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         double d;
 157
 158         if (layout->num_glyphs == 0)
 159                 return 0;
 160
 161         cairo_scaled_font_glyph_extents(layout->font,
 162                                         layout->glyphs, layout->num_glyphs,
 163                                         &extents);
 164
 165         if (x < 0)
 166                 return 0;
 167
 168         for (i = 0; i < layout->num_glyphs - 1; ++i) {
 169                 d = layout->glyphs[i + 1].x - layout->glyphs[i].x;
 170                 if (x < layout->glyphs[i].x + d/2)
 171                         return i;
 172         }
 173
 174         d = extents.width - layout->glyphs[layout->num_glyphs - 1].x;
 175         if (x < layout->glyphs[layout->num_glyphs - 1].x + d/2)
 176                 return layout->num_glyphs - 1;
 177
 178         return layout->num_glyphs;
 179 }
 180
 181 static void
 182 text_layout_index_to_pos(struct text_layout *layout, uint32_t index, cairo_rectangle_t *pos)
 183 {
 184         cairo_text_extents_t extents;
 185
 186         if (!pos)
 187                 return;
 188
 189         cairo_scaled_font_glyph_extents(layout->font,
 190                                         layout->glyphs, layout->num_glyphs,
 191                                         &extents);
 192
 193         if ((int)index >= layout->num_glyphs) {
 194                 pos->x = extents.x_advance;
 195                 pos->y = layout->num_glyphs ? layout->glyphs[layout->num_glyphs - 1].y : 0;
 196                 pos->width = 1;
 197                 pos->height = extents.height;
 198                 return;
 199         }
 200
 201         pos->x = layout->glyphs[index].x;
 202         pos->y = layout->glyphs[index].y;
 203         pos->width = (int)index < layout->num_glyphs - 1 ? layout->glyphs[index + 1].x : extents.x_advance - pos->x;
 204         pos->height = extents.height;
 205 }
 206
 207 static void
 208 text_layout_get_cursor_pos(struct text_layout *layout, int index, cairo_rectangle_t *pos)
 209 {
 210         text_layout_index_to_pos(layout, index, pos);
 211         pos->width = 1;
 212 }
 213
 214 static void text_entry_redraw_handler(struct widget *widget, void *data);
 215 static void text_entry_button_handler(struct widget *widget,
 216                                       struct input *input, uint32_t time,
 217                                       uint32_t button,
 218                                       enum wl_pointer_button_state state, void *data);
 219 static void text_entry_insert_at_cursor(struct text_entry *entry, const char *text);
 220 static void text_entry_set_preedit(struct text_entry *entry,
 221                                    const char *preedit_text,
 222                                    int preedit_cursor);
 223 static void text_entry_delete_text(struct text_entry *entry,
 224                                    uint32_t index, uint32_t length);
 225 static void text_entry_delete_selected_text(struct text_entry *entry);
 226
 227 static void
 228 text_model_commit_string(void *data,
 229                          struct text_model *text_model,
 230                          const char *text,
 231                          uint32_t index)
 232 {
 233         struct text_entry *entry = data;
 234
 235         if (index > strlen(text)) {
 236                 fprintf(stderr, "Invalid cursor index %d\n", index);
 237                 index = strlen(text);
 238         }
 239
 240         text_entry_delete_selected_text(entry);
 241         text_entry_insert_at_cursor(entry, text);
 242
 243         widget_schedule_redraw(entry->widget);
 244 }
 245
 246 static void
 247 text_model_preedit_string(void *data,
 248                           struct text_model *text_model,
 249                           const char *text,
 250                           uint32_t index)
 251 {
 252         struct text_entry *entry = data;
 253
 254         if (index > strlen(text)) {
 255                 fprintf(stderr, "Invalid cursor index %d\n", index);
 256                 index = strlen(text);
 257         }
 258
 259         text_entry_delete_selected_text(entry);
 260         text_entry_set_preedit(entry, text, index);
 261
 262         widget_schedule_redraw(entry->widget);
 263 }
 264
 265 static void
 266 text_model_delete_surrounding_text(void *data,
 267                                    struct text_model *text_model,
 268                                    int32_t index,
 269                                    uint32_t length)
 270 {
 271         struct text_entry *entry = data;
 272         uint32_t cursor_index = index + entry->cursor;
 273
 274         if (cursor_index > strlen(entry->text)) {
 275                 fprintf(stderr, "Invalid cursor index %d\n", index);
 276                 return;
 277         }
 278
 279         if (cursor_index + length > strlen(entry->text)) {
 280                 fprintf(stderr, "Invalid length %d\n", length);
 281                 return;
 282         }
 283
 284         if (length == 0)
 285                 return;
 286
 287         text_entry_delete_text(entry, cursor_index, length);
