274         }
 275
 276         if (length == 0)
 277                 return;
 278
 279         text_entry_delete_text(entry, cursor_index, length);
 280 }
 281
 282 static void
 283 text_model_preedit_styling(void *data,
 284                            struct text_model *text_model)
 285 {
 286 }
 287
 288 static void
 289 text_model_key(void *data,
 290                struct text_model *text_model,
 291                uint32_t key,
 292                uint32_t state)
 293 {
 294         struct text_entry *entry = data;
 295         const char *state_label;
 296         const char *key_label = "released";
 297
 298         if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
 299                 state_label = "pressed";
 300         }
 301
 302         switch (key) {
 303                 case XKB_KEY_Tab:
 304                         key_label = "Tab";
 305                         break;
 306                 case XKB_KEY_KP_Enter:
 307                         key_label = "Enter";
 308                         break;
 309                 case XKB_KEY_Left:
 310                         if (entry->cursor > 0) {
 311                                 entry->cursor--;
 312                                 entry->anchor = entry->cursor;
 313                                 widget_schedule_redraw(entry->widget);
 314                         }
 315                         break;
 316                 case XKB_KEY_Right:
 317                         if (entry->cursor < strlen(entry->text)) {
 318                                 entry->cursor++;
 319                                 entry->anchor = entry->cursor;
 320                                 widget_schedule_redraw(entry->widget);
 321                         }
 322                         break;
 323                 default:
 324                         key_label = "Unknown";
 325         }
 326
 327         fprintf(stderr, "%s key was %s.\n", key_label, state_label);
 328 }
 329
 330 static void
 331 text_model_selection_replacement(void *data,
 332                                  struct text_model *text_model)
 333 {
 334 }
 335
 336 static void
 337 text_model_direction(void *data,
 338                      struct text_model *text_model)
 339 {
 340 }
 341
 342 static void
 343 text_model_locale(void *data,
 344                   struct text_model *text_model)
 345 {
 346 }
 347
 348 static void
 349 text_model_activated(void *data,
 350                      struct text_model *text_model)
 351 {
 352         struct text_entry *entry = data;
 353
 354         entry->active = 1;
 355
 356         widget_schedule_redraw(entry->widget);
 357 }
 358
 359 static void
 360 text_model_deactivated(void *data,
 361                        struct text_model *text_model)
 362 {
 363         struct text_entry *entry = data;
 364
 365         entry->active = 0;
 366
 367         widget_schedule_redraw(entry->widget);
 368 }
 369
 370 static const struct text_model_listener text_model_listener = {
 371         text_model_commit_string,
 372         text_model_preedit_string,
 373         text_model_delete_surrounding_text,
 374         text_model_preedit_styling,
 375         text_model_key,
 376         text_model_selection_replacement,
 377         text_model_direction,
 378         text_model_locale,
 379         text_model_activated,
 380         text_model_deactivated
 381 };
 382
 383 static struct text_entry*
 384 text_entry_create(struct editor *editor, const char *text)
 385 {
 386         struct text_entry *entry;
 387
 388         entry = malloc(sizeof *entry);
 389
 390         entry->widget = widget_add_widget(editor->widget, entry);
 391         entry->window = editor->window;
 392         entry->text = strdup(text);
 393         entry->active = 0;
 394         entry->cursor = strlen(text);
 395         entry->anchor = entry->cursor;
 396         entry->preedit_text = NULL;
 397         entry->preedit_cursor = 0;
 398         entry->model = text_model_factory_create_text_model(editor->text_model_factory);
 399         text_model_add_listener(entry->model, &text_model_listener, entry);
 400
 401         entry->layout = text_layout_create();
 402         text_layout_set_text(entry->layout, entry->text);
 403
 404         widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
 405         widget_set_button_handler(entry->widget, text_entry_button_handler);
 406
 407         return entry;
 408 }
 409
 410 static void
 411 text_entry_destroy(struct text_entry *entry)
 412 {
 413         widget_destroy(entry->widget);
 414         text_model_destroy(entry->model);
 415         text_layout_destroy(entry->layout);
 416         free(entry->text);
 417         free(entry);
 418 }
 419
 420 static void
 421 redraw_handler(struct widget *widget, void *data)
 422 {
 423         struct editor *editor = data;
 424         cairo_surface_t *surface;
 425         struct rectangle allocation;
 426         cairo_t *cr;
 427
 428         surface = window_get_surface(editor->window);
 429         widget_get_allocation(editor->widget, &allocation);
 430
 431         cr = cairo_create(surface);
