2 * Copyright © 2010 Kristian Høgsberg
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.
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
33 #include <gdk-pixbuf/gdk-pixbuf.h>
35 #include "wayland-client.h"
36 #include "wayland-glib.h"
41 struct window *window;
42 struct display *display;
44 struct item *items[16];
48 cairo_surface_t *translucent;
49 cairo_surface_t *opaque;
50 int hotspot_x, hotspot_y;
55 int x_offset, y_offset;
56 const char *mime_type;
62 struct wl_array types;
63 const char *drag_type;
69 cairo_surface_t *surface;
74 struct dnd_flower_message {
75 int seed, x_offset, y_offset;
79 static const int item_width = 64;
80 static const int item_height = 64;
81 static const int item_padding = 16;
84 item_create(struct display *display, int x, int y, int seed)
89 item = malloc(sizeof *item);
94 gettimeofday(&tv, NULL);
95 item->seed = seed ? seed : tv.tv_usec;
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;
106 double t, dt = 2 * M_PI / (petal_count * 2);
107 double x1, y1, x2, y2, x3, y3;
108 struct rectangle rect;
111 rect.width = item_width;
112 rect.height = item_height;
113 item->surface = display_create_surface(display, &rect);
118 cr = cairo_create(item->surface);
119 cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
120 cairo_set_source_rgba(cr, 0, 0, 0, 0);
123 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
124 cairo_translate(cr, item_width / 2, item_height / 2);
126 cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
127 for (i = 0; i < petal_count; i++, t += dt * 2) {
130 x2 = cos(t + dt) * r2;
131 y2 = sin(t + dt) * r2;
132 x3 = cos(t + 2 * dt) * r1;
133 y3 = sin(t + 2 * dt) * r1;
136 x1 - y1 * u, y1 + x1 * u,
137 x2 + y2 * v, y2 - x2 * v,
141 x2 - y2 * v, y2 + x2 * v,
142 x3 + y3 * u, y3 - x3 * u,
146 cairo_close_path(cr);
148 cairo_set_source_rgba(cr,
149 0.5 + (random() % 50) / 49.0,
150 0.5 + (random() % 50) / 49.0,
151 0.5 + (random() % 50) / 49.0,
152 0.5 + (random() % 100) / 99.0);
154 cairo_fill_preserve(cr);
156 cairo_set_line_width(cr, 1);
157 cairo_set_source_rgba(cr,
158 0.5 + (random() % 50) / 49.0,
159 0.5 + (random() % 50) / 49.0,
160 0.5 + (random() % 50) / 49.0,
161 0.5 + (random() % 100) / 99.0);
170 dnd_draw(struct dnd *dnd)
172 struct rectangle allocation;
174 cairo_surface_t *wsurface, *surface;
177 window_draw(dnd->window);
179 window_get_child_allocation(dnd->window, &allocation);
181 wsurface = window_get_surface(dnd->window);
182 surface = cairo_surface_create_similar(wsurface,
183 CAIRO_CONTENT_COLOR_ALPHA,
186 cairo_surface_destroy(wsurface);
188 cr = cairo_create(surface);
189 cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
190 cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
193 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
194 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
197 cairo_set_source_surface(cr, dnd->items[i]->surface,
198 dnd->items[i]->x, dnd->items[i]->y);
204 window_copy_surface(dnd->window, &allocation, surface);
205 cairo_surface_destroy(surface);
206 window_flush(dnd->window);
210 redraw_handler(struct window *window, void *data)
212 struct dnd *dnd = data;
218 keyboard_focus_handler(struct window *window,
219 struct input *device, void *data)
221 struct dnd *dnd = data;
223 window_schedule_redraw(dnd->window);
227 dnd_offer_destroy(struct dnd_offer *dnd_offer)
229 dnd_offer->refcount--;
230 if (dnd_offer->refcount == 0) {
