i3
handlers.c
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1 #undef I3__FILE__
2 #define I3__FILE__ "handlers.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  * handlers.c: Small handlers for various events (keypresses, focus changes,
10  * …).
11  *
12  */
13 #include "all.h"
14 
15 #include <time.h>
16 #include <sys/time.h>
17 #include <xcb/randr.h>
18 #include <X11/XKBlib.h>
19 #define SN_API_NOT_YET_FROZEN 1
20 #include <libsn/sn-monitor.h>
21 
22 int randr_base = -1;
23 
24 /* After mapping/unmapping windows, a notify event is generated. However, we don’t want it,
25  since it’d trigger an infinite loop of switching between the different windows when
26  changing workspaces */
27 static SLIST_HEAD(ignore_head, Ignore_Event) ignore_events;
28 
29 /*
30  * Adds the given sequence to the list of events which are ignored.
31  * If this ignore should only affect a specific response_type, pass
32  * response_type, otherwise, pass -1.
33  *
34  * Every ignored sequence number gets garbage collected after 5 seconds.
35  *
36  */
37 void add_ignore_event(const int sequence, const int response_type) {
38  struct Ignore_Event *event = smalloc(sizeof(struct Ignore_Event));
39 
40  event->sequence = sequence;
41  event->response_type = response_type;
42  event->added = time(NULL);
43 
44  SLIST_INSERT_HEAD(&ignore_events, event, ignore_events);
45 }
46 
47 /*
48  * Checks if the given sequence is ignored and returns true if so.
49  *
50  */
51 bool event_is_ignored(const int sequence, const int response_type) {
52  struct Ignore_Event *event;
53  time_t now = time(NULL);
54  for (event = SLIST_FIRST(&ignore_events); event != SLIST_END(&ignore_events);) {
55  if ((now - event->added) > 5) {
56  struct Ignore_Event *save = event;
57  event = SLIST_NEXT(event, ignore_events);
58  SLIST_REMOVE(&ignore_events, save, Ignore_Event, ignore_events);
59  free(save);
60  } else event = SLIST_NEXT(event, ignore_events);
61  }
62 
63  SLIST_FOREACH(event, &ignore_events, ignore_events) {
64  if (event->sequence != sequence)
65  continue;
66 
67  if (event->response_type != -1 &&
68  event->response_type != response_type)
69  continue;
70 
71  /* instead of removing a sequence number we better wait until it gets
72  * garbage collected. it may generate multiple events (there are multiple
73  * enter_notifies for one configure_request, for example). */
74  //SLIST_REMOVE(&ignore_events, event, Ignore_Event, ignore_events);
75  //free(event);
76  return true;
77  }
78 
79  return false;
80 }
81 
82 /*
83  * Called with coordinates of an enter_notify event or motion_notify event
84  * to check if the user crossed virtual screen boundaries and adjust the
85  * current workspace, if so.
86  *
87  */
88 static void check_crossing_screen_boundary(uint32_t x, uint32_t y) {
89  Output *output;
90 
91  /* If the user disable focus follows mouse, we have nothing to do here */
93  return;
94 
95  if ((output = get_output_containing(x, y)) == NULL) {
96  ELOG("ERROR: No such screen\n");
97  return;
98  }
99 
100  if (output->con == NULL) {
101  ELOG("ERROR: The screen is not recognized by i3 (no container associated)\n");
102  return;
103  }
104 
105  /* Focus the output on which the user moved his cursor */
106  Con *old_focused = focused;
107  Con *next = con_descend_focused(output_get_content(output->con));
108  /* Since we are switching outputs, this *must* be a different workspace, so
109  * call workspace_show() */
111  con_focus(next);
112 
113  /* If the focus changed, we re-render to get updated decorations */
114  if (old_focused != focused)
115  tree_render();
116 }
117 
118 /*
119  * When the user moves the mouse pointer onto a window, this callback gets called.
