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tree.c
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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 <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#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 "geometry.h"
#include "subscribe.h"
#include "settings.h"
#include "pointer.h"
#include "stack.h"
#include "window.h"
#include "tree.h"
void arrange(monitor_t *m, desktop_t *d)
{
if (d->root == NULL) {
return;
}
layout_t last_layout = d->layout;
if (single_monocle && tiled_count(d->root) == 1) {
d->layout = LAYOUT_MONOCLE;
}
xcb_rectangle_t rect = m->rectangle;
if (!paddingless_monocle || d->layout != LAYOUT_MONOCLE) {
rect.x += m->padding.left + d->padding.left;
rect.y += m->padding.top + d->padding.top;
rect.width -= m->padding.left + d->padding.left + d->padding.right + m->padding.right;
rect.height -= m->padding.top + d->padding.top + d->padding.bottom + m->padding.bottom;
}
if (!gapless_monocle || d->layout != LAYOUT_MONOCLE) {
rect.x += d->window_gap;
rect.y += d->window_gap;
rect.width -= d->window_gap;
rect.height -= d->window_gap;
}
if (focus_follows_pointer) {
listen_enter_notify(d->root, false);
}
apply_layout(m, d, d->root, rect, rect);
if (focus_follows_pointer) {
listen_enter_notify(d->root, true);
}
d->layout = last_layout;
}
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 (pointer_follows_focus && mon->desk->focus == n) {
xcb_rectangle_t r = rect;
r.width -= d->window_gap;
r.height -= d->window_gap;
center_pointer(r);
}
if (n->presel != NULL) {
draw_presel_feedback(m, d, n);
}
if (is_leaf(n)) {
if (n->client == NULL) {
return;
}
unsigned int bw;
if ((borderless_monocle && n->client->state == STATE_TILED && d->layout == LAYOUT_MONOCLE)
|| n->client->state == STATE_FULLSCREEN) {
bw = 0;
} else {
bw = n->client->border_width;
}
xcb_rectangle_t r;
xcb_rectangle_t cr = get_window_rectangle(n);
client_state_t s = n->client->state;
if (s == STATE_TILED || s == STATE_PSEUDO_TILED) {
int wg = (gapless_monocle && d->layout == LAYOUT_MONOCLE ? 0 : d->window_gap);
/* tiled clients */
if (s == STATE_TILED) {
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);
/* pseudo-tiled clients */
} else {
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;
}
}
n->client->tiled_rectangle = r;
/* floating clients */
} else if (s == STATE_FLOATING) {
r = n->client->floating_rectangle;
/* fullscreen clients */
} else {
r = m->rectangle;
n->client->tiled_rectangle = r;
}
apply_size_hints(n->client, &r.width, &r.height);
if (!rect_eq(r, cr)) {
window_move_resize(n->id, r.x, r.y, r.width, r.height);
if (!grabbing) {
put_status(SBSC_MASK_NODE_GEOMETRY, "node_geometry 0x%08X 0x%08X 0x%08X %ux%u+%i+%i\n", m->id, d->id, n->id, r.width, r.height, r.x, r.y);
}
}
window_border_width(n->id, bw);
} 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);
}
}
presel_t *make_presel(void)
{
presel_t *p = malloc(sizeof(presel_t));
p->split_dir = DIR_EAST;
p->split_ratio = split_ratio;
p->feedback = XCB_NONE;
return p;
}
void set_ratio(node_t *n, double rat)
{
if (n == NULL) {
return;
}
n->split_ratio = rat;
}
void presel_dir(monitor_t *m, desktop_t *d, node_t *n, direction_t dir)
{
if (n->presel == NULL) {
n->presel = make_presel();
}
n->presel->split_dir = dir;