231 wl_array_release(&dnd_offer->types);
237 dnd_add_item(struct dnd *dnd, struct item *item)
241 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
242 if (dnd->items[i] == 0) {
243 dnd->items[i] = item;
251 dnd_get_item(struct dnd *dnd, int32_t x, int32_t y)
254 struct rectangle allocation;
257 window_get_child_allocation(dnd->window, &allocation);
262 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
263 item = dnd->items[i];
265 item->x <= x && x < item->x + item_width &&
266 item->y <= y && y < item->y + item_height)
274 drag_target(void *data,
275 struct wl_drag *drag, const char *mime_type)
277 struct dnd_drag *dnd_drag = data;
278 struct dnd *dnd = dnd_drag->dnd;
279 struct wl_input_device *device;
280 cairo_surface_t *surface;
281 struct wl_buffer *buffer;
283 fprintf(stderr, "target %s\n", mime_type);
284 device = input_get_input_device(dnd_drag->input);
285 dnd_drag->mime_type = mime_type;
287 surface = dnd_drag->opaque;
289 surface = dnd_drag->translucent;
291 buffer = display_get_buffer_for_surface(dnd->display, surface);
292 wl_input_device_attach(device, dnd_drag->time, buffer,
293 dnd_drag->hotspot_x, dnd_drag->hotspot_y);
297 drag_finish(void *data, struct wl_drag *drag, int fd)
299 struct dnd_drag *dnd_drag = data;
301 if (!dnd_drag->mime_type) {
302 dnd_add_item(dnd_drag->dnd, dnd_drag->item);
303 window_schedule_redraw(dnd_drag->dnd->window);
307 struct dnd_flower_message dnd_flower_message;
310 dnd_flower_message.seed = dnd_drag->item->seed;
312 dnd_flower_message.x_offset = dnd_drag->x_offset;
313 dnd_flower_message.y_offset = dnd_drag->y_offset;
315 fprintf(stderr, "got 'finish', fd %d, sending dnd_flower_message\n", fd);
317 write(fd, &dnd_flower_message, sizeof dnd_flower_message);
320 /* The 'finish' event marks the end of the session on the drag
321 * source side and we need to clean up the drag object created
322 * and the local state. */
323 wl_drag_destroy(drag);
325 /* Destroy the item that has been dragged out */
326 cairo_surface_destroy(dnd_drag->item->surface);
327 free(dnd_drag->item);
329 cairo_surface_destroy(dnd_drag->translucent);
330 cairo_surface_destroy(dnd_drag->opaque);
335 drag_reject(void *data, struct wl_drag *drag)
337 struct dnd_drag *dnd_drag = data;
339 dnd_add_item(dnd_drag->dnd, dnd_drag->item);
340 window_schedule_redraw(dnd_drag->dnd->window);
343 static const struct wl_drag_listener drag_listener = {
350 drag_offer_offer(void *data,
351 struct wl_drag_offer *offer, const char *type)
353 struct dnd_offer *dnd_offer = data;
356 p = wl_array_add(&dnd_offer->types, sizeof *p);
362 drag_offer_pointer_focus(void *data,
363 struct wl_drag_offer *offer,
364 uint32_t time, struct wl_surface *surface,
365 int32_t x, int32_t y,
366 int32_t surface_x, int32_t surface_y)
368 struct dnd_offer *dnd_offer = data;
369 struct window *window;
372 /* The last event in a dnd session is pointer_focus with a
373 * NULL surface, whether or not we get the drop event. We
374 * need to clean up the dnd_offer proxy and whatever state we
377 fprintf(stderr, "pointer focus NULL, session over\n");
378 wl_drag_offer_destroy(offer);
379 dnd_offer_destroy(dnd_offer);
383 fprintf(stderr, "drag pointer focus %p\n", surface);
384 fprintf(stderr, "offered types:\n");
385 end = dnd_offer->types.data + dnd_offer->types.size;
386 for (p = dnd_offer->types.data; p < end; p++)
387 fprintf(stderr, "\%s\n", *p);
389 window = wl_surface_get_user_data(surface);