120  *
121  */
122 static void handle_enter_notify(xcb_enter_notify_event_t *event) {
123  Con *con;
124 
125  last_timestamp = event->time;
126 
127  DLOG("enter_notify for %08x, mode = %d, detail %d, serial %d\n",
128  event->event, event->mode, event->detail, event->sequence);
129  DLOG("coordinates %d, %d\n", event->event_x, event->event_y);
130  if (event->mode != XCB_NOTIFY_MODE_NORMAL) {
131  DLOG("This was not a normal notify, ignoring\n");
132  return;
133  }
134  /* Some events are not interesting, because they were not generated
135  * actively by the user, but by reconfiguration of windows */
136  if (event_is_ignored(event->sequence, XCB_ENTER_NOTIFY)) {
137  DLOG("Event ignored\n");
138  return;
139  }
140 
141  bool enter_child = false;
142  /* Get container by frame or by child window */
143  if ((con = con_by_frame_id(event->event)) == NULL) {
144  con = con_by_window_id(event->event);
145  enter_child = true;
146  }
147 
148  /* If not, then the user moved his cursor to the root window. In that case, we adjust c_ws */
149  if (con == NULL) {
150  DLOG("Getting screen at %d x %d\n", event->root_x, event->root_y);
151  check_crossing_screen_boundary(event->root_x, event->root_y);
152  return;
153  }
154 
155  if (con->parent->type == CT_DOCKAREA) {
156  DLOG("Ignoring, this is a dock client\n");
157  return;
158  }
159 
160  /* see if the user entered the window on a certain window decoration */
161  int layout = (enter_child ? con->parent->layout : con->layout);
162  if (layout == L_DEFAULT) {
163  Con *child;
164  TAILQ_FOREACH(child, &(con->nodes_head), nodes)
165  if (rect_contains(child->deco_rect, event->event_x, event->event_y)) {
166  LOG("using child %p / %s instead!\n", child, child->name);
167  con = child;
168  break;
169  }
170  }
171 
172 #if 0
173  if (client->workspace != c_ws && client->workspace->output == c_ws->output) {
174  /* This can happen when a client gets assigned to a different workspace than
175  * the current one (see src/mainx.c:reparent_window). Shortly after it was created,
176  * an enter_notify will follow. */
177  DLOG("enter_notify for a client on a different workspace but the same screen, ignoring\n");
178  return 1;
179  }
180 #endif
181 
183  return;
184 
185  /* Get the currently focused workspace to check if the focus change also
186  * involves changing workspaces. If so, we need to call workspace_show() to
187  * correctly update state and send the IPC event. */
188  Con *ws = con_get_workspace(con);
189  if (ws != con_get_workspace(focused))
190  workspace_show(ws);
191 
192  focused_id = XCB_NONE;
194  tree_render();
195 
196  return;
197 }
198 
199 /*
200  * When the user moves the mouse but does not change the active window
201  * (e.g. when having no windows opened but moving mouse on the root screen
202  * and crossing virtual screen boundaries), this callback gets called.
203  *
204  */
205 static void handle_motion_notify(xcb_motion_notify_event_t *event) {
206 
207  last_timestamp = event->time;
208 
209  /* Skip events where the pointer was over a child window, we are only
210  * interested in events on the root window. */
211  if (event->child != 0)
212  return;
213 
214  Con *con;
215  if ((con = con_by_frame_id(event->event)) == NULL) {
216  DLOG("MotionNotify for an unknown container, checking if it crosses screen boundaries.\n");
217  check_crossing_screen_boundary(event->root_x, event->root_y);
218  return;
219  }
220 
222  return;
223 
224  if (con->layout != L_DEFAULT)
225  return;
226 
227  /* see over which rect the user is */
228  Con *current;
229  TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
230  if (!rect_contains(current->deco_rect, event->event_x, event->event_y))
231  continue;
232 
233  /* We found the rect, let’s see if this window is focused */
234  if (TAILQ_FIRST(&(con->focus_head)) == current)
235  return;
236 
237  con_focus(current);
239  return;
240  }
241 
242  return;
243 }
244 
245 /*
246  * Called when the keyboard mapping changes (for example by using Xmodmap),
247  * we need to update our key bindings then (re-translate symbols).
248  *
249  */
250 static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
251  if (event->request != XCB_MAPPING_KEYBOARD &&
252  event->request != XCB_MAPPING_MODIFIER)
253  return;
254 
255  DLOG("Received mapping_notify for keyboard or modifier mapping, re-grabbing keys\n");
256  xcb_refresh_keyboard_mapping(keysyms, event);
257 
259 
262  grab_all_keys(conn, false);
263 
264  return;
265 }
266 
267 /*
268  * A new window appeared on the screen (=was mapped), so let’s manage it.
269  *
270  */
271 static void handle_map_request(xcb_map_request_event_t *event) {
272  xcb_get_window_attributes_cookie_t cookie;
273 
274  cookie = xcb_get_window_attributes_unchecked(conn, event->window);
275 
276  DLOG("window = 0x%08x, serial is %d.\n", event->window, event->sequence);
277  add_ignore_event(event->sequence, -1);
278 
279  manage_window(event->window, cookie, false);
281  return;
282 }
283 
284 /*
285  * Configure requests are received when the application wants to resize windows
286  * on their own.
287  *
288  * We generate a synthethic configure notify event to signalize the client its
289  * "new" position.
