i3
handlers.c
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1 /*
2  * vim:ts=4:sw=4:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
6  *
7  * handlers.c: Small handlers for various events (keypresses, focus changes,
8  * …).
9  *
10  */
11 #include "all.h"
12 
13 #include <time.h>
14 #include <sys/time.h>
15 #include <xcb/randr.h>
16 #include <X11/XKBlib.h>
17 #define SN_API_NOT_YET_FROZEN 1
18 #include <libsn/sn-monitor.h>
19 
20 int randr_base = -1;
21 
22 /* After mapping/unmapping windows, a notify event is generated. However, we don’t want it,
23  since it’d trigger an infinite loop of switching between the different windows when
24  changing workspaces */
25 static SLIST_HEAD(ignore_head, Ignore_Event) ignore_events;
26 
27 /*
28  * Adds the given sequence to the list of events which are ignored.
29  * If this ignore should only affect a specific response_type, pass
30  * response_type, otherwise, pass -1.
31  *
32  * Every ignored sequence number gets garbage collected after 5 seconds.
33  *
34  */
35 void add_ignore_event(const int sequence, const int response_type) {
36  struct Ignore_Event *event = smalloc(sizeof(struct Ignore_Event));
37 
38  event->sequence = sequence;
39  event->response_type = response_type;
40  event->added = time(NULL);
41 
42  SLIST_INSERT_HEAD(&ignore_events, event, ignore_events);
43 }
44 
45 /*
46  * Checks if the given sequence is ignored and returns true if so.
47  *
48  */
49 bool event_is_ignored(const int sequence, const int response_type) {
50  struct Ignore_Event *event;
51  time_t now = time(NULL);
52  for (event = SLIST_FIRST(&ignore_events); event != SLIST_END(&ignore_events);) {
53  if ((now - event->added) > 5) {
54  struct Ignore_Event *save = event;
55  event = SLIST_NEXT(event, ignore_events);
56  SLIST_REMOVE(&ignore_events, save, Ignore_Event, ignore_events);
57  free(save);
58  } else event = SLIST_NEXT(event, ignore_events);
59  }
60 
61  SLIST_FOREACH(event, &ignore_events, ignore_events) {
62  if (event->sequence != sequence)
63  continue;
64 
65  if (event->response_type != -1 &&
66  event->response_type != response_type)
67  continue;
68 
69  /* instead of removing a sequence number we better wait until it gets
70  * garbage collected. it may generate multiple events (there are multiple
71  * enter_notifies for one configure_request, for example). */
72  //SLIST_REMOVE(&ignore_events, event, Ignore_Event, ignore_events);
73  //free(event);
74  return true;
75  }
76 
77  return false;
78 }
79 
80 
81 /*
82  * There was a key press. We compare this key code with our bindings table and pass
83  * the bound action to parse_command().
84  *
85  */
86 static void handle_key_press(xcb_key_press_event_t *event) {
87 
88  last_timestamp = event->time;
89 
90  DLOG("Keypress %d, state raw = %d\n", event->detail, event->state);
91 
92  /* Remove the numlock bit, all other bits are modifiers we can bind to */
93  uint16_t state_filtered = event->state & ~(xcb_numlock_mask | XCB_MOD_MASK_LOCK);
94  DLOG("(removed numlock, state = %d)\n", state_filtered);
95  /* Only use the lower 8 bits of the state (modifier masks) so that mouse
96  * button masks are filtered out */
97  state_filtered &= 0xFF;
98  DLOG("(removed upper 8 bits, state = %d)\n", state_filtered);
99 
100  if (xkb_current_group == XkbGroup2Index)
101  state_filtered |= BIND_MODE_SWITCH;
102 
103  DLOG("(checked mode_switch, state %d)\n", state_filtered);
104 
105  /* Find the binding */
106  Binding *bind = get_binding(state_filtered, event->detail);
107 
108  /* No match? Then the user has Mode_switch enabled but does not have a
109  * specific keybinding. Fall back to the default keybindings (without
110  * Mode_switch). Makes it much more convenient for users of a hybrid
111  * layout (like us, ru). */
112  if (bind == NULL) {
113  state_filtered &= ~(BIND_MODE_SWITCH);
114  DLOG("no match, new state_filtered = %d\n", state_filtered);
115  if ((bind = get_binding(state_filtered, event->detail)) == NULL) {
116  ELOG("Could not lookup key binding (modifiers %d, keycode %d)\n",
117  state_filtered, event->detail);
118  return;
119  }
120  }
121 
123 
124  if (command_output->needs_tree_render)
125  tree_render();
126 
127  free(command_output->json_output);
128 }
129 
130 /*
131  * Called with coordinates of an enter_notify event or motion_notify event
132  * to check if the user crossed virtual screen boundaries and adjust the
133  * current workspace, if so.
