i3
click.c
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1 #undef I3__FILE__
2 #define I3__FILE__ "click.c"
3 /*
4  * vim:ts=4:sw=4:expandtab
5  *
6  * i3 - an improved dynamic tiling window manager
7  * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
8  *
9  * click.c: Button press (mouse click) events.
10  *
11  */
12 #include "all.h"
13 
14 #include <time.h>
15 #include <math.h>
16 
17 #include <xcb/xcb_atom.h>
18 #include <xcb/xcb_icccm.h>
19 
20 #include <X11/XKBlib.h>
21 
23 
24 /*
25  * Finds the correct pair of first/second cons between the resize will take
26  * place according to the passed border position (top, left, right, bottom),
27  * then calls resize_graphical_handler().
28  *
29  */
30 static bool tiling_resize_for_border(Con *con, border_t border, xcb_button_press_event_t *event) {
31  DLOG("border = %d, con = %p\n", border, con);
32  char way = (border == BORDER_TOP || border == BORDER_LEFT ? 'p' : 'n');
33  orientation_t orientation = (border == BORDER_TOP || border == BORDER_BOTTOM ? VERT : HORIZ);
34 
35  /* look for a parent container with the right orientation */
36  Con *first = NULL, *second = NULL;
37  Con *resize_con = con;
38  while (resize_con->type != CT_WORKSPACE &&
39  resize_con->type != CT_FLOATING_CON &&
40  con_orientation(resize_con->parent) != orientation)
41  resize_con = resize_con->parent;
42 
43  DLOG("resize_con = %p\n", resize_con);
44  if (resize_con->type != CT_WORKSPACE &&
45  resize_con->type != CT_FLOATING_CON &&
46  con_orientation(resize_con->parent) == orientation) {
47  first = resize_con;
48  second = (way == 'n') ? TAILQ_NEXT(first, nodes) : TAILQ_PREV(first, nodes_head, nodes);
49  if (second == TAILQ_END(&(first->nodes_head))) {
50  second = NULL;
51  }
52  else if (way == 'p') {
53  Con *tmp = first;
54  first = second;
55  second = tmp;
56  }
57  DLOG("first = %p, second = %p, resize_con = %p\n",
58  first, second, resize_con);
59  }
60 
61  if (first == NULL || second == NULL) {
62  DLOG("Resize not possible\n");
63  return false;
64  }
65 
66  assert(first != second);
67  assert(first->parent == second->parent);
68 
69  /* We modify the X/Y position in the event so that the divider line is at
70  * the actual position of the border, not at the position of the click. */
71  if (orientation == HORIZ)
72  event->root_x = second->rect.x;
73  else event->root_y = second->rect.y;
74 
75  resize_graphical_handler(first, second, orientation, event);
76 
77  DLOG("After resize handler, rendering\n");
78  tree_render();
79  return true;
80 }
81 
82 /*
83  * Called when the user clicks using the floating_modifier, but the client is in
84  * tiling layout.
85  *
86  * Returns false if it does not do anything (that is, the click should be sent
87  * to the client).
88  *
89  */
90 static bool floating_mod_on_tiled_client(Con *con, xcb_button_press_event_t *event) {
91  /* The client is in tiling layout. We can still initiate a resize with the
92  * right mouse button, by chosing the border which is the most near one to
93  * the position of the mouse pointer */
94  int to_right = con->rect.width - event->event_x,
95  to_left = event->event_x,
96  to_top = event->event_y,
97  to_bottom = con->rect.height - event->event_y;
98 
99  DLOG("click was %d px to the right, %d px to the left, %d px to top, %d px to bottom\n",
100  to_right, to_left, to_top, to_bottom);
101 
102  if (to_right < to_left &&
103  to_right < to_top &&
104  to_right < to_bottom)
105  return tiling_resize_for_border(con, BORDER_RIGHT, event);
106 
107  if (to_left < to_right &&
108  to_left < to_top &&
109  to_left < to_bottom)
110  return tiling_resize_for_border(con, BORDER_LEFT, event);
111 
112  if (to_top < to_right &&
113  to_top < to_left &&
114  to_top < to_bottom)
115  return tiling_resize_for_border(con, BORDER_TOP, event);
116 
117  if (to_bottom < to_right &&
118  to_bottom < to_left &&
119  to_bottom < to_top)
120  return tiling_resize_for_border(con, BORDER_BOTTOM, event);
121 
122  return false;
123 }
124 
125 /*
126  * Finds out which border was clicked on and calls tiling_resize_for_border().
