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  layout_t 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 = con->deco_rect.height;
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  if (strcmp(con_get_workspace(floatingcon)->name, "__i3_scratch") == 0) {
353  DLOG("This is a scratchpad container, ignoring ConfigureRequest\n");
354  return;
355  }
356 
357  Rect newrect = floatingcon->rect;
358 
359  if (event->value_mask & XCB_CONFIG_WINDOW_X) {
360  newrect.x = event->x + (-1) * bsr.x;
361  DLOG("proposed x = %d, new x is %d\n", event->x, newrect.x);
362  }
363  if (event->value_mask & XCB_CONFIG_WINDOW_Y) {
364  newrect.y = event->y + (-1) * bsr.y;
365  DLOG("proposed y = %d, new y is %d\n", event->y, newrect.y);
366  }
367  if (event->value_mask & XCB_CONFIG_WINDOW_WIDTH) {
368  newrect.width = event->width + (-1) * bsr.width;
369  newrect.width += con->border_width * 2;
370  DLOG("proposed width = %d, new width is %d (x11 border %d)\n",
371  event->width, newrect.width, con->border_width);
372  }
373  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
374  newrect.height = event->height + (-1) * bsr.height;
375  newrect.height += con->border_width * 2;
376  DLOG("proposed height = %d, new height is %d (x11 border %d)\n",
377  event->height, newrect.height, con->border_width);
378  }
379 
380  DLOG("Container is a floating leaf node, will do that.\n");
381  floating_reposition(floatingcon, newrect);
382  return;
383  }
384 
385  /* Dock windows can be reconfigured in their height */
386  if (con->parent && con->parent->type == CT_DOCKAREA) {
387  DLOG("Dock window, only height reconfiguration allowed\n");
388  if (event->value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
389  DLOG("Height given, changing\n");
390 
391  con->geometry.height = event->height;
392  tree_render();
393  }
394  }
395 
397 
398  return;
399 }
400 #if 0
401 
402 /*
403  * Configuration notifies are only handled because we need to set up ignore for
404  * the following enter notify events.
405  *
406  */
407 int handle_configure_event(void *prophs, xcb_connection_t *conn, xcb_configure_notify_event_t *event) {
408  DLOG("configure_event, sequence %d\n", event->sequence);
409  /* We ignore this sequence twice because events for child and frame should be ignored */
410  add_ignore_event(event->sequence);
411  add_ignore_event(event->sequence);
412 
413  return 1;
414 }
415 #endif
416 
417 /*
418  * Gets triggered upon a RandR screen change event, that is when the user
419  * changes the screen configuration in any way (mode, position, …)
420  *
421  */
422 static void handle_screen_change(xcb_generic_event_t *e) {
423  DLOG("RandR screen change\n");
424 
426 
428 
429  ipc_send_event("output", I3_IPC_EVENT_OUTPUT, "{\"change\":\"unspecified\"}");
430 
431  return;
432 }
433 
434 /*
435  * Our window decorations were unmapped. That means, the window will be killed
436  * now, so we better clean up before.
437  *
438  */
439 static void handle_unmap_notify_event(xcb_unmap_notify_event_t *event) {
440  DLOG("UnmapNotify for 0x%08x (received from 0x%08x), serial %d\n", event->window, event->event, event->sequence);
441  xcb_get_input_focus_cookie_t cookie;
442  Con *con = con_by_window_id(event->window);
443  if (con == NULL) {
444  /* This could also be an UnmapNotify for the frame. We need to
445  * decrement the ignore_unmap counter. */
446  con = con_by_frame_id(event->window);
447  if (con == NULL) {
448  LOG("Not a managed window, ignoring UnmapNotify event\n");
449  return;
450  }
451 
452  if (con->ignore_unmap > 0)
453  con->ignore_unmap--;
454  /* See the end of this function. */
455  cookie = xcb_get_input_focus(conn);
456  DLOG("ignore_unmap = %d for frame of container %p\n", con->ignore_unmap, con);
457  goto ignore_end;
458  }
459 
460  /* See the end of this function. */
461  cookie = xcb_get_input_focus(conn);
462 
463  if (con->ignore_unmap > 0) {
464  DLOG("ignore_unmap = %d, dec\n", con->ignore_unmap);
465  con->ignore_unmap--;
466  goto ignore_end;
467  }
468 
469  tree_close(con, DONT_KILL_WINDOW, false, false);
470  tree_render();
472 
473 ignore_end:
474  /* If the client (as opposed to i3) destroyed or unmapped a window, an
475  * EnterNotify event will follow (indistinguishable from an EnterNotify
476  * event caused by moving your mouse), causing i3 to set focus to whichever
477  * window is now visible.
