gri3-wm/src/tree.c

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C
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/*
* vim:ts=4:sw=4:expandtab
*/
#include "all.h"
struct Con *croot;
struct Con *focused;
struct all_cons_head all_cons = TAILQ_HEAD_INITIALIZER(all_cons);
/*
* Loads tree from ~/.i3/_restart.json (used for in-place restarts).
*
*/
bool tree_restore(const char *path) {
char *globbed = resolve_tilde(path);
if (!path_exists(globbed)) {
LOG("%s does not exist, not restoring tree\n", globbed);
free(globbed);
return false;
}
/* TODO: refactor the following */
croot = con_new(NULL);
focused = croot;
tree_append_json(globbed);
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printf("appended tree, using new root\n");
croot = TAILQ_FIRST(&(croot->nodes_head));
printf("new root = %p\n", croot);
Con *out = TAILQ_FIRST(&(croot->nodes_head));
printf("out = %p\n", out);
Con *ws = TAILQ_FIRST(&(out->nodes_head));
printf("ws = %p\n", ws);
return true;
}
/*
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* Initializes the tree by creating the root node. The CT_OUTPUT Cons below the
* root node are created in randr.c for each Output.
*
*/
void tree_init() {
croot = con_new(NULL);
FREE(croot->name);
croot->name = "root";
croot->type = CT_ROOT;
}
/*
* Opens an empty container in the current container
*
*/
Con *tree_open_con(Con *con) {
if (con == NULL) {
/* every focusable Con has a parent (outputs have parent root) */
con = focused->parent;
/* If the parent is an output, we are on a workspace. In this case,
* the new container needs to be opened as a leaf of the workspace. */
if (con->parent->type == CT_OUTPUT && con->type != CT_DOCKAREA) {
con = focused;
}
/* If the currently focused container is a floating container, we
* attach the new container to the currently focused spot in its
* workspace. */
if (con->type == CT_FLOATING_CON) {
con = con_descend_tiling_focused(con->parent);
if (con->type != CT_WORKSPACE)
con = con->parent;
}
DLOG("con = %p\n", con);
}
assert(con != NULL);
/* 3. create the container and attach it to its parent */
Con *new = con_new(con);
/* 4: re-calculate child->percent for each child */
con_fix_percent(con);
return new;
}
static bool _is_con_mapped(Con *con) {
Con *child;
TAILQ_FOREACH(child, &(con->nodes_head), nodes)
if (_is_con_mapped(child))
return true;
return con->mapped;
}
/*
* Closes the given container including all children.
* Returns true if the container was killed or false if just WM_DELETE was sent
* and the window is expected to kill itself.
*
*/
bool tree_close(Con *con, kill_window_t kill_window, bool dont_kill_parent) {
bool was_mapped = con->mapped;
Con *parent = con->parent;
if (!was_mapped) {
/* Even if the container itself is not mapped, its children may be
* mapped (for example split containers don't have a mapped window on
* their own but usually contain mapped children). */
was_mapped = _is_con_mapped(con);
}
/* Get the container which is next focused */
Con *next = con_next_focused(con);
DLOG("next = %p, focused = %p\n", next, focused);
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DLOG("closing %p, kill_window = %d\n", con, kill_window);
Con *child, *nextchild;
bool abort_kill = false;
/* We cannot use TAILQ_FOREACH because the children get deleted
* in their parents nodes_head */
for (child = TAILQ_FIRST(&(con->nodes_head)); child; ) {
nextchild = TAILQ_NEXT(child, nodes);
DLOG("killing child=%p\n", child);
if (!tree_close(child, kill_window, true))
abort_kill = true;
child = nextchild;
}
if (abort_kill) {
DLOG("One of the children could not be killed immediately (WM_DELETE sent), aborting.\n");
return false;
}
if (con->window != NULL) {
if (kill_window != DONT_KILL_WINDOW) {
x_window_kill(con->window->id, kill_window);
return false;
} else {
/* un-parent the window */
xcb_reparent_window(conn, con->window->id, root, 0, 0);
/* We are no longer handling this window, thus set WM_STATE to
* WM_STATE_WITHDRAWN (see ICCCM 4.1.3.1) */
long data[] = { XCB_ICCCM_WM_STATE_WITHDRAWN, XCB_NONE };
xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
A_WM_STATE, A_WM_STATE, 32, 2, data);
}
FREE(con->window->class_class);
FREE(con->window->class_instance);
FREE(con->window->name_x);
FREE(con->window->name_json);
free(con->window);
}
/* kill the X11 part of this container */
x_con_kill(con);
con_detach(con);
if (con->type != CT_FLOATING_CON) {
/* If the container is *not* floating, we might need to re-distribute
* percentage values for the resized containers. */
con_fix_percent(parent);
}
if (con_is_floating(con)) {
Con *ws = con_get_workspace(con);
DLOG("Container was floating, killing floating container\n");
tree_close(parent, DONT_KILL_WINDOW, false);
DLOG("parent container killed\n");
if (con == focused) {
DLOG("This is the focused container, i need to find another one to focus. I start looking at ws = %p\n", ws);
/* go down the focus stack as far as possible */
next = con_descend_focused(ws);
dont_kill_parent = true;
DLOG("Alright, focusing %p\n", next);
} else {
next = NULL;
}
}
free(con->name);
FREE(con->deco_render_params);
TAILQ_REMOVE(&all_cons, con, all_cons);
free(con);
/* in the case of floating windows, we already focused another container
* when closing the parent, so we can exit now. */
if (!next) {
DLOG("No next container, i will just exit now\n");
return true;
}
if (was_mapped || con == focused) {
if ((kill_window != DONT_KILL_WINDOW) || !dont_kill_parent || con == focused) {
DLOG("focusing %p / %s\n", next, next->name);
/* TODO: check if the container (or one of its children) was focused */
if (next->type == CT_DOCKAREA) {
/* Instead of focusing the dockarea, we need to restore focus to the workspace */
con_focus(con_descend_focused(output_get_content(next->parent)));
} else {
con_focus(next);
}
}
else {
DLOG("not focusing because we're not killing anybody");
}
} else {
DLOG("not focusing, was not mapped\n");
}
/* check if the parent container is empty now and close it */
if (!dont_kill_parent)
CALL(parent, on_remove_child);
return true;
}
/*
* Closes the current container using tree_close().