134  *
135  */
136 static void check_crossing_screen_boundary(uint32_t x, uint32_t y) {
137  Output *output;
138 
139  /* If the user disable focus follows mouse, we have nothing to do here */
141  return;
142 
143  if ((output = get_output_containing(x, y)) == NULL) {
144  ELOG("ERROR: No such screen\n");
145  return;
146  }
147 
148  if (output->con == NULL) {
149  ELOG("ERROR: The screen is not recognized by i3 (no container associated)\n");
150  return;
151  }
152 
153  /* Focus the output on which the user moved his cursor */
154  Con *old_focused = focused;
155  Con *next = con_descend_focused(output_get_content(output->con));
156  /* Since we are switching outputs, this *must* be a different workspace, so
157  * call workspace_show() */
159  con_focus(next);
160 
161  /* If the focus changed, we re-render to get updated decorations */
162  if (old_focused != focused)
163  tree_render();
164 }
165 
166 /*
167  * When the user moves the mouse pointer onto a window, this callback gets called.
168  *
169  */
170 static void handle_enter_notify(xcb_enter_notify_event_t *event) {
171  Con *con;
172 
173  last_timestamp = event->time;
174 
175  DLOG("enter_notify for %08x, mode = %d, detail %d, serial %d\n",
176  event->event, event->mode, event->detail, event->sequence);
177  DLOG("coordinates %d, %d\n", event->event_x, event->event_y);
178  if (event->mode != XCB_NOTIFY_MODE_NORMAL) {
179  DLOG("This was not a normal notify, ignoring\n");
180  return;
181  }
182  /* Some events are not interesting, because they were not generated
183  * actively by the user, but by reconfiguration of windows */
184  if (event_is_ignored(event->sequence, XCB_ENTER_NOTIFY)) {
185  DLOG("Event ignored\n");
186  return;
187  }
188 
189  bool enter_child = false;
190  /* Get container by frame or by child window */
191  if ((con = con_by_frame_id(event->event)) == NULL) {
192  con = con_by_window_id(event->event);
193  enter_child = true;
194  }
195 
196  /* If not, then the user moved his cursor to the root window. In that case, we adjust c_ws */
197  if (con == NULL) {
198  DLOG("Getting screen at %d x %d\n", event->root_x, event->root_y);
199  check_crossing_screen_boundary(event->root_x, event->root_y);
200  return;
201  }
202 
203  if (con->parent->type == CT_DOCKAREA) {
204  DLOG("Ignoring, this is a dock client\n");
205  return;
206  }
207 
208  /* see if the user entered the window on a certain window decoration */
209  int layout = (enter_child ? con->parent->layout : con->layout);
210  if (layout == L_DEFAULT) {
211  Con *child;
212  TAILQ_FOREACH(child, &(con->nodes_head), nodes)
213  if (rect_contains(child->deco_rect, event->event_x, event->event_y)) {
214  LOG("using child %p / %s instead!\n", child, child->name);
215  con = child;
216  break;
217  }
218  }
219 
220 #if 0
221  if (client->workspace != c_ws && client->workspace->output == c_ws->output) {
222  /* This can happen when a client gets assigned to a different workspace than
223  * the current one (see src/mainx.c:reparent_window). Shortly after it was created,
224  * an enter_notify will follow. */
225  DLOG("enter_notify for a client on a different workspace but the same screen, ignoring\n");
226  return 1;
227  }
228 #endif
229 
231  return;
232 
233  /* Get the currently focused workspace to check if the focus change also
234  * involves changing workspaces. If so, we need to call workspace_show() to
235  * correctly update state and send the IPC event. */
236  Con *ws = con_get_workspace(con);
237  if (ws != con_get_workspace(focused))
238  workspace_show(ws);
239 
240  focused_id = XCB_NONE;
242  tree_render();
243 
244  return;
245 }
246 
247 /*
248  * When the user moves the mouse but does not change the active window
249  * (e.g. when having no windows opened but moving mouse on the root screen
250  * and crossing virtual screen boundaries), this callback gets called.
251  *
252  */
253 static void handle_motion_notify(xcb_motion_notify_event_t *event) {
254 
255  last_timestamp = event->time;
256 
257  /* Skip events where the pointer was over a child window, we are only
258  * interested in events on the root window. */
259  if (event->child != 0)
260  return;
261 
262  Con *con;
263  if ((con = con_by_frame_id(event->event)) == NULL) {
264  check_crossing_screen_boundary(event->root_x, event->root_y);
265  return;
266  }
267 
269  return;
270 
271  if (con->layout != L_DEFAULT)
272  return;
273 
274  /* see over which rect the user is */
275  Con *current;
276  TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
277  if (!rect_contains(current->deco_rect, event->event_x, event->event_y))
278  continue;
279 
280  /* We found the rect, let’s see if this window is focused */
281  if (TAILQ_FIRST(&(con->focus_head)) == current)
282  return;
283 
284  con_focus(current);
286  return;
287  }
288 
289  return;
290 }
291 
292 /*
293  * Called when the keyboard mapping changes (for example by using Xmodmap),
294  * we need to update our key bindings then (re-translate symbols).
