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tree.c
1167 lines (1018 loc) · 27.7 KB
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tree.c
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/* Copyright (c) 2012, Bastien Dejean
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <float.h>
#include <limits.h>
#include "bspwm.h"
#include "desktop.h"
#include "ewmh.h"
#include "history.h"
#include "monitor.h"
#include "query.h"
#include "settings.h"
#include "stack.h"
#include "window.h"
#include "tree.h"
void arrange(monitor_t *m, desktop_t *d)
{
if (d->root == NULL)
return;
PRINTF("arrange %s %s\n", m->name, d->name);
xcb_rectangle_t rect = m->rectangle;
int wg = (gapless_monocle && d->layout == LAYOUT_MONOCLE ? 0 : d->window_gap);
rect.x += m->left_padding + d->left_padding + wg;
rect.y += m->top_padding + d->top_padding + wg;
rect.width -= m->left_padding + d->left_padding + d->right_padding + m->right_padding + wg;
rect.height -= m->top_padding + d->top_padding + d->bottom_padding + m->bottom_padding + wg;
apply_layout(m, d, d->root, rect, rect);
}
void apply_layout(monitor_t *m, desktop_t *d, node_t *n, xcb_rectangle_t rect, xcb_rectangle_t root_rect)
{
if (n == NULL)
return;
n->rectangle = rect;
if (is_leaf(n)) {
unsigned int bw;
if ((borderless_monocle && is_tiled(n->client) &&
!n->client->pseudo_tiled &&
d->layout == LAYOUT_MONOCLE) ||
n->client->fullscreen)
bw = 0;
else
bw = n->client->border_width;
xcb_rectangle_t r;
if (!n->client->fullscreen) {
if (!n->client->floating) {
int wg = (gapless_monocle && d->layout == LAYOUT_MONOCLE ? 0 : d->window_gap);
if (n->client->pseudo_tiled) {
/* pseudo-tiled clients */
r = n->client->floating_rectangle;
if (center_pseudo_tiled) {
r.x = rect.x - bw + (rect.width - wg - r.width) / 2;
r.y = rect.y - bw + (rect.height - wg - r.height) / 2;
} else {
r.x = rect.x;
r.y = rect.y;
}
} else {
/* tiled clients */
r = rect;
int bleed = wg + 2 * bw;
r.width = (bleed < r.width ? r.width - bleed : 1);
r.height = (bleed < r.height ? r.height - bleed : 1);
}
n->client->tiled_rectangle = r;
} else {
/* floating clients */
r = n->client->floating_rectangle;
}
} else {
/* fullscreen clients */
r = m->rectangle;
}
window_move_resize(n->client->window, r.x, r.y, r.width, r.height);
window_border_width(n->client->window, bw);
window_draw_border(n, d->focus == n, m == mon);
if (pointer_follows_focus && mon->desk->focus == n && frozen_pointer->action == ACTION_NONE) {
center_pointer(r);
}
} else {
xcb_rectangle_t first_rect;
xcb_rectangle_t second_rect;
if (d->layout == LAYOUT_MONOCLE || n->first_child->vacant || n->second_child->vacant) {
first_rect = second_rect = rect;
} else {
unsigned int fence;
if (n->split_type == TYPE_VERTICAL) {
fence = rect.width * n->split_ratio;
first_rect = (xcb_rectangle_t) {rect.x, rect.y, fence, rect.height};
second_rect = (xcb_rectangle_t) {rect.x + fence, rect.y, rect.width - fence, rect.height};
} else {
fence = rect.height * n->split_ratio;
first_rect = (xcb_rectangle_t) {rect.x, rect.y, rect.width, fence};
second_rect = (xcb_rectangle_t) {rect.x, rect.y + fence, rect.width, rect.height - fence};
}
}
apply_layout(m, d, n->first_child, first_rect, root_rect);
apply_layout(m, d, n->second_child, second_rect, root_rect);
}
}
void insert_node(monitor_t *m, desktop_t *d, node_t *n, node_t *f)
{
if (d == NULL || n == NULL)
return;
PRINTF("insert node %X\n", n->client->window);
/* n: new leaf node */
/* c: new container node */
/* f: focus or insertion anchor */
/* p: parent of focus */
/* g: grand parent of focus */