 432         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 433         cairo_clip(cr);
 434
 435         cairo_translate(cr, allocation.x, allocation.y);
 436
 437         /* Draw background */
 438         cairo_push_group(cr);
 439         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 440         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 441         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 442         cairo_fill(cr);
 443
 444         cairo_pop_group_to_source(cr);
 445         cairo_paint(cr);
 446
 447         cairo_destroy(cr);
 448         cairo_surface_destroy(surface);
 449 }
 450
 451 static void
 452 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 453                     int32_t width, int32_t height)
 454 {
 455         widget_set_allocation(entry->widget, x, y, width, height);
 456 }
 457
 458 static void
 459 resize_handler(struct widget *widget,
 460                int32_t width, int32_t height, void *data)
 461 {
 462         struct editor *editor = data;
 463         struct rectangle allocation;
 464
 465         widget_get_allocation(editor->widget, &allocation);
 466
 467         text_entry_allocate(editor->entry,
 468                             allocation.x + 20, allocation.y + 20,
 469                             width - 40, height / 2 - 40);
 470         text_entry_allocate(editor->editor,
 471                             allocation.x + 20, allocation.y + height / 2 + 20,
 472                             width - 40, height / 2 - 40);
 473 }
 474
 475 static void
 476 text_entry_activate(struct text_entry *entry,
 477                     struct wl_seat *seat)
 478 {
 479         struct wl_surface *surface = window_get_wl_surface(entry->window);
 480
 481         text_model_activate(entry->model,
 482                             seat,
 483                             surface);
 484 }
 485
 486 static void
 487 text_entry_deactivate(struct text_entry *entry,
 488                       struct wl_seat *seat)
 489 {
 490         text_model_deactivate(entry->model,
 491                               seat);
 492 }
 493
 494 static void
 495 text_entry_update_layout(struct text_entry *entry)
 496 {
 497         char *text;
 498
 499         assert(((unsigned int)entry->cursor) <= strlen(entry->text));
 500
 501         if (!entry->preedit_text) {
 502                 text_layout_set_text(entry->layout, entry->text);
 503                 return;
 504         }
 505
 506         text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
 507         strncpy(text, entry->text, entry->cursor);
 508         strcpy(text + entry->cursor, entry->preedit_text);
 509         strcpy(text + entry->cursor + strlen(entry->preedit_text),
 510                entry->text + entry->cursor);
 511
 512         text_layout_set_text(entry->layout, text);
 513         free(text);
 514
 515         widget_schedule_redraw(entry->widget);
 516
 517         text_model_set_surrounding_text(entry->model,
 518                                         entry->text,
 519                                         entry->cursor,
 520                                         entry->anchor);
 521 }
 522
 523 static void
 524 text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
 525 {
 526         char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
 527
 528         strncpy(new_text, entry->text, entry->cursor);
 529         strcpy(new_text + entry->cursor, text);
 530         strcpy(new_text + entry->cursor + strlen(text),
 531                entry->text + entry->cursor);
 532
 533         free(entry->text);
 534         entry->text = new_text;
 535         entry->cursor += strlen(text);
 536         entry->anchor += strlen(text);
 537
 538         text_entry_update_layout(entry);
 539 }
 540
 541 static void
 542 text_entry_set_preedit(struct text_entry *entry,
 543                        const char *preedit_text,
 544                        int preedit_cursor)
 545 {
 546         if (entry->preedit_text) {
 547                 free(entry->preedit_text);
 548                 entry->preedit_text = NULL;
 549                 entry->preedit_cursor = 0;
 550         }
 551
 552         if (!preedit_text)
 553                 return;
 554
 555         entry->preedit_text = strdup(preedit_text);
 556         entry->preedit_cursor = preedit_cursor;
 557
 558         text_entry_update_layout(entry);
 559 }
 560
 561 static void
 562 text_entry_set_cursor_position(struct text_entry *entry,
 563                                int32_t x, int32_t y)
 564 {
 565         entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 566
 567         text_model_reset(entry->model);
 568
 569         if (entry->cursor >= entry->preedit_cursor) {
 570                 entry->cursor -= entry->preedit_cursor;
 571         }
 572
 573         text_entry_update_layout(entry);
 574
 575         widget_schedule_redraw(entry->widget);
 576 }
 577
 578 static void
 579 text_entry_set_anchor_position(struct text_entry *entry,
 580                                int32_t x, int32_t y)
 581 {