478  *
479  * In a complex stacked or tabbed layout (take two v-split containers in a
480  * tabbed container), when the bottom window in tab2 is closed, the bottom
481  * window of tab1 is visible instead. X11 will thus send an EnterNotify
482  * event for the bottom window of tab1, while the focus should be set to
483  * the remaining window of tab2.
484  *
485  * Therefore, we ignore all EnterNotify events which have the same sequence
486  * as an UnmapNotify event. */
487  add_ignore_event(event->sequence, XCB_ENTER_NOTIFY);
488 
489  /* Since we just ignored the sequence of this UnmapNotify, we want to make
490  * sure that following events use a different sequence. When putting xterm
491  * into fullscreen and moving the pointer to a different window, without
492  * using GetInputFocus, subsequent (legitimate) EnterNotify events arrived
493  * with the same sequence and thus were ignored (see ticket #609). */
494  free(xcb_get_input_focus_reply(conn, cookie, NULL));
495 }
496 
497 /*
498  * A destroy notify event is sent when the window is not unmapped, but
499  * immediately destroyed (for example when starting a window and immediately
500  * killing the program which started it).
501  *
502  * We just pass on the event to the unmap notify handler (by copying the
503  * important fields in the event data structure).
504  *
505  */
506 static void handle_destroy_notify_event(xcb_destroy_notify_event_t *event) {
507  DLOG("destroy notify for 0x%08x, 0x%08x\n", event->event, event->window);
508 
509  xcb_unmap_notify_event_t unmap;
510  unmap.sequence = event->sequence;
511  unmap.event = event->event;
512  unmap.window = event->window;
513 
515 }
516 
517 /*
518  * Called when a window changes its title
519  *
520  */
521 static bool handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
522  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
523  Con *con;
524  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
525  return false;
526 
527  window_update_name(con->window, prop, false);
528 
530 
531  return true;
532 }
533 
534 /*
535  * Handles legacy window name updates (WM_NAME), see also src/window.c,
536  * window_update_name_legacy().
537  *
538  */
539 static bool handle_windowname_change_legacy(void *data, xcb_connection_t *conn, uint8_t state,
540  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
541  Con *con;
542  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
543  return false;
544 
545  window_update_name_legacy(con->window, prop, false);
546 
548 
549  return true;
550 }
551 
552 /*
553  * Called when a window changes its WM_WINDOW_ROLE.