290  *
291  */
292 static void handle_configure_request(xcb_configure_request_event_t *event) {
293  Con *con;
294 
295  DLOG("window 0x%08x wants to be at %dx%d with %dx%d\n",
296  event->window, event->x, event->y, event->width, event->height);
297 
298  /* For unmanaged windows, we just execute the configure request. As soon as
299  * it gets mapped, we will take over anyways. */
300  if ((con = con_by_window_id(event->window)) == NULL) {
301  DLOG("Configure request for unmanaged window, can do that.\n");
302 
303  uint32_t mask = 0;
304  uint32_t values[7];
305  int c = 0;
306 #define COPY_MASK_MEMBER(mask_member, event_member) do { \
307  if (event->value_mask & mask_member) { \
308  mask |= mask_member; \
309  values[c++] = event->event_member; \
310  } \
311 } while (0)
312 
313  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_X, x);
314  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_Y, y);
315  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_WIDTH, width);
316  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_HEIGHT, height);
317  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_BORDER_WIDTH, border_width);
318  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_SIBLING, sibling);
319  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_STACK_MODE, stack_mode);
320 
321  xcb_configure_window(conn, event->window, mask, values);
322  xcb_flush(conn);
323 
324  return;
325  }
326 
327  DLOG("Configure request!\n");
328 
329  Con *workspace = con_get_workspace(con),
330  *fullscreen = NULL;
331 
332  /* There might not be a corresponding workspace for dock cons, therefore we
333  * have to be careful here. */
334  if (workspace) {
335  fullscreen = con_get_fullscreen_con(workspace, CF_OUTPUT);
336  if (!fullscreen)
337  fullscreen = con_get_fullscreen_con(workspace, CF_GLOBAL);
338  }
339 
340  if (fullscreen != con && con_is_floating(con) && con_is_leaf(con)) {
341  /* find the height for the decorations */
342  int deco_height = config.font.height + 5;
343  /* we actually need to apply the size/position changes to the *parent*
344  * container */
345  Rect bsr = con_border_style_rect(con);
346  if (con->border_style == BS_NORMAL) {
347  bsr.y += deco_height;
348  bsr.height -= deco_height;
349  }
350  Con *floatingcon = con->parent;
351 
352  Rect newrect = floatingcon->rect;
353 
354  if (event->value_mask & XCB_CONFIG_WINDOW_X) {
355  newrect.x = event->x + (-1) * bsr.x;
356  DLOG("proposed x = %d, new x is %d\n", event->x, newrect.x);
357  }
358  if (event->value_mask & XCB_CONFIG_WINDOW_Y) {
359  newrect.y = event->y + (-1) * bsr.y;
360  DLOG("proposed y = %d, new y is %d\n", event->y, newrect.y);
361  }
362  if (event->value_mask & XCB_CONFIG_WINDOW_WIDTH) {
363  newrect.width = event->width + (-1) * bsr.width;
364  newrect.width += con->border_width * 2;
365  DLOG("proposed width = %d, new width is %d (x11 border %d)\n",
366  event->width, newrect.width, con->border_width);
367  }
368  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
369  newrect.height = event->height + (-1) * bsr.height;
370  newrect.height += con->border_width * 2;
371  DLOG("proposed height = %d, new height is %d (x11 border %d)\n",
372  event->height, newrect.height, con->border_width);
373  }
374 
375  DLOG("Container is a floating leaf node, will do that.\n");
376  floating_reposition(floatingcon, newrect);
377  return;
378  }
379 
380  /* Dock windows can be reconfigured in their height */
381  if (con->parent && con->parent->type == CT_DOCKAREA) {
382  DLOG("Dock window, only height reconfiguration allowed\n");
383  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
384  DLOG("Height given, changing\n");
385 
386  con->geometry.height = event->height;
387  tree_render();
388  }
389  }
390 
392 
393  return;
394 }
395 #if 0
396 
397 /*
398  * Configuration notifies are only handled because we need to set up ignore for
399  * the following enter notify events.
400  *
401  */
402 int handle_configure_event(void *prophs, xcb_connection_t *conn, xcb_configure_notify_event_t *event) {
403  DLOG("configure_event, sequence %d\n", event->sequence);
404  /* We ignore this sequence twice because events for child and frame should be ignored */
405  add_ignore_event(event->sequence);
406  add_ignore_event(event->sequence);
407 
408  return 1;
409 }
410 #endif
411 
412 /*
413  * Gets triggered upon a RandR screen change event, that is when the user
414  * changes the screen configuration in any way (mode, position, …)
415  *
416  */
417 static void handle_screen_change(xcb_generic_event_t *e) {
418  DLOG("RandR screen change\n");
419 
421 
423 
424  ipc_send_event("output", I3_IPC_EVENT_OUTPUT, "{\"change\":\"unspecified\"}");
425 
426  return;
427 }
428 
429 /*
430  * Our window decorations were unmapped. That means, the window will be killed
431  * now, so we better clean up before.