if (f == NULL)
f = d->root;
if (f == NULL) {
d->root = n;
} else {
node_t *c = make_node();
node_t *p = f->parent;
if ((f->client->private ||
(p != NULL && p->privacy_level > 0)) &&
f->split_mode == MODE_AUTOMATIC) {
node_t *closest = NULL;
node_t *public = NULL;
closest_public(d, f, &closest, &public);
if (public != NULL) {
f = public;
p = f->parent;
} else {
if (closest != NULL) {
f = closest;
p = f->parent;
}
f->split_mode = MODE_MANUAL;
xcb_rectangle_t rect = f->client->tiled_rectangle;
f->split_dir = (rect.width >= rect.height ? DIR_LEFT : DIR_UP);
if (f->client->private) {
get_opposite(f->split_dir, &f->split_dir);
update_privacy_level(f, false);
}
}
}
if (p != NULL && f->split_mode == MODE_AUTOMATIC &&
(p->first_child->vacant || p->second_child->vacant)) {
f = p;
p = f->parent;
}
n->parent = c;
c->birth_rotation = f->birth_rotation;
switch (f->split_mode) {
case MODE_AUTOMATIC:
if (p == NULL) {
if (initial_polarity == FIRST_CHILD) {
c->first_child = n;
c->second_child = f;
} else {
c->first_child = f;
c->second_child = n;
}
if (m->rectangle.width > m->rectangle.height)
c->split_type = TYPE_VERTICAL;
else
c->split_type = TYPE_HORIZONTAL;
f->parent = c;
d->root = c;
} else {
node_t *g = p->parent;
c->parent = g;
if (g != NULL) {
if (is_first_child(p))
g->first_child = c;
else
g->second_child = c;
} else {
d->root = c;
}
c->split_type = p->split_type;
c->split_ratio = p->split_ratio;
p->parent = c;
int rot;
if (is_first_child(f)) {
c->first_child = n;
c->second_child = p;
rot = 90;
} else {
c->first_child = p;
c->second_child = n;
rot = 270;
}
if (!is_floating(n->client))
rotate_tree(p, rot);
n->birth_rotation = rot;
}
break;
case MODE_MANUAL:
if (p != NULL) {
if (is_first_child(f))
p->first_child = c;
else
p->second_child = c;
}
c->split_ratio = f->split_ratio;
c->parent = p;
f->parent = c;
f->birth_rotation = 0;
switch (f->split_dir) {
case DIR_LEFT:
c->split_type = TYPE_VERTICAL;
c->first_child = n;
c->second_child = f;
break;
case DIR_RIGHT:
c->split_type = TYPE_VERTICAL;
c->first_child = f;
c->second_child = n;
break;
case DIR_UP:
c->split_type = TYPE_HORIZONTAL;
c->first_child = n;
c->second_child = f;
break;
case DIR_DOWN:
c->split_type = TYPE_HORIZONTAL;
c->first_child = f;
c->second_child = n;
break;
}
if (d->root == f)
d->root = c;
f->split_mode = MODE_AUTOMATIC;
break;
}
if (f->vacant)
update_vacant_state(f->parent);
if (f->client != NULL && f->client->private)
update_privacy_level(f, true);
}
if (n->client->private)
update_privacy_level(n, true);
if (d->focus == NULL)
d->focus = n;
if (n->client->sticky)
m->num_sticky++;
put_status();
}
void pseudo_focus(monitor_t *m, desktop_t *d, node_t *n)
{
if (n != NULL) {
stack(n, STACK_ABOVE);
if (d->focus != n) {
window_draw_border(d->focus, false, m == mon);
window_draw_border(n, true, m == mon);
}
}
d->focus = n;
}
void focus_node(monitor_t *m, desktop_t *d, node_t *n)
{
if (mon->desk != d || n == NULL)
clear_input_focus();
if (m->num_sticky > 0 && d != m->desk) {
node_t *a = first_extrema(m->desk->root);
sticky_still = false;
while (a != NULL) {
node_t *b = next_leaf(a, m->desk->root);
if (a->client->sticky)
transfer_node(m, m->desk, a, m, d, d->focus);
a = b;
}
sticky_still = true;
if (n == NULL && d->focus != NULL)
n = d->focus;
}
if (n != NULL) {
if (d->focus != NULL && n != d->focus && d->focus->client->fullscreen) {
set_fullscreen(d->focus, false);
arrange(m, d);
}
if (n->client->urgent) {
n->client->urgent = false;
put_status();
}
}
if (mon != m) {
for (desktop_t *cd = mon->desk_head; cd != NULL; cd = cd->next)
