clients/dnd.c

   1 /*
   2  * Copyright © 2010 Kristian Høgsberg
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <math.h>
  30 #include <sys/time.h>
  31 #include <cairo.h>
  32 #include <sys/epoll.h>
  33
  34 #include <wayland-client.h>
  35 #include <wayland-cursor.h>
  36
  37 #include "window.h"
  38 #include "../shared/cairo-util.h"
  39
  40 struct dnd_drag;
  41
  42 struct dnd {
  43         struct window *window;
  44         struct widget *widget;
  45         struct display *display;
  46         uint32_t key;
  47         struct item *items[16];
  48         int self_only;
  49         struct dnd_drag *current_drag;
  50 };
  51
  52 struct dnd_drag {
  53         cairo_surface_t *translucent;
  54         cairo_surface_t *opaque;
  55         int hotspot_x, hotspot_y;
  56         struct dnd *dnd;
  57         struct input *input;
  58         uint32_t time;
  59         struct item *item;
  60         int x_offset, y_offset;
  61         int width, height;
  62         const char *mime_type;
  63
  64         struct wl_surface *drag_surface;
  65         struct wl_data_source *data_source;
  66 };
  67
  68 struct item {
  69         cairo_surface_t *surface;
  70         int seed;
  71         int x, y;
  72 };
  73
  74 struct dnd_flower_message {
  75         int seed, x_offset, y_offset;
  76 };
  77
  78
  79 static const int item_width = 64;
  80 static const int item_height = 64;
  81 static const int item_padding = 16;
  82
  83 static struct item *
  84 item_create(struct display *display, int x, int y, int seed)
  85 {
  86         struct item *item;
  87         struct timeval tv;
  88
  89         item = malloc(sizeof *item);
  90         if (item == NULL)
  91                 return NULL;
  92
  93
  94         gettimeofday(&tv, NULL);
  95         item->seed = seed ? seed : tv.tv_usec;
  96         srandom(item->seed);
  97
  98         const int petal_count = 3 + random() % 5;
  99         const double r1 = 20 + random() % 10;
 100         const double r2 = 5 + random() % 12;
 101         const double u = (10 + random() % 90) / 100.0;
 102         const double v = (random() % 90) / 100.0;
 103
 104         cairo_t *cr;
 105         int i;
 106         double t, dt = 2 * M_PI / (petal_count * 2);
 107         double x1, y1, x2, y2, x3, y3;
 108         struct rectangle rect;
 109
 110
 111         rect.width = item_width;
 112         rect.height = item_height;
 113         item->surface =
 114                 display_create_surface(display, NULL, &rect, SURFACE_SHM);
 115
 116         item->x = x;
 117         item->y = y;
 118
 119         cr = cairo_create(item->surface);
 120         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 121         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 122         cairo_paint(cr);
 123
 124         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 125         cairo_translate(cr, item_width / 2, item_height / 2);
 126         t = random();
 127         cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
 128         for (i = 0; i < petal_count; i++, t += dt * 2) {
 129                 x1 = cos(t) * r1;
 130                 y1 = sin(t) * r1;
 131                 x2 = cos(t + dt) * r2;
 132                 y2 = sin(t + dt) * r2;
 133                 x3 = cos(t + 2 * dt) * r1;
 134                 y3 = sin(t + 2 * dt) * r1;
 135
 136                 cairo_curve_to(cr,
 137                                x1 - y1 * u, y1 + x1 * u,
 138                                x2 + y2 * v, y2 - x2 * v,
 139                                x2, y2);
 140
 141                 cairo_curve_to(cr,
 142                                x2 - y2 * v, y2 + x2 * v,
 143                                x3 + y3 * u, y3 - x3 * u,
 144                                x3, y3);
 145         }
 146
 147         cairo_close_path(cr);
 148
 149         cairo_set_source_rgba(cr,
 150                               0.5 + (random() % 50) / 49.0,
 151                               0.5 + (random() % 50) / 49.0,
 152                               0.5 + (random() % 50) / 49.0,
 153                               0.5 + (random() % 100) / 99.0);
 154
 155         cairo_fill_preserve(cr);
 156
 157         cairo_set_line_width(cr, 1);
 158         cairo_set_source_rgba(cr,