432  *
433  */
434 static void handle_unmap_notify_event(xcb_unmap_notify_event_t *event) {
435  DLOG("UnmapNotify for 0x%08x (received from 0x%08x), serial %d\n", event->window, event->event, event->sequence);
436  xcb_get_input_focus_cookie_t cookie;
437  Con *con = con_by_window_id(event->window);
438  if (con == NULL) {
439  /* This could also be an UnmapNotify for the frame. We need to
440  * decrement the ignore_unmap counter. */
441  con = con_by_frame_id(event->window);
442  if (con == NULL) {
443  LOG("Not a managed window, ignoring UnmapNotify event\n");
444  return;
445  }
446 
447  if (con->ignore_unmap > 0)
448  con->ignore_unmap--;
449  /* See the end of this function. */
450  cookie = xcb_get_input_focus(conn);
451  DLOG("ignore_unmap = %d for frame of container %p\n", con->ignore_unmap, con);
452  goto ignore_end;
453  }
454 
455  /* See the end of this function. */
456  cookie = xcb_get_input_focus(conn);
457 
458  if (con->ignore_unmap > 0) {
459  DLOG("ignore_unmap = %d, dec\n", con->ignore_unmap);
460  con->ignore_unmap--;
461  goto ignore_end;
462  }
463 
464  tree_close(con, DONT_KILL_WINDOW, false, false);
465  tree_render();
467 
468 ignore_end:
469  /* If the client (as opposed to i3) destroyed or unmapped a window, an
470  * EnterNotify event will follow (indistinguishable from an EnterNotify
471  * event caused by moving your mouse), causing i3 to set focus to whichever
472  * window is now visible.
473  *
474  * In a complex stacked or tabbed layout (take two v-split containers in a
475  * tabbed container), when the bottom window in tab2 is closed, the bottom
476  * window of tab1 is visible instead. X11 will thus send an EnterNotify
477  * event for the bottom window of tab1, while the focus should be set to
478  * the remaining window of tab2.
479  *
480  * Therefore, we ignore all EnterNotify events which have the same sequence
481  * as an UnmapNotify event. */
482  add_ignore_event(event->sequence, XCB_ENTER_NOTIFY);
483 
484  /* Since we just ignored the sequence of this UnmapNotify, we want to make
485  * sure that following events use a different sequence. When putting xterm
486  * into fullscreen and moving the pointer to a different window, without
487  * using GetInputFocus, subsequent (legitimate) EnterNotify events arrived
488  * with the same sequence and thus were ignored (see ticket #609). */
489  free(xcb_get_input_focus_reply(conn, cookie, NULL));
490 }
491 
492 /*
493  * A destroy notify event is sent when the window is not unmapped, but
494  * immediately destroyed (for example when starting a window and immediately
495  * killing the program which started it).
496  *
497  * We just pass on the event to the unmap notify handler (by copying the
498  * important fields in the event data structure).
499  *
500  */
501 static void handle_destroy_notify_event(xcb_destroy_notify_event_t *event) {
502  DLOG("destroy notify for 0x%08x, 0x%08x\n", event->event, event->window);
503 
504  xcb_unmap_notify_event_t unmap;
505  unmap.sequence = event->sequence;
506  unmap.event = event->event;
507  unmap.window = event->window;
508 
510 }
511 
512 /*
513  * Called when a window changes its title
514  *
515  */
516 static bool handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
517  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
518  Con *con;
519  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
520  return false;
521 
522  window_update_name(con->window, prop, false);
523 
525 
526  return true;
527 }
528 
529 /*
530  * Handles legacy window name updates (WM_NAME), see also src/window.c,
531  * window_update_name_legacy().
532  *
533  */
534 static bool handle_windowname_change_legacy(void *data, xcb_connection_t *conn, uint8_t state,
535  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
536  Con *con;
537  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
538  return false;
539 
540  window_update_name_legacy(con->window, prop, false);
541 
543 
544  return true;
545 }
546 
547 /*
548  * Called when a window changes its WM_WINDOW_ROLE.
