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  /* don’t handle dockarea cons, they must not be focused */
183  if (con->parent->type == CT_DOCKAREA)
184  goto done;
185 
186  /* get the floating con */
187  Con *floatingcon = con_inside_floating(con);
188  const bool proportional = (event->state & BIND_SHIFT);
189  const bool in_stacked = (con->parent->layout == L_STACKED || con->parent->layout == L_TABBED);
190 
191  /* 1: see if the user scrolled on the decoration of a stacked/tabbed con */
192  if (in_stacked &&
193  dest == CLICK_DECORATION &&
194  (event->detail == XCB_BUTTON_INDEX_4 ||
195  event->detail == XCB_BUTTON_INDEX_5)) {
196  DLOG("Scrolling on a window decoration\n");
197  orientation_t orientation = (con->parent->layout == L_STACKED ? VERT : HORIZ);
198  /* To prevent scrolling from going outside the container (see ticket
199  * #557), we first check if scrolling is possible at all. */
201  bool scroll_prev_possible = (TAILQ_PREV(focused, nodes_head, nodes) != NULL);
202  bool scroll_next_possible = (TAILQ_NEXT(focused, nodes) != NULL);
203  if (event->detail == XCB_BUTTON_INDEX_4 && scroll_prev_possible)
204  tree_next('p', orientation);
205  else if (event->detail == XCB_BUTTON_INDEX_5 && scroll_next_possible)
206  tree_next('n', orientation);
207  goto done;
208  }
209 
210  /* 2: focus this con. If the workspace is on another output we need to
211  * do a workspace_show in order for i3bar (and others) to notice the
212  * change in workspace. */
213  Con *ws = con_get_workspace(con);
214  Con *focused_workspace = con_get_workspace(focused);
215 
216  if (ws != focused_workspace)
217  workspace_show(ws);
218  focused_id = XCB_NONE;
219  con_focus(con);
220 
221  /* 3: For floating containers, we also want to raise them on click.
222  * We will skip handling events on floating cons in fullscreen mode */
223  Con *fs = (ws ? con_get_fullscreen_con(ws, CF_OUTPUT) : NULL);
224  if (floatingcon != NULL && fs == NULL) {
225  floating_raise_con(floatingcon);
226 
227  /* 4: floating_modifier plus left mouse button drags */
228  if (mod_pressed && event->detail == XCB_BUTTON_INDEX_1) {
229  floating_drag_window(floatingcon, event);
230  return 1;
231  }
232 
233  /* 5: resize (floating) if this was a click on the left/right/bottom
234  * border. also try resizing (tiling) if it was a click on the top
235  * border, but continue if that does not work */
236  if (mod_pressed && event->detail == 3) {
237  DLOG("floating resize due to floatingmodifier\n");
238  floating_resize_window(floatingcon, proportional, event);
239  return 1;
240  }
241 
242  if (!in_stacked && dest == CLICK_DECORATION) {
243  /* try tiling resize, but continue if it doesn’t work */
244  DLOG("tiling resize with fallback\n");
245  if (tiling_resize(con, event, dest))
246  goto done;
247  }
248 
249  if (dest == CLICK_BORDER) {
250  DLOG("floating resize due to border click\n");
251  floating_resize_window(floatingcon, proportional, event);
252  return 1;
253  }
254 
255  /* 6: dragging, if this was a click on a decoration (which did not lead
256  * to a resize) */
257  if (!in_stacked && dest == CLICK_DECORATION) {
258  floating_drag_window(floatingcon, event);
259  return 1;
260  }
261 
262  goto done;
263  }
264 
265  if (in_stacked) {
266  /* for stacked/tabbed cons, the resizing applies to the parent
267  * container */
268  con = con->parent;
269  }
270 
271  /* 7: floating modifier pressed, initiate a resize */
272  if (dest == CLICK_INSIDE && mod_pressed && event->detail == 3) {
273  if (floating_mod_on_tiled_client(con, event))
274  return 1;
275  }
276  /* 8: otherwise, check for border/decoration clicks and resize */
277  else if ((dest == CLICK_BORDER || dest == CLICK_DECORATION) &&
278  (event->detail == XCB_BUTTON_INDEX_1 ||
279  event->detail == XCB_BUTTON_INDEX_3)) {
280  DLOG("Trying to resize (tiling)\n");
281  tiling_resize(con, event, dest);
282  }
283 
284 done:
285  xcb_allow_events(conn, XCB_ALLOW_REPLAY_POINTER, event->time);
286  xcb_flush(conn);
287  tree_render();
288  return 0;
289 }
290 
291 /*
292  * The button press X callback. This function determines whether the floating
293  * modifier is pressed and where the user clicked (decoration, border, inside
294  * the window).
295  *
296  * Then, route_click is called on the appropriate con.
297  *
298  */
299 int handle_button_press(xcb_button_press_event_t *event) {
300  Con *con;
301  DLOG("Button %d pressed on window 0x%08x\n", event->state, event->event);
302 
303  last_timestamp = event->time;
304 
305  const uint32_t mod = config.floating_modifier;
306  const bool mod_pressed = (mod != 0 && (event->state & mod) == mod);
307  DLOG("floating_mod = %d, detail = %d\n", mod_pressed, event->detail);
308  if ((con = con_by_window_id(event->event)))
309  return route_click(con, event, mod_pressed, CLICK_INSIDE);
310 
311  if (!(con = con_by_frame_id(event->event))) {
312  ELOG("Clicked into unknown window?!\n");
313  xcb_allow_events(conn, XCB_ALLOW_REPLAY_POINTER, event->time);
314  xcb_flush(conn);
315  return 0;
316  }
317 
318  /* Check if the click was on the decoration of a child */
319  Con *child;
320  TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
321  if (!rect_contains(child->deco_rect, event->event_x, event->event_y))
322  continue;
323 
324  return route_click(child, event, mod_pressed, CLICK_DECORATION);
325  }
326 
327  return route_click(con, event, mod_pressed, CLICK_BORDER);
328 }