295  *
296  */
297 static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
298  if (event->request != XCB_MAPPING_KEYBOARD &&
299  event->request != XCB_MAPPING_MODIFIER)
300  return;
301 
302  DLOG("Received mapping_notify for keyboard or modifier mapping, re-grabbing keys\n");
303  xcb_refresh_keyboard_mapping(keysyms, event);
304 
306 
309  grab_all_keys(conn, false);
310 
311  return;
312 }
313 
314 /*
315  * A new window appeared on the screen (=was mapped), so let’s manage it.
316  *
317  */
318 static void handle_map_request(xcb_map_request_event_t *event) {
319  xcb_get_window_attributes_cookie_t cookie;
320 
321  cookie = xcb_get_window_attributes_unchecked(conn, event->window);
322 
323  DLOG("window = 0x%08x, serial is %d.\n", event->window, event->sequence);
324  add_ignore_event(event->sequence, -1);
325 
326  manage_window(event->window, cookie, false);
328  return;
329 }
330 
331 /*
332  * Configure requests are received when the application wants to resize windows
333  * on their own.
334  *
335  * We generate a synthethic configure notify event to signalize the client its
336  * "new" position.
337  *
338  */
339 static void handle_configure_request(xcb_configure_request_event_t *event) {
340  Con *con;
341 
342  DLOG("window 0x%08x wants to be at %dx%d with %dx%d\n",
343  event->window, event->x, event->y, event->width, event->height);
344 
345  /* For unmanaged windows, we just execute the configure request. As soon as
346  * it gets mapped, we will take over anyways. */
347  if ((con = con_by_window_id(event->window)) == NULL) {
348  DLOG("Configure request for unmanaged window, can do that.\n");
349 
350  uint32_t mask = 0;
351  uint32_t values[7];
352  int c = 0;
353 #define COPY_MASK_MEMBER(mask_member, event_member) do { \
354  if (event->value_mask & mask_member) { \
355  mask |= mask_member; \
356  values[c++] = event->event_member; \
357  } \
358 } while (0)
359 
360  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_X, x);
361  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_Y, y);
362  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_WIDTH, width);
363  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_HEIGHT, height);
364  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_BORDER_WIDTH, border_width);
365  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_SIBLING, sibling);
366  COPY_MASK_MEMBER(XCB_CONFIG_WINDOW_STACK_MODE, stack_mode);
367 
368  xcb_configure_window(conn, event->window, mask, values);
369  xcb_flush(conn);
370 
371  return;
372  }
373 
374  DLOG("Configure request!\n");
375  if (con_is_floating(con) && con_is_leaf(con)) {
376  /* find the height for the decorations */
377  int deco_height = config.font.height + 5;
378  /* we actually need to apply the size/position changes to the *parent*
379  * container */
380  Rect bsr = con_border_style_rect(con);
381  if (con->border_style == BS_NORMAL) {
382  bsr.y += deco_height;
383  bsr.height -= deco_height;
384  }
385  Con *floatingcon = con->parent;
386 
387  Rect newrect = floatingcon->rect;
388 
389  if (event->value_mask & XCB_CONFIG_WINDOW_X) {
390  newrect.x = event->x + (-1) * bsr.x;
391  DLOG("proposed x = %d, new x is %d\n", event->x, newrect.x);
392  }
393  if (event->value_mask & XCB_CONFIG_WINDOW_Y) {
394  newrect.y = event->y + (-1) * bsr.y;
395  DLOG("proposed y = %d, new y is %d\n", event->y, newrect.y);
396  }
397  if (event->value_mask & XCB_CONFIG_WINDOW_WIDTH) {
398  newrect.width = event->width + (-1) * bsr.width;
399  newrect.width += con->border_width * 2;
400  DLOG("proposed width = %d, new width is %d (x11 border %d)\n",
401  event->width, newrect.width, con->border_width);
402  }
403  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
404  newrect.height = event->height + (-1) * bsr.height;
405  newrect.height += con->border_width * 2;
406  DLOG("proposed height = %d, new height is %d (x11 border %d)\n",
407  event->height, newrect.height, con->border_width);
408  }
409 
410  DLOG("Container is a floating leaf node, will do that.\n");
411  floating_reposition(floatingcon, newrect);
412  return;
413  }
414 
415  /* Dock windows can be reconfigured in their height */
416  if (con->parent && con->parent->type == CT_DOCKAREA) {
417  DLOG("Dock window, only height reconfiguration allowed\n");
418  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
419  DLOG("Height given, changing\n");
420 
421  con->geometry.height = event->height;
422  tree_render();
423  }
424  }
425 
427 
428  return;
429 }
430 #if 0
431 
432 /*
433  * Configuration notifies are only handled because we need to set up ignore for
434  * the following enter notify events.