 288 }
 289
 290 static void
 291 text_model_preedit_styling(void *data,
 292                            struct text_model *text_model)
 293 {
 294 }
 295
 296 static void
 297 text_model_key(void *data,
 298                struct text_model *text_model,
 299                uint32_t key,
 300                uint32_t state)
 301 {
 302         struct text_entry *entry = data;
 303         const char *state_label;
 304         const char *key_label = "released";
 305
 306         if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
 307                 state_label = "pressed";
 308         }
 309
 310         switch (key) {
 311                 case XKB_KEY_Tab:
 312                         key_label = "Tab";
 313                         break;
 314                 case XKB_KEY_KP_Enter:
 315                         key_label = "Enter";
 316                         break;
 317                 case XKB_KEY_Left:
 318                         if (entry->cursor > 0) {
 319                                 entry->cursor--;
 320                                 entry->anchor = entry->cursor;
 321                                 widget_schedule_redraw(entry->widget);
 322                         }
 323                         break;
 324                 case XKB_KEY_Right:
 325                         if (entry->cursor < strlen(entry->text)) {
 326                                 entry->cursor++;
 327                                 entry->anchor = entry->cursor;
 328                                 widget_schedule_redraw(entry->widget);
 329                         }
 330                         break;
 331                 default:
 332                         key_label = "Unknown";
 333         }
 334
 335         fprintf(stderr, "%s key was %s.\n", key_label, state_label);
 336 }
 337
 338 static void
 339 text_model_selection_replacement(void *data,
 340                                  struct text_model *text_model)
 341 {
 342 }
 343
 344 static void
 345 text_model_direction(void *data,
 346                      struct text_model *text_model)
 347 {
 348 }
 349
 350 static void
 351 text_model_locale(void *data,
 352                   struct text_model *text_model)
 353 {
 354 }
 355
 356 static void
 357 text_model_enter(void *data,
 358                  struct text_model *text_model,
 359                  struct wl_surface *surface)
 360 {
 361         struct text_entry *entry = data;
 362
 363         if (surface != window_get_wl_surface(entry->window))
 364                 return;
 365
 366         entry->active = 1;
 367
 368         widget_schedule_redraw(entry->widget);
 369 }
 370
 371 static void
 372 text_model_leave(void *data,
 373                  struct text_model *text_model)
 374 {
 375         struct text_entry *entry = data;
 376
 377         entry->active = 0;
 378
 379         widget_schedule_redraw(entry->widget);
 380 }
 381
 382 static const struct text_model_listener text_model_listener = {
 383         text_model_commit_string,
 384         text_model_preedit_string,
 385         text_model_delete_surrounding_text,
 386         text_model_preedit_styling,
 387         text_model_key,
 388         text_model_selection_replacement,
 389         text_model_direction,
 390         text_model_locale,
 391         text_model_enter,
 392         text_model_leave
 393 };
 394
 395 static struct text_entry*
 396 text_entry_create(struct editor *editor, const char *text)
 397 {
 398         struct text_entry *entry;
 399
 400         entry = malloc(sizeof *entry);
 401
 402         entry->widget = widget_add_widget(editor->widget, entry);
 403         entry->window = editor->window;
 404         entry->text = strdup(text);
 405         entry->active = 0;
 406         entry->cursor = strlen(text);
 407         entry->anchor = entry->cursor;
 408         entry->preedit_text = NULL;
 409         entry->preedit_cursor = 0;
 410         entry->model = text_model_factory_create_text_model(editor->text_model_factory);
 411         text_model_add_listener(entry->model, &text_model_listener, entry);
 412
 413         entry->layout = text_layout_create();
 414         text_layout_set_text(entry->layout, entry->text);
 415
 416         widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
 417         widget_set_button_handler(entry->widget, text_entry_button_handler);
 418
 419         return entry;
 420 }
 421
 422 static void
 423 text_entry_destroy(struct text_entry *entry)
 424 {
 425         widget_destroy(entry->widget);
 426         text_model_destroy(entry->model);
 427         text_layout_destroy(entry->layout);
 428         free(entry->text);
 429         free(entry);
 430 }
 431
 432 static void
 433 redraw_handler(struct widget *widget, void *data)
 434 {
 435         struct editor *editor = data;
 436         cairo_surface_t *surface;
 437         struct rectangle allocation;
 438         cairo_t *cr;
 439
 440         surface = window_get_surface(editor->window);
 441         widget_get_allocation(editor->widget, &allocation);
 442
 443         cr = cairo_create(surface);
 444         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 445         cairo_clip(cr);