390 dnd_offer->dnd = window_get_user_data(window);
392 if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
393 wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
394 dnd_offer->drag_type = "application/x-wayland-dnd-flower";
395 dnd_offer->x = surface_x;
396 dnd_offer->y = surface_y;
398 wl_drag_offer_accept(offer, time, NULL);
399 dnd_offer->drag_type = NULL;
404 drag_offer_motion(void *data,
405 struct wl_drag_offer *offer, uint32_t time,
406 int32_t x, int32_t y, int32_t surface_x, int32_t surface_y)
408 struct dnd_offer *dnd_offer = data;
410 if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
411 fprintf(stderr, "drag offer motion %d, %d, accepting\n",
412 surface_x, surface_y);
413 wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
414 dnd_offer->drag_type = "application/x-wayland-dnd-flower";
415 dnd_offer->x = surface_x;
416 dnd_offer->y = surface_y;
418 fprintf(stderr, "drag offer motion %d, %d, declining\n",
419 surface_x, surface_y);
420 wl_drag_offer_accept(offer, time, NULL);
421 dnd_offer->drag_type = NULL;
426 drop_io_func(GIOChannel *source, GIOCondition condition, gpointer data)
428 struct dnd_offer *dnd_offer = data;
429 struct dnd *dnd = dnd_offer->dnd;
430 struct dnd_flower_message dnd_flower_message;
435 fd = g_io_channel_unix_get_fd(source);
436 len = read(fd, &dnd_flower_message, sizeof dnd_flower_message);
437 fprintf(stderr, "read %d bytes\n", len);
440 g_source_remove(dnd_offer->tag);
442 g_io_channel_unref(source);
444 item = item_create(dnd->display,
445 dnd_offer->x - dnd_flower_message.x_offset - 26,
446 dnd_offer->y - dnd_flower_message.y_offset - 66,
447 dnd_flower_message.seed);
449 dnd_add_item(dnd, item);
450 window_schedule_redraw(dnd->window);
452 dnd_offer_destroy(dnd_offer);
458 drag_offer_drop(void *data, struct wl_drag_offer *offer)
460 struct dnd_offer *dnd_offer = data;
464 if (!dnd_offer->drag_type) {
465 fprintf(stderr, "got 'drop', but no target\n");
466 wl_drag_offer_reject(offer);
470 fprintf(stderr, "got 'drop', sending write end of pipe\n");
472 dnd_offer->refcount++;
474 wl_drag_offer_receive(offer, p[1]);
477 channel = g_io_channel_unix_new(p[0]);
478 dnd_offer->tag = g_io_add_watch(channel, G_IO_IN,
479 drop_io_func, dnd_offer);
482 static const struct wl_drag_offer_listener drag_offer_listener = {
484 drag_offer_pointer_focus,
490 global_handler(struct display *display,
491 const char *interface, uint32_t id, uint32_t version)
493 struct wl_drag_offer *offer;
494 struct dnd_offer *dnd_offer;
496 if (strcmp(interface, "drag_offer") != 0)
499 offer = wl_drag_offer_create(display_get_display(display), id);
501 dnd_offer = malloc(sizeof *dnd_offer);
502 if (dnd_offer == NULL)
505 dnd_offer->refcount = 1;
507 wl_drag_offer_add_listener(offer, &drag_offer_listener, dnd_offer);
508 wl_array_init(&dnd_offer->types);
511 static cairo_surface_t *
512 create_drag_cursor(struct dnd_drag *dnd_drag,
513 struct item *item, int32_t x, int32_t y, double opacity)
515 struct dnd *dnd = dnd_drag->dnd;
516 cairo_surface_t *surface, *pointer;
517 int32_t pointer_width, pointer_height, hotspot_x, hotspot_y;
518 struct rectangle rectangle;
519 cairo_pattern_t *pattern;
522 pointer = display_get_pointer_surface(dnd->display,
529 rectangle.width = item_width + 2 * pointer_width;
530 rectangle.height = item_height + 2 * pointer_height;
531 surface = display_create_surface(dnd->display, &rectangle);
533 cr = cairo_create(surface);
