2 #define I3__FILE__ "con.c"
4 * vim:ts=4:sw=4:expandtab
6 * i3 - an improved dynamic tiling window manager
7 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
9 * con.c: Functions which deal with containers directly (creating containers,
10 * searching containers, getting specific properties from containers,
15 #include "yajl_utils.h"
17 static void con_on_remove_child(Con *con);
20 * force parent split containers to be redrawn
23 void con_force_split_parents_redraw(Con *con) {
26 while (parent && parent->type != CT_WORKSPACE && parent->type != CT_DOCKAREA) {
27 if (!con_is_leaf(parent))
28 FREE(parent->deco_render_params);
29 parent = parent->parent;
34 * Create a new container (and attach it to the given parent, if not NULL).
35 * This function only initializes the data structures.
38 Con *con_new_skeleton(Con *parent, i3Window *window) {
39 Con *new = scalloc(sizeof(Con));
40 new->on_remove_child = con_on_remove_child;
41 TAILQ_INSERT_TAIL(&all_cons, new, all_cons);
42 new->aspect_ratio = 0.0;
45 new->border_style = config.default_border;
46 new->current_border_width = -1;
48 new->depth = window->depth;
50 new->depth = XCB_COPY_FROM_PARENT;
51 DLOG("opening window\n");
53 TAILQ_INIT(&(new->floating_head));
54 TAILQ_INIT(&(new->nodes_head));
55 TAILQ_INIT(&(new->focus_head));
56 TAILQ_INIT(&(new->swallow_head));
59 con_attach(new, parent, false);
64 /* A wrapper for con_new_skeleton, to retain the old con_new behaviour
67 Con *con_new(Con *parent, i3Window *window) {
68 Con *new = con_new_skeleton(parent, window);
69 x_con_init(new, new->depth);
74 * Attaches the given container to the given parent. This happens when moving
75 * a container or when inserting a new container at a specific place in the
78 * ignore_focus is to just insert the Con at the end (useful when creating a
79 * new split container *around* some containers, that is, detaching and
80 * attaching them in order without wanting to mess with the focus in between).
83 void con_attach(Con *con, Con *parent, bool ignore_focus) {
87 struct nodes_head *nodes_head = &(parent->nodes_head);
88 struct focus_head *focus_head = &(parent->focus_head);
90 /* Workspaces are handled differently: they need to be inserted at the
92 if (con->type == CT_WORKSPACE) {
93 DLOG("it's a workspace. num = %d\n", con->num);
94 if (con->num == -1 || TAILQ_EMPTY(nodes_head)) {
95 TAILQ_INSERT_TAIL(nodes_head, con, nodes);
97 current = TAILQ_FIRST(nodes_head);
98 if (con->num < current->num) {
99 /* we need to insert the container at the beginning */
100 TAILQ_INSERT_HEAD(nodes_head, con, nodes);
102 while (current->num != -1 && con->num > current->num) {
103 current = TAILQ_NEXT(current, nodes);
104 if (current == TAILQ_END(nodes_head)) {
109 /* we need to insert con after current, if current is not NULL */
111 TAILQ_INSERT_BEFORE(current, con, nodes);
113 TAILQ_INSERT_TAIL(nodes_head, con, nodes);
116 goto add_to_focus_head;
119 if (con->type == CT_FLOATING_CON) {
120 DLOG("Inserting into floating containers\n");
121 TAILQ_INSERT_TAIL(&(parent->floating_head), con, floating_windows);
124 /* Get the first tiling container in focus stack */
125 TAILQ_FOREACH(loop, &(parent->focus_head), focused) {
126 if (loop->type == CT_FLOATING_CON)
133 /* When the container is not a split container (but contains a window)
134 * and is attached to a workspace, we check if the user configured a
135 * workspace_layout. This is done in workspace_attach_to, which will
136 * provide us with the container to which we should attach (either the
137 * workspace or a new split container with the configured
140 if (con->window != NULL &&
141 parent->type == CT_WORKSPACE &&
142 parent->workspace_layout != L_DEFAULT) {
143 DLOG("Parent is a workspace. Applying default layout...\n");
144 Con *target = workspace_attach_to(parent);
146 /* Attach the original con to this new split con instead */
147 nodes_head = &(target->nodes_head);
148 focus_head = &(target->focus_head);
149 con->parent = target;
155 /* Insert the container after the tiling container, if found.
156 * When adding to a CT_OUTPUT, just append one after another. */
157 if (current && parent->type != CT_OUTPUT) {
158 DLOG("Inserting con = %p after last focused tiling con %p\n",
160 TAILQ_INSERT_AFTER(nodes_head, current, con, nodes);
162 TAILQ_INSERT_TAIL(nodes_head, con, nodes);
166 /* We insert to the TAIL because con_focus() will correct this.
167 * This way, we have the option to insert Cons without having
169 TAILQ_INSERT_TAIL(focus_head, con, focused);
170 con_force_split_parents_redraw(con);
174 * Detaches the given container from its current parent
177 void con_detach(Con *con) {
178 con_force_split_parents_redraw(con);
179 if (con->type == CT_FLOATING_CON) {
180 TAILQ_REMOVE(&(con->parent->floating_head), con, floating_windows);
181 TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
183 TAILQ_REMOVE(&(con->parent->nodes_head), con, nodes);
184 TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
189 * Sets input focus to the given container. Will be updated in X11 in the next
190 * run of x_push_changes().
193 void con_focus(Con *con) {
195 DLOG("con_focus = %p\n", con);
197 /* 1: set focused-pointer to the new con */
198 /* 2: exchange the position of the container in focus stack of the parent all the way up */
199 TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
200 TAILQ_INSERT_HEAD(&(con->parent->focus_head), con, focused);
201 if (con->parent->parent != NULL)
202 con_focus(con->parent);
205 /* We can't blindly reset non-leaf containers since they might have
206 * other urgent children. Therefore we only reset leafs and propagate
207 * the changes upwards via con_update_parents_urgency() which does proper
208 * checks before resetting the urgency.
210 if (con->urgent && con_is_leaf(con)) {
212 con_update_parents_urgency(con);
213 workspace_update_urgent_flag(con_get_workspace(con));
214 ipc_send_window_event("urgent", con);
219 * Returns true when this node is a leaf node (has no children)
222 bool con_is_leaf(Con *con) {
223 return TAILQ_EMPTY(&(con->nodes_head));
227 * Returns true when this con is a leaf node with a managed X11 window (e.g.,
228 * excluding dock containers)
230 bool con_has_managed_window(Con *con) {
231 return (con != NULL && con->window != NULL && con->window->id != XCB_WINDOW_NONE && con_get_workspace(con) != NULL);
235 * Returns true if this node has regular or floating children.