 159                               0.5 + (random() % 50) / 49.0,
 160                               0.5 + (random() % 50) / 49.0,
 161                               0.5 + (random() % 50) / 49.0,
 162                               0.5 + (random() % 100) / 99.0);
 163         cairo_stroke(cr);
 164
 165         cairo_destroy(cr);
 166
 167         return item;
 168 }
 169
 170 static void
 171 dnd_redraw_handler(struct widget *widget, void *data)
 172 {
 173         struct dnd *dnd = data;
 174         struct rectangle allocation;
 175         cairo_t *cr;
 176         cairo_surface_t *surface;
 177         unsigned int i;
 178
 179         surface = window_get_surface(dnd->window);
 180         cr = cairo_create(surface);
 181         widget_get_allocation(dnd->widget, &allocation);
 182         cairo_rectangle(cr, allocation.x, allocation.y,
 183                         allocation.width, allocation.height);
 184
 185         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 186         cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
 187         cairo_fill(cr);
 188
 189         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 190         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 191                 if (!dnd->items[i])
 192                         continue;
 193                 cairo_set_source_surface(cr, dnd->items[i]->surface,
 194                                          dnd->items[i]->x + allocation.x,
 195                                          dnd->items[i]->y + allocation.y);
 196                 cairo_paint(cr);
 197         }
 198
 199         cairo_destroy(cr);
 200         cairo_surface_destroy(surface);
 201 }
 202
 203 static void
 204 keyboard_focus_handler(struct window *window,
 205                        struct input *device, void *data)
 206 {
 207         struct dnd *dnd = data;
 208
 209         window_schedule_redraw(dnd->window);
 210 }
 211
 212 static int
 213 dnd_add_item(struct dnd *dnd, struct item *item)
 214 {
 215         unsigned int i;
 216
 217         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 218                 if (dnd->items[i] == 0) {
 219                         dnd->items[i] = item;
 220                         return i;
 221                 }
 222         }
 223         return -1;
 224 }
 225
 226 static struct item *
 227 dnd_get_item(struct dnd *dnd, int32_t x, int32_t y)
 228 {
 229         struct item *item;
 230         struct rectangle allocation;
 231         unsigned int i;
 232
 233         widget_get_allocation(dnd->widget, &allocation);
 234
 235         x -= allocation.x;
 236         y -= allocation.y;
 237
 238         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 239                 item = dnd->items[i];
 240                 if (item &&
 241                     item->x <= x && x < item->x + item_width &&
 242                     item->y <= y && y < item->y + item_height)
 243                         return item;
 244         }
 245
 246         return NULL;
 247 }
 248
 249 static void
 250 data_source_target(void *data,
 251                    struct wl_data_source *source, const char *mime_type)
 252 {
 253         struct dnd_drag *dnd_drag = data;
 254         struct dnd *dnd = dnd_drag->dnd;
 255         cairo_surface_t *surface;
 256         struct wl_buffer *buffer;
 257
 258         dnd_drag->mime_type = mime_type;
 259         if (mime_type)
 260                 surface = dnd_drag->opaque;
 261         else
 262                 surface = dnd_drag->translucent;
 263
 264         buffer = display_get_buffer_for_surface(dnd->display, surface);
 265         wl_surface_attach(dnd_drag->drag_surface, buffer, 0, 0);
 266         wl_surface_damage(dnd_drag->drag_surface, 0, 0,
 267                           dnd_drag->width, dnd_drag->height);
 268 }
 269
 270 static void
 271 data_source_send(void *data, struct wl_data_source *source,
 272                  const char *mime_type, int32_t fd)
 273 {
 274         struct dnd_flower_message dnd_flower_message;
 275         struct dnd_drag *dnd_drag = data;
 276
 277         dnd_flower_message.seed = dnd_drag->item->seed;
 278         dnd_flower_message.x_offset = dnd_drag->x_offset;
 279         dnd_flower_message.y_offset = dnd_drag->y_offset;
 280
 281         if (write(fd, &dnd_flower_message, sizeof dnd_flower_message) < 0)