window_draw_border(cd->focus, true, false);
for (desktop_t *cd = m->desk_head; cd != NULL; cd = cd->next)
if (cd != d)
window_draw_border(cd->focus, true, true);
if (d->focus == n)
window_draw_border(n, true, true);
}
if (d->focus != n) {
window_draw_border(d->focus, false, true);
window_draw_border(n, true, true);
}
focus_desktop(m, d);
d->focus = n;
if (n == NULL) {
history_add(m, d, NULL);
ewmh_update_active_window();
return;
} else {
stack(n, STACK_ABOVE);
}
PRINTF("focus node %X\n", n->client->window);
history_add(m, d, n);
set_input_focus(n);
if (focus_follows_pointer) {
xcb_window_t win = XCB_NONE;
query_pointer(&win, NULL);
if (win != n->client->window)
enable_motion_recorder();
else
disable_motion_recorder();
}
if (pointer_follows_focus) {
center_pointer(get_rectangle(n->client));
}
ewmh_update_active_window();
}
void update_current(void)
{
focus_node(mon, mon->desk, mon->desk->focus);
}
node_t *make_node(void)
{
node_t *n = malloc(sizeof(node_t));
n->parent = n->first_child = n->second_child = NULL;
n->split_ratio = split_ratio;
n->split_mode = MODE_AUTOMATIC;
n->split_type = TYPE_VERTICAL;
n->birth_rotation = 0;
n->privacy_level = 0;
n->client = NULL;
n->vacant = false;
return n;
}
client_t *make_client(xcb_window_t win, unsigned int border_width)
{
client_t *c = malloc(sizeof(client_t));
c->window = win;
snprintf(c->class_name, sizeof(c->class_name), "%s", MISSING_VALUE);
snprintf(c->instance_name, sizeof(c->instance_name), "%s", MISSING_VALUE);
c->border_width = border_width;
c->pseudo_tiled = c->floating = c->fullscreen = false;
c->locked = c->sticky = c->urgent = c->private = c->icccm_focus = false;
xcb_icccm_get_wm_protocols_reply_t protocols;
if (xcb_icccm_get_wm_protocols_reply(dpy, xcb_icccm_get_wm_protocols(dpy, win, ewmh->WM_PROTOCOLS), &protocols, NULL) == 1) {
if (has_proto(WM_TAKE_FOCUS, &protocols))
c->icccm_focus = true;
xcb_icccm_get_wm_protocols_reply_wipe(&protocols);
}
c->num_states = 0;
xcb_ewmh_get_atoms_reply_t wm_state;
if (xcb_ewmh_get_wm_state_reply(ewmh, xcb_ewmh_get_wm_state(ewmh, win), &wm_state, NULL) == 1) {
for (unsigned int i = 0; i < wm_state.atoms_len && i < MAX_STATE; i++)
ewmh_wm_state_add(c, wm_state.atoms[i]);
xcb_ewmh_get_atoms_reply_wipe(&wm_state);
}
return c;
}
bool is_leaf(node_t *n)
{
return (n != NULL && n->first_child == NULL && n->second_child == NULL);
}
bool is_tiled(client_t *c)
{
if (c == NULL)
return false;
return (!c->floating && !c->fullscreen);
}
bool is_floating(client_t *c)
{
if (c == NULL)
return false;
return (c->floating && !c->fullscreen);
}
bool is_first_child(node_t *n)
{
return (n != NULL && n->parent != NULL && n->parent->first_child == n);
}
bool is_second_child(node_t *n)
{
return (n != NULL && n->parent != NULL && n->parent->second_child == n);
}
void reset_mode(coordinates_t *loc)
{
if (loc->node != NULL) {
loc->node->split_mode = MODE_AUTOMATIC;
window_draw_border(loc->node, loc->desktop->focus == loc->node, mon == loc->monitor);
} else if (loc->desktop != NULL) {
for (node_t *a = first_extrema(loc->desktop->root); a != NULL; a = next_leaf(a, loc->desktop->root)) {
a->split_mode = MODE_AUTOMATIC;
window_draw_border(a, loc->desktop->focus == a, mon == loc->monitor);
}
}
}
node_t *brother_tree(node_t *n)
{
if (n == NULL || n->parent == NULL)
return NULL;
if (is_first_child(n))
return n->parent->second_child;
else
return n->parent->first_child;
}
void closest_public(desktop_t *d, node_t *n, node_t **closest, node_t **public)
{
if (n == NULL)
return;
node_t *prev = prev_leaf(n, d->root);