238 bool con_has_children(Con *con) {
239 return (!con_is_leaf(con) || !TAILQ_EMPTY(&(con->floating_head)));
243 * Returns true if a container should be considered split.
246 bool con_is_split(Con *con) {
247 if (con_is_leaf(con))
250 switch (con->layout) {
261 * Returns true if this node accepts a window (if the node swallows windows,
262 * it might already have swallowed enough and cannot hold any more).
265 bool con_accepts_window(Con *con) {
266 /* 1: workspaces never accept direct windows */
267 if (con->type == CT_WORKSPACE)
270 if (con_is_split(con)) {
271 DLOG("container %p does not accept windows, it is a split container.\n", con);
275 /* TODO: if this is a swallowing container, we need to check its max_clients */
276 return (con->window == NULL);
280 * Gets the output container (first container with CT_OUTPUT in hierarchy) this
284 Con *con_get_output(Con *con) {
286 while (result != NULL && result->type != CT_OUTPUT)
287 result = result->parent;
288 /* We must be able to get an output because focus can never be set higher
289 * in the tree (root node cannot be focused). */
290 assert(result != NULL);
295 * Gets the workspace container this node is on.
298 Con *con_get_workspace(Con *con) {
300 while (result != NULL && result->type != CT_WORKSPACE)
301 result = result->parent;
306 * Searches parenst of the given 'con' until it reaches one with the specified
307 * 'orientation'. Aborts when it comes across a floating_con.
310 Con *con_parent_with_orientation(Con *con, orientation_t orientation) {
311 DLOG("Searching for parent of Con %p with orientation %d\n", con, orientation);
312 Con *parent = con->parent;
313 if (parent->type == CT_FLOATING_CON)
315 while (con_orientation(parent) != orientation) {
316 DLOG("Need to go one level further up\n");
317 parent = parent->parent;
318 /* Abort when we reach a floating con, or an output con */
320 (parent->type == CT_FLOATING_CON ||
321 parent->type == CT_OUTPUT ||
322 (parent->parent && parent->parent->type == CT_OUTPUT)))
327 DLOG("Result: %p\n", parent);
332 * helper data structure for the breadth-first-search in
333 * con_get_fullscreen_con()
339 TAILQ_ENTRY(bfs_entry) entries;
343 * Returns the first fullscreen node below this node.
346 Con *con_get_fullscreen_con(Con *con, fullscreen_mode_t fullscreen_mode) {
347 Con *current, *child;
349 /* TODO: is breadth-first-search really appropriate? (check as soon as
350 * fullscreen levels and fullscreen for containers is implemented) */
351 TAILQ_HEAD(bfs_head, bfs_entry) bfs_head = TAILQ_HEAD_INITIALIZER(bfs_head);
352 struct bfs_entry *entry = smalloc(sizeof(struct bfs_entry));
354 TAILQ_INSERT_TAIL(&bfs_head, entry, entries);
356 while (!TAILQ_EMPTY(&bfs_head)) {
357 entry = TAILQ_FIRST(&bfs_head);
358 current = entry->con;
359 if (current != con && current->fullscreen_mode == fullscreen_mode) {
360 /* empty the queue */
361 while (!TAILQ_EMPTY(&bfs_head)) {
362 entry = TAILQ_FIRST(&bfs_head);
363 TAILQ_REMOVE(&bfs_head, entry, entries);
369 TAILQ_REMOVE(&bfs_head, entry, entries);
372 TAILQ_FOREACH(child, &(current->nodes_head), nodes) {
373 entry = smalloc(sizeof(struct bfs_entry));
375 TAILQ_INSERT_TAIL(&bfs_head, entry, entries);
378 TAILQ_FOREACH(child, &(current->floating_head), floating_windows) {
379 entry = smalloc(sizeof(struct bfs_entry));
381 TAILQ_INSERT_TAIL(&bfs_head, entry, entries);
389 * Returns true if the container is internal, such as __i3_scratch
392 bool con_is_internal(Con *con) {
393 return (con->name[0] == '_' && con->name[1] == '_');
397 * Returns true if the node is floating.
400 bool con_is_floating(Con *con) {
402 DLOG("checking if con %p is floating\n", con);
403 return (con->floating >= FLOATING_AUTO_ON);
407 * Checks if the given container is either floating or inside some floating
408 * container. It returns the FLOATING_CON container.
411 Con *con_inside_floating(Con *con) {
413 if (con->type == CT_FLOATING_CON)
416 if (con->floating >= FLOATING_AUTO_ON)
419 if (con->type == CT_WORKSPACE || con->type == CT_OUTPUT)
422 return con_inside_floating(con->parent);
426 * Checks if the given container is inside a focused container.
429 bool con_inside_focused(Con *con) {
434 return con_inside_focused(con->parent);
438 * Returns the container with the given client window ID or NULL if no such
442 Con *con_by_window_id(xcb_window_t window) {
444 TAILQ_FOREACH(con, &all_cons, all_cons)
445 if (con->window != NULL && con->window->id == window)
451 * Returns the container with the given frame ID or NULL if no such container
455 Con *con_by_frame_id(xcb_window_t frame) {
457 TAILQ_FOREACH(con, &all_cons, all_cons)
458 if (con->frame == frame)
464 * Returns the first container below 'con' which wants to swallow this window
468 Con *con_for_window(Con *con, i3Window *window, Match **store_match) {
471 //DLOG("searching con for window %p starting at con %p\n", window, con);
472 //DLOG("class == %s\n", window->class_class);
474 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
475 TAILQ_FOREACH(match, &(child->swallow_head), matches) {
476 if (!match_matches_window(match, window))
478 if (store_match != NULL)
479 *store_match = match;
482 Con *result = con_for_window(child, window, store_match);
487 TAILQ_FOREACH(child, &(con->floating_head), floating_windows) {
488 TAILQ_FOREACH(match, &(child->swallow_head), matches) {
489 if (!match_matches_window(match, window))
491 if (store_match != NULL)
492 *store_match = match;
495 Con *result = con_for_window(child, window, store_match);
504 * Returns the number of children of this container.