*
*/
void tree_close_con(kill_window_t kill_window) {
assert(focused != NULL);
if (focused->type == CT_WORKSPACE) {
LOG("Cannot close workspace\n");
return;
}
/* There *should* be no possibility to focus outputs / root container */
assert(focused->type != CT_OUTPUT);
assert(focused->type != CT_ROOT);
/* Kill con */
tree_close(focused, kill_window, false);
}
/*
* Splits (horizontally or vertically) the given container by creating a new
* container which contains the old one and the future ones.
*
*/
void tree_split(Con *con, orientation_t orientation) {
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/* for a workspace, we just need to change orientation */
if (con->type == CT_WORKSPACE) {
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DLOG("Workspace, simply changing orientation to %d\n", orientation);
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con->orientation = orientation;
return;
}
Con *parent = con->parent;
/* if we are in a container whose parent contains only one
* child (its split functionality is unused so far), we just change the
* orientation (more intuitive than splitting again) */
if (con_num_children(parent) == 1) {
parent->orientation = orientation;
DLOG("Just changing orientation of existing container\n");
return;
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}
DLOG("Splitting in orientation %d\n", orientation);
/* 2: replace it with a new Con */
Con *new = con_new(NULL);
TAILQ_REPLACE(&(parent->nodes_head), con, new, nodes);
TAILQ_REPLACE(&(parent->focus_head), con, new, focused);
new->parent = parent;
new->orientation = orientation;
/* 3: swap 'percent' (resize factor) */
new->percent = con->percent;
con->percent = 0.0;
/* 4: add it as a child to the new Con */
con_attach(con, new, false);
}
/*
* Moves focus one level up.
*
*/
void level_up() {
/* We cannot go up when we are in fullscreen mode at the moment, that would
* be totally not intuitive */
if (focused->fullscreen_mode != CF_NONE) {
LOG("Currently in fullscreen, not going up\n");
return;
}
/* We can focus up to the workspace, but not any higher in the tree */
if ((focused->parent->type != CT_CON &&
focused->parent->type != CT_WORKSPACE) ||
focused->type == CT_WORKSPACE) {
LOG("Cannot go up any further\n");
return;
}
con_focus(focused->parent);
}
/*
* Moves focus one level down.
*
*/
void level_down() {
/* Go down the focus stack of the current node */
Con *next = TAILQ_FIRST(&(focused->focus_head));
if (next == TAILQ_END(&(focused->focus_head))) {
printf("cannot go down\n");
return;
}
con_focus(next);
}
static void mark_unmapped(Con *con) {
Con *current;
con->mapped = false;
TAILQ_FOREACH(current, &(con->nodes_head), nodes)
mark_unmapped(current);
if (con->type == CT_WORKSPACE) {
/* We need to call mark_unmapped on floating nodes aswell since we can
* make containers floating. */
TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
mark_unmapped(current);
}
}
/*
* Renders the tree, that is rendering all outputs using render_con() and
* pushing the changes to X11 using x_push_changes().
*
*/
void tree_render() {
if (croot == NULL)
return;
DLOG("-- BEGIN RENDERING --\n");
/* Reset map state for all nodes in tree */
/* TODO: a nicer method to walk all nodes would be good, maybe? */
mark_unmapped(croot);
croot->mapped = true;
/* We start rendering at an output */
Con *output;
TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
DLOG("output %p / %s\n", output, output->name);
render_con(output, false);
}
x_push_changes(croot);
DLOG("-- END RENDERING --\n");
}
/*
* Changes focus in the given way (next/previous) and given orientation
* (horizontal/vertical).