 446
 447         cairo_translate(cr, allocation.x, allocation.y);
 448
 449         /* Draw background */
 450         cairo_push_group(cr);
 451         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 452         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 453         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 454         cairo_fill(cr);
 455
 456         cairo_pop_group_to_source(cr);
 457         cairo_paint(cr);
 458
 459         cairo_destroy(cr);
 460         cairo_surface_destroy(surface);
 461 }
 462
 463 static void
 464 text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
 465                     int32_t width, int32_t height)
 466 {
 467         widget_set_allocation(entry->widget, x, y, width, height);
 468 }
 469
 470 static void
 471 resize_handler(struct widget *widget,
 472                int32_t width, int32_t height, void *data)
 473 {
 474         struct editor *editor = data;
 475         struct rectangle allocation;
 476
 477         widget_get_allocation(editor->widget, &allocation);
 478
 479         text_entry_allocate(editor->entry,
 480                             allocation.x + 20, allocation.y + 20,
 481                             width - 40, height / 2 - 40);
 482         text_entry_allocate(editor->editor,
 483                             allocation.x + 20, allocation.y + height / 2 + 20,
 484                             width - 40, height / 2 - 40);
 485 }
 486
 487 static void
 488 text_entry_activate(struct text_entry *entry,
 489                     struct wl_seat *seat)
 490 {
 491         struct wl_surface *surface = window_get_wl_surface(entry->window);
 492
 493         text_model_activate(entry->model,
 494                             seat,
 495                             surface);
 496 }
 497
 498 static void
 499 text_entry_deactivate(struct text_entry *entry,
 500                       struct wl_seat *seat)
 501 {
 502         text_model_deactivate(entry->model,
 503                               seat);
 504 }
 505
 506 static void
 507 text_entry_update_layout(struct text_entry *entry)
 508 {
 509         char *text;
 510
 511         assert(((unsigned int)entry->cursor) <= strlen(entry->text) +
 512                (entry->preedit_text ? strlen(entry->preedit_text) : 0));
 513
 514         if (!entry->preedit_text) {
 515                 text_layout_set_text(entry->layout, entry->text);
 516                 return;
 517         }
 518
 519         text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
 520         strncpy(text, entry->text, entry->cursor);
 521         strcpy(text + entry->cursor, entry->preedit_text);
 522         strcpy(text + entry->cursor + strlen(entry->preedit_text),
 523                entry->text + entry->cursor);
 524
 525         text_layout_set_text(entry->layout, text);
 526         free(text);
 527
 528         widget_schedule_redraw(entry->widget);
 529
 530         text_model_set_surrounding_text(entry->model,
 531                                         entry->text,
 532                                         entry->cursor,
 533                                         entry->anchor);
 534 }
 535
 536 static void
 537 text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
 538 {
 539         char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
 540
 541         strncpy(new_text, entry->text, entry->cursor);
 542         strcpy(new_text + entry->cursor, text);
 543         strcpy(new_text + entry->cursor + strlen(text),
 544                entry->text + entry->cursor);
 545
 546         free(entry->text);
 547         entry->text = new_text;
 548         entry->cursor += strlen(text);
 549         entry->anchor += strlen(text);
 550
 551         text_entry_update_layout(entry);
 552 }
 553
 554 static void
 555 text_entry_set_preedit(struct text_entry *entry,
 556                        const char *preedit_text,
 557                        int preedit_cursor)
 558 {
 559         if (entry->preedit_text) {
 560                 free(entry->preedit_text);
 561                 entry->preedit_text = NULL;
 562                 entry->preedit_cursor = 0;
 563         }
 564
 565         if (!preedit_text)
 566                 return;
 567
 568         entry->preedit_text = strdup(preedit_text);
 569         entry->preedit_cursor = preedit_cursor;
 570
 571         text_entry_update_layout(entry);
 572 }
 573
 574 static void
 575 text_entry_set_cursor_position(struct text_entry *entry,
 576                                int32_t x, int32_t y)
 577 {
 578         entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 579
 580         text_model_reset(entry->model);
 581
 582         if (entry->cursor >= entry->preedit_cursor) {
 583                 entry->cursor -= entry->preedit_cursor;
 584         }
 585
 586         text_entry_update_layout(entry);
 587
 588         widget_schedule_redraw(entry->widget);
 589 }
 590
 591 static void
 592 text_entry_set_anchor_position(struct text_entry *entry,
 593                                int32_t x, int32_t y)
 594 {
 595         entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