 582         entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
 583
 584         widget_schedule_redraw(entry->widget);
 585 }
 586
 587 static void
 588 text_entry_delete_text(struct text_entry *entry,
 589                        uint32_t index, uint32_t length)
 590 {
 591         if (entry->cursor > index)
 592                 entry->cursor -= length;
 593
 594         entry->anchor = entry->cursor;
 595
 596         entry->text[index] = '\0';
 597         strcat(entry->text, entry->text + index + length);
 598
 599         text_entry_update_layout(entry);
 600
 601         widget_schedule_redraw(entry->widget);
 602 }
 603
 604 static void
 605 text_entry_delete_selected_text(struct text_entry *entry)
 606 {
 607         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 608         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 609
 610         if (entry->anchor == entry->cursor)
 611                 return;
 612
 613         text_entry_delete_text(entry, start_index, end_index - start_index);
 614
 615         entry->anchor = entry->cursor;
 616 }
 617
 618 static void
 619 text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
 620 {
 621         cairo_text_extents_t extents;
 622         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 623         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 624         cairo_rectangle_t start;
 625         cairo_rectangle_t end;
 626
 627         if (entry->anchor == entry->cursor)
 628                 return;
 629
 630         text_layout_extents(entry->layout, &extents);
 631
 632         text_layout_index_to_pos(entry->layout, start_index, &start);
 633         text_layout_index_to_pos(entry->layout, end_index, &end);
 634
 635         cairo_save (cr);
 636
 637         cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
 638         cairo_rectangle(cr,
 639                         start.x, extents.y_bearing + extents.height + 2,
 640                         end.x - start.x, -extents.height - 4);
 641         cairo_fill(cr);
 642
 643         cairo_rectangle(cr,
 644                         start.x, extents.y_bearing + extents.height,
 645                         end.x - start.x, -extents.height);
 646         cairo_clip(cr);
 647         cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
 648         text_layout_draw(entry->layout, cr);
 649
 650         cairo_restore (cr);
 651 }
 652
 653 static void
 654 text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
 655 {
 656         cairo_text_extents_t extents;
 657         cairo_rectangle_t cursor_pos;
 658
 659         text_layout_extents(entry->layout, &extents);
 660         text_layout_get_cursor_pos(entry->layout,
 661                                    entry->cursor + entry->preedit_cursor,
 662                                    &cursor_pos);
 663
 664         cairo_set_line_width(cr, 1.0);
 665         cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
 666         cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
 667         cairo_stroke(cr);
 668 }
 669
 670 static void
 671 text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
 672 {
 673         cairo_text_extents_t extents;
 674         cairo_rectangle_t start;
 675         cairo_rectangle_t end;
 676
 677         if (!entry->preedit_text)
 678                 return;
 679
 680         text_layout_extents(entry->layout, &extents);
 681
 682         text_layout_index_to_pos(entry->layout, entry->cursor, &start);
 683         text_layout_index_to_pos(entry->layout,
 684                                  entry->cursor + strlen(entry->preedit_text),
 685                                  &end);
 686
 687         cairo_save (cr);
 688
 689         cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
 690         cairo_rectangle(cr,
 691                         start.x, 0,
 692                         end.x - start.x, 1);
 693         cairo_fill(cr);
 694
 695         cairo_restore (cr);
 696 }
 697
 698 static void
 699 text_entry_redraw_handler(struct widget *widget, void *data)
 700 {
 701         struct text_entry *entry = data;
 702         cairo_surface_t *surface;
 703         struct rectangle allocation;
 704         cairo_t *cr;
 705
 706         surface = window_get_surface(entry->window);
 707         widget_get_allocation(entry->widget, &allocation);
 708
 709         cr = cairo_create(surface);
 710         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 711         cairo_clip(cr);
 712
 713         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 714
 715         cairo_push_group(cr);
 716         cairo_translate(cr, allocation.x, allocation.y);
 717
 718         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 719         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 720         cairo_fill(cr);
 721
 722         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 723
 724         if (entry->active) {
 725                 cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 726                 cairo_set_line_width (cr, 3);
 727                 cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