534 cairo_translate(cr, pointer_width, pointer_height);
536 cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
537 cairo_set_source_rgba(cr, 0, 0, 0, 0);
540 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
541 cairo_set_source_surface(cr, item->surface, 0, 0);
542 pattern = cairo_pattern_create_rgba(0, 0, 0, opacity);
543 cairo_mask(cr, pattern);
544 cairo_pattern_destroy(pattern);
546 cairo_set_source_surface(cr, pointer,
547 x - item->x - hotspot_x,
548 y - item->y - hotspot_y);
549 cairo_surface_destroy(pointer);
551 /* FIXME: more cairo-gl brokeness */
552 display_flush_cairo_device(dnd->display);
555 dnd_drag->hotspot_x = pointer_width + x - item->x;
556 dnd_drag->hotspot_y = pointer_height + y - item->y;
562 dnd_button_handler(struct window *window,
563 struct input *input, uint32_t time,
564 int button, int state, void *data)
566 struct dnd *dnd = data;
569 struct rectangle allocation;
570 struct dnd_drag *dnd_drag;
571 struct wl_drag *drag;
574 window_get_child_allocation(dnd->window, &allocation);
575 input_get_position(input, &x, &y);
576 item = dnd_get_item(dnd, x, y);
580 if (item && state == 1) {
581 fprintf(stderr, "start drag, item %p\n", item);
583 dnd_drag = malloc(sizeof *dnd_drag);
585 dnd_drag->input = input;
586 dnd_drag->time = time;
587 dnd_drag->item = item;
588 dnd_drag->x_offset = x - item->x;
589 dnd_drag->y_offset = y - item->y;
591 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
592 if (item == dnd->items[i]){
599 create_drag_cursor(dnd_drag, item, x, y, 1);
600 dnd_drag->translucent =
601 create_drag_cursor(dnd_drag, item, x, y, 0.2);
603 drag = window_create_drag(window);
604 wl_drag_offer(drag, "application/x-wayland-dnd-flower");
605 window_activate_drag(drag, window, input, time);
606 wl_drag_add_listener(drag, &drag_listener, dnd_drag);
607 window_schedule_redraw(dnd->window);
612 dnd_motion_handler(struct window *window,
613 struct input *input, uint32_t time,
614 int32_t x, int32_t y,
615 int32_t sx, int32_t sy, void *data)
617 struct dnd *dnd = data;
620 item = dnd_get_item(dnd, sx, sy);
623 return POINTER_HAND1;
625 return POINTER_LEFT_PTR;
629 dnd_create(struct display *display)
634 int32_t width, height;
636 dnd = malloc(sizeof *dnd);
639 memset(dnd, 0, sizeof *dnd);
641 title = g_strdup_printf("Wayland Drag and Drop Demo");
643 dnd->window = window_create(display, title, 500, 400);
644 dnd->display = display;
647 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
648 x = (i % 4) * (item_width + item_padding) + item_padding;
649 y = (i / 4) * (item_height + item_padding) + item_padding;
650 if ((i ^ (i >> 2)) & 1)
651 dnd->items[i] = item_create(display, x, y, 0);
653 dnd->items[i] = NULL;
656 window_set_user_data(dnd->window, dnd);
657 window_set_redraw_handler(dnd->window, redraw_handler);
658 window_set_keyboard_focus_handler(dnd->window,
659 keyboard_focus_handler);
660 window_set_button_handler(dnd->window,
663 window_set_motion_handler(dnd->window,
666 width = 4 * (item_width + item_padding) + item_padding;
667 height = 4 * (item_height + item_padding) + item_padding;
668 window_set_child_size(dnd->window, width, height);
675 static const GOptionEntry option_entries[] = {
680 main(int argc, char *argv[])
685 d = display_create(&argc, &argv, option_entries);
687 fprintf(stderr, "failed to create display: %m\n");
691 display_set_global_handler(d, global_handler);
693 dnd = dnd_create (d);