 596
 597         widget_schedule_redraw(entry->widget);
 598 }
 599
 600 static void
 601 text_entry_delete_text(struct text_entry *entry,
 602                        uint32_t index, uint32_t length)
 603 {
 604         if (entry->cursor > index)
 605                 entry->cursor -= length;
 606
 607         entry->anchor = entry->cursor;
 608
 609         entry->text[index] = '\0';
 610         strcat(entry->text, entry->text + index + length);
 611
 612         text_entry_update_layout(entry);
 613
 614         widget_schedule_redraw(entry->widget);
 615 }
 616
 617 static void
 618 text_entry_delete_selected_text(struct text_entry *entry)
 619 {
 620         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 621         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 622
 623         if (entry->anchor == entry->cursor)
 624                 return;
 625
 626         text_entry_delete_text(entry, start_index, end_index - start_index);
 627
 628         entry->anchor = entry->cursor;
 629 }
 630
 631 static void
 632 text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
 633 {
 634         cairo_text_extents_t extents;
 635         uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
 636         uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
 637         cairo_rectangle_t start;
 638         cairo_rectangle_t end;
 639
 640         if (entry->anchor == entry->cursor)
 641                 return;
 642
 643         text_layout_extents(entry->layout, &extents);
 644
 645         text_layout_index_to_pos(entry->layout, start_index, &start);
 646         text_layout_index_to_pos(entry->layout, end_index, &end);
 647
 648         cairo_save (cr);
 649
 650         cairo_set_source_rgba(cr, 0.3, 0.3, 1.0, 0.5);
 651         cairo_rectangle(cr,
 652                         start.x, extents.y_bearing + extents.height + 2,
 653                         end.x - start.x, -extents.height - 4);
 654         cairo_fill(cr);
 655
 656         cairo_rectangle(cr,
 657                         start.x, extents.y_bearing + extents.height,
 658                         end.x - start.x, -extents.height);
 659         cairo_clip(cr);
 660         cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
 661         text_layout_draw(entry->layout, cr);
 662
 663         cairo_restore (cr);
 664 }
 665
 666 static void
 667 text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
 668 {
 669         cairo_text_extents_t extents;
 670         cairo_rectangle_t cursor_pos;
 671
 672         text_layout_extents(entry->layout, &extents);
 673         text_layout_get_cursor_pos(entry->layout,
 674                                    entry->cursor + entry->preedit_cursor,
 675                                    &cursor_pos);
 676
 677         cairo_set_line_width(cr, 1.0);
 678         cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
 679         cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
 680         cairo_stroke(cr);
 681 }
 682
 683 static void
 684 text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
 685 {
 686         cairo_text_extents_t extents;
 687         cairo_rectangle_t start;
 688         cairo_rectangle_t end;
 689
 690         if (!entry->preedit_text)
 691                 return;
 692
 693         text_layout_extents(entry->layout, &extents);
 694
 695         text_layout_index_to_pos(entry->layout, entry->cursor, &start);
 696         text_layout_index_to_pos(entry->layout,
 697                                  entry->cursor + strlen(entry->preedit_text),
 698                                  &end);
 699
 700         cairo_save (cr);
 701
 702         cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
 703         cairo_rectangle(cr,
 704                         start.x, 0,
 705                         end.x - start.x, 1);
 706         cairo_fill(cr);
 707
 708         cairo_restore (cr);
 709 }
 710
 711 static const int text_offset_left = 10;
 712
 713 static void
 714 text_entry_redraw_handler(struct widget *widget, void *data)
 715 {
 716         struct text_entry *entry = data;
 717         cairo_surface_t *surface;
 718         struct rectangle allocation;
 719         cairo_t *cr;
 720
 721         surface = window_get_surface(entry->window);
 722         widget_get_allocation(entry->widget, &allocation);
 723
 724         cr = cairo_create(surface);
 725         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 726         cairo_clip(cr);
 727
 728         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 729
 730         cairo_push_group(cr);
 731         cairo_translate(cr, allocation.x, allocation.y);
 732
 733         cairo_set_source_rgba(cr, 1, 1, 1, 1);
 734         cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 735         cairo_fill(cr);
 736
 737         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 738
 739         if (entry->active) {
 740                 cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
 741                 cairo_set_line_width (cr, 3);
 742                 cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
 743                 cairo_stroke(cr);