 282                 abort();
 283
 284         close(fd);
 285 }
 286
 287 static void
 288 data_source_cancelled(void *data, struct wl_data_source *source)
 289 {
 290         struct dnd_drag *dnd_drag = data;
 291
 292         /* The 'cancelled' event means that the source is no longer in
 293          * use by the drag (or current selection).  We need to clean
 294          * up the drag object created and the local state. */
 295
 296         wl_data_source_destroy(dnd_drag->data_source);
 297
 298         /* Destroy the item that has been dragged out */
 299         cairo_surface_destroy(dnd_drag->item->surface);
 300         free(dnd_drag->item);
 301
 302         wl_surface_destroy(dnd_drag->drag_surface);
 303
 304         cairo_surface_destroy(dnd_drag->translucent);
 305         cairo_surface_destroy(dnd_drag->opaque);
 306         free(dnd_drag);
 307 }
 308
 309 static const struct wl_data_source_listener data_source_listener = {
 310         data_source_target,
 311         data_source_send,
 312         data_source_cancelled
 313 };
 314
 315 static cairo_surface_t *
 316 create_drag_cursor(struct dnd_drag *dnd_drag,
 317                    struct item *item, int32_t x, int32_t y, double opacity)
 318 {
 319         struct dnd *dnd = dnd_drag->dnd;
 320         cairo_surface_t *surface;
 321         struct wl_cursor_image *pointer;
 322         struct rectangle rectangle;
 323         cairo_pattern_t *pattern;
 324         cairo_t *cr;
 325
 326         pointer = display_get_pointer_image(dnd->display, CURSOR_DRAGGING);
 327
 328         rectangle.width = item_width + 2 * pointer->width;
 329         rectangle.height = item_height + 2 * pointer->height;
 330         surface = display_create_surface(dnd->display, NULL, &rectangle,
 331                                          SURFACE_SHM);
 332
 333         cr = cairo_create(surface);
 334         cairo_translate(cr, pointer->width, pointer->height);
 335
 336         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 337         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 338         cairo_paint(cr);
 339
 340         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 341         cairo_set_source_surface(cr, item->surface, 0, 0);
 342         pattern = cairo_pattern_create_rgba(0, 0, 0, opacity);
 343         cairo_mask(cr, pattern);
 344         cairo_pattern_destroy(pattern);
 345
 346         /* FIXME: more cairo-gl brokeness */
 347         surface_flush_device(surface);
 348         cairo_destroy(cr);
 349
 350         dnd_drag->hotspot_x = pointer->width + x - item->x;
 351         dnd_drag->hotspot_y = pointer->height + y - item->y;
 352         dnd_drag->width = rectangle.width;
 353         dnd_drag->height = rectangle.height;
 354
 355         return surface;
 356 }
 357
 358 static void
 359 dnd_button_handler(struct widget *widget,
 360                    struct input *input, uint32_t time,
 361                    uint32_t button, enum wl_pointer_button_state state,
 362                    void *data)
 363 {
 364         struct dnd *dnd = data;
 365         int32_t x, y;
 366         struct item *item;
 367         struct rectangle allocation;
 368         struct dnd_drag *dnd_drag;
 369         struct display *display;
 370         struct wl_compositor *compositor;
 371         struct wl_buffer *buffer;
 372         unsigned int i;
 373         uint32_t serial;
 374         cairo_surface_t *icon;
 375
 376         widget_get_allocation(dnd->widget, &allocation);
 377         input_get_position(input, &x, &y);
 378         item = dnd_get_item(dnd, x, y);
 379         x -= allocation.x;
 380         y -= allocation.y;
 381
 382         if (item && state == WL_POINTER_BUTTON_STATE_PRESSED) {
 383                 dnd_drag = malloc(sizeof *dnd_drag);
 384                 dnd_drag->dnd = dnd;
 385                 dnd_drag->input = input;
 386                 dnd_drag->time = time;
 387                 dnd_drag->item = item;
 388                 dnd_drag->x_offset = x - item->x;
 389                 dnd_drag->y_offset = y - item->y;
 390
 391                 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 392                         if (item == dnd->items[i]){
 393                                 dnd->items[i] = 0;