554  *
555  */
556 static bool handle_windowrole_change(void *data, xcb_connection_t *conn, uint8_t state,
557  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
558  Con *con;
559  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
560  return false;
561 
562  window_update_role(con->window, prop, false);
563 
564  return true;
565 }
566 
567 #if 0
568 /*
569  * Updates the client’s WM_CLASS property
570  *
571  */
572 static int handle_windowclass_change(void *data, xcb_connection_t *conn, uint8_t state,
573  xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
574  Con *con;
575  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
576  return 1;
577 
578  window_update_class(con->window, prop, false);
579 
580  return 0;
581 }
582 #endif
583 
584 /*
585  * Expose event means we should redraw our windows (= title bar)
586  *
587  */
588 static void handle_expose_event(xcb_expose_event_t *event) {
589  Con *parent;
590 
591  DLOG("window = %08x\n", event->window);
592 
593  if ((parent = con_by_frame_id(event->window)) == NULL) {
594  LOG("expose event for unknown window, ignoring\n");
595  return;
596  }
597 
598  /* Since we render to our pixmap on every change anyways, expose events
599  * only tell us that the X server lost (parts of) the window contents. We
600  * can handle that by copying the appropriate part from our pixmap to the
601  * window. */
602  xcb_copy_area(conn, parent->pixmap, parent->frame, parent->pm_gc,
603  event->x, event->y, event->x, event->y,
604  event->width, event->height);
605  xcb_flush(conn);
606 
607  return;
608 }
609 
610 /*
611  * Handle client messages (EWMH)
612  *
613  */
614 static void handle_client_message(xcb_client_message_event_t *event) {
615  /* If this is a startup notification ClientMessage, the library will handle
616  * it and call our monitor_event() callback. */
617  if (sn_xcb_display_process_event(sndisplay, (xcb_generic_event_t*)event))
618  return;
619 
620  LOG("ClientMessage for window 0x%08x\n", event->window);
621  if (event->type == A__NET_WM_STATE) {
622  if (event->format != 32 ||
623  (event->data.data32[1] != A__NET_WM_STATE_FULLSCREEN &&
624  event->data.data32[1] != A__NET_WM_STATE_DEMANDS_ATTENTION)) {
625  DLOG("Unknown atom in clientmessage of type %d\n", event->data.data32[1]);
626  return;
627  }
628 
629  Con *con = con_by_window_id(event->window);
630  if (con == NULL) {
631  DLOG("Could not get window for client message\n");
632  return;
633  }
634 
635  if (event->data.data32[1] == A__NET_WM_STATE_FULLSCREEN) {
636  /* Check if the fullscreen state should be toggled */
637  if ((con->fullscreen_mode != CF_NONE &&
638  (event->data.data32[0] == _NET_WM_STATE_REMOVE ||
639  event->data.data32[0] == _NET_WM_STATE_TOGGLE)) ||
640  (con->fullscreen_mode == CF_NONE &&
641  (event->data.data32[0] == _NET_WM_STATE_ADD ||
642  event->data.data32[0] == _NET_WM_STATE_TOGGLE))) {
643  DLOG("toggling fullscreen\n");
644  con_toggle_fullscreen(con, CF_OUTPUT);
645  }
646  } else if (event->data.data32[1] == A__NET_WM_STATE_DEMANDS_ATTENTION) {
647  /* Check if the urgent flag must be set or not */
648  if (event->data.data32[0] == _NET_WM_STATE_ADD)
649  con_set_urgency(con, true);
650  else if (event->data.data32[0] == _NET_WM_STATE_REMOVE)
651  con_set_urgency(con, false);
652  else if (event->data.data32[0] == _NET_WM_STATE_TOGGLE)
653  con_set_urgency(con, !con->urgent);
654  }
655 
656  tree_render();
657  } else if (event->type == A__NET_ACTIVE_WINDOW) {
658  DLOG("_NET_ACTIVE_WINDOW: Window 0x%08x should be activated\n", event->window);
659  Con *con = con_by_window_id(event->window);
660  if (con == NULL) {
661  DLOG("Could not get window for client message\n");
662  return;
663  }
664 
665  Con *ws = con_get_workspace(con);
666  if (!workspace_is_visible(ws)) {
667  DLOG("Workspace not visible, ignoring _NET_ACTIVE_WINDOW\n");
668  return;
669  }
670 
671  if (ws != con_get_workspace(focused))
672  workspace_show(ws);
673 
674  con_focus(con);
675  tree_render();
676  } else if (event->type == A_I3_SYNC) {
677  xcb_window_t window = event->data.data32[0];
678  uint32_t rnd = event->data.data32[1];
679  DLOG("[i3 sync protocol] Sending random value %d back to X11 window 0x%08x\n", rnd, window);
680 
681  void *reply = scalloc(32);
682  xcb_client_message_event_t *ev = reply;
683 
684  ev->response_type = XCB_CLIENT_MESSAGE;
685  ev->window = window;
686  ev->type = A_I3_SYNC;
687  ev->format = 32;
688  ev->data.data32[0] = window;
689  ev->data.data32[1] = rnd;
690 
691  xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
692  xcb_flush(conn);
693  free(reply);
694  } else if (event->type == A__NET_REQUEST_FRAME_EXTENTS) {
695  // A client can request an estimate for the frame size which the window
696  // manager will put around it before actually mapping its window. Java
697  // does this (as of openjdk-7).