 744         }
 745
 746         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 747
 748         cairo_translate(cr, text_offset_left, allocation.height / 2);
 749         text_layout_draw(entry->layout, cr);
 750
 751         text_entry_draw_selection(entry, cr);
 752
 753         text_entry_draw_cursor(entry, cr);
 754
 755         text_entry_draw_preedit(entry, cr);
 756
 757         cairo_pop_group_to_source(cr);
 758         cairo_paint(cr);
 759
 760         cairo_destroy(cr);
 761         cairo_surface_destroy(surface);
 762 }
 763
 764 static int
 765 text_entry_motion_handler(struct widget *widget,
 766                           struct input *input, uint32_t time,
 767                           float x, float y, void *data)
 768 {
 769         struct text_entry *entry = data;
 770         struct rectangle allocation;
 771
 772         widget_get_allocation(entry->widget, &allocation);
 773
 774         text_entry_set_cursor_position(entry,
 775                                        x - allocation.x - text_offset_left,
 776                                        y - allocation.y - text_offset_left);
 777
 778         return CURSOR_IBEAM;
 779 }
 780
 781 static void
 782 text_entry_button_handler(struct widget *widget,
 783                           struct input *input, uint32_t time,
 784                           uint32_t button,
 785                           enum wl_pointer_button_state state, void *data)
 786 {
 787         struct text_entry *entry = data;
 788         struct rectangle allocation;
 789         int32_t x, y;
 790
 791         widget_get_allocation(entry->widget, &allocation);
 792         input_get_position(input, &x, &y);
 793
 794         if (button != BTN_LEFT) {
 795                 return;
 796         }
 797
 798         text_entry_set_cursor_position(entry,
 799                                        x - allocation.x - text_offset_left,
 800                                        y - allocation.y - text_offset_left);
 801
 802         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 803                 struct wl_seat *seat = input_get_seat(input);
 804
 805                 text_entry_activate(entry, seat);
 806
 807                 text_entry_set_anchor_position(entry,
 808                                                x - allocation.x - text_offset_left,
 809                                                y - allocation.y - text_offset_left);
 810
 811                 widget_set_motion_handler(entry->widget, text_entry_motion_handler);
 812         } else {
 813                 widget_set_motion_handler(entry->widget, NULL);
 814         }
 815 }
 816
 817 static void
 818 editor_button_handler(struct widget *widget,
 819                       struct input *input, uint32_t time,
 820                       uint32_t button,
 821                       enum wl_pointer_button_state state, void *data)
 822 {
 823         struct editor *editor = data;
 824
 825         if (button != BTN_LEFT) {
 826                 return;
 827         }
 828
 829         if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
 830                 struct wl_seat *seat = input_get_seat(input);
 831
 832                 text_entry_deactivate(editor->entry, seat);
 833                 text_entry_deactivate(editor->editor, seat);
 834         }
 835 }
 836
 837 static void
 838 global_handler(struct display *display, uint32_t name,
 839                const char *interface, uint32_t version, void *data)
 840 {
 841         struct editor *editor = data;
 842
 843         if (!strcmp(interface, "text_model_factory")) {
 844                 editor->text_model_factory =
 845                         display_bind(display, name,
 846                                      &text_model_factory_interface, 1);
 847         }
 848 }
 849
 850 int
 851 main(int argc, char *argv[])
 852 {
 853         struct editor editor;
 854
 855         editor.display = display_create(argc, argv);
 856         if (editor.display == NULL) {
 857                 fprintf(stderr, "failed to create display: %m\n");
 858                 return -1;
 859         }
 860
 861         display_set_user_data(editor.display, &editor);
 862         display_set_global_handler(editor.display, global_handler);
 863
 864         editor.window = window_create(editor.display);
 865         editor.widget = frame_create(editor.window, &editor);
 866
 867         editor.entry = text_entry_create(&editor, "Entry");
 868         editor.editor = text_entry_create(&editor, "Editor");
 869         text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
 870
 871         window_set_title(editor.window, "Text Editor");
 872
 873         widget_set_redraw_handler(editor.widget, redraw_handler);
 874         widget_set_resize_handler(editor.widget, resize_handler);
 875         widget_set_button_handler(editor.widget, editor_button_handler);
 876
 877         window_schedule_resize(editor.window, 500, 400);
 878
 879         display_run(editor.display);
 880
 881         text_entry_destroy(editor.entry);
 882         text_entry_destroy(editor.editor);
 883
 884         return 0;
 885 }