 394                                 break;
 395                         }
 396                 }
 397
 398                 display = window_get_display(dnd->window);
 399                 compositor = display_get_compositor(display);
 400                 serial = display_get_serial(display);
 401                 dnd_drag->drag_surface =
 402                         wl_compositor_create_surface(compositor);
 403
 404                 input_ungrab(input);
 405
 406                 if (dnd->self_only) {
 407                         dnd_drag->data_source = NULL;
 408                 } else {
 409                         dnd_drag->data_source =
 410                                 display_create_data_source(dnd->display);
 411                         wl_data_source_add_listener(dnd_drag->data_source,
 412                                                     &data_source_listener,
 413                                                     dnd_drag);
 414                         wl_data_source_offer(dnd_drag->data_source,
 415                                              "application/x-wayland-dnd-flower");
 416                         wl_data_source_offer(dnd_drag->data_source,
 417                                              "text/plain; charset=utf-8");
 418                 }
 419
 420                 wl_data_device_start_drag(input_get_data_device(input),
 421                                           dnd_drag->data_source,
 422                                           window_get_wl_surface(dnd->window),
 423                                           dnd_drag->drag_surface,
 424                                           serial);
 425
 426                 input_set_pointer_image(input, CURSOR_DRAGGING);
 427
 428                 dnd_drag->opaque =
 429                         create_drag_cursor(dnd_drag, item, x, y, 1);
 430                 dnd_drag->translucent =
 431                         create_drag_cursor(dnd_drag, item, x, y, 0.2);
 432
 433                 if (dnd->self_only)
 434                         icon = dnd_drag->opaque;
 435                 else
 436                         icon = dnd_drag->translucent;
 437
 438                 buffer = display_get_buffer_for_surface(dnd->display, icon);
 439                 wl_surface_attach(dnd_drag->drag_surface, buffer,
 440                                   -dnd_drag->hotspot_x, -dnd_drag->hotspot_y);
 441                 wl_surface_damage(dnd_drag->drag_surface, 0, 0,
 442                                   dnd_drag->width, dnd_drag->height);
 443
 444                 dnd->current_drag = dnd_drag;
 445                 window_schedule_redraw(dnd->window);
 446         }
 447 }
 448
 449 static int
 450 lookup_cursor(struct dnd *dnd, int x, int y)
 451 {
 452         struct item *item;
 453
 454         item = dnd_get_item(dnd, x, y);
 455         if (item)
 456                 return CURSOR_HAND1;
 457         else
 458                 return CURSOR_LEFT_PTR;
 459 }
 460
 461 static int
 462 dnd_enter_handler(struct widget *widget,
 463                   struct input *input, float x, float y, void *data)
 464 {
 465         struct dnd *dnd = data;
 466
 467         dnd->current_drag = NULL;
 468
 469         return lookup_cursor(dnd, x, y);
 470 }
 471
 472 static int
 473 dnd_motion_handler(struct widget *widget,
 474                    struct input *input, uint32_t time,
 475                    float x, float y, void *data)
 476 {
 477         return lookup_cursor(data, x, y);
 478 }
 479
 480 static void
 481 dnd_data_handler(struct window *window,
 482                  struct input *input,
 483                  float x, float y, const char **types, void *data)
 484 {
 485         struct dnd *dnd = data;
 486
 487         if (!types)
 488                 return;
 489
 490         if (dnd_get_item(dnd, x, y) || dnd->self_only) {
 491                 input_accept(input, NULL);
 492         } else {
 493                 input_accept(input, types[0]);
 494         }
 495 }
 496
 497 static void
 498 dnd_receive_func(void *data, size_t len, int32_t x, int32_t y, void *user_data)
 499 {
 500         struct dnd *dnd = user_data;
 501         struct dnd_flower_message *message = data;
 502         struct item *item;
 503         struct rectangle allocation;
 504
 505         if (len == 0) {