549  *
550  */
551 static bool handle_windowrole_change(void *data, xcb_connection_t *conn, uint8_t state,
552  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
553  Con *con;
554  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
555  return false;
556 
557  window_update_role(con->window, prop, false);
558 
559  return true;
560 }
561 
562 #if 0
563 /*
564  * Updates the client’s WM_CLASS property
565  *
566  */
567 static int handle_windowclass_change(void *data, xcb_connection_t *conn, uint8_t state,
568  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
569  Con *con;
570  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
571  return 1;
572 
573  window_update_class(con->window, prop, false);
574 
575  return 0;
576 }
577 #endif
578 
579 /*
580  * Expose event means we should redraw our windows (= title bar)
581  *
582  */
583 static void handle_expose_event(xcb_expose_event_t *event) {
584  Con *parent;
585 
586  DLOG("window = %08x\n", event->window);
587 
588  if ((parent = con_by_frame_id(event->window)) == NULL) {
589  LOG("expose event for unknown window, ignoring\n");
590  return;
591  }
592 
593  /* Since we render to our pixmap on every change anyways, expose events
594  * only tell us that the X server lost (parts of) the window contents. We
595  * can handle that by copying the appropriate part from our pixmap to the
596  * window. */
597  xcb_copy_area(conn, parent->pixmap, parent->frame, parent->pm_gc,
598  event->x, event->y, event->x, event->y,
599  event->width, event->height);
600  xcb_flush(conn);
601 
602  return;
603 }
604 
605 /*
606  * Handle client messages (EWMH)
607  *
608  */
609 static void handle_client_message(xcb_client_message_event_t *event) {
610  /* If this is a startup notification ClientMessage, the library will handle
611  * it and call our monitor_event() callback. */
612  if (sn_xcb_display_process_event(sndisplay, (xcb_generic_event_t*)event))
613  return;
614 
615  LOG("ClientMessage for window 0x%08x\n", event->window);
616  if (event->type == A__NET_WM_STATE) {
617  if (event->format != 32 || event->data.data32[1] != A__NET_WM_STATE_FULLSCREEN) {
618  DLOG("atom in clientmessage is %d, fullscreen is %d\n",
619  event->data.data32[1], A__NET_WM_STATE_FULLSCREEN);
620  DLOG("not about fullscreen atom\n");
621  return;
622  }
623 
624  Con *con = con_by_window_id(event->window);
625  if (con == NULL) {
626  DLOG("Could not get window for client message\n");
627  return;
628  }
629 
630  /* Check if the fullscreen state should be toggled */
631  if ((con->fullscreen_mode != CF_NONE &&
632  (event->data.data32[0] == _NET_WM_STATE_REMOVE ||
633  event->data.data32[0] == _NET_WM_STATE_TOGGLE)) ||
634  (con->fullscreen_mode == CF_NONE &&
635  (event->data.data32[0] == _NET_WM_STATE_ADD ||
636  event->data.data32[0] == _NET_WM_STATE_TOGGLE))) {
637  DLOG("toggling fullscreen\n");
638  con_toggle_fullscreen(con, CF_OUTPUT);
639  }
640 
641  tree_render();
642  } else if (event->type == A__NET_ACTIVE_WINDOW) {
643  DLOG("_NET_ACTIVE_WINDOW: Window 0x%08x should be activated\n", event->window);
644  Con *con = con_by_window_id(event->window);
645  if (con == NULL) {
646  DLOG("Could not get window for client message\n");
647  return;
648  }
649 
650  Con *ws = con_get_workspace(con);
651  if (!workspace_is_visible(ws)) {
652  DLOG("Workspace not visible, ignoring _NET_ACTIVE_WINDOW\n");
653  return;
654  }
655 
656  if (ws != con_get_workspace(focused))
657  workspace_show(ws);
658 
659  con_focus(con);
660  tree_render();
661  } else if (event->type == A_I3_SYNC) {
662  xcb_window_t window = event->data.data32[0];
663  uint32_t rnd = event->data.data32[1];
664  DLOG("[i3 sync protocol] Sending random value %d back to X11 window 0x%08x\n", rnd, window);
665 
666  void *reply = scalloc(32);
667  xcb_client_message_event_t *ev = reply;
668 
669  ev->response_type = XCB_CLIENT_MESSAGE;
670  ev->window = window;
671  ev->type = A_I3_SYNC;
672  ev->format = 32;
673  ev->data.data32[0] = window;
674  ev->data.data32[1] = rnd;
675 
676  xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
677  xcb_flush(conn);
678  free(reply);
679  } else {
680  DLOG("unhandled clientmessage\n");
681  return;
682  }
683 }
684 
685 #if 0
686 int handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
687  xcb_atom_t atom, xcb_get_property_reply_t *property) {
688  /* TODO: Implement this one. To do this, implement a little test program which sleep(1)s
689  before changing this property. */
690  ELOG("_NET_WM_WINDOW_TYPE changed, this is not yet implemented.\n");
691  return 0;
692 }
693 #endif
694 
695 /*
696  * Handles the size hints set by a window, but currently only the part necessary for displaying
697  * clients proportionally inside their frames (mplayer for example)
698  *
699  * See ICCCM 4.1.2.3 for more details
700  *
701  */
702 static bool handle_normal_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
703  xcb_atom_t name, xcb_get_property_reply_t *reply) {
704  Con *con = con_by_window_id(window);
705  if (con == NULL) {
706  DLOG("Received WM_NORMAL_HINTS for unknown client\n");
707  return false;
708  }
709 
710  xcb_size_hints_t size_hints;
711 
712  //CLIENT_LOG(client);
713 
714  /* If the hints were already in this event, use them, if not, request them */
715  if (reply != NULL)
716  xcb_icccm_get_wm_size_hints_from_reply(&size_hints, reply);
717  else
719 
720  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE)) {
721  // TODO: Minimum size is not yet implemented
722  DLOG("Minimum size: %d (width) x %d (height)\n", size_hints.min_width, size_hints.min_height);
723  }
724 
725  bool changed = false;
726  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_RESIZE_INC)) {
727  if (size_hints.width_inc > 0 && size_hints.width_inc < 0xFFFF)
728  if (con->width_increment != size_hints.width_inc) {
729  con->width_increment = size_hints.width_inc;
730  changed = true;
731  }
732  if (size_hints.height_inc > 0 && size_hints.height_inc < 0xFFFF)
733  if (con->height_increment != size_hints.height_inc) {
734  con->height_increment = size_hints.height_inc;
735  changed = true;
736  }
737 
738  if (changed)
739  DLOG("resize increments changed\n");
740  }
741 
742  int base_width = 0, base_height = 0;
743 
744  /* base_width/height are the desired size of the window.