435  *
436  */
437 int handle_configure_event(void *prophs, xcb_connection_t *conn, xcb_configure_notify_event_t *event) {
438  DLOG("configure_event, sequence %d\n", event->sequence);
439  /* We ignore this sequence twice because events for child and frame should be ignored */
440  add_ignore_event(event->sequence);
441  add_ignore_event(event->sequence);
442 
443  return 1;
444 }
445 #endif
446 
447 /*
448  * Gets triggered upon a RandR screen change event, that is when the user
449  * changes the screen configuration in any way (mode, position, …)
450  *
451  */
452 static void handle_screen_change(xcb_generic_event_t *e) {
453  DLOG("RandR screen change\n");
454 
456 
457  ipc_send_event("output", I3_IPC_EVENT_OUTPUT, "{\"change\":\"unspecified\"}");
458 
459  return;
460 }
461 
462 /*
463  * Our window decorations were unmapped. That means, the window will be killed
464  * now, so we better clean up before.
465  *
466  */
467 static void handle_unmap_notify_event(xcb_unmap_notify_event_t *event) {
468  DLOG("UnmapNotify for 0x%08x (received from 0x%08x), serial %d\n", event->window, event->event, event->sequence);
469  xcb_get_input_focus_cookie_t cookie;
470  Con *con = con_by_window_id(event->window);
471  if (con == NULL) {
472  /* This could also be an UnmapNotify for the frame. We need to
473  * decrement the ignore_unmap counter. */
474  con = con_by_frame_id(event->window);
475  if (con == NULL) {
476  LOG("Not a managed window, ignoring UnmapNotify event\n");
477  return;
478  }
479 
480  if (con->ignore_unmap > 0)
481  con->ignore_unmap--;
482  /* See the end of this function. */
483  cookie = xcb_get_input_focus(conn);
484  DLOG("ignore_unmap = %d for frame of container %p\n", con->ignore_unmap, con);
485  goto ignore_end;
486  }
487 
488  /* See the end of this function. */
489  cookie = xcb_get_input_focus(conn);
490 
491  if (con->ignore_unmap > 0) {
492  DLOG("ignore_unmap = %d, dec\n", con->ignore_unmap);
493  con->ignore_unmap--;
494  goto ignore_end;
495  }
496 
497  tree_close(con, DONT_KILL_WINDOW, false, false);
498  tree_render();
500 
501 ignore_end:
502  /* If the client (as opposed to i3) destroyed or unmapped a window, an
503  * EnterNotify event will follow (indistinguishable from an EnterNotify
504  * event caused by moving your mouse), causing i3 to set focus to whichever
505  * window is now visible.
506  *
507  * In a complex stacked or tabbed layout (take two v-split containers in a
508  * tabbed container), when the bottom window in tab2 is closed, the bottom
509  * window of tab1 is visible instead. X11 will thus send an EnterNotify
510  * event for the bottom window of tab1, while the focus should be set to
511  * the remaining window of tab2.
512  *
513  * Therefore, we ignore all EnterNotify events which have the same sequence
514  * as an UnmapNotify event. */
515  add_ignore_event(event->sequence, XCB_ENTER_NOTIFY);
516 
517  /* Since we just ignored the sequence of this UnmapNotify, we want to make
518  * sure that following events use a different sequence. When putting xterm
519  * into fullscreen and moving the pointer to a different window, without
520  * using GetInputFocus, subsequent (legitimate) EnterNotify events arrived
521  * with the same sequence and thus were ignored (see ticket #609). */
522  free(xcb_get_input_focus_reply(conn, cookie, NULL));
523 }
524 
525 /*
526  * A destroy notify event is sent when the window is not unmapped, but
527  * immediately destroyed (for example when starting a window and immediately
528  * killing the program which started it).
529  *
530  * We just pass on the event to the unmap notify handler (by copying the
531  * important fields in the event data structure).
532  *
533  */
534 static void handle_destroy_notify_event(xcb_destroy_notify_event_t *event) {
535  DLOG("destroy notify for 0x%08x, 0x%08x\n", event->event, event->window);
536 
537  xcb_unmap_notify_event_t unmap;
538  unmap.sequence = event->sequence;
539  unmap.event = event->event;
540  unmap.window = event->window;
541 
543 }
544 
545 /*
546  * Called when a window changes its title
547  *
548  */
549 static bool handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
550  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
551  Con *con;
552  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
553  return false;
554 
555  window_update_name(con->window, prop, false);
556 
558 
559  return true;
560 }
561 
562 /*
563  * Handles legacy window name updates (WM_NAME), see also src/window.c,
564  * window_update_name_legacy().
