aboutsummaryrefslogtreecommitdiff
path: root/xwayland/selection/dnd.c
blob: ee9a23a662ba65f4386c12445eb1c5fe1c5275ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wlr/types/wlr_data_device.h>
#include <wlr/types/wlr_gtk_primary_selection.h>
#include <wlr/util/log.h>
#include <xcb/xfixes.h>
#include "xwayland/xwm.h"
#include "xwayland/selection.h"

static xcb_atom_t data_device_manager_dnd_action_to_atom(
		struct wlr_xwm *xwm, enum wl_data_device_manager_dnd_action action) {
	if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY) {
		return xwm->atoms[DND_ACTION_COPY];
	} else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE) {
		return xwm->atoms[DND_ACTION_MOVE];
	} else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK) {
		return xwm->atoms[DND_ACTION_ASK];
	}
	return XCB_ATOM_NONE;
}

static enum wl_data_device_manager_dnd_action
		data_device_manager_dnd_action_from_atom(struct wlr_xwm *xwm,
		enum atom_name atom) {
	if (atom == xwm->atoms[DND_ACTION_COPY] ||
			atom == xwm->atoms[DND_ACTION_PRIVATE]) {
		return WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
	} else if (atom == xwm->atoms[DND_ACTION_MOVE]) {
		return WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
	} else if (atom == xwm->atoms[DND_ACTION_ASK]) {
		return WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
	}
	return WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
}

static void xwm_dnd_send_event(struct wlr_xwm *xwm, xcb_atom_t type,
		xcb_client_message_data_t *data) {
	struct wlr_xwayland_surface *dest = xwm->drag_focus;
	assert(dest != NULL);

	xcb_client_message_event_t event = {
		.response_type = XCB_CLIENT_MESSAGE,
		.format = 32,
		.sequence = 0,
		.window = dest->window_id,
		.type = type,
		.data = *data,
	};

	xcb_send_event(xwm->xcb_conn,
		0, // propagate
		dest->window_id,
		XCB_EVENT_MASK_NO_EVENT,
		(const char *)&event);
	xcb_flush(xwm->xcb_conn);
}

static void xwm_dnd_send_enter(struct wlr_xwm *xwm) {
	struct wlr_drag *drag = xwm->drag;
	assert(drag != NULL);
	struct wl_array *mime_types = &drag->source->mime_types;

	xcb_client_message_data_t data = { 0 };
	data.data32[0] = xwm->dnd_selection.window;
	data.data32[1] = XDND_VERSION << 24;

	// If we have 3 MIME types or less, we can send them directly in the
	// DND_ENTER message
	size_t n = mime_types->size / sizeof(char *);
	if (n <= 3) {
		size_t i = 0;
		char **mime_type_ptr;
		wl_array_for_each(mime_type_ptr, mime_types) {
			char *mime_type = *mime_type_ptr;
			data.data32[2+i] = xwm_mime_type_to_atom(xwm, mime_type);
			++i;
		}
	} else {
		// Let the client know that targets are not contained in the message
		// data and must be retrieved with the DND_TYPE_LIST property
		data.data32[1] |= 1;

		xcb_atom_t targets[n];
		size_t i = 0;
		char **mime_type_ptr;
		wl_array_for_each(mime_type_ptr, mime_types) {
			char *mime_type = *mime_type_ptr;
			targets[i] = xwm_mime_type_to_atom(xwm, mime_type);
			++i;
		}

		xcb_change_property(xwm->xcb_conn,
			XCB_PROP_MODE_REPLACE,
			xwm->dnd_selection.window,
			xwm->atoms[DND_TYPE_LIST],
			XCB_ATOM_ATOM,
			32, // format
			n, targets);
	}

	xwm_dnd_send_event(xwm, xwm->atoms[DND_ENTER], &data);
}

static void xwm_dnd_send_position(struct wlr_xwm *xwm, uint32_t time, int16_t x,
		int16_t y) {
	struct wlr_drag *drag = xwm->drag;
	assert(drag != NULL);

	xcb_client_message_data_t data = { 0 };
	data.data32[0] = xwm->dnd_selection.window;
	data.data32[2] = (x << 16) | y;
	data.data32[3] = time;
	data.data32[4] =
		data_device_manager_dnd_action_to_atom(xwm, drag->source->actions);