698  //
699  // Note that the calculation below is not entirely accurate — once you
700  // set a different border type, it’s off. We _could_ request all the
701  // window properties (which have to be set up at this point according
702  // to EWMH), but that seems rather elaborate. The standard explicitly
703  // says the application must cope with an estimate that is not entirely
704  // accurate.
705  DLOG("_NET_REQUEST_FRAME_EXTENTS for window 0x%08x\n", event->window);
706  xcb_get_geometry_reply_t *geometry;
707  xcb_get_geometry_cookie_t cookie = xcb_get_geometry(conn, event->window);
708 
709  if (!(geometry = xcb_get_geometry_reply(conn, cookie, NULL))) {
710  ELOG("Could not get geometry of X11 window 0x%08x while handling "
711  "the _NET_REQUEST_FRAME_EXTENTS ClientMessage\n",
712  event->window);
713  return;
714  }
715 
716  DLOG("Current geometry = x=%d, y=%d, width=%d, height=%d\n",
717  geometry->x, geometry->y, geometry->width, geometry->height);
718 
719  Rect r = {
720  0, // left
721  geometry->width + 4, // right
722  0, // top
723  geometry->height + config.font.height + 5, // bottom
724  };
725  xcb_change_property(
726  conn,
727  XCB_PROP_MODE_REPLACE,
728  event->window,
729  A__NET_FRAME_EXTENTS,
730  XCB_ATOM_CARDINAL, 32, 4,
731  &r);
732  xcb_flush(conn);
733  } else {
734  DLOG("unhandled clientmessage\n");
735  return;
736  }
737 }
738 
739 #if 0
740 int handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
741  xcb_atom_t atom, xcb_get_property_reply_t *property) {
742  /* TODO: Implement this one. To do this, implement a little test program which sleep(1)s
743  before changing this property. */
744  ELOG("_NET_WM_WINDOW_TYPE changed, this is not yet implemented.\n");
745  return 0;
746 }
747 #endif
748 
749 /*
750  * Handles the size hints set by a window, but currently only the part necessary for displaying
751  * clients proportionally inside their frames (mplayer for example)
752  *
753  * See ICCCM 4.1.2.3 for more details
754  *
755  */
756 static bool handle_normal_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
757  xcb_atom_t name, xcb_get_property_reply_t *reply) {
758  Con *con = con_by_window_id(window);
759  if (con == NULL) {
760  DLOG("Received WM_NORMAL_HINTS for unknown client\n");
761  return false;
762  }
763 
764  xcb_size_hints_t size_hints;
765 
766  //CLIENT_LOG(client);
767 
768  /* If the hints were already in this event, use them, if not, request them */
769  if (reply != NULL)
770  xcb_icccm_get_wm_size_hints_from_reply(&size_hints, reply);
771  else
773 
774  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE)) {
775  // TODO: Minimum size is not yet implemented
776  DLOG("Minimum size: %d (width) x %d (height)\n", size_hints.min_width, size_hints.min_height);
777  }
778 
779  bool changed = false;
780  if ((size_hints.flags & XCB_ICCCM_SIZE_HINT_P_RESIZE_INC)) {
781  if (size_hints.width_inc > 0 && size_hints.width_inc < 0xFFFF)
782  if (con->width_increment != size_hints.width_inc) {
783  con->width_increment = size_hints.width_inc;
784  changed = true;
785  }
786  if (size_hints.height_inc > 0 && size_hints.height_inc < 0xFFFF)
787  if (con->height_increment != size_hints.height_inc) {
788  con->height_increment = size_hints.height_inc;
789  changed = true;
790  }
791 
792  if (changed)
793  DLOG("resize increments changed\n");
794  }
795 
796  int base_width = 0, base_height = 0;
797 
798  /* base_width/height are the desired size of the window.