507 int con_num_children(Con *con) {
511 TAILQ_FOREACH(child, &(con->nodes_head), nodes)
518 * Updates the percent attribute of the children of the given container. This
519 * function needs to be called when a window is added or removed from a
523 void con_fix_percent(Con *con) {
525 int children = con_num_children(con);
527 // calculate how much we have distributed and how many containers
528 // with a percentage set we have
530 int children_with_percent = 0;
531 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
532 if (child->percent > 0.0) {
533 total += child->percent;
534 ++children_with_percent;
538 // if there were children without a percentage set, set to a value that
539 // will make those children proportional to all others
540 if (children_with_percent != children) {
541 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
542 if (child->percent <= 0.0) {
543 if (children_with_percent == 0)
544 total += (child->percent = 1.0);
546 total += (child->percent = total / children_with_percent);
551 // if we got a zero, just distribute the space equally, otherwise
552 // distribute according to the proportions we got
554 TAILQ_FOREACH(child, &(con->nodes_head), nodes)
555 child->percent = 1.0 / children;
556 } else if (total != 1.0) {
557 TAILQ_FOREACH(child, &(con->nodes_head), nodes)
558 child->percent /= total;
563 * Toggles fullscreen mode for the given container. If there already is a
564 * fullscreen container on this workspace, fullscreen will be disabled and then
565 * enabled for the container the user wants to have in fullscreen mode.
568 void con_toggle_fullscreen(Con *con, int fullscreen_mode) {
569 if (con->type == CT_WORKSPACE) {
570 DLOG("You cannot make a workspace fullscreen.\n");
574 DLOG("toggling fullscreen for %p / %s\n", con, con->name);
576 if (con->fullscreen_mode == CF_NONE)
577 con_enable_fullscreen(con, fullscreen_mode);
579 con_disable_fullscreen(con);
583 * Sets the specified fullscreen mode for the given container, sends the
584 * “fullscreen_mode” event and changes the XCB fullscreen property of the
585 * container’s window, if any.
588 static void con_set_fullscreen_mode(Con *con, fullscreen_mode_t fullscreen_mode) {
589 con->fullscreen_mode = fullscreen_mode;
591 DLOG("mode now: %d\n", con->fullscreen_mode);
593 /* Send an ipc window "fullscreen_mode" event */
594 ipc_send_window_event("fullscreen_mode", con);
596 /* update _NET_WM_STATE if this container has a window */
597 /* TODO: when a window is assigned to a container which is already
598 * fullscreened, this state needs to be pushed to the client, too */
599 if (con->window == NULL)
603 unsigned int num = 0;
605 if (con->fullscreen_mode != CF_NONE)
606 values[num++] = A__NET_WM_STATE_FULLSCREEN;
608 xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
609 A__NET_WM_STATE, XCB_ATOM_ATOM, 32, num, values);
613 * Enables fullscreen mode for the given container, if necessary.
615 * If the container’s mode is already CF_OUTPUT or CF_GLOBAL, the container is
616 * kept fullscreen but its mode is set to CF_GLOBAL and CF_OUTPUT,
619 * Other fullscreen containers will be disabled first, if they hide the new
623 void con_enable_fullscreen(Con *con, fullscreen_mode_t fullscreen_mode) {
624 if (con->type == CT_WORKSPACE) {
625 DLOG("You cannot make a workspace fullscreen.\n");
629 assert(fullscreen_mode == CF_GLOBAL || fullscreen_mode == CF_OUTPUT);
631 if (fullscreen_mode == CF_GLOBAL)
632 DLOG("enabling global fullscreen for %p / %s\n", con, con->name);
634 DLOG("enabling fullscreen for %p / %s\n", con, con->name);
636 if (con->fullscreen_mode == fullscreen_mode) {
637 DLOG("fullscreen already enabled for %p / %s\n", con, con->name);
641 Con *con_ws = con_get_workspace(con);
643 /* Disable any fullscreen container that would conflict the new one. */
644 Con *fullscreen = con_get_fullscreen_con(croot, CF_GLOBAL);
645 if (fullscreen == NULL)
646 fullscreen = con_get_fullscreen_con(con_ws, CF_OUTPUT);
647 if (fullscreen != NULL)
648 con_disable_fullscreen(fullscreen);
650 /* Set focus to new fullscreen container. Unless in global fullscreen mode
651 * and on another workspace restore focus afterwards.
652 * Switch to the container’s workspace if mode is global. */
653 Con *cur_ws = con_get_workspace(focused);
654 Con *old_focused = focused;
655 if (fullscreen_mode == CF_GLOBAL && cur_ws != con_ws)
656 workspace_show(con_ws);
658 if (fullscreen_mode != CF_GLOBAL && cur_ws != con_ws)
659 con_focus(old_focused);
661 con_set_fullscreen_mode(con, fullscreen_mode);
665 * Disables fullscreen mode for the given container regardless of the mode, if
669 void con_disable_fullscreen(Con *con) {
670 if (con->type == CT_WORKSPACE) {
671 DLOG("You cannot make a workspace fullscreen.\n");
675 DLOG("disabling fullscreen for %p / %s\n", con, con->name);
677 if (con->fullscreen_mode == CF_NONE) {
678 DLOG("fullscreen already disabled for %p / %s\n", con, con->name);
682 con_set_fullscreen_mode(con, CF_NONE);
686 * Moves the given container to the currently focused container on the given
689 * The fix_coordinates flag will translate the current coordinates (offset from
690 * the monitor position basically) to appropriate coordinates on the
691 * destination workspace.
692 * Not enabling this behaviour comes in handy when this function gets called by
693 * floating_maybe_reassign_ws, which will only "move" a floating window when it
694 * *already* changed its coordinates to a different output.
696 * The dont_warp flag disables pointer warping and will be set when this
697 * function is called while dragging a floating window.
699 * TODO: is there a better place for this function?