node_t *next = next_leaf(n, d->root);
while (prev != NULL || next != NULL) {
#define TESTLOOP(n) \
if (n != NULL) { \
if (is_tiled(n->client)) { \
if (n->privacy_level == 0) { \
if (n->parent == NULL || n->parent->privacy_level == 0) { \
*public = n; \
return; \
} else if (*closest == NULL) { \
*closest = n; \
} \
} \
} \
n = n##_leaf(n, d->root); \
}
TESTLOOP(prev)
TESTLOOP(next)
#undef TESTLOOP
}
}
node_t *first_extrema(node_t *n)
{
if (n == NULL)
return NULL;
else if (n->first_child == NULL)
return n;
else
return first_extrema(n->first_child);
}
node_t *second_extrema(node_t *n)
{
if (n == NULL)
return NULL;
else if (n->second_child == NULL)
return n;
else
return second_extrema(n->second_child);
}
node_t *next_leaf(node_t *n, node_t *r)
{
if (n == NULL)
return NULL;
node_t *p = n;
while (is_second_child(p) && p != r)
p = p->parent;
if (p == r)
return NULL;
return first_extrema(p->parent->second_child);
}
node_t *prev_leaf(node_t *n, node_t *r)
{
if (n == NULL)
return NULL;
node_t *p = n;
while (is_first_child(p) && p != r)
p = p->parent;
if (p == r)
return NULL;
return second_extrema(p->parent->first_child);
}
node_t *next_tiled_leaf(desktop_t *d, node_t *n, node_t *r)
{
node_t *next = next_leaf(n, r);
if (next == NULL || is_tiled(next->client))
return next;
else
return next_tiled_leaf(d, next, r);
}
node_t *prev_tiled_leaf(desktop_t *d, node_t *n, node_t *r)
{
node_t *prev = prev_leaf(n, r);
if (prev == NULL || is_tiled(prev->client))
return prev;
else
return prev_tiled_leaf(d, prev, r);
}
/* bool is_adjacent(node_t *a, node_t *r) */
/* { */
/* node_t *f = r->parent; */
/* node_t *p = a; */
/* bool first_child = is_first_child(r); */
/* while (p != r) { */
/* if (p->parent->split_type == f->split_type && is_first_child(p) == first_child) */
/* return false; */
/* p = p->parent; */
/* } */
/* return true; */
/* } */
/* Returns true if *b* is adjacent to *a* in the direction *dir* */
bool is_adjacent(node_t *a, node_t *b, direction_t dir)
{
switch (dir) {
case DIR_RIGHT:
return (a->rectangle.x + a->rectangle.width) == b->rectangle.x;
break;
case DIR_DOWN:
return (a->rectangle.y + a->rectangle.height) == b->rectangle.y;
break;
case DIR_LEFT:
return (b->rectangle.x + b->rectangle.width) == a->rectangle.x;
break;
case DIR_UP:
return (b->rectangle.y + b->rectangle.height) == a->rectangle.y;
break;
}
return false;
}
node_t *find_fence(node_t *n, direction_t dir)
{
node_t *p;
if (n == NULL)
return NULL;
p = n->parent;
while (p != NULL) {
if ((dir == DIR_UP && p->split_type == TYPE_HORIZONTAL && p->rectangle.y < n->rectangle.y) ||
(dir == DIR_LEFT && p->split_type == TYPE_VERTICAL && p->rectangle.x < n->rectangle.x) ||
(dir == DIR_DOWN && p->split_type == TYPE_HORIZONTAL && (p->rectangle.y + p->rectangle.height) > (n->rectangle.y + n->rectangle.height)) ||
(dir == DIR_RIGHT && p->split_type == TYPE_VERTICAL && (p->rectangle.x + p->rectangle.width) > (n->rectangle.x + n->rectangle.width)))
return p;
p = p->parent;
}
return NULL;
}
node_t *nearest_neighbor(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, client_select_t sel)
{
if (n == NULL || n->client->fullscreen ||
(d->layout == LAYOUT_MONOCLE && is_tiled(n->client)))
return NULL;
node_t *nearest = NULL;
if (history_aware_focus)
nearest = nearest_from_history(m, d, n, dir, sel);
if (nearest == NULL) {
if (focus_by_distance) {
nearest = nearest_from_distance(m, d, n, dir, sel);
} else {
nearest = nearest_from_tree(m, d, n, dir, sel);
}
}
return nearest;
}
node_t *nearest_from_tree(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, client_select_t sel)