put_status(SBSC_MASK_NODE_PRESEL, "node_presel 0x%08X 0x%08X 0x%08X dir %s\n", m->id, d->id, n->id, SPLIT_DIR_STR(dir));
}
void presel_ratio(monitor_t *m, desktop_t *d, node_t *n, double ratio)
{
if (n->presel == NULL) {
n->presel = make_presel();
}
n->presel->split_ratio = ratio;
put_status(SBSC_MASK_NODE_PRESEL, "node_presel 0x%08X 0x%08X 0x%08X ratio %lf\n", m->id, d->id, n->id, ratio);
}
void cancel_presel(monitor_t *m, desktop_t *d, node_t *n)
{
if (n->presel == NULL) {
return;
}
if (n->presel->feedback != XCB_NONE) {
xcb_destroy_window(dpy, n->presel->feedback);
}
free(n->presel);
n->presel = NULL;
put_status(SBSC_MASK_NODE_PRESEL, "node_presel 0x%08X 0x%08X 0x%08X cancel\n", m->id, d->id, n->id);
}
node_t *find_public(desktop_t *d)
{
unsigned int b_manual_area = 0;
unsigned int b_automatic_area = 0;
node_t *b_manual = NULL;
node_t *b_automatic = NULL;
for (node_t *n = first_extrema(d->root); n != NULL; n = next_leaf(n, d->root)) {
if (n->vacant) {
continue;
}
unsigned int n_area = node_area(d, n);
if (n_area > b_manual_area && (n->presel != NULL || !n->private)) {
b_manual = n;
b_manual_area = n_area;
}
if (n_area > b_automatic_area &&
n->presel == NULL && !n->private && private_count(n->parent) == 0) {
b_automatic = n;
b_automatic_area = n_area;
}
}
if (b_automatic != NULL) {
return b_automatic;
} else {
return b_manual;
}
}
node_t *insert_node(monitor_t *m, desktop_t *d, node_t *n, node_t *f)
{
if (d == NULL || n == NULL) {
return NULL;
}
/* n: inserted node */
/* c: new internal 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 if (IS_RECEPTACLE(f) && f->presel == NULL) {
node_t *p = f->parent;
if (p != NULL) {
if (is_first_child(f)) {
p->first_child = n;
} else {
p->second_child = n;
}
} else {
d->root = n;
}
n->parent = p;
free(f);
f = NULL;
} else {
node_t *c = make_node(XCB_NONE);
node_t *p = f->parent;
if (f->presel == NULL && (f->private || private_count(f->parent) > 0)) {
node_t *k = find_public(d);
if (k != NULL) {
f = k;
p = f->parent;
}
if (f->presel == NULL && (f->private || private_count(f->parent) > 0)) {
xcb_rectangle_t rect = get_rectangle(d, f);
presel_dir(m, d, f, (rect.width >= rect.height ? DIR_EAST : DIR_SOUTH));
}
}
if (f->presel == NULL && p != NULL && p->vacant) {
f = p;
p = f->parent;
}
n->parent = c;
c->birth_rotation = f->birth_rotation;
if (f->presel == NULL) {
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;
}
n->birth_rotation = rot;
if (!n->vacant) {
rotate_tree(p, rot);
}
}
} else {
if (p != NULL) {
if (is_first_child(f)) {
p->first_child = c;
} else {
p->second_child = c;
}
}
c->split_ratio = f->presel->split_ratio;
c->parent = p;
f->parent = c;
f->birth_rotation = 0;
switch (f->presel->split_dir) {
case DIR_WEST:
c->split_type = TYPE_VERTICAL;
c->first_child = n;
c->second_child = f;
break;
case DIR_EAST:
c->split_type = TYPE_VERTICAL;
c->first_child = f;
c->second_child = n;
break;
case DIR_NORTH:
c->split_type = TYPE_HORIZONTAL;
c->first_child = n;
c->second_child = f;
break;
case DIR_SOUTH:
c->split_type = TYPE_HORIZONTAL;
c->first_child = f;
c->second_child = n;
break;
}
if (d->root == f) {
d->root = c;
}
cancel_presel(m, d, f);
}
}
propagate_flags_upward(m, d, n);
if (d->focus == NULL && is_focusable(n)) {
d->focus = n;
}
return f;
}
void insert_receptacle(monitor_t *m, desktop_t *d, node_t *n)