702 void con_move_to_workspace(Con *con, Con *workspace, bool fix_coordinates, bool dont_warp) {
703 /* Prevent moving if this would violate the fullscreen focus restrictions. */
704 if (!con_fullscreen_permits_focusing(workspace)) {
705 LOG("Cannot move out of a fullscreen container");
709 if (con_is_floating(con)) {
710 DLOG("Using FLOATINGCON instead\n");
714 Con *source_ws = con_get_workspace(con);
715 if (workspace == source_ws) {
716 DLOG("Not moving, already there\n");
720 if (con->type == CT_WORKSPACE) {
721 /* Re-parent all of the old workspace's floating windows. */
723 while (!TAILQ_EMPTY(&(source_ws->floating_head))) {
724 child = TAILQ_FIRST(&(source_ws->floating_head));
725 con_move_to_workspace(child, workspace, true, true);
728 /* If there are no non-floating children, ignore the workspace. */
729 if (con_is_leaf(con))
732 con = workspace_encapsulate(con);
734 ELOG("Workspace failed to move its contents into a container!\n");
739 /* Save the current workspace. So we can call workspace_show() by the end
740 * of this function. */
741 Con *current_ws = con_get_workspace(focused);
743 Con *source_output = con_get_output(con),
744 *dest_output = con_get_output(workspace);
746 /* 1: save the container which is going to be focused after the current
747 * container is moved away */
748 Con *focus_next = con_next_focused(con);
750 /* 2: get the focused container of this workspace */
751 Con *next = con_descend_focused(workspace);
753 /* 3: we go up one level, but only when next is a normal container */
754 if (next->type != CT_WORKSPACE) {
755 DLOG("next originally = %p / %s / type %d\n", next, next->name, next->type);
759 /* 4: if the target container is floating, we get the workspace instead.
760 * Only tiling windows need to get inserted next to the current container.
762 Con *floatingcon = con_inside_floating(next);
763 if (floatingcon != NULL) {
764 DLOG("floatingcon, going up even further\n");
765 next = floatingcon->parent;
768 if (con->type == CT_FLOATING_CON) {
769 Con *ws = con_get_workspace(next);
770 DLOG("This is a floating window, using workspace %p / %s\n", ws, ws->name);
774 if (source_output != dest_output) {
775 /* Take the relative coordinates of the current output, then add them
776 * to the coordinate space of the correct output */
777 if (fix_coordinates && con->type == CT_FLOATING_CON) {
778 floating_fix_coordinates(con, &(source_output->rect), &(dest_output->rect));
780 DLOG("Not fixing coordinates, fix_coordinates flag = %d\n", fix_coordinates);
782 /* If moving to a visible workspace, call show so it can be considered
783 * focused. Must do before attaching because workspace_show checks to see
784 * if focused container is in its area. */
785 if (workspace_is_visible(workspace)) {
786 workspace_show(workspace);
788 /* Don’t warp if told so (when dragging floating windows with the
789 * mouse for example) */
793 x_set_warp_to(&(con->rect));
797 /* If moving a fullscreen container and the destination already has a
798 * fullscreen window on it, un-fullscreen the target's fullscreen con. */
799 Con *fullscreen = con_get_fullscreen_con(workspace, CF_OUTPUT);
800 if (con->fullscreen_mode != CF_NONE && fullscreen != NULL) {
801 con_toggle_fullscreen(fullscreen, CF_OUTPUT);
805 DLOG("Re-attaching container to %p / %s\n", next, next->name);
806 /* 5: re-attach the con to the parent of this focused container */
807 Con *parent = con->parent;
809 con_attach(con, next, false);
811 /* 6: fix the percentages */
812 con_fix_percent(parent);
814 con_fix_percent(next);
816 /* 7: focus the con on the target workspace, but only within that
817 * workspace, that is, don’t move focus away if the target workspace is
819 * We don’t focus the con for i3 pseudo workspaces like __i3_scratch and
820 * we don’t focus when there is a fullscreen con on that workspace. */
821 if (!con_is_internal(workspace) && !fullscreen) {
822 /* We need to save the focused workspace on the output in case the
823 * new workspace is hidden and it's necessary to immediately switch
824 * back to the originally-focused workspace. */
825 Con *old_focus = TAILQ_FIRST(&(output_get_content(dest_output)->focus_head));
826 con_focus(con_descend_focused(con));
828 /* Restore focus if the output's focused workspace has changed. */
829 if (con_get_workspace(focused) != old_focus)
830 con_focus(old_focus);
833 /* 8: when moving to another workspace, we leave the focus on the current
834 * workspace. (see also #809) */
836 /* Descend focus stack in case focus_next is a workspace which can
837 * occur if we move to the same workspace. Also show current workspace
838 * to ensure it is focused. */
839 workspace_show(current_ws);
841 /* Set focus only if con was on current workspace before moving.
842 * Otherwise we would give focus to some window on different workspace. */
843 if (source_ws == current_ws)
844 con_focus(con_descend_focused(focus_next));
846 /* If anything within the container is associated with a startup sequence,
847 * delete it so child windows won't be created on the old workspace. */
848 struct Startup_Sequence *sequence;
849 xcb_get_property_cookie_t cookie;
850 xcb_get_property_reply_t *startup_id_reply;
852 if (!con_is_leaf(con)) {
854 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
858 cookie = xcb_get_property(conn, false, child->window->id,
859 A__NET_STARTUP_ID, XCB_GET_PROPERTY_TYPE_ANY, 0, 512);
860 startup_id_reply = xcb_get_property_reply(conn, cookie, NULL);
862 sequence = startup_sequence_get(child->window, startup_id_reply, true);
863 if (sequence != NULL)
864 startup_sequence_delete(sequence);
869 cookie = xcb_get_property(conn, false, con->window->id,
870 A__NET_STARTUP_ID, XCB_GET_PROPERTY_TYPE_ANY, 0, 512);
871 startup_id_reply = xcb_get_property_reply(conn, cookie, NULL);
873 sequence = startup_sequence_get(con->window, startup_id_reply, true);
874 if (sequence != NULL)
875 startup_sequence_delete(sequence);
878 CALL(parent, on_remove_child);
880 ipc_send_window_event("move", con);
884 * Returns the orientation of the given container (for stacked containers,
885 * vertical orientation is used regardless of the actual orientation of the
889 orientation_t con_orientation(Con *con) {
890 switch (con->layout) {
892 /* stacking containers behave like they are in vertical orientation */
897 /* tabbed containers behave like they are in vertical orientation */
902 DLOG("Someone called con_orientation() on a con with L_DEFAULT, this is a bug in the code.\n");
908 DLOG("con_orientation() called on dockarea/output (%d) container %p\n", con->layout, con);
913 DLOG("con_orientation() ran into default\n");
919 * Returns the container which will be focused next when the given container
920 * is not available anymore. Called in tree_close and con_move_to_workspace
921 * to properly restore focus.