799  We check if either the program-specified size or the program-specified
800  min-size is available */
801  if (size_hints.flags & XCB_ICCCM_SIZE_HINT_BASE_SIZE) {
802  base_width = size_hints.base_width;
803  base_height = size_hints.base_height;
804  } else if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE) {
805  /* TODO: is this right? icccm says not */
806  base_width = size_hints.min_width;
807  base_height = size_hints.min_height;
808  }
809 
810  if (base_width != con->base_width ||
811  base_height != con->base_height) {
812  con->base_width = base_width;
813  con->base_height = base_height;
814  DLOG("client's base_height changed to %d\n", base_height);
815  DLOG("client's base_width changed to %d\n", base_width);
816  changed = true;
817  }
818 
819  /* If no aspect ratio was set or if it was invalid, we ignore the hints */
820  if (!(size_hints.flags & XCB_ICCCM_SIZE_HINT_P_ASPECT) ||
821  (size_hints.min_aspect_num <= 0) ||
822  (size_hints.min_aspect_den <= 0)) {
823  goto render_and_return;
824  }
825 
826  /* XXX: do we really use rect here, not window_rect? */
827  double width = con->rect.width - base_width;
828  double height = con->rect.height - base_height;
829  /* Convert numerator/denominator to a double */
830  double min_aspect = (double)size_hints.min_aspect_num / size_hints.min_aspect_den;
831  double max_aspect = (double)size_hints.max_aspect_num / size_hints.min_aspect_den;
832 
833  DLOG("Aspect ratio set: minimum %f, maximum %f\n", min_aspect, max_aspect);
834  DLOG("width = %f, height = %f\n", width, height);
835 
836  /* Sanity checks, this is user-input, in a way */
837  if (max_aspect <= 0 || min_aspect <= 0 || height == 0 || (width / height) <= 0)
838  goto render_and_return;
839 
840  /* Check if we need to set proportional_* variables using the correct ratio */
841  double aspect_ratio = 0.0;
842  if ((width / height) < min_aspect) {
843  aspect_ratio = min_aspect;
844  } else if ((width / height) > max_aspect) {
845  aspect_ratio = max_aspect;
846  } else goto render_and_return;
847 
848  if (fabs(con->aspect_ratio - aspect_ratio) > DBL_EPSILON) {
849  con->aspect_ratio = aspect_ratio;
850  changed = true;
851  }
852 
853 render_and_return:
854  if (changed)
855  tree_render();
856  FREE(reply);
857  return true;
858 }
859 
860 /*
861  * Handles the WM_HINTS property for extracting the urgency state of the window.
862  *
863  */
864 static bool handle_hints(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
865  xcb_atom_t name, xcb_get_property_reply_t *reply) {
866  Con *con = con_by_window_id(window);
867  if (con == NULL) {
868  DLOG("Received WM_HINTS for unknown client\n");
869  return false;
870  }
871 
872  xcb_icccm_wm_hints_t hints;
873 
874  if (reply == NULL)
875  if (!(reply = xcb_get_property_reply(conn, xcb_icccm_get_wm_hints(conn, window), NULL)))
876  return false;
877 
878  if (!xcb_icccm_get_wm_hints_from_reply(&hints, reply))
879  return false;
880 
881  /* Update the flag on the client directly */
882  bool hint_urgent = (xcb_icccm_wm_hints_get_urgency(&hints) != 0);
883  con_set_urgency(con, hint_urgent);
884 
885  tree_render();
886 
887  if (con->window)
888  window_update_hints(con->window, reply);
889  else free(reply);
890  return true;
891 }
892 
893 /*
894  * Handles the transient for hints set by a window, signalizing that this window is a popup window
895  * for some other window.
896  *
897  * See ICCCM 4.1.2.6 for more details
898  *
899  */
900 static bool handle_transient_for(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
901  xcb_atom_t name, xcb_get_property_reply_t *prop) {
902  Con *con;
903 
904  if ((con = con_by_window_id(window)) == NULL || con->window == NULL) {
905  DLOG("No such window\n");
906  return false;
907  }
908 
909  if (prop == NULL) {
910  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
911  false, window, XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 0, 32), NULL);
912  if (prop == NULL)
913  return false;
914  }
915 
917 
918  return true;
919 }
920 
921 /*
922  * Handles changes of the WM_CLIENT_LEADER atom which specifies if this is a
923  * toolwindow (or similar) and to which window it belongs (logical parent).