{
node_t *r = make_node(XCB_NONE);
insert_node(m, d, r, n);
}
bool activate_node(monitor_t *m, desktop_t *d, node_t *n)
{
if (d == mon->desk || (n != NULL && !is_focusable(n))) {
return false;
}
if (n == NULL && d->root != NULL) {
n = history_last_node(d, NULL);
if (n == NULL) {
n = first_focusable_leaf(d->root);
}
}
if (n != NULL) {
if (d->focus != NULL && n != d->focus) {
neutralize_occluding_windows(m, d, n);
}
stack(d, n, true);
if (d->focus != n) {
for (node_t *f = first_extrema(d->focus); f != NULL; f = next_leaf(f, d->focus)) {
if (f->client != NULL && !is_descendant(f, n)) {
window_draw_border(f->id, get_border_color(false, (m == mon)));
}
}
}
draw_border(n, true, (m == mon));
}
d->focus = n;
history_add(m, d, n);
put_status(SBSC_MASK_REPORT);
if (n == NULL) {
return true;
}
put_status(SBSC_MASK_NODE_ACTIVATE, "node_activate 0x%08X 0x%08X 0x%08X\n", m->id, d->id, n->id);
return true;
}
void transfer_sticky_nodes(monitor_t *m, desktop_t *ds, desktop_t *dd, node_t *n)
{
if (n == NULL) {
return;
} else if (n->sticky) {
transfer_node(m, ds, n, m, dd, dd->focus);
} else {
/* we need references to the children because n might be freed after
* the first recursive call */
node_t *first_child = n->first_child;
node_t *second_child = n->second_child;
transfer_sticky_nodes(m, ds, dd, first_child);
transfer_sticky_nodes(m, ds, dd, second_child);
}
}
bool focus_node(monitor_t *m, desktop_t *d, node_t *n)
{
if (n != NULL && !is_focusable(n)) {
return false;
}
if (n == NULL && d->root != NULL) {
n = history_last_node(d, NULL);
if (n == NULL) {
n = first_focusable_leaf(d->root);
}
}
if (mon->desk != d || n == NULL || n->client == NULL) {
clear_input_focus();
}
if (m->sticky_count > 0 && d != m->desk) {
sticky_still = false;
transfer_sticky_nodes(m, m->desk, d, m->desk->root);
sticky_still = true;
if (n == NULL && d->focus != NULL) {
n = d->focus;
}
}
if (d->focus != NULL && n != d->focus) {
neutralize_occluding_windows(m, d, n);
}
if (n != NULL && n->client != NULL && n->client->urgent) {
set_urgent(m, d, n, false);
}
if (mon != m) {
for (desktop_t *e = mon->desk_head; e != NULL; e = e->next) {
draw_border(e->focus, true, false);
}
for (desktop_t *e = m->desk_head; e != NULL; e = e->next) {
if (e == d) {
continue;
}
draw_border(e->focus, true, true);
}
}
if (d->focus != n) {
for (node_t *f = first_extrema(d->focus); f != NULL; f = next_leaf(f, d->focus)) {
if (f->client != NULL && !is_descendant(f, n)) {
window_draw_border(f->id, get_border_color(false, true));
}
}
}
draw_border(n, true, true);
focus_desktop(m, d);
d->focus = n;
ewmh_update_active_window();
history_add(m, d, n);
put_status(SBSC_MASK_REPORT);
if (n == NULL) {
return true;
}
put_status(SBSC_MASK_NODE_FOCUS, "node_focus 0x%08X 0x%08X 0x%08X\n", m->id, d->id, n->id);
stack(d, n, true);
set_input_focus(n);
if (pointer_follows_focus) {
center_pointer(get_rectangle(d, n));
}
return true;
}
void update_focused(void)
{
focus_node(mon, mon->desk, mon->desk->focus);
}
void hide_node(node_t *n)
{
if (n == NULL) {
return;
} else {
if (!n->hidden) {
if (n->presel != NULL) {
window_hide(n->presel->feedback);
}
if (n->client != NULL) {
window_hide(n->id);
}
}
if (n->client != NULL) {
n->client->shown = false;
}
hide_node(n->first_child);