565  *
566  */
567 static bool handle_windowname_change_legacy(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 false;
572 
573  window_update_name_legacy(con->window, prop, false);
574 
576 
577  return true;
578 }
579 
580 /*
581  * Called when a window changes its WM_WINDOW_ROLE.
582  *
583  */
584 static bool handle_windowrole_change(void *data, xcb_connection_t *conn, uint8_t state,
585  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
586  Con *con;
587  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
588  return false;
589 
590  window_update_role(con->window, prop, false);
591 
592  return true;
593 }
594 
595 #if 0
596 /*
597  * Updates the client’s WM_CLASS property
598  *
599  */
600 static int handle_windowclass_change(void *data, xcb_connection_t *conn, uint8_t state,
601  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
602  Con *con;
603  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
604  return 1;
605 
606  window_update_class(con->window, prop, false);
607 
608  return 0;
609 }
610 #endif
611 
612 /*
613  * Expose event means we should redraw our windows (= title bar)
614  *
615  */
616 static void handle_expose_event(xcb_expose_event_t *event) {
617  Con *parent;
618 
619  DLOG("window = %08x\n", event->window);
620 
621  if ((parent = con_by_frame_id(event->window)) == NULL) {
622  LOG("expose event for unknown window, ignoring\n");
623  return;
624  }
625 
626  /* Since we render to our pixmap on every change anyways, expose events
627  * only tell us that the X server lost (parts of) the window contents. We
628  * can handle that by copying the appropriate part from our pixmap to the
629  * window. */
630  xcb_copy_area(conn, parent->pixmap, parent->frame, parent->pm_gc,
631  event->x, event->y, event->x, event->y,
632  event->width, event->height);
633  xcb_flush(conn);
634 
635  return;
636 }
637 
638 /*
639  * Handle client messages (EWMH)
640  *
641  */
642 static void handle_client_message(xcb_client_message_event_t *event) {
643  /* If this is a startup notification ClientMessage, the library will handle
644  * it and call our monitor_event() callback. */
645  if (sn_xcb_display_process_event(sndisplay, (xcb_generic_event_t*)event))
646  return;
647 
648  LOG("ClientMessage for window 0x%08x\n", event->window);
649  if (event->type == A__NET_WM_STATE) {
650  if (event->format != 32 || event->data.data32[1] != A__NET_WM_STATE_FULLSCREEN) {
651  DLOG("atom in clientmessage is %d, fullscreen is %d\n",
652  event->data.data32[1], A__NET_WM_STATE_FULLSCREEN);
653  DLOG("not about fullscreen atom\n");
654  return;
655  }
656 
657  Con *con = con_by_window_id(event->window);
658  if (con == NULL) {
659  DLOG("Could not get window for client message\n");
660  return;
661  }
662 
663  /* Check if the fullscreen state should be toggled */
664  if ((con->fullscreen_mode != CF_NONE &&
665  (event->data.data32[0] == _NET_WM_STATE_REMOVE ||
666  event->data.data32[0] == _NET_WM_STATE_TOGGLE)) ||
667  (con->fullscreen_mode == CF_NONE &&
668  (event->data.data32[0] == _NET_WM_STATE_ADD ||
669  event->data.data32[0] == _NET_WM_STATE_TOGGLE))) {
670  DLOG("toggling fullscreen\n");
671  con_toggle_fullscreen(con, CF_OUTPUT);
672  }
673 
674  tree_render();
676  } else if (event->type == A_I3_SYNC) {
677  DLOG("i3 sync, yay\n");
678  xcb_window_t window = event->data.data32[0];
679  uint32_t rnd = event->data.data32[1];
680  DLOG("Sending random value %d back to X11 window 0x%08x\n", rnd, window);
681 
682  void *reply = scalloc(32);
683  xcb_client_message_event_t *ev = reply;
684 
685  ev->response_type = XCB_CLIENT_MESSAGE;
686  ev->window = window;
687  ev->type = A_I3_SYNC;
688  ev->format = 32;
689  ev->data.data32[0] = window;
690  ev->data.data32[1] = rnd;
691 
692  xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
693  xcb_flush(conn);
694  free(reply);
695  } else {
696  DLOG("unhandled clientmessage\n");
697  return;
698  }
699 }
700 
701 #if 0
702 int handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
703  xcb_atom_t atom, xcb_get_property_reply_t *property) {
704  /* TODO: Implement this one. To do this, implement a little test program which sleep(1)s
705  before changing this property. */
706  ELOG("_NET_WM_WINDOW_TYPE changed, this is not yet implemented.\n");
707  return 0;
708 }
709 #endif
710 
711 /*
712  * Handles the size hints set by a window, but currently only the part necessary for displaying
713  * clients proportionally inside their frames (mplayer for example)
714  *
715  * See ICCCM 4.1.2.3 for more details
716  *
717  */
718 static bool handle_normal_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
719  xcb_atom_t name, xcb_get_property_reply_t *reply) {
720  Con *con = con_by_window_id(window);
721  if (con == NULL) {
722  DLOG("Received WM_NORMAL_HINTS for unknown client\n");
723  return false;
724  }
725 
726  xcb_size_hints_t size_hints;
727 
728  //CLIENT_LOG(client);
729 
730  /* If the hints were already in this event, use them, if not, request them */
731  if (reply != NULL)
732  xcb_icccm_get_wm_size_hints_from_reply(&size_hints, reply);
733  else
735 
736  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE)) {
737  // TODO: Minimum size is not yet implemented
738  DLOG("Minimum size: %d (width) x %d (height)\n", size_hints.min_width, size_hints.min_height);
739  }
740 
741  bool changed = false;
742  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_RESIZE_INC)) {
743  if (size_hints.width_inc > 0 && size_hints.width_inc < 0xFFFF)
744  if (con->width_increment != size_hints.width_inc) {
745  con->width_increment = size_hints.width_inc;
746  changed = true;
747  }
748  if (size_hints.height_inc > 0 && size_hints.height_inc < 0xFFFF)
749  if (con->height_increment != size_hints.height_inc) {
750  con->height_increment = size_hints.height_inc;
751  changed = true;
752  }
753 
754  if (changed)
755  DLOG("resize increments changed\n");
756  }
757 
758  int base_width = 0, base_height = 0;
759 
760  /* base_width/height are the desired size of the window.