924  *
925  */
926 static bool handle_clientleader_change(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
927  xcb_atom_t name, xcb_get_property_reply_t *prop) {
928  Con *con;
929  if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
930  return false;
931 
932  if (prop == NULL) {
933  prop = xcb_get_property_reply(conn, xcb_get_property_unchecked(conn,
934  false, window, A_WM_CLIENT_LEADER, XCB_ATOM_WINDOW, 0, 32), NULL);
935  if (prop == NULL)
936  return false;
937  }
938 
939  window_update_leader(con->window, prop);
940 
941  return true;
942 }
943 
944 /*
945  * Handles FocusIn events which are generated by clients (i3’s focus changes
946  * don’t generate FocusIn events due to a different EventMask) and updates the
947  * decorations accordingly.
948  *
949  */
950 static void handle_focus_in(xcb_focus_in_event_t *event) {
951  DLOG("focus change in, for window 0x%08x\n", event->event);
952  Con *con;
953  if ((con = con_by_window_id(event->event)) == NULL || con->window == NULL)
954  return;
955  DLOG("That is con %p / %s\n", con, con->name);
956 
957  if (event->mode == XCB_NOTIFY_MODE_GRAB ||
958  event->mode == XCB_NOTIFY_MODE_UNGRAB) {
959  DLOG("FocusIn event for grab/ungrab, ignoring\n");
960  return;
961  }
962 
963  if (event->detail == XCB_NOTIFY_DETAIL_POINTER) {
964  DLOG("notify detail is pointer, ignoring this event\n");
965  return;
966  }
967 
968  if (focused_id == event->event) {
969  DLOG("focus matches the currently focused window, not doing anything\n");
970  return;
971  }
972 
973  /* Skip dock clients, they cannot get the i3 focus. */
974  if (con->parent->type == CT_DOCKAREA) {
975  DLOG("This is a dock client, not focusing.\n");
976  return;
977  }
978 
979  DLOG("focus is different, updating decorations\n");
980 
981  /* Get the currently focused workspace to check if the focus change also
982  * involves changing workspaces. If so, we need to call workspace_show() to
983  * correctly update state and send the IPC event. */
984  Con *ws = con_get_workspace(con);
985  if (ws != con_get_workspace(focused))
986  workspace_show(ws);
987 
988  con_focus(con);
989  /* We update focused_id because we don’t need to set focus again */
990  focused_id = event->event;
992  return;
993 }
994 
995 /* Returns false if the event could not be processed (e.g. the window could not
996  * be found), true otherwise */
997 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);
998 
1000  xcb_atom_t atom;
1001  uint32_t long_len;
1003 };
1004 
1006  { 0, 128, handle_windowname_change },
1007  { 0, UINT_MAX, handle_hints },
1008  { 0, 128, handle_windowname_change_legacy },
1009  { 0, UINT_MAX, handle_normal_hints },
1010  { 0, UINT_MAX, handle_clientleader_change },
1011  { 0, UINT_MAX, handle_transient_for },
1012  { 0, 128, handle_windowrole_change }
1013 };
1014 #define NUM_HANDLERS (sizeof(property_handlers) / sizeof(struct property_handler_t))
1015 
1016 /*
1017  * Sets the appropriate atoms for the property handlers after the atoms were
1018  * received from X11
1019  *
1020  */
1022 
1023  sn_monitor_context_new(sndisplay, conn_screen, startup_monitor_event, NULL, NULL);
1024 
1025  property_handlers[0].atom = A__NET_WM_NAME;
1026  property_handlers[1].atom = XCB_ATOM_WM_HINTS;
1027  property_handlers[2].atom = XCB_ATOM_WM_NAME;
1028  property_handlers[3].atom = XCB_ATOM_WM_NORMAL_HINTS;
1029  property_handlers[4].atom = A_WM_CLIENT_LEADER;
1030  property_handlers[5].atom = XCB_ATOM_WM_TRANSIENT_FOR;
1031  property_handlers[6].atom = A_WM_WINDOW_ROLE;
1032 }
1033 
1034 static void property_notify(uint8_t state, xcb_window_t window, xcb_atom_t atom) {
1035  struct property_handler_t *handler = NULL;
1036  xcb_get_property_reply_t *propr = NULL;
1037 
1038  for (int c = 0; c < sizeof(property_handlers) / sizeof(struct property_handler_t); c++) {
1039  if (property_handlers[c].atom != atom)
1040  continue;
1041 
1042  handler = &property_handlers[c];
1043  break;
1044  }
1045 
1046  if (handler == NULL) {
1047  //DLOG("Unhandled property notify for atom %d (0x%08x)\n", atom, atom);
1048  return;
1049  }
1050 
1051  if (state != XCB_PROPERTY_DELETE) {
1052  xcb_get_property_cookie_t cookie = xcb_get_property(conn, 0, window, atom, XCB_GET_PROPERTY_TYPE_ANY, 0, handler->long_len);
1053  propr = xcb_get_property_reply(conn, cookie, 0);
1054  }
1055 
1056  /* the handler will free() the reply unless it returns false */
1057  if (!handler->cb(NULL, conn, state, window, atom, propr))
1058  FREE(propr);
1059 }
1060 
1061 /*
1062  * Takes an xcb_generic_event_t and calls the appropriate handler, based on the
1063  * event type.