hide_node(n->second_child);
}
}
void show_node(node_t *n)
{
if (n == NULL) {
return;
} else {
if (!n->hidden) {
if (n->client != NULL) {
window_show(n->id);
}
if (n->presel != NULL) {
window_show(n->presel->feedback);
}
}
if (n->client != NULL) {
n->client->shown = true;
}
show_node(n->first_child);
show_node(n->second_child);
}
}
node_t *make_node(uint32_t id)
{
if (id == XCB_NONE) {
id = xcb_generate_id(dpy);
}
node_t *n = malloc(sizeof(node_t));
n->id = id;
n->parent = n->first_child = n->second_child = NULL;
n->vacant = n->hidden = n->sticky = n->private = n->locked = false;
n->split_ratio = split_ratio;
n->split_type = TYPE_VERTICAL;
n->birth_rotation = 0;
n->presel = NULL;
n->client = NULL;
return n;
}
client_t *make_client(void)
{
client_t *c = malloc(sizeof(client_t));
c->state = c->last_state = STATE_TILED;
c->layer = c->last_layer = LAYER_NORMAL;
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->urgent = false;
c->shown = false;
c->wm_flags = 0;
c->icccm_props.input_hint = true;
c->icccm_props.take_focus = false;
c->size_hints.flags = 0;
return c;
}
void initialize_client(node_t *n)
{
xcb_window_t win = n->id;
client_t *c = n->client;
xcb_icccm_get_wm_protocols_reply_t protos;
if (xcb_icccm_get_wm_protocols_reply(dpy, xcb_icccm_get_wm_protocols(dpy, win, ewmh->WM_PROTOCOLS), &protos, NULL) == 1) {
if (has_proto(WM_TAKE_FOCUS, &protos)) {
c->icccm_props.take_focus = true;
}
xcb_icccm_get_wm_protocols_reply_wipe(&protos);
}
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_WM_STATES; i++) {
#define HANDLE_WM_STATE(s) \
if (wm_state.atoms[i] == ewmh->_NET_WM_STATE_##s) { \
c->wm_flags |= WM_FLAG_##s; continue; \
}
HANDLE_WM_STATE(MODAL)
HANDLE_WM_STATE(STICKY)
HANDLE_WM_STATE(MAXIMIZED_VERT)
HANDLE_WM_STATE(MAXIMIZED_HORZ)
HANDLE_WM_STATE(SHADED)
HANDLE_WM_STATE(SKIP_TASKBAR)
HANDLE_WM_STATE(SKIP_PAGER)
HANDLE_WM_STATE(HIDDEN)
HANDLE_WM_STATE(FULLSCREEN)
HANDLE_WM_STATE(ABOVE)
HANDLE_WM_STATE(BELOW)
HANDLE_WM_STATE(DEMANDS_ATTENTION)
#undef HANDLE_WM_STATE
}
xcb_ewmh_get_atoms_reply_wipe(&wm_state);
}
xcb_icccm_wm_hints_t hints;
if (xcb_icccm_get_wm_hints_reply(dpy, xcb_icccm_get_wm_hints(dpy, win), &hints, NULL) == 1
&& (hints.flags & XCB_ICCCM_WM_HINT_INPUT)) {
c->icccm_props.input_hint = hints.input;
}
xcb_icccm_get_wm_normal_hints_reply(dpy, xcb_icccm_get_wm_normal_hints(dpy, win), &c->size_hints, NULL);
}
bool is_focusable(node_t *n)
{
for (node_t *f = first_extrema(n); f != NULL; f = next_leaf(f, n)) {
if (f->client != NULL && !f->hidden) {
return true;
}
}
return false;
}
bool is_leaf(node_t *n)
{
return (n != NULL && n->first_child == NULL && n->second_child == NULL);
}
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);
}
unsigned int clients_count_in(node_t *n)
{
if (n == NULL) {
return 0;
} else {
return (n->client != NULL ? 1 : 0) +
clients_count_in(n->first_child) +
clients_count_in(n->second_child);
}
}
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;
}
}
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 *first_focusable_leaf(node_t *n)
{
for (node_t *f = first_extrema(n); f != NULL; f = next_leaf(f, n)) {
if (f->client != NULL && !f->hidden) {
return f;
}
}
return NULL;
}
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(node_t *n, node_t *r)
{
node_t *next = next_leaf(n, r);