924 Con *con_next_focused(Con *con) {
926 /* floating containers are attached to a workspace, so we focus either the
927 * next floating container (if any) or the workspace itself. */
928 if (con->type == CT_FLOATING_CON) {
929 DLOG("selecting next for CT_FLOATING_CON\n");
930 next = TAILQ_NEXT(con, floating_windows);
931 DLOG("next = %p\n", next);
933 next = TAILQ_PREV(con, floating_head, floating_windows);
934 DLOG("using prev, next = %p\n", next);
937 Con *ws = con_get_workspace(con);
939 DLOG("no more floating containers for next = %p, restoring workspace focus\n", next);
940 while (next != TAILQ_END(&(ws->focus_head)) && !TAILQ_EMPTY(&(next->focus_head))) {
941 next = TAILQ_FIRST(&(next->focus_head));
943 DLOG("skipping container itself, we want the next client\n");
944 next = TAILQ_NEXT(next, focused);
947 if (next == TAILQ_END(&(ws->focus_head))) {
948 DLOG("Focus list empty, returning ws\n");
952 /* Instead of returning the next CT_FLOATING_CON, we descend it to
953 * get an actual window to focus. */
954 next = con_descend_focused(next);
959 /* dock clients cannot be focused, so we focus the workspace instead */
960 if (con->parent->type == CT_DOCKAREA) {
961 DLOG("selecting workspace for dock client\n");
962 return con_descend_focused(output_get_content(con->parent->parent));
965 /* if 'con' is not the first entry in the focus stack, use the first one as
966 * it’s currently focused already */
967 Con *first = TAILQ_FIRST(&(con->parent->focus_head));
969 DLOG("Using first entry %p\n", first);
972 /* try to focus the next container on the same level as this one or fall
973 * back to its parent */
974 if (!(next = TAILQ_NEXT(con, focused)))
978 /* now go down the focus stack as far as
979 * possible, excluding the current container */
980 while (!TAILQ_EMPTY(&(next->focus_head)) &&
981 TAILQ_FIRST(&(next->focus_head)) != con)
982 next = TAILQ_FIRST(&(next->focus_head));
988 * Get the next/previous container in the specified orientation. This may
989 * travel up until it finds a container with suitable orientation.
992 Con *con_get_next(Con *con, char way, orientation_t orientation) {
993 DLOG("con_get_next(way=%c, orientation=%d)\n", way, orientation);
994 /* 1: get the first parent with the same orientation */
996 while (con_orientation(cur->parent) != orientation) {
997 DLOG("need to go one level further up\n");
998 if (cur->parent->type == CT_WORKSPACE) {
999 LOG("that's a workspace, we can't go further up\n");
1005 /* 2: chose next (or previous) */
1008 next = TAILQ_NEXT(cur, nodes);
1009 /* if we are at the end of the list, we need to wrap */
1010 if (next == TAILQ_END(&(parent->nodes_head)))
1013 next = TAILQ_PREV(cur, nodes_head, nodes);
1014 /* if we are at the end of the list, we need to wrap */
1015 if (next == TAILQ_END(&(cur->nodes_head)))
1018 DLOG("next = %p\n", next);
1024 * Returns the focused con inside this client, descending the tree as far as
1025 * possible. This comes in handy when attaching a con to a workspace at the
1026 * currently focused position, for example.
1029 Con *con_descend_focused(Con *con) {
1031 while (next != focused && !TAILQ_EMPTY(&(next->focus_head)))
1032 next = TAILQ_FIRST(&(next->focus_head));
1037 * Returns the focused con inside this client, descending the tree as far as
1038 * possible. This comes in handy when attaching a con to a workspace at the
1039 * currently focused position, for example.
1041 * Works like con_descend_focused but considers only tiling cons.
1044 Con *con_descend_tiling_focused(Con *con) {
1048 if (next == focused)
1052 TAILQ_FOREACH(child, &(next->focus_head), focused) {
1053 if (child->type == CT_FLOATING_CON)
1059 } while (before != next && next != focused);
1064 * Returns the leftmost, rightmost, etc. container in sub-tree. For example, if
1065 * direction is D_LEFT, then we return the rightmost container and if direction
1066 * is D_RIGHT, we return the leftmost container. This is because if we are
1067 * moving D_LEFT, and thus want the rightmost container.
1070 Con *con_descend_direction(Con *con, direction_t direction) {
1073 int orientation = con_orientation(con);
1074 DLOG("con_descend_direction(%p, orientation %d, direction %d)\n", con, orientation, direction);
1075 if (direction == D_LEFT || direction == D_RIGHT) {
1076 if (orientation == HORIZ) {
1077 /* If the direction is horizontal, we can use either the first
1078 * (D_RIGHT) or the last con (D_LEFT) */
1079 if (direction == D_RIGHT)
1080 most = TAILQ_FIRST(&(con->nodes_head));
1082 most = TAILQ_LAST(&(con->nodes_head), nodes_head);
1083 } else if (orientation == VERT) {
1084 /* Wrong orientation. We use the last focused con. Within that con,
1085 * we recurse to chose the left/right con or at least the last
1087 TAILQ_FOREACH(current, &(con->focus_head), focused) {
1088 if (current->type != CT_FLOATING_CON) {
1094 /* If the con has no orientation set, it’s not a split container
1095 * but a container with a client window, so stop recursing */
1100 if (direction == D_UP || direction == D_DOWN) {
1101 if (orientation == VERT) {
1102 /* If the direction is vertical, we can use either the first
1103 * (D_DOWN) or the last con (D_UP) */
1104 if (direction == D_UP)
1105 most = TAILQ_LAST(&(con->nodes_head), nodes_head);
1107 most = TAILQ_FIRST(&(con->nodes_head));
1108 } else if (orientation == HORIZ) {
1109 /* Wrong orientation. We use the last focused con. Within that con,
1110 * we recurse to chose the top/bottom con or at least the last
1112 TAILQ_FOREACH(current, &(con->focus_head), focused) {
1113 if (current->type != CT_FLOATING_CON) {
1119 /* If the con has no orientation set, it’s not a split container
1120 * but a container with a client window, so stop recursing */
1127 return con_descend_direction(most, direction);
1131 * Returns a "relative" Rect which contains the amount of pixels that need to
1132 * be added to the original Rect to get the final position (obviously the
1133 * amount of pixels for normal, 1pixel and borderless are different).