	xwm_dnd_send_event(xwm, xwm->atoms[DND_POSITION], &data);
}

static void xwm_dnd_send_drop(struct wlr_xwm *xwm, uint32_t time) {
	struct wlr_drag *drag = xwm->drag;
	assert(drag != NULL);
	struct wlr_xwayland_surface *dest = xwm->drag_focus;
	assert(dest != NULL);

	xcb_client_message_data_t data = { 0 };
	data.data32[0] = xwm->dnd_selection.window;
	data.data32[2] = time;

	xwm_dnd_send_event(xwm, xwm->atoms[DND_DROP], &data);
}

static void xwm_dnd_send_leave(struct wlr_xwm *xwm) {
	struct wlr_drag *drag = xwm->drag;
	assert(drag != NULL);
	struct wlr_xwayland_surface *dest = xwm->drag_focus;
	assert(dest != NULL);

	xcb_client_message_data_t data = { 0 };
	data.data32[0] = xwm->dnd_selection.window;

	xwm_dnd_send_event(xwm, xwm->atoms[DND_LEAVE], &data);
}

/*static void xwm_dnd_send_finished(struct wlr_xwm *xwm) {
	struct wlr_drag *drag = xwm->drag;
	assert(drag != NULL);
	struct wlr_xwayland_surface *dest = xwm->drag_focus;
	assert(dest != NULL);

	xcb_client_message_data_t data = { 0 };
	data.data32[0] = xwm->dnd_selection.window;
	data.data32[1] = drag->source->accepted;

	if (drag->source->accepted) {
		data.data32[2] = data_device_manager_dnd_action_to_atom(xwm,
			drag->source->current_dnd_action);
	}

	xwm_dnd_send_event(xwm, xwm->atoms[DND_FINISHED], &data);
}*/

int xwm_handle_selection_client_message(struct wlr_xwm *xwm,
		xcb_client_message_event_t *ev) {
	if (ev->type == xwm->atoms[DND_STATUS]) {
		if (xwm->drag == NULL) {
			wlr_log(WLR_DEBUG, "ignoring XdndStatus client message because "
				"there's no drag");
			return 1;
		}

		xcb_client_message_data_t *data = &ev->data;
		xcb_window_t target_window = data->data32[0];
		bool accepted = data->data32[1] & 1;
		xcb_atom_t action_atom = data->data32[4];

		if (xwm->drag_focus == NULL ||
				target_window != xwm->drag_focus->window_id) {
			wlr_log(WLR_DEBUG, "ignoring XdndStatus client message because "
				"it doesn't match the current drag focus window ID");
			return 1;
		}

		enum wl_data_device_manager_dnd_action action =
			data_device_manager_dnd_action_from_atom(xwm, action_atom);

		struct wlr_drag *drag = xwm->drag;
		assert(drag != NULL);

		drag->source->accepted = accepted;
		wlr_data_source_dnd_action(drag->source, action);

		wlr_log(WLR_DEBUG, "DND_STATUS window=%" PRIu32 " accepted=%d action=%d",
			target_window, accepted, action);
		return 1;
	} else if (ev->type == xwm->atoms[DND_FINISHED]) {
		// This should only happen after the drag has ended, but before the drag
		// source is destroyed
		if (xwm->seat == NULL || xwm->seat->drag_source == NULL ||
				xwm->drag != NULL) {
			wlr_log(WLR_DEBUG, "ignoring XdndFinished client message because "
				"there's no finished drag");
			return 1;
		}

		struct wlr_data_source *source = xwm->seat->drag_source;

		xcb_client_message_data_t *data = &ev->data;
		xcb_window_t target_window = data->data32[0];
		bool performed = data->data32[1] & 1;
		xcb_atom_t action_atom = data->data32[2];

		if (xwm->drag_focus == NULL ||
				target_window != xwm->drag_focus->window_id) {
			wlr_log(WLR_DEBUG, "ignoring XdndFinished client message because "
				"it doesn't match the finished drag focus window ID");
			return 1;
		}