{
if (n == NULL)
return NULL;
node_t *fence = find_fence(n, dir);
if (fence == NULL)
return NULL;
node_t *nearest = NULL;
if (dir == DIR_UP || dir == DIR_LEFT)
nearest = second_extrema(fence->first_child);
else if (dir == DIR_DOWN || dir == DIR_RIGHT)
nearest = first_extrema(fence->second_child);
coordinates_t ref = {m, d, n};
coordinates_t loc = {m, d, nearest};
if (node_matches(&loc, &ref, sel))
return nearest;
else
return NULL;
}
node_t *nearest_from_history(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, client_select_t sel)
{
if (n == NULL || !is_tiled(n->client))
return NULL;
node_t *target = find_fence(n, dir);
if (target == NULL)
return NULL;
if (dir == DIR_UP || dir == DIR_LEFT)
target = target->first_child;
else if (dir == DIR_DOWN || dir == DIR_RIGHT)
target = target->second_child;
node_t *nearest = NULL;
int min_rank = INT_MAX;
coordinates_t ref = {m, d, n};
for (node_t *a = first_extrema(target); a != NULL; a = next_leaf(a, target)) {
if (a->vacant || !is_adjacent(n, a, dir) || a == n)
continue;
coordinates_t loc = {m, d, a};
if (!node_matches(&loc, &ref, sel))
continue;
int rank = history_rank(d, a);
if (rank >= 0 && rank < min_rank) {
nearest = a;
min_rank = rank;
}
}
return nearest;
}
node_t *nearest_from_distance(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, client_select_t sel)
{
if (n == NULL)
return NULL;
node_t *target = NULL;
if (is_tiled(n->client)) {
target = find_fence(n, dir);
if (target == NULL)
return NULL;
if (dir == DIR_UP || dir == DIR_LEFT)
target = target->first_child;
else if (dir == DIR_DOWN || dir == DIR_RIGHT)
target = target->second_child;
} else {
target = d->root;
}
node_t *nearest = NULL;
direction_t dir2;
xcb_point_t pt;
xcb_point_t pt2;
get_side_handle(n->client, dir, &pt);
get_opposite(dir, &dir2);
double ds = DBL_MAX;
coordinates_t ref = {m, d, n};
for (node_t *a = first_extrema(target); a != NULL; a = next_leaf(a, target)) {
coordinates_t loc = {m, d, a};
if (a == n ||
!node_matches(&loc, &ref, sel) ||
is_tiled(a->client) != is_tiled(n->client) ||
(is_tiled(a->client) && !is_adjacent(n, a, dir)))
continue;
get_side_handle(a->client, dir2, &pt2);
double ds2 = distance(pt, pt2);
if (ds2 < ds) {
ds = ds2;
nearest = a;
}
}
return nearest;
}
void get_opposite(direction_t src, direction_t *dst)
{
switch (src) {
case DIR_RIGHT:
*dst = DIR_LEFT;
break;
case DIR_DOWN:
*dst = DIR_UP;
break;
case DIR_LEFT:
*dst = DIR_RIGHT;
break;
case DIR_UP:
*dst = DIR_DOWN;
break;
}
}
int tiled_area(node_t *n)
{
if (n == NULL)
return -1;
xcb_rectangle_t rect = n->client->tiled_rectangle;
return rect.width * rect.height;
}
node_t *find_biggest(monitor_t *m, desktop_t *d, node_t *n, client_select_t sel)
{
if (d == NULL)
return NULL;
node_t *r = NULL;
int r_area = tiled_area(r);
coordinates_t ref = {m, d, n};
for (node_t *f = first_extrema(d->root); f != NULL; f = next_leaf(f, d->root)) {
coordinates_t loc = {m, d, f};
if (!is_tiled(f->client) || !node_matches(&loc, &ref, sel))
continue;
int f_area = tiled_area(f);
if (r == NULL) {
r = f;
r_area = f_area;
} else if (f_area > r_area) {
r = f;
r_area = f_area;
}
}
return r;
}
void rotate_tree(node_t *n, int deg)
{
if (n == NULL || is_leaf(n) || deg == 0)
return;
node_t *tmp;
if ((deg == 90 && n->split_type == TYPE_HORIZONTAL) ||
(deg == 270 && n->split_type == TYPE_VERTICAL) ||
deg == 180) {
tmp = n->first_child;
n->first_child = n->second_child;
n->second_child = tmp;
n->split_ratio = 1.0 - n->split_ratio;
}
if (deg != 180) {
if (n->split_type == TYPE_HORIZONTAL)