1136 Rect con_border_style_rect(Con *con) {
1137 adjacent_t borders_to_hide = ADJ_NONE;
1138 int border_width = con->current_border_width;
1139 DLOG("The border width for con is set to: %d\n", con->current_border_width);
1141 if (con->current_border_width < 0) {
1142 if (con_is_floating(con)) {
1143 border_width = config.default_floating_border_width;
1145 border_width = config.default_border_width;
1148 DLOG("Effective border width is set to: %d\n", border_width);
1149 /* Shortcut to avoid calling con_adjacent_borders() on dock containers. */
1150 int border_style = con_border_style(con);
1151 if (border_style == BS_NONE)
1152 return (Rect){0, 0, 0, 0};
1153 borders_to_hide = con_adjacent_borders(con) & config.hide_edge_borders;
1154 if (border_style == BS_NORMAL) {
1155 result = (Rect){border_width, 0, -(2 * border_width), -(border_width)};
1157 result = (Rect){border_width, border_width, -(2 * border_width), -(2 * border_width)};
1160 /* Floating windows are never adjacent to any other window, so
1161 don’t hide their border(s). This prevents bug #998. */
1162 if (con_is_floating(con))
1165 if (borders_to_hide & ADJ_LEFT_SCREEN_EDGE) {
1166 result.x -= border_width;
1167 result.width += border_width;
1169 if (borders_to_hide & ADJ_RIGHT_SCREEN_EDGE) {
1170 result.width += border_width;
1172 if (borders_to_hide & ADJ_UPPER_SCREEN_EDGE && (border_style != BS_NORMAL)) {
1173 result.y -= border_width;
1174 result.height += border_width;
1176 if (borders_to_hide & ADJ_LOWER_SCREEN_EDGE) {
1177 result.height += border_width;
1183 * Returns adjacent borders of the window. We need this if hide_edge_borders is
1186 adjacent_t con_adjacent_borders(Con *con) {
1187 adjacent_t result = ADJ_NONE;
1188 Con *workspace = con_get_workspace(con);
1189 if (con->rect.x == workspace->rect.x)
1190 result |= ADJ_LEFT_SCREEN_EDGE;
1191 if (con->rect.x + con->rect.width == workspace->rect.x + workspace->rect.width)
1192 result |= ADJ_RIGHT_SCREEN_EDGE;
1193 if (con->rect.y == workspace->rect.y)
1194 result |= ADJ_UPPER_SCREEN_EDGE;
1195 if (con->rect.y + con->rect.height == workspace->rect.y + workspace->rect.height)
1196 result |= ADJ_LOWER_SCREEN_EDGE;
1201 * Use this function to get a container’s border style. This is important
1202 * because when inside a stack, the border style is always BS_NORMAL.
1203 * For tabbed mode, the same applies, with one exception: when the container is
1204 * borderless and the only element in the tabbed container, the border is not
1207 * For children of a CT_DOCKAREA, the border style is always none.
1210 int con_border_style(Con *con) {
1211 Con *fs = con_get_fullscreen_con(con->parent, CF_OUTPUT);
1213 DLOG("this one is fullscreen! overriding BS_NONE\n");
1217 if (con->parent->layout == L_STACKED)
1218 return (con_num_children(con->parent) == 1 ? con->border_style : BS_NORMAL);
1220 if (con->parent->layout == L_TABBED && con->border_style != BS_NORMAL)
1221 return (con_num_children(con->parent) == 1 ? con->border_style : BS_NORMAL);
1223 if (con->parent->type == CT_DOCKAREA)
1226 return con->border_style;
1230 * Sets the given border style on con, correctly keeping the position/size of a
1234 void con_set_border_style(Con *con, int border_style, int border_width) {
1235 /* Handle the simple case: non-floating containerns */
1236 if (!con_is_floating(con)) {
1237 con->border_style = border_style;
1238 con->current_border_width = border_width;
1242 /* For floating containers, we want to keep the position/size of the
1243 * *window* itself. We first add the border pixels to con->rect to make
1244 * con->rect represent the absolute position of the window (same for
1245 * parent). Then, we change the border style and subtract the new border
1246 * pixels. For the parent, we do the same also for the decoration. */
1247 DLOG("This is a floating container\n");
1249 Con *parent = con->parent;
1250 Rect bsr = con_border_style_rect(con);
1251 int deco_height = (con->border_style == BS_NORMAL ? render_deco_height() : 0);
1253 con->rect = rect_add(con->rect, bsr);
1254 parent->rect = rect_add(parent->rect, bsr);
1255 parent->rect.y += deco_height;
1256 parent->rect.height -= deco_height;
1258 /* Change the border style, get new border/decoration values. */
1259 con->border_style = border_style;
1260 con->current_border_width = border_width;
1261 bsr = con_border_style_rect(con);
1262 deco_height = (con->border_style == BS_NORMAL ? render_deco_height() : 0);
1264 con->rect = rect_sub(con->rect, bsr);
1265 parent->rect = rect_sub(parent->rect, bsr);
1266 parent->rect.y -= deco_height;
1267 parent->rect.height += deco_height;
1271 * This function changes the layout of a given container. Use it to handle
1272 * special cases like changing a whole workspace to stacked/tabbed (creates a
1273 * new split container before).
1276 void con_set_layout(Con *con, layout_t layout) {
1277 DLOG("con_set_layout(%p, %d), con->type = %d\n",
1278 con, layout, con->type);
1280 /* Users can focus workspaces, but not any higher in the hierarchy.
1281 * Focus on the workspace is a special case, since in every other case, the
1282 * user means "change the layout of the parent split container". */
1283 if (con->type != CT_WORKSPACE)
1286 /* We fill in last_split_layout when switching to a different layout
1287 * since there are many places in the code that don’t use
1288 * con_set_layout(). */
1289 if (con->layout == L_SPLITH || con->layout == L_SPLITV)
1290 con->last_split_layout = con->layout;
1292 /* When the container type is CT_WORKSPACE, the user wants to change the
1293 * whole workspace into stacked/tabbed mode. To do this and still allow
1294 * intuitive operations (like level-up and then opening a new window), we
1295 * need to create a new split container. */
1296 if (con->type == CT_WORKSPACE &&
1297 (layout == L_STACKED || layout == L_TABBED)) {
1298 if (con_num_children(con) == 0) {
1299 DLOG("Setting workspace_layout to %d\n", layout);
1300 con->workspace_layout = layout;
1302 DLOG("Creating new split container\n");
1303 /* 1: create a new split container */
1304 Con *new = con_new(NULL, NULL);
1307 /* 2: Set the requested layout on the split container and mark it as
1309 new->layout = layout;
1310 new->last_split_layout = con->last_split_layout;
1312 /* Save the container that was focused before we move containers
1313 * around, but only if the container is visible (otherwise focus
1314 * will be restored properly automatically when switching). */
1315 Con *old_focused = TAILQ_FIRST(&(con->focus_head));
1316 if (old_focused == TAILQ_END(&(con->focus_head)))
1318 if (old_focused != NULL &&
1319 !workspace_is_visible(con_get_workspace(old_focused)))
1322 /* 3: move the existing cons of this workspace below the new con */
1323 DLOG("Moving cons\n");
1325 while (!TAILQ_EMPTY(&(con->nodes_head))) {
1326 child = TAILQ_FIRST(&(con->nodes_head));
1328 con_attach(child, new, true);
1331 /* 4: attach the new split container to the workspace */
1332 DLOG("Attaching new split to ws\n");
1333 con_attach(new, con, false);
1336 con_focus(old_focused);
1338 tree_flatten(croot);
1340 con_force_split_parents_redraw(con);
1344 if (layout == L_DEFAULT) {
1345 /* Special case: the layout formerly known as "default" (in combination
1346 * with an orientation). Since we switched to splith/splitv layouts,
1347 * using the "default" layout (which "only" should happen when using
1348 * legacy configs) is using the last split layout (either splith or
1349 * splitv) in order to still do the same thing.