761  We check if either the program-specified size or the program-specified
762  min-size is available */
763  if (size_hints.flags & XCB_ICCCM_SIZE_HINT_BASE_SIZE) {
764  base_width = size_hints.base_width;
765  base_height = size_hints.base_height;
766  } else if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE) {
767  /* TODO: is this right? icccm says not */
768  base_width = size_hints.min_width;
769  base_height = size_hints.min_height;
770  }
771 
772  if (base_width != con->base_width ||
773  base_height != con->base_height) {
774  con->base_width = base_width;
775  con->base_height = base_height;
776  DLOG("client's base_height changed to %d\n", base_height);
777  DLOG("client's base_width changed to %d\n", base_width);
778  changed = true;
779  }
780 
781  /* If no aspect ratio was set or if it was invalid, we ignore the hints */
782  if (!(size_hints.flags & XCB_ICCCM_SIZE_HINT_P_ASPECT) ||
783  (size_hints.min_aspect_num <= 0) ||
784  (size_hints.min_aspect_den <= 0)) {
785  goto render_and_return;
786  }
787 
788  /* XXX: do we really use rect here, not window_rect? */
789  double width = con->rect.width - base_width;
790  double height = con->rect.height - base_height;
791  /* Convert numerator/denominator to a double */
792  double min_aspect = (double)size_hints.min_aspect_num / size_hints.min_aspect_den;
793  double max_aspect = (double)size_hints.max_aspect_num / size_hints.min_aspect_den;
794 
795  DLOG("Aspect ratio set: minimum %f, maximum %f\n", min_aspect, max_aspect);
796  DLOG("width = %f, height = %f\n", width, height);
797 
798  /* Sanity checks, this is user-input, in a way */
799  if (max_aspect <= 0 || min_aspect <= 0 || height == 0 || (width / height) <= 0)
800  goto render_and_return;
801 
802  /* Check if we need to set proportional_* variables using the correct ratio */
803  if ((width / height) < min_aspect) {
804  if (con->proportional_width != width ||
805  con->proportional_height != (width / min_aspect)) {
806  con->proportional_width = width;
807  con->proportional_height = width / min_aspect;
808  changed = true;
809  }
810  } else if ((width / height) > max_aspect) {
811  if (con->proportional_width != width ||
812  con->proportional_height != (width / max_aspect)) {
813  con->proportional_width = width;
814  con->proportional_height = width / max_aspect;
815  changed = true;
816  }
817  } else goto render_and_return;
818 
819 render_and_return:
820  if (changed)
821  tree_render();
822  FREE(reply);
823  return true;
824 }
825 
826 /*
827  * Handles the WM_HINTS property for extracting the urgency state of the window.