if (next == NULL || (next->client != NULL && !next->vacant)) {
return next;
} else {
return next_tiled_leaf(next, r);
}
}
node_t *prev_tiled_leaf(node_t *n, node_t *r)
{
node_t *prev = prev_leaf(n, r);
if (prev == NULL || (prev->client != NULL && !prev->vacant)) {
return prev;
} else {
return prev_tiled_leaf(prev, r);
}
}
/* 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_EAST:
return (a->rectangle.x + a->rectangle.width) == b->rectangle.x;
break;
case DIR_SOUTH:
return (a->rectangle.y + a->rectangle.height) == b->rectangle.y;
break;
case DIR_WEST:
return (b->rectangle.x + b->rectangle.width) == a->rectangle.x;
break;
case DIR_NORTH:
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_NORTH && p->split_type == TYPE_HORIZONTAL && p->rectangle.y < n->rectangle.y) ||
(dir == DIR_WEST && p->split_type == TYPE_VERTICAL && p->rectangle.x < n->rectangle.x) ||
(dir == DIR_SOUTH && p->split_type == TYPE_HORIZONTAL && (p->rectangle.y + p->rectangle.height) > (n->rectangle.y + n->rectangle.height)) ||
(dir == DIR_EAST && 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, node_select_t sel)
{
if (n == NULL || (n->client != NULL && IS_FULLSCREEN(n->client)) ||
(d->layout == LAYOUT_MONOCLE && (n->client != NULL && 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;
}
/* returns *true* if *a* is a child of *b* */
bool is_child(node_t *a, node_t *b)
{
if (a == NULL || b == NULL) {
return false;
}
return (a->parent != NULL && a->parent == b);
}
/* returns *true* if *a* is a descendant of *b* */
bool is_descendant(node_t *a, node_t *b)
{
if (a == NULL || b == NULL) {
return false;
}
while (a != b && a != NULL) {
a = a->parent;
}
return a == b;
}
bool find_by_id(uint32_t id, coordinates_t *loc)
{
for (monitor_t *m = mon_head; m != NULL; m = m->next) {
for (desktop_t *d = m->desk_head; d != NULL; d = d->next) {
node_t *n = find_by_id_in(d->root, id);
if (n != NULL) {
loc->monitor = m;
loc->desktop = d;
loc->node = n;
return true;
}
}
}
return false;
}
node_t *find_by_id_in(node_t *r, uint32_t id)
{
if (r == NULL) {
return NULL;
} else if (r->id == id) {
return r;
} else {
node_t *f = find_by_id_in(r->first_child, id);
if (f != NULL) {
return f;
} else {
return find_by_id_in(r->second_child, id);
}
}
}
node_t *nearest_from_tree(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, node_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_NORTH || dir == DIR_WEST) {
nearest = second_extrema(fence->first_child);
} else if (dir == DIR_SOUTH || dir == DIR_EAST) {
nearest = first_extrema(fence->second_child);
}
coordinates_t ref = {m, d, n};
coordinates_t loc = {m, d, nearest};
if (nearest != NULL && (nearest->vacant ||
nearest->client == NULL || !node_matches(&loc, &ref, sel))) {
return NULL;
}
return nearest;
}
node_t *nearest_from_history(monitor_t *m, desktop_t *d, node_t *n, direction_t dir, node_select_t sel)
{
if (n == NULL || (n->client != NULL && !IS_TILED(n->client))) {
return NULL;
}
node_t *target = find_fence(n, dir);
if (target == NULL) {
return NULL;
}
if (dir == DIR_NORTH || dir == DIR_WEST) {
target = target->first_child;
} else if (dir == DIR_SOUTH || dir == DIR_EAST) {
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 || a->client == NULL || !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, node_select_t sel)
{