127  *
128  */
129 static bool tiling_resize(Con *con, xcb_button_press_event_t *event, const click_destination_t dest) {
130  /* check if this was a click on the window border (and on which one) */
131  Rect bsr = con_border_style_rect(con);
132  DLOG("BORDER x = %d, y = %d for con %p, window 0x%08x\n",
133  event->event_x, event->event_y, con, event->event);
134  DLOG("checks for right >= %d\n", con->window_rect.x + con->window_rect.width);
135  if (dest == CLICK_DECORATION) {
136  /* The user clicked on a window decoration. We ignore the following case:
137  * The container is a h-split, tabbed or stacked container with > 1
138  * window. Decorations will end up next to each other and the user
139  * expects to switch to a window by clicking on its decoration. */
140 
141  /* Since the container might either be the child *or* already a split
142  * container (in the case of a nested split container), we need to make
143  * sure that we are dealing with the split container here. */
144  Con *check_con = con;
145  if (con_is_leaf(check_con) && check_con->parent->type == CT_CON)
146  check_con = check_con->parent;
147 
148  if ((check_con->layout == L_STACKED ||
149  check_con->layout == L_TABBED ||
150  con_orientation(check_con) == HORIZ) &&
151  con_num_children(check_con) > 1) {
152  DLOG("Not handling this resize, this container has > 1 child.\n");
153  return false;
154  }
155  return tiling_resize_for_border(con, BORDER_TOP, event);
156  }
157 
158  if (event->event_x >= 0 && event->event_x <= bsr.x &&
159  event->event_y >= bsr.y && event->event_y <= con->rect.height + bsr.height)
160  return tiling_resize_for_border(con, BORDER_LEFT, event);
161 
162  if (event->event_x >= (con->window_rect.x + con->window_rect.width) &&
163  event->event_y >= bsr.y && event->event_y <= con->rect.height + bsr.height)
164  return tiling_resize_for_border(con, BORDER_RIGHT, event);
165 
166  if (event->event_y >= (con->window_rect.y + con->window_rect.height))
167  return tiling_resize_for_border(con, BORDER_BOTTOM, event);
168 
169  return false;
170 }
171 
172 /*
173  * Being called by handle_button_press, this function calls the appropriate
174  * functions for resizing/dragging.
175  *
176  */
177 static int route_click(Con *con, xcb_button_press_event_t *event, const bool mod_pressed, const click_destination_t dest) {
178  DLOG("--> click properties: mod = %d, destination = %d\n", mod_pressed, dest);
179  DLOG("--> OUTCOME = %p\n", con);
180  DLOG("type = %d, name = %s\n", con->type, con->name);
181 
182  /* Any click in a workspace should focus that workspace. If the
183  * workspace is on another output we need to do a workspace_show in
184  * order for i3bar (and others) to notice the change in workspace. */
185  Con *ws = con_get_workspace(con);
186  Con *focused_workspace = con_get_workspace(focused);
187 
188  if (!ws) {
189  ws = TAILQ_FIRST(&(output_get_content(con_get_output(con))->focus_head));
190  if (!ws)
191  goto done;
192  }
193 
194  if (ws != focused_workspace)
195  workspace_show(ws);
196  focused_id = XCB_NONE;
197 
198  /* don’t handle dockarea cons, they must not be focused */
199  if (con->parent->type == CT_DOCKAREA)
200  goto done;
201 
202  /* get the floating con */
203  Con *floatingcon = con_inside_floating(con);
204  const bool proportional = (event->state & BIND_SHIFT);
205  const bool in_stacked = (con->parent->layout == L_STACKED || con->parent->layout == L_TABBED);
206 
207  /* 1: see if the user scrolled on the decoration of a stacked/tabbed con */
208  if (in_stacked &&
209  dest == CLICK_DECORATION &&
210  (event->detail == XCB_BUTTON_INDEX_4 ||
211  event->detail == XCB_BUTTON_INDEX_5)) {
212  DLOG("Scrolling on a window decoration\n");
213  orientation_t orientation = (con->parent->layout == L_STACKED ? VERT : HORIZ);
214  /* To prevent scrolling from going outside the container (see ticket
215  * #557), we first check if scrolling is possible at all. */
217  bool scroll_prev_possible = (TAILQ_PREV(focused, nodes_head, nodes) != NULL);
218  bool scroll_next_possible = (TAILQ_NEXT(focused, nodes) != NULL);
219  if (event->detail == XCB_BUTTON_INDEX_4 && scroll_prev_possible)
220  tree_next('p', orientation);
221  else if (event->detail == XCB_BUTTON_INDEX_5 && scroll_next_possible)
222  tree_next('n', orientation);
223  goto done;
224  }
225 
226  /* 2: focus this con. */
227  con_focus(con);
228 
229  /* 3: For floating containers, we also want to raise them on click.