745  We check if either the program-specified size or the program-specified
746  min-size is available */
747  if (size_hints.flags & XCB_ICCCM_SIZE_HINT_BASE_SIZE) {
748  base_width = size_hints.base_width;
749  base_height = size_hints.base_height;
750  } else if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE) {
751  /* TODO: is this right? icccm says not */
752  base_width = size_hints.min_width;
753  base_height = size_hints.min_height;
754  }
755 
756  if (base_width != con->base_width ||
757  base_height != con->base_height) {
758  con->base_width = base_width;
759  con->base_height = base_height;
760  DLOG("client's base_height changed to %d\n", base_height);
761  DLOG("client's base_width changed to %d\n", base_width);
762  changed = true;
763  }
764 
765  /* If no aspect ratio was set or if it was invalid, we ignore the hints */
766  if (!(size_hints.flags & XCB_ICCCM_SIZE_HINT_P_ASPECT) ||
767  (size_hints.min_aspect_num <= 0) ||
768  (size_hints.min_aspect_den <= 0)) {
769  goto render_and_return;
770  }
771 
772  /* XXX: do we really use rect here, not window_rect? */
773  double width = con->rect.width - base_width;
774  double height = con->rect.height - base_height;
775  /* Convert numerator/denominator to a double */
776  double min_aspect = (double)size_hints.min_aspect_num / size_hints.min_aspect_den;
777  double max_aspect = (double)size_hints.max_aspect_num / size_hints.min_aspect_den;
778 
779  DLOG("Aspect ratio set: minimum %f, maximum %f\n", min_aspect, max_aspect);
780  DLOG("width = %f, height = %f\n", width, height);
781 
782  /* Sanity checks, this is user-input, in a way */
783  if (max_aspect <= 0 || min_aspect <= 0 || height == 0 || (width / height) <= 0)
784  goto render_and_return;
785 
786  /* Check if we need to set proportional_* variables using the correct ratio */
787  if ((width / height) < min_aspect) {
788  if (con->proportional_width != width ||
789  con->proportional_height != (width / min_aspect)) {
790  con->proportional_width = width;
791  con->proportional_height = width / min_aspect;
792  changed = true;
793  }
794  } else if ((width / height) > max_aspect) {
795  if (con->proportional_width != width ||
796  con->proportional_height != (width / max_aspect)) {
797  con->proportional_width = width;
798  con->proportional_height = width / max_aspect;
799  changed = true;
800  }
801  } else goto render_and_return;
802 
803 render_and_return:
804  if (changed)
805  tree_render();
806  FREE(reply);
807  return true;
808 }
809 
810 /*
811  * Handles the WM_HINTS property for extracting the urgency state of the window.
812  *
813  */
814 static bool handle_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
815  xcb_atom_t name, xcb_get_property_reply_t *reply) {
816  Con *con = con_by_window_id(window);
817  if (con == NULL) {
818  DLOG("Received WM_HINTS for unknown client\n");
819  return false;
820  }
821 
822  xcb_icccm_wm_hints_t hints;
823 
824  if (reply == NULL)
825  if (!(reply = xcb_get_property_reply(conn, xcb_icccm_get_wm_hints(conn, window), NULL)))
826  return false;
827 
828  if (!xcb_icccm_get_wm_hints_from_reply(&hints, reply))
829  return false;
830 
831  if (!con->urgent && focused == con) {
832  DLOG("Ignoring urgency flag for current client\n");
833  con->window->urgent.tv_sec = 0;
834  con->window->urgent.tv_usec = 0;
835  goto end;
836  }
837 
838  /* Update the flag on the client directly */
839  con->urgent = (xcb_icccm_wm_hints_get_urgency(&hints) != 0);
840  //CLIENT_LOG(con);
841  if (con->window) {
842  if (con->urgent) {
843  gettimeofday(&con->window->urgent, NULL);
844  } else {
845  con->window->urgent.tv_sec = 0;
846  con->window->urgent.tv_usec = 0;
847  }
848  }
849  LOG("Urgency flag changed to %d\n", con->urgent);
850 
851  Con *ws;
852  /* Set the urgency flag on the workspace, if a workspace could be found
853  * (for dock clients, that is not the case). */
854  if ((ws = con_get_workspace(con)) != NULL)
856 
857  tree_render();
858 
859 end:
860  if (con->window)
861  window_update_hints(con->window, reply);
862  else free(reply);
863  return true;
864 }
865 
866 /*
867  * Handles the transient for hints set by a window, signalizing that this window is a popup window
868  * for some other window.