828  *
829  */
830 static bool handle_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
831  xcb_atom_t name, xcb_get_property_reply_t *reply) {
832  Con *con = con_by_window_id(window);
833  if (con == NULL) {
834  DLOG("Received WM_HINTS for unknown client\n");
835  return false;
836  }
837 
838  xcb_icccm_wm_hints_t hints;
839 
840  if (reply == NULL)
841  if (!(reply = xcb_get_property_reply(conn, xcb_icccm_get_wm_hints(conn, window), NULL)))
842  return false;
843 
844  if (!xcb_icccm_get_wm_hints_from_reply(&hints, reply))
845  return false;
846 
847  if (!con->urgent && focused == con) {
848  DLOG("Ignoring urgency flag for current client\n");
849  con->window->urgent.tv_sec = 0;
850  con->window->urgent.tv_usec = 0;
851  goto end;
852  }
853 
854  /* Update the flag on the client directly */
855  con->urgent = (xcb_icccm_wm_hints_get_urgency(&hints) != 0);
856  //CLIENT_LOG(con);
857  if (con->window) {
858  if (con->urgent) {
859  gettimeofday(&con->window->urgent, NULL);
860  } else {
861  con->window->urgent.tv_sec = 0;
862  con->window->urgent.tv_usec = 0;
863  }
864  }
865  LOG("Urgency flag changed to %d\n", con->urgent);
866 
867  Con *ws;
868  /* Set the urgency flag on the workspace, if a workspace could be found
869  * (for dock clients, that is not the case). */
870  if ((ws = con_get_workspace(con)) != NULL)
872 
873  tree_render();
874 
875 end:
876  if (con->window)
877  window_update_hints(con->window, reply);
878  else free(reply);
879  return true;
880 }
881 
882 /*
883  * Handles the transient for hints set by a window, signalizing that this window is a popup window
884  * for some other window.
885  *
886  * See ICCCM 4.1.2.6 for more details
887  *
888  */
889 static bool handle_transient_for(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
890  xcb_atom_t name, xcb_get_property_reply_t *prop) {
891  Con *con;
892 
893  if ((con = con_by_window_id(window)) == NULL || con->window == NULL) {
894  DLOG("No such window\n");
895  return false;
896  }
897 
898  if (prop == NULL) {
899  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
900  false, window, XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 0, 32), NULL);
901  if (prop == NULL)
902  return false;
903  }
904 
906 
907  return true;
908 }
909 
910 /*
911  * Handles changes of the WM_CLIENT_LEADER atom which specifies if this is a
912  * toolwindow (or similar) and to which window it belongs (logical parent).
913  *
914  */
915 static bool handle_clientleader_change(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
916  xcb_atom_t name, xcb_get_property_reply_t *prop) {
917  Con *con;
918  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
919  return false;
920 
921  if (prop == NULL) {
922  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
923  false, window, A_WM_CLIENT_LEADER, XCB_ATOM_WINDOW, 0, 32), NULL);
924  if (prop == NULL)
925  return false;
926  }
927 
928  window_update_leader(con->window, prop);
929 
930  return true;
931 }
932 
933 /*
934  * Handles FocusIn events which are generated by clients (i3’s focus changes
935  * don’t generate FocusIn events due to a different EventMask) and updates the
936  * decorations accordingly.
937  *
938  */
939 static void handle_focus_in(xcb_focus_in_event_t *event) {
940  DLOG("focus change in, for window 0x%08x\n", event->event);
941  Con *con;
942  if ((con = con_by_window_id(event->event)) == NULL || con->window == NULL)
943  return;
944  DLOG("That is con %p / %s\n", con, con->name);
945 
946  if (event->mode == XCB_NOTIFY_MODE_GRAB ||
947  event->mode == XCB_NOTIFY_MODE_UNGRAB) {
948  DLOG("FocusIn event for grab/ungrab, ignoring\n");
949  return;
950  }
951 
952  if (event->detail == XCB_NOTIFY_DETAIL_POINTER) {
953  DLOG("notify detail is pointer, ignoring this event\n");
954  return;
955  }
956 
957  if (focused_id == event->event) {
958  DLOG("focus matches the currently focused window, not doing anything\n");
959  return;
960  }
961 
962  /* Skip dock clients, they cannot get the i3 focus. */
963  if (con->parent->type == CT_DOCKAREA) {
964  DLOG("This is a dock client, not focusing.\n");
965  return;
966  }
967 
968  DLOG("focus is different, updating decorations\n");
969 
970  /* Get the currently focused workspace to check if the focus change also
971  * involves changing workspaces. If so, we need to call workspace_show() to
972  * correctly update state and send the IPC event. */
973  Con *ws = con_get_workspace(con);
974  if (ws != con_get_workspace(focused))
975  workspace_show(ws);
976 
977  con_focus(con);
978  /* We update focused_id because we don’t need to set focus again */