 728                 cairo_stroke(cr);
 729         }
 730
 731         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 732
 733         cairo_translate(cr, 10, allocation.height / 2);
 734         text_layout_draw(entry->layout, cr);
 735
 736         text_entry_draw_selection(entry, cr);
 737
 738         text_entry_draw_cursor(entry, cr);
 739
 740         text_entry_draw_preedit(entry, cr);
 741
 742         cairo_pop_group_to_source(cr);
 743         cairo_paint(cr);
 744
 745         cairo_destroy(cr);
 746         cairo_surface_destroy(surface);
 747 }
 748
 749 static int
 750 text_entry_motion_handler(struct widget *widget,
 751                           struct input *input, uint32_t time,
 752                           float x, float y, void *data)
 753 {
 754         struct text_entry *entry = data;
 755         struct rectangle allocation;
 756
 757         widget_get_allocation(entry->widget, &allocation);
 758
 759         text_entry_set_cursor_position(entry,
 760                                        x - allocation.x,
 761                                        y - allocation.y);
 762
 763         return CURSOR_IBEAM;
 764 }
 765
 766 static void
 767 text_entry_button_handler(struct widget *widget,
 768                           struct input *input, uint32_t time,
 769                           uint32_t button,
 770                           enum wl_pointer_button_state state, void *data)
 771 {
 772         struct text_entry *entry = data;
 773         struct rectangle allocation;
 774         int32_t x, y;
 775
 776         widget_get_allocation(entry->widget, &allocation);
 777         input_get_position(input, &x, &y);
 778
 779         if (button != BTN_LEFT) {
 780                 return;
 781         }
 782
 783         text_entry_set_cursor_position(entry,
 784                                        x - allocation.x,
 785                                        y - allocation.y);
 786
 787         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 788                 struct wl_seat *seat = input_get_seat(input);
 789
 790                 text_entry_activate(entry, seat);
 791
 792                 text_entry_set_anchor_position(entry,
 793                                                x - allocation.x,
 794                                                y - allocation.y);
 795
 796                 widget_set_motion_handler(entry->widget, text_entry_motion_handler);
 797         } else {
 798                 widget_set_motion_handler(entry->widget, NULL);
 799         }
 800 }
 801
 802 static void
 803 editor_button_handler(struct widget *widget,
 804                       struct input *input, uint32_t time,
 805                       uint32_t button,
 806                       enum wl_pointer_button_state state, void *data)
 807 {
 808         struct editor *editor = data;
 809
 810         if (button != BTN_LEFT) {
 811                 return;
 812         }
 813
 814         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 815                 struct wl_seat *seat = input_get_seat(input);
 816
 817                 text_entry_deactivate(editor->entry, seat);
 818                 text_entry_deactivate(editor->editor, seat);
 819         }
 820 }
 821
 822 static void
 823 global_handler(struct wl_display *display, uint32_t id,
 824                const char *interface, uint32_t version, void *data)
 825 {
 826         struct editor *editor = data;
 827
 828         if (!strcmp(interface, "text_model_factory")) {
 829                 editor->text_model_factory = wl_display_bind(display, id,
 830                                                              &text_model_factory_interface);
 831         }
 832 }
 833
 834 int
 835 main(int argc, char *argv[])
 836 {
 837         struct editor editor;
 838
 839         editor.display = display_create(argc, argv);
 840         if (editor.display == NULL) {
 841                 fprintf(stderr, "failed to create display: %m\n");
 842                 return -1;
 843         }
 844         wl_display_add_global_listener(display_get_display(editor.display),
 845                                        global_handler, &editor);
 846
 847
 848         editor.window = window_create(editor.display);
 849         editor.widget = frame_create(editor.window, &editor);
 850
 851         editor.entry = text_entry_create(&editor, "Entry");
 852         editor.editor = text_entry_create(&editor, "Editor");
 853         text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
 854
 855         window_set_title(editor.window, "Text Editor");
 856
 857         widget_set_redraw_handler(editor.widget, redraw_handler);
 858         widget_set_resize_handler(editor.widget, resize_handler);
 859         widget_set_button_handler(editor.widget, editor_button_handler);
 860
 861         window_schedule_resize(editor.window, 500, 400);
 862
 863         display_run(editor.display);
 864
 865         text_entry_destroy(editor.entry);
 866         text_entry_destroy(editor.editor);
 867
 868         return 0;
 869 }