869  *
870  * See ICCCM 4.1.2.6 for more details
871  *
872  */
873 static bool handle_transient_for(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
874  xcb_atom_t name, xcb_get_property_reply_t *prop) {
875  Con *con;
876 
877  if ((con = con_by_window_id(window)) == NULL || con->window == NULL) {
878  DLOG("No such window\n");
879  return false;
880  }
881 
882  if (prop == NULL) {
883  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
884  false, window, XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 0, 32), NULL);
885  if (prop == NULL)
886  return false;
887  }
888 
890 
891  return true;
892 }
893 
894 /*
895  * Handles changes of the WM_CLIENT_LEADER atom which specifies if this is a
896  * toolwindow (or similar) and to which window it belongs (logical parent).
897  *
898  */
899 static bool handle_clientleader_change(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
900  xcb_atom_t name, xcb_get_property_reply_t *prop) {
901  Con *con;
902  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
903  return false;
904 
905  if (prop == NULL) {
906  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
907  false, window, A_WM_CLIENT_LEADER, XCB_ATOM_WINDOW, 0, 32), NULL);
908  if (prop == NULL)
909  return false;
910  }
911 
912  window_update_leader(con->window, prop);
913 
914  return true;
915 }
916 
917 /*
918  * Handles FocusIn events which are generated by clients (i3’s focus changes
919  * don’t generate FocusIn events due to a different EventMask) and updates the
920  * decorations accordingly.
921  *
922  */
923 static void handle_focus_in(xcb_focus_in_event_t *event) {
924  DLOG("focus change in, for window 0x%08x\n", event->event);
925  Con *con;
926  if ((con = con_by_window_id(event->event)) == NULL || con->window == NULL)
927  return;
928  DLOG("That is con %p / %s\n", con, con->name);
929 
930  if (event->mode == XCB_NOTIFY_MODE_GRAB ||
931  event->mode == XCB_NOTIFY_MODE_UNGRAB) {
932  DLOG("FocusIn event for grab/ungrab, ignoring\n");
933  return;
934  }
935 
936  if (event->detail == XCB_NOTIFY_DETAIL_POINTER) {
937  DLOG("notify detail is pointer, ignoring this event\n");
938  return;
939  }
940 
941  if (focused_id == event->event) {
942  DLOG("focus matches the currently focused window, not doing anything\n");
943  return;
944  }
945 
946  /* Skip dock clients, they cannot get the i3 focus. */
947  if (con->parent->type == CT_DOCKAREA) {
948  DLOG("This is a dock client, not focusing.\n");
949  return;
950  }
951 
952  DLOG("focus is different, updating decorations\n");
953 
954  /* Get the currently focused workspace to check if the focus change also
955  * involves changing workspaces. If so, we need to call workspace_show() to
956  * correctly update state and send the IPC event. */
957  Con *ws = con_get_workspace(con);
958  if (ws != con_get_workspace(focused))
959  workspace_show(ws);
960 
961  con_focus(con);
962  /* We update focused_id because we don’t need to set focus again */
963  focused_id = event->event;
965  return;
966 }
967 
968 /* Returns false if the event could not be processed (e.g. the window could not
969  * be found), true otherwise */
970 typedef bool (*cb_property_handler_t)(void *data, xcb_connection_t *c, uint8_t state, xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *property);
971 
973  xcb_atom_t atom;
974  uint32_t long_len;
976 };
977 
979  { 0, 128, handle_windowname_change },
980  { 0, UINT_MAX, handle_hints },
982  { 0, UINT_MAX, handle_normal_hints },
983  { 0, UINT_MAX, handle_clientleader_change },
984  { 0, UINT_MAX, handle_transient_for },
985  { 0, 128, handle_windowrole_change }
986 };
987 #define NUM_HANDLERS (sizeof(property_handlers) / sizeof(struct property_handler_t))
988 
989 /*
990  * Sets the appropriate atoms for the property handlers after the atoms were
991  * received from X11
992  *
993  */