230  * We will skip handling events on floating cons in fullscreen mode */
231  Con *fs = (ws ? con_get_fullscreen_con(ws, CF_OUTPUT) : NULL);
232  if (floatingcon != NULL && fs != con) {
233  floating_raise_con(floatingcon);
234 
235  /* 4: floating_modifier plus left mouse button drags */
236  if (mod_pressed && event->detail == XCB_BUTTON_INDEX_1) {
237  floating_drag_window(floatingcon, event);
238  return 1;
239  }
240 
241  /* 5: resize (floating) if this was a click on the left/right/bottom
242  * border. also try resizing (tiling) if it was a click on the top
243  * border, but continue if that does not work */
244  if (mod_pressed && event->detail == 3) {
245  DLOG("floating resize due to floatingmodifier\n");
246  floating_resize_window(floatingcon, proportional, event);
247  return 1;
248  }
249 
250  if (!in_stacked && dest == CLICK_DECORATION) {
251  /* try tiling resize, but continue if it doesn’t work */
252  DLOG("tiling resize with fallback\n");
253  if (tiling_resize(con, event, dest))
254  goto done;
255  }
256 
257  if (dest == CLICK_BORDER) {
258  DLOG("floating resize due to border click\n");
259  floating_resize_window(floatingcon, proportional, event);
260  return 1;
261  }
262 
263  /* 6: dragging, if this was a click on a decoration (which did not lead
264  * to a resize) */
265  if (!in_stacked && dest == CLICK_DECORATION) {
266  floating_drag_window(floatingcon, event);
267  return 1;
268  }
269 
270  goto done;
271  }
272 
273  if (in_stacked) {
274  /* for stacked/tabbed cons, the resizing applies to the parent
275  * container */
276  con = con->parent;
277  }
278 
279  /* 7: floating modifier pressed, initiate a resize */
280  if (dest == CLICK_INSIDE && mod_pressed && event->detail == 3) {
281  if (floating_mod_on_tiled_client(con, event))
282  return 1;
283  }
284  /* 8: otherwise, check for border/decoration clicks and resize */
285  else if ((dest == CLICK_BORDER || dest == CLICK_DECORATION) &&
286  (event->detail == XCB_BUTTON_INDEX_1 ||
287  event->detail == XCB_BUTTON_INDEX_3)) {
288  DLOG("Trying to resize (tiling)\n");
289  tiling_resize(con, event, dest);
290  }
291 
292 done:
293  xcb_allow_events(conn, XCB_ALLOW_REPLAY_POINTER, event->time);
294  xcb_flush(conn);
295  tree_render();
296  return 0;
297 }
298 
299 /*
300  * The button press X callback. This function determines whether the floating
301  * modifier is pressed and where the user clicked (decoration, border, inside
302  * the window).
303  *
304  * Then, route_click is called on the appropriate con.
305  *
306  */
307 int handle_button_press(xcb_button_press_event_t *event) {
308  Con *con;
309  DLOG("Button %d pressed on window 0x%08x\n", event->state, event->event);
310 
311  last_timestamp = event->time;
312 
313  const uint32_t mod = config.floating_modifier;
314  const bool mod_pressed = (mod != 0 && (event->state & mod) == mod);
315  DLOG("floating_mod = %d, detail = %d\n", mod_pressed, event->detail);
316  if ((con = con_by_window_id(event->event)))
317  return route_click(con, event, mod_pressed, CLICK_INSIDE);
318 
319  if (!(con = con_by_frame_id(event->event))) {
320  /* If the root window is clicked, find the relevant output from the
321  * click coordinates and focus the output's active workspace. */
322  if (event->event == root) {
323  Con *output, *ws;
324  TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
325  if (con_is_internal(output) ||
326  !rect_contains(output->rect, event->event_x, event->event_y))
327  continue;
328 
329  ws = TAILQ_FIRST(&(output_get_content(output)->focus_head));
330  if (ws != con_get_workspace(focused)) {
331  workspace_show(ws);
332  tree_render();
333  }
334  return 1;
335  }
336  return 0;
337  }
338 
339  ELOG("Clicked into unknown window?!\n");
340  xcb_allow_events(conn, XCB_ALLOW_REPLAY_POINTER, event->time);
341  xcb_flush(conn);
342  return 0;
343  }
344 
345  /* Check if the click was on the decoration of a child */
346  Con *child;
347  TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
348  if (!rect_contains(child->deco_rect, event->event_x, event->event_y))
349  continue;
350 
351  return route_click(child, event, mod_pressed, CLICK_DECORATION);
352  }
353 
354  return route_click(con, event, mod_pressed, CLICK_BORDER);
355 }