*
*/
void tree_next(char way, orientation_t orientation) {
/* 1: get the first parent with the same orientation */
Con *parent = focused->parent;
while (focused->type != CT_WORKSPACE &&
(con_orientation(parent) != orientation ||
con_num_children(parent) == 1)) {
LOG("need to go one level further up\n");
/* if the current parent is an output, we are at a workspace
* and the orientation still does not match */
if (parent->type == CT_WORKSPACE)
return;
parent = parent->parent;
}
Con *current = TAILQ_FIRST(&(parent->focus_head));
assert(current != TAILQ_END(&(parent->focus_head)));
if (TAILQ_EMPTY(&(parent->nodes_head))) {
DLOG("Nothing to focus here, move along...\n");
return;
}
/* 2: chose next (or previous) */
Con *next;
if (way == 'n') {
next = TAILQ_NEXT(current, nodes);
/* if we are at the end of the list, we need to wrap */
if (next == TAILQ_END(&(parent->nodes_head)))
next = TAILQ_FIRST(&(parent->nodes_head));
} else {
next = TAILQ_PREV(current, nodes_head, nodes);
/* if we are at the end of the list, we need to wrap */
if (next == TAILQ_END(&(parent->nodes_head)))
next = TAILQ_LAST(&(parent->nodes_head), nodes_head);
}
/* 3: focus choice comes in here. at the moment we will go down
* until we find a window */
/* TODO: check for window, atm we only go down as far as possible */
con_focus(con_descend_focused(next));
}
/*
* tree_flatten() removes pairs of redundant split containers, e.g.:
* [workspace, horizontal]
* [v-split] [child3]
* [h-split]
* [child1] [child2]
* In this example, the v-split and h-split container are redundant.
* Such a situation can be created by moving containers in a direction which is
* not the orientation of their parent container. i3 needs to create a new
* split container then and if you move containers this way multiple times,
* redundant chains of split-containers can be the result.
*
*/
void tree_flatten(Con *con) {
Con *current, *child, *parent = con->parent;
DLOG("Checking if I can flatten con = %p / %s\n", con, con->name);
/* We only consider normal containers without windows */
if (con->type != CT_CON || con->window != NULL)
goto recurse;
/* Ensure it got only one child */
child = TAILQ_FIRST(&(con->nodes_head));
if (child == NULL || TAILQ_NEXT(child, nodes) != NULL)
goto recurse;
/* The child must have a different orientation than the con but the same as
* the cons parent to be redundant */
if (con->orientation == NO_ORIENTATION ||
child->orientation == NO_ORIENTATION ||
con->orientation == child->orientation ||
child->orientation != parent->orientation)
goto recurse;
DLOG("Alright, I have to flatten this situation now. Stay calm.\n");
/* 1: save focus */
Con *focus_next = TAILQ_FIRST(&(child->focus_head));
DLOG("detaching...\n");
/* 2: re-attach the children to the parent before con */
while (!TAILQ_EMPTY(&(child->nodes_head))) {
current = TAILQ_FIRST(&(child->nodes_head));
DLOG("detaching current=%p / %s\n", current, current->name);
con_detach(current);
DLOG("re-attaching\n");
/* We dont use con_attach() here because for a CT_CON, the special
* case handling of con_attach() does not trigger. So all it would do
* is calling TAILQ_INSERT_AFTER, but with the wrong container. So we
* directly use the TAILQ macros. */
current->parent = parent;
TAILQ_INSERT_BEFORE(con, current, nodes);
DLOG("attaching to focus list\n");
TAILQ_INSERT_TAIL(&(parent->focus_head), current, focused);
current->percent = con->percent;
}
DLOG("re-attached all\n");
/* 3: restore focus, if con was focused */
if (focus_next != NULL &&
TAILQ_FIRST(&(parent->focus_head)) == con) {
DLOG("restoring focus to focus_next=%p\n", focus_next);
TAILQ_REMOVE(&(parent->focus_head), focus_next, focused);
TAILQ_INSERT_HEAD(&(parent->focus_head), focus_next, focused);
DLOG("restored focus.\n");
}
/* 4: close the redundant cons */
DLOG("closing redundant cons\n");
tree_close(con, DONT_KILL_WINDOW, true);
/* Well, we got to abort the recursion here because we destroyed the
* container. However, if tree_flatten() is called sufficiently often,
* there cant be the situation of having two pairs of redundant containers
* at once. Therefore, we can safely abort the recursion on this level
* after flattening. */
return;
recurse:
/* We cannot use normal foreach here because tree_flatten might close the
* current container. */
current = TAILQ_FIRST(&(con->nodes_head));
while (current != NULL) {
Con *next = TAILQ_NEXT(current, nodes);
tree_flatten(current);
current = next;
}
current = TAILQ_FIRST(&(con->floating_head));
while (current != NULL) {
Con *next = TAILQ_NEXT(current, floating_windows);
tree_flatten(current);
current = next;
}
}