995 
996  sn_monitor_context_new(sndisplay, conn_screen, startup_monitor_event, NULL, NULL);
997 
998  property_handlers[0].atom = A__NET_WM_NAME;
999  property_handlers[1].atom = XCB_ATOM_WM_HINTS;
1000  property_handlers[2].atom = XCB_ATOM_WM_NAME;
1001  property_handlers[3].atom = XCB_ATOM_WM_NORMAL_HINTS;
1002  property_handlers[4].atom = A_WM_CLIENT_LEADER;
1003  property_handlers[5].atom = XCB_ATOM_WM_TRANSIENT_FOR;
1004  property_handlers[6].atom = A_WM_WINDOW_ROLE;
1005 }
1006 
1007 static void property_notify(uint8_t state, xcb_window_t window, xcb_atom_t atom) {
1008  struct property_handler_t *handler = NULL;
1009  xcb_get_property_reply_t *propr = NULL;
1010 
1011  for (int c = 0; c < sizeof(property_handlers) / sizeof(struct property_handler_t); c++) {
1012  if (property_handlers[c].atom != atom)
1013  continue;
1014 
1015  handler = &property_handlers[c];
1016  break;
1017  }
1018 
1019  if (handler == NULL) {
1020  //DLOG("Unhandled property notify for atom %d (0x%08x)\n", atom, atom);
1021  return;
1022  }
1023 
1024  if (state != XCB_PROPERTY_DELETE) {
1025  xcb_get_property_cookie_t cookie = xcb_get_property(conn, 0, window, atom, XCB_GET_PROPERTY_TYPE_ANY, 0, handler->long_len);
1026  propr = xcb_get_property_reply(conn, cookie, 0);
1027  }
1028 
1029  /* the handler will free() the reply unless it returns false */
1030  if (!handler->cb(NULL, conn, state, window, atom, propr))
1031  FREE(propr);
1032 }
1033 
1034 /*
1035  * Takes an xcb_generic_event_t and calls the appropriate handler, based on the
1036  * event type.
1037  *
1038  */
1039 void handle_event(int type, xcb_generic_event_t *event) {
1040  if (randr_base > -1 &&
1041  type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) {
1042  handle_screen_change(event);
1043  return;
1044  }
1045 
1046  switch (type) {
1047  case XCB_KEY_PRESS:
1048  case XCB_KEY_RELEASE:
1049  handle_key_press((xcb_key_press_event_t*)event);
1050  break;
1051 
1052  case XCB_BUTTON_PRESS:
1053  handle_button_press((xcb_button_press_event_t*)event);
1054  break;
1055 
1056  case XCB_MAP_REQUEST:
1057  handle_map_request((xcb_map_request_event_t*)event);
1058  break;
1059 
1060  case XCB_UNMAP_NOTIFY:
1061  handle_unmap_notify_event((xcb_unmap_notify_event_t*)event);
1062  break;
1063 
1064  case XCB_DESTROY_NOTIFY:
1065  handle_destroy_notify_event((xcb_destroy_notify_event_t*)event);
1066  break;
1067 
1068  case XCB_EXPOSE:
1069  handle_expose_event((xcb_expose_event_t*)event);
1070  break;
1071 
1072  case XCB_MOTION_NOTIFY:
1073  handle_motion_notify((xcb_motion_notify_event_t*)event);
1074  break;
1075 
1076  /* Enter window = user moved his mouse over the window */
1077  case XCB_ENTER_NOTIFY:
1078  handle_enter_notify((xcb_enter_notify_event_t*)event);
1079  break;
1080 
1081  /* Client message are sent to the root window. The only interesting
1082  * client message for us is _NET_WM_STATE, we honour
1083  * _NET_WM_STATE_FULLSCREEN */
1084  case XCB_CLIENT_MESSAGE:
1085  handle_client_message((xcb_client_message_event_t*)event);
1086  break;
1087 
1088  /* Configure request = window tried to change size on its own */
1089  case XCB_CONFIGURE_REQUEST:
1090  handle_configure_request((xcb_configure_request_event_t*)event);
1091  break;
1092 
1093  /* Mapping notify = keyboard mapping changed (Xmodmap), re-grab bindings */
1094  case XCB_MAPPING_NOTIFY:
1095  handle_mapping_notify((xcb_mapping_notify_event_t*)event);
1096  break;
1097 
1098  case XCB_FOCUS_IN:
1099  handle_focus_in((xcb_focus_in_event_t*)event);
1100  break;
1101 
1102  case XCB_PROPERTY_NOTIFY: {
1103  xcb_property_notify_event_t *e = (xcb_property_notify_event_t*)event;
1104  last_timestamp = e->time;
1105  property_notify(e->state, e->window, e->atom);
1106  break;
1107  }
1108 
1109  default:
1110  //DLOG("Unhandled event of type %d\n", type);
1111  break;
1112  }
1113 }