1351 * Starting from v4.6 though, we will nag users about using "layout
1352 * default", and in v4.9 we will remove it entirely (with an
1353 * appropriate i3-migrate-config mechanism). */
1354 con->layout = con->last_split_layout;
1355 /* In case last_split_layout was not initialized… */
1356 if (con->layout == L_DEFAULT)
1357 con->layout = L_SPLITH;
1359 con->layout = layout;
1361 con_force_split_parents_redraw(con);
1365 * This function toggles the layout of a given container. toggle_mode can be
1366 * either 'default' (toggle only between stacked/tabbed/last_split_layout),
1367 * 'split' (toggle only between splitv/splith) or 'all' (toggle between all
1371 void con_toggle_layout(Con *con, const char *toggle_mode) {
1373 /* Users can focus workspaces, but not any higher in the hierarchy.
1374 * Focus on the workspace is a special case, since in every other case, the
1375 * user means "change the layout of the parent split container". */
1376 if (con->type != CT_WORKSPACE)
1377 parent = con->parent;
1378 DLOG("con_toggle_layout(%p, %s), parent = %p\n", con, toggle_mode, parent);
1380 if (strcmp(toggle_mode, "split") == 0) {
1381 /* Toggle between splits. When the current layout is not a split
1382 * layout, we just switch back to last_split_layout. Otherwise, we
1383 * change to the opposite split layout. */
1384 if (parent->layout != L_SPLITH && parent->layout != L_SPLITV)
1385 con_set_layout(con, parent->last_split_layout);
1387 if (parent->layout == L_SPLITH)
1388 con_set_layout(con, L_SPLITV);
1390 con_set_layout(con, L_SPLITH);
1393 if (parent->layout == L_STACKED)
1394 con_set_layout(con, L_TABBED);
1395 else if (parent->layout == L_TABBED) {
1396 if (strcmp(toggle_mode, "all") == 0)
1397 con_set_layout(con, L_SPLITH);
1399 con_set_layout(con, parent->last_split_layout);
1400 } else if (parent->layout == L_SPLITH || parent->layout == L_SPLITV) {
1401 if (strcmp(toggle_mode, "all") == 0) {
1402 /* When toggling through all modes, we toggle between
1403 * splith/splitv, whereas normally we just directly jump to
1405 if (parent->layout == L_SPLITH)
1406 con_set_layout(con, L_SPLITV);
1408 con_set_layout(con, L_STACKED);
1410 con_set_layout(con, L_STACKED);
1417 * Callback which will be called when removing a child from the given con.
1418 * Kills the container if it is empty and replaces it with the child if there
1419 * is exactly one child.
1422 static void con_on_remove_child(Con *con) {
1423 DLOG("on_remove_child\n");
1425 /* Every container 'above' (in the hierarchy) the workspace content should
1426 * not be closed when the last child was removed */
1427 if (con->type == CT_OUTPUT ||
1428 con->type == CT_ROOT ||
1429 con->type == CT_DOCKAREA ||
1430 (con->parent != NULL && con->parent->type == CT_OUTPUT)) {
1431 DLOG("not handling, type = %d, name = %s\n", con->type, con->name);
1435 /* For workspaces, close them only if they're not visible anymore */
1436 if (con->type == CT_WORKSPACE) {
1437 if (TAILQ_EMPTY(&(con->focus_head)) && !workspace_is_visible(con)) {
1438 LOG("Closing old workspace (%p / %s), it is empty\n", con, con->name);
1439 yajl_gen gen = ipc_marshal_workspace_event("empty", con, NULL);
1440 tree_close(con, DONT_KILL_WINDOW, false, false);
1442 const unsigned char *payload;
1444 y(get_buf, &payload, &length);
1445 ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, (const char *)payload);
1452 con_force_split_parents_redraw(con);
1453 con->urgent = con_has_urgent_child(con);
1454 con_update_parents_urgency(con);
1456 /* TODO: check if this container would swallow any other client and
1457 * don’t close it automatically. */
1458 int children = con_num_children(con);
1459 if (children == 0) {
1460 DLOG("Container empty, closing\n");
1461 tree_close(con, DONT_KILL_WINDOW, false, false);
1467 * Determines the minimum size of the given con by looking at its children (for
1468 * split/stacked/tabbed cons). Will be called when resizing floating cons
1471 Rect con_minimum_size(Con *con) {
1472 DLOG("Determining minimum size for con %p\n", con);
1474 if (con_is_leaf(con)) {
1475 DLOG("leaf node, returning 75x50\n");
1476 return (Rect){0, 0, 75, 50};
1479 if (con->type == CT_FLOATING_CON) {
1480 DLOG("floating con\n");
1481 Con *child = TAILQ_FIRST(&(con->nodes_head));
1482 return con_minimum_size(child);
1485 if (con->layout == L_STACKED || con->layout == L_TABBED) {
1486 uint32_t max_width = 0, max_height = 0, deco_height = 0;
1488 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
1489 Rect min = con_minimum_size(child);
1490 deco_height += child->deco_rect.height;
1491 max_width = max(max_width, min.width);
1492 max_height = max(max_height, min.height);
1494 DLOG("stacked/tabbed now, returning %d x %d + deco_rect = %d\n",
1495 max_width, max_height, deco_height);
1496 return (Rect){0, 0, max_width, max_height + deco_height};
1499 /* For horizontal/vertical split containers we sum up the width (h-split)
1500 * or height (v-split) and use the maximum of the height (h-split) or width
1501 * (v-split) as minimum size. */
1502 if (con_is_split(con)) {
1503 uint32_t width = 0, height = 0;
1505 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
1506 Rect min = con_minimum_size(child);
1507 if (con->layout == L_SPLITH) {
1509 height = max(height, min.height);
1511 height += min.height;
1512 width = max(width, min.width);
1515 DLOG("split container, returning width = %d x height = %d\n", width, height);
1516 return (Rect){0, 0, width, height};
1519 ELOG("Unhandled case, type = %d, layout = %d, split = %d\n",
1520 con->type, con->layout, con_is_split(con));
1525 * Returns true if changing the focus to con would be allowed considering
1526 * the fullscreen focus constraints. Specifically, if a fullscreen container or
1527 * any of its descendants is focused, this function returns true if and only if
1528 * focusing con would mean that focus would still be visible on screen, i.e.,
1529 * the newly focused container would not be obscured by a fullscreen container.