1064  *
1065  */
1066 void handle_event(int type, xcb_generic_event_t *event) {
1067  if (randr_base > -1 &&
1068  type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) {
1069  handle_screen_change(event);
1070  return;
1071  }
1072 
1073  switch (type) {
1074  case XCB_KEY_PRESS:
1075  case XCB_KEY_RELEASE:
1076  handle_key_press((xcb_key_press_event_t*)event);
1077  break;
1078 
1079  case XCB_BUTTON_PRESS:
1080  handle_button_press((xcb_button_press_event_t*)event);
1081  break;
1082 
1083  case XCB_MAP_REQUEST:
1084  handle_map_request((xcb_map_request_event_t*)event);
1085  break;
1086 
1087  case XCB_UNMAP_NOTIFY:
1088  handle_unmap_notify_event((xcb_unmap_notify_event_t*)event);
1089  break;
1090 
1091  case XCB_DESTROY_NOTIFY:
1092  handle_destroy_notify_event((xcb_destroy_notify_event_t*)event);
1093  break;
1094 
1095  case XCB_EXPOSE:
1096  handle_expose_event((xcb_expose_event_t*)event);
1097  break;
1098 
1099  case XCB_MOTION_NOTIFY:
1100  handle_motion_notify((xcb_motion_notify_event_t*)event);
1101  break;
1102 
1103  /* Enter window = user moved his mouse over the window */
1104  case XCB_ENTER_NOTIFY:
1105  handle_enter_notify((xcb_enter_notify_event_t*)event);
1106  break;
1107 
1108  /* Client message are sent to the root window. The only interesting
1109  * client message for us is _NET_WM_STATE, we honour
1110  * _NET_WM_STATE_FULLSCREEN and _NET_WM_STATE_DEMANDS_ATTENTION */
1111  case XCB_CLIENT_MESSAGE:
1112  handle_client_message((xcb_client_message_event_t*)event);
1113  break;
1114 
1115  /* Configure request = window tried to change size on its own */
1116  case XCB_CONFIGURE_REQUEST:
1117  handle_configure_request((xcb_configure_request_event_t*)event);
1118  break;
1119 
1120  /* Mapping notify = keyboard mapping changed (Xmodmap), re-grab bindings */
1121  case XCB_MAPPING_NOTIFY:
1122  handle_mapping_notify((xcb_mapping_notify_event_t*)event);
1123  break;
1124 
1125  case XCB_FOCUS_IN:
1126  handle_focus_in((xcb_focus_in_event_t*)event);
1127  break;
1128 
1129  case XCB_PROPERTY_NOTIFY: {
1130  xcb_property_notify_event_t *e = (xcb_property_notify_event_t*)event;
1131  last_timestamp = e->time;
1132  property_notify(e->state, e->window, e->atom);
1133  break;
1134  }
1135 
1136  default:
1137  //DLOG("Unhandled event of type %d\n", type);
1138  break;
1139  }
1140 }