		enum wl_data_device_manager_dnd_action action =
			data_device_manager_dnd_action_from_atom(xwm, action_atom);

		if (performed) {
			wlr_data_source_dnd_finish(source);
		}

		wlr_log(WLR_DEBUG, "DND_FINISH window=%" PRIu32 " performed=%d action=%d",
			target_window, performed, action);
		return 1;
	} else {
		return 0;
	}
}

static void seat_handle_drag_focus(struct wl_listener *listener, void *data) {
	struct wlr_drag *drag = data;
	struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_focus);

	struct wlr_xwayland_surface *focus = NULL;
	if (drag->focus != NULL) {
		// TODO: check for subsurfaces?
		struct wlr_xwayland_surface *surface;
		wl_list_for_each(surface, &xwm->surfaces, link) {
			if (surface->surface == drag->focus) {
				focus = surface;
				break;
			}
		}
	}

	if (focus == xwm->drag_focus) {
		return;
	}

	if (xwm->drag_focus != NULL) {
		wlr_data_source_dnd_action(drag->source,
			WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE);
		xwm_dnd_send_leave(xwm);
	}

	xwm->drag_focus = focus;

	if (xwm->drag_focus != NULL) {
		xwm_dnd_send_enter(xwm);
	}
}

static void seat_handle_drag_motion(struct wl_listener *listener, void *data) {
	struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_motion);
	struct wlr_drag_motion_event *event = data;
	struct wlr_xwayland_surface *surface = xwm->drag_focus;

	if (surface == NULL) {
		return; // No xwayland surface focused
	}

	xwm_dnd_send_position(xwm, event->time, surface->x + (int16_t)event->sx,
		surface->y + (int16_t)event->sy);
}

static void seat_handle_drag_drop(struct wl_listener *listener, void *data) {
	struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_drop);
	struct wlr_drag_drop_event *event = data;

	if (xwm->drag_focus == NULL) {
		return; // No xwayland surface focused
	}

	wlr_log(WLR_DEBUG, "Wayland drag dropped over an Xwayland window");
	xwm_dnd_send_drop(xwm, event->time);
}

static void seat_handle_drag_destroy(struct wl_listener *listener, void *data) {
	struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_destroy);

	// Don't reset drag focus yet because the target will read the drag source
	// right after
	if (xwm->drag_focus != NULL && !xwm->drag->source->accepted) {
		wlr_log(WLR_DEBUG, "Wayland drag cancelled over an Xwayland window");
		xwm_dnd_send_leave(xwm);
	}

	wl_list_remove(&xwm->seat_drag_focus.link);
	wl_list_remove(&xwm->seat_drag_motion.link);
	wl_list_remove(&xwm->seat_drag_drop.link);
	wl_list_remove(&xwm->seat_drag_destroy.link);
	xwm->drag = NULL;
}

static void seat_handle_drag_source_destroy(struct wl_listener *listener,
		void *data) {
	struct wlr_xwm *xwm =
		wl_container_of(listener, xwm, seat_drag_source_destroy);

	wl_list_remove(&xwm->seat_drag_source_destroy.link);
	xwm->drag_focus = NULL;
}

void xwm_seat_handle_start_drag(struct wlr_xwm *xwm, struct wlr_drag *drag) {
	xwm->drag = drag;
	xwm->drag_focus = NULL;

	if (drag != NULL) {
		wl_signal_add(&drag->events.focus, &xwm->seat_drag_focus);
		xwm->seat_drag_focus.notify = seat_handle_drag_focus;
		wl_signal_add(&drag->events.motion, &xwm->seat_drag_motion);
		xwm->seat_drag_motion.notify = seat_handle_drag_motion;
		wl_signal_add(&drag->events.drop, &xwm->seat_drag_drop);
		xwm->seat_drag_drop.notify = seat_handle_drag_drop;
		wl_signal_add(&drag->events.destroy, &xwm->seat_drag_destroy);
		xwm->seat_drag_destroy.notify = seat_handle_drag_destroy;

		wl_signal_add(&drag->source->events.destroy,
			&xwm->seat_drag_source_destroy);
		xwm->seat_drag_source_destroy.notify = seat_handle_drag_source_destroy;
	}
}