1531 * In the simplest case, if a fullscreen container or any of its descendants is
1532 * fullscreen, this functions returns true if con is the fullscreen container
1533 * itself or any of its descendants, as this means focus wouldn't escape the
1534 * boundaries of the fullscreen container.
1536 * In case the fullscreen container is of type CF_OUTPUT, this function returns
1537 * true if con is on a different workspace, as focus wouldn't be obscured by
1538 * the fullscreen container that is constrained to a different workspace.
1540 * Note that this same logic can be applied to moving containers. If a
1541 * container can be focused under the fullscreen focus constraints, it can also
1542 * become a parent or sibling to the currently focused container.
1545 bool con_fullscreen_permits_focusing(Con *con) {
1546 /* No focus, no problem. */
1550 /* Find the first fullscreen ascendent. */
1552 while (fs && fs->fullscreen_mode == CF_NONE)
1555 /* fs must be non-NULL since the workspace con doesn’t have CF_NONE and
1556 * there always has to be a workspace con in the hierarchy. */
1558 /* The most common case is we hit the workspace level. In this
1559 * situation, changing focus is also harmless. */
1560 assert(fs->fullscreen_mode != CF_NONE);
1561 if (fs->type == CT_WORKSPACE)
1564 /* Allow it if the container itself is the fullscreen container. */
1568 /* If fullscreen is per-output, the focus being in a different workspace is
1569 * sufficient to guarantee that change won't leave fullscreen in bad shape. */
1570 if (fs->fullscreen_mode == CF_OUTPUT &&
1571 con_get_workspace(con) != con_get_workspace(fs)) {
1575 /* Allow it only if the container to be focused is contained within the
1576 * current fullscreen container. */
1578 if (con->parent == fs)
1583 /* Focusing con would hide it behind a fullscreen window, disallow it. */
1589 * Checks if the given container has an urgent child.
1592 bool con_has_urgent_child(Con *con) {
1595 if (con_is_leaf(con))
1598 /* We are not interested in floating windows since they can only be
1599 * attached to a workspace → nodes_head instead of focus_head */
1600 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
1601 if (con_has_urgent_child(child))
1609 * Make all parent containers urgent if con is urgent or clear the urgent flag
1610 * of all parent containers if there are no more urgent children left.
1613 void con_update_parents_urgency(Con *con) {
1614 Con *parent = con->parent;
1616 bool new_urgency_value = con->urgent;
1617 while (parent && parent->type != CT_WORKSPACE && parent->type != CT_DOCKAREA) {
1618 if (new_urgency_value) {
1619 parent->urgent = true;
1621 /* We can only reset the urgency when the parent
1622 * has no other urgent children */
1623 if (!con_has_urgent_child(parent))
1624 parent->urgent = false;
1626 parent = parent->parent;
1631 * Set urgency flag to the container, all the parent containers and the workspace.
1634 void con_set_urgency(Con *con, bool urgent) {
1635 if (focused == con) {
1636 DLOG("Ignoring urgency flag for current client\n");
1637 con->window->urgent.tv_sec = 0;
1638 con->window->urgent.tv_usec = 0;
1642 if (con->urgency_timer == NULL) {
1643 con->urgent = urgent;
1645 DLOG("Discarding urgency WM_HINT because timer is running\n");
1650 gettimeofday(&con->window->urgent, NULL);
1652 con->window->urgent.tv_sec = 0;
1653 con->window->urgent.tv_usec = 0;
1657 con_update_parents_urgency(con);
1660 /* Set the urgency flag on the workspace, if a workspace could be found
1661 * (for dock clients, that is not the case). */
1662 if ((ws = con_get_workspace(con)) != NULL)
1663 workspace_update_urgent_flag(ws);
1665 if (con->urgent == urgent) {
1666 LOG("Urgency flag changed to %d\n", con->urgent);
1667 ipc_send_window_event("urgent", con);
1672 * Create a string representing the subtree under con.
1675 char *con_get_tree_representation(Con *con) {
1676 /* this code works as follows:
1677 * 1) create a string with the layout type (D/V/H/T/S) and an opening bracket
1678 * 2) append the tree representation of the children to the string
1679 * 3) add closing bracket
1681 * The recursion ends when we hit a leaf, in which case we return the
1682 * class_instance of the contained window.
1685 /* end of recursion */
1686 if (con_is_leaf(con)) {
1688 return sstrdup("nowin");
1690 if (!con->window->class_instance)
1691 return sstrdup("noinstance");
1693 return sstrdup(con->window->class_instance);
1697 /* 1) add the Layout type to buf */
1698 if (con->layout == L_DEFAULT)
1699 buf = sstrdup("D[");
1700 else if (con->layout == L_SPLITV)
1701 buf = sstrdup("V[");
1702 else if (con->layout == L_SPLITH)
1703 buf = sstrdup("H[");
1704 else if (con->layout == L_TABBED)
1705 buf = sstrdup("T[");
1706 else if (con->layout == L_STACKED)
1707 buf = sstrdup("S[");
1709 ELOG("BUG: Code not updated to account for new layout type\n");
1713 /* 2) append representation of children */
1715 TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
1716 char *child_txt = con_get_tree_representation(child);
1719 sasprintf(&tmp_buf, "%s%s%s", buf,
1720 (TAILQ_FIRST(&(con->nodes_head)) == child ? "" : " "), child_txt);
1725 /* 3) close the brackets */
1727 sasprintf(&complete_buf, "%s]", buf);
1730 return complete_buf;