979  focused_id = event->event;
981  return;
982 }
983 
984 /* Returns false if the event could not be processed (e.g. the window could not
985  * be found), true otherwise */
986 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);
987 
989  xcb_atom_t atom;
990  uint32_t long_len;
992 };
993 
995  { 0, 128, handle_windowname_change },
996  { 0, UINT_MAX, handle_hints },
998  { 0, UINT_MAX, handle_normal_hints },
999  { 0, UINT_MAX, handle_clientleader_change },
1000  { 0, UINT_MAX, handle_transient_for },
1001  { 0, 128, handle_windowrole_change }
1002 };
1003 #define NUM_HANDLERS (sizeof(property_handlers) / sizeof(struct property_handler_t))
1004 
1005 /*
1006  * Sets the appropriate atoms for the property handlers after the atoms were
1007  * received from X11
1008  *
1009  */
1011 
1012  sn_monitor_context_new(sndisplay, conn_screen, startup_monitor_event, NULL, NULL);
1013 
1014  property_handlers[0].atom = A__NET_WM_NAME;
1015  property_handlers[1].atom = XCB_ATOM_WM_HINTS;
1016  property_handlers[2].atom = XCB_ATOM_WM_NAME;
1017  property_handlers[3].atom = XCB_ATOM_WM_NORMAL_HINTS;
1018  property_handlers[4].atom = A_WM_CLIENT_LEADER;
1019  property_handlers[5].atom = XCB_ATOM_WM_TRANSIENT_FOR;
1020  property_handlers[6].atom = A_WM_WINDOW_ROLE;
1021 }
1022 
1023 static void property_notify(uint8_t state, xcb_window_t window, xcb_atom_t atom) {
1024  struct property_handler_t *handler = NULL;
1025  xcb_get_property_reply_t *propr = NULL;
1026 
1027  for (int c = 0; c < sizeof(property_handlers) / sizeof(struct property_handler_t); c++) {
1028  if (property_handlers[c].atom != atom)
1029  continue;
1030 
1031  handler = &property_handlers[c];
1032  break;
1033  }
1034 
1035  if (handler == NULL) {
1036  //DLOG("Unhandled property notify for atom %d (0x%08x)\n", atom, atom);
1037  return;
1038  }
1039 
1040  if (state != XCB_PROPERTY_DELETE) {
1041  xcb_get_property_cookie_t cookie = xcb_get_property(conn, 0, window, atom, XCB_GET_PROPERTY_TYPE_ANY, 0, handler->long_len);
1042  propr = xcb_get_property_reply(conn, cookie, 0);
1043  }
1044 
1045  /* the handler will free() the reply unless it returns false */
1046  if (!handler->cb(NULL, conn, state, window, atom, propr))
1047  FREE(propr);
1048 }
1049 
1050 /*
1051  * Takes an xcb_generic_event_t and calls the appropriate handler, based on the
1052  * event type.
1053  *
1054  */
1055 void handle_event(int type, xcb_generic_event_t *event) {
1056  if (randr_base > -1 &&
1057  type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) {
1058  handle_screen_change(event);
1059  return;
1060  }
1061 
1062  switch (type) {
1063  case XCB_KEY_PRESS:
1064  handle_key_press((xcb_key_press_event_t*)event);
1065  break;
1066 
1067  case XCB_BUTTON_PRESS:
1068  handle_button_press((xcb_button_press_event_t*)event);
1069  break;
1070 
1071  case XCB_MAP_REQUEST:
1072  handle_map_request((xcb_map_request_event_t*)event);
1073  break;
1074 
1075  case XCB_UNMAP_NOTIFY:
1076  handle_unmap_notify_event((xcb_unmap_notify_event_t*)event);
1077  break;
1078 
1079  case XCB_DESTROY_NOTIFY:
1080  handle_destroy_notify_event((xcb_destroy_notify_event_t*)event);
1081  break;
1082 
1083  case XCB_EXPOSE:
1084  handle_expose_event((xcb_expose_event_t*)event);
1085  break;
1086 
1087  case XCB_MOTION_NOTIFY:
1088  handle_motion_notify((xcb_motion_notify_event_t*)event);
1089  break;
1090 
1091  /* Enter window = user moved his mouse over the window */
1092  case XCB_ENTER_NOTIFY:
1093  handle_enter_notify((xcb_enter_notify_event_t*)event);
1094  break;
1095 
1096  /* Client message are sent to the root window. The only interesting
1097  * client message for us is _NET_WM_STATE, we honour
1098  * _NET_WM_STATE_FULLSCREEN */
1099  case XCB_CLIENT_MESSAGE:
1100  handle_client_message((xcb_client_message_event_t*)event);
1101  break;
1102 
1103  /* Configure request = window tried to change size on its own */
1104  case XCB_CONFIGURE_REQUEST:
1105  handle_configure_request((xcb_configure_request_event_t*)event);
1106  break;
1107 
1108  /* Mapping notify = keyboard mapping changed (Xmodmap), re-grab bindings */
1109  case XCB_MAPPING_NOTIFY:
1110  handle_mapping_notify((xcb_mapping_notify_event_t*)event);
1111  break;
1112 
1113  case XCB_FOCUS_IN:
1114  handle_focus_in((xcb_focus_in_event_t*)event);
1115  break;
1116 
1117  case XCB_PROPERTY_NOTIFY: {
1118  xcb_property_notify_event_t *e = (xcb_property_notify_event_t*)event;
1119  last_timestamp = e->time;
1120  property_notify(e->state, e->window, e->atom);
1121  break;
1122  }
1123 
1124  default:
1125  //DLOG("Unhandled event of type %d\n", type);
1126  break;
1127  }
1128 }