 506                 return;
 507         } else if (len != sizeof *message) {
 508                 fprintf(stderr, "odd message length %ld, expected %ld\n",
 509                         len, sizeof *message);
 510                 return;
 511         }
 512
 513         widget_get_allocation(dnd->widget, &allocation);
 514         item = item_create(dnd->display,
 515                            x - message->x_offset - allocation.x,
 516                            y - message->y_offset - allocation.y,
 517                            message->seed);
 518
 519         dnd_add_item(dnd, item);
 520         window_schedule_redraw(dnd->window);
 521 }
 522
 523 static void
 524 dnd_drop_handler(struct window *window, struct input *input,
 525                  int32_t x, int32_t y, void *data)
 526 {
 527         struct dnd *dnd = data;
 528         struct dnd_flower_message message;
 529
 530         if (dnd_get_item(dnd, x, y)) {
 531                 fprintf(stderr, "got 'drop', but no target\n");
 532                 return;
 533         }
 534
 535         if (!dnd->self_only) {
 536                 input_receive_drag_data(input,
 537                                         "application/x-wayland-dnd-flower",
 538                                         dnd_receive_func, dnd);
 539         } else if (dnd->current_drag) {
 540                 message.seed = dnd->current_drag->item->seed;
 541                 message.x_offset = dnd->current_drag->x_offset;
 542                 message.y_offset = dnd->current_drag->y_offset;
 543                 dnd_receive_func(&message, sizeof message, x, y, dnd);
 544                 dnd->current_drag = NULL;
 545         } else {
 546                 fprintf(stderr, "ignoring drop from another client\n");
 547         }
 548 }
 549
 550 static struct dnd *
 551 dnd_create(struct display *display)
 552 {
 553         struct dnd *dnd;
 554         int x, y;
 555         int32_t width, height;
 556         unsigned int i;
 557
 558         dnd = malloc(sizeof *dnd);
 559         if (dnd == NULL)
 560                 return dnd;
 561         memset(dnd, 0, sizeof *dnd);
 562
 563         dnd->window = window_create(display);
 564         dnd->widget = frame_create(dnd->window, dnd);
 565         window_set_title(dnd->window, "Wayland Drag and Drop Demo");
 566
 567         dnd->display = display;
 568         dnd->key = 100;
 569
 570         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 571                 x = (i % 4) * (item_width + item_padding) + item_padding;
 572                 y = (i / 4) * (item_height + item_padding) + item_padding;
 573                 if ((i ^ (i >> 2)) & 1)
 574                         dnd->items[i] = item_create(display, x, y, 0);
 575                 else
 576                         dnd->items[i] = NULL;
 577         }
 578
 579         window_set_user_data(dnd->window, dnd);
 580         window_set_keyboard_focus_handler(dnd->window,
 581                                           keyboard_focus_handler);
 582         window_set_data_handler(dnd->window, dnd_data_handler);
 583         window_set_drop_handler(dnd->window, dnd_drop_handler);
 584
 585         widget_set_redraw_handler(dnd->widget, dnd_redraw_handler);
 586         widget_set_enter_handler(dnd->widget, dnd_enter_handler);
 587         widget_set_motion_handler(dnd->widget, dnd_motion_handler);
 588         widget_set_button_handler(dnd->widget, dnd_button_handler);
 589
 590         width = 4 * (item_width + item_padding) + item_padding;
 591         height = 4 * (item_height + item_padding) + item_padding;
 592
 593         widget_schedule_resize(dnd->widget, width, height);
 594
 595         return dnd;
 596 }
 597
 598 int
 599 main(int argc, char *argv[])
 600 {
 601         struct display *d;
 602         struct dnd *dnd;
 603         int i;
 604
 605         d = display_create(argc, argv);
 606         if (d == NULL) {
 607                 fprintf(stderr, "failed to create display: %m\n");
 608                 return -1;
 609         }
 610
 611         dnd = dnd_create(d);
 612
 613         for (i = 1; i < argc; i++)
 614                 if (strcmp("--self-only", argv[i]) == 0)
 615                         dnd->self_only = 1;
 616
 617         display_run(d);
 618
 619         return 0;
 620 }