n->split_type = TYPE_VERTICAL;
else if (n->split_type == TYPE_VERTICAL)
n->split_type = TYPE_HORIZONTAL;
}
rotate_tree(n->first_child, deg);
rotate_tree(n->second_child, deg);
}
void rotate_brother(node_t *n)
{
rotate_tree(brother_tree(n), n->birth_rotation);
}
void unrotate_tree(node_t *n, int rot)
{
if (rot == 0)
return;
rotate_tree(n, 360 - rot);
}
void unrotate_brother(node_t *n)
{
unrotate_tree(brother_tree(n), n->birth_rotation);
}
void flip_tree(node_t *n, flip_t flp)
{
if (n == NULL || is_leaf(n))
return;
node_t *tmp;
if ((flp == FLIP_HORIZONTAL && n->split_type == TYPE_HORIZONTAL) ||
(flp == FLIP_VERTICAL && n->split_type == TYPE_VERTICAL)) {
tmp = n->first_child;
n->first_child = n->second_child;
n->second_child = tmp;
n->split_ratio = 1.0 - n->split_ratio;
}
flip_tree(n->first_child, flp);
flip_tree(n->second_child, flp);
}
void equalize_tree(node_t *n)
{
if (n == NULL || n->vacant) {
return;
} else {
n->split_ratio = split_ratio;
equalize_tree(n->first_child);
equalize_tree(n->second_child);
}
}
int balance_tree(node_t *n)
{
if (n == NULL || n->vacant) {
return 0;
} else if (is_leaf(n)) {
return 1;
} else {
int b1 = balance_tree(n->first_child);
int b2 = balance_tree(n->second_child);
int b = b1 + b2;
if (b1 > 0 && b2 > 0)
n->split_ratio = (double) b1 / b;
return b;
}
}
void unlink_node(monitor_t *m, desktop_t *d, node_t *n)
{
if (d == NULL || n == NULL)
return;
PRINTF("unlink node %X\n", n->client->window);
node_t *p = n->parent;
if (p == NULL) {
d->root = NULL;
d->focus = NULL;
} else {
if (n->client->private)
update_privacy_level(n, false);
node_t *b;
node_t *g = p->parent;
if (is_first_child(n)) {
b = p->second_child;
if (!n->vacant)
unrotate_tree(b, n->birth_rotation);
} else {
b = p->first_child;
if (!n->vacant)
unrotate_tree(b, n->birth_rotation);
}
b->parent = g;
if (g != NULL) {
if (is_first_child(p))
g->first_child = b;
else
g->second_child = b;
} else {
d->root = b;
}
b->birth_rotation = p->birth_rotation;
n->parent = NULL;
free(p);
update_vacant_state(b->parent);
if (n == d->focus) {
d->focus = history_get_node(d, n);
// fallback to the first extrema (`n` is not reachable)
if (d->focus == NULL)
d->focus = first_extrema(d->root);
}
}
if (n->client->sticky)
m->num_sticky--;
put_status();
}
void remove_node(monitor_t *m, desktop_t *d, node_t *n)
{
if (n == NULL)
return;
PRINTF("remove node %X\n", n->client->window);
bool focused = (n == mon->desk->focus);
unlink_node(m, d, n);
history_remove(d, n);
remove_stack_node(n);
free(n->client);
free(n);
num_clients--;
ewmh_update_client_list();
if (focused)
update_current();
}
void destroy_tree(node_t *n)
{
if (n == NULL)
return;
node_t *first_tree = n->first_child;
node_t *second_tree = n->second_child;
if (n->client != NULL) {
free(n->client);
num_clients--;
}
free(n);
destroy_tree(first_tree);
destroy_tree(second_tree);
}
bool swap_nodes(monitor_t *m1, desktop_t *d1, node_t *n1, monitor_t *m2, desktop_t *d2, node_t *n2)
{
if (n1 == NULL || n2 == NULL ||n1 == n2 ||
(d1 != d2 && (n1->client->sticky || n2->client->sticky)))
return false;
PRINTF("swap nodes %X %X\n", n1->client->window, n2->client->window);
node_t *pn1 = n1->parent;
node_t *pn2 = n2->parent;
bool n1_first_child = is_first_child(n1);
bool n2_first_child = is_first_child(n2);
int br1 = n1->birth_rotation;
int br2 = n2->birth_rotation;
int pl1 = n1->privacy_level;
int pl2 = n2->privacy_level;
if (pn1 != NULL) {
if (n1_first_child)
pn1->first_child = n2;
else
pn1->second_child = n2;
}
if (pn2 != NULL) {
if (n2_first_child)
pn2->first_child = n1;
else