window.c

/* 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 <stdlib.h>
#include <string.h>
#include "bspwm.h"
#include "ewmh.h"
#include "monitor.h"
#include "query.h"
#include "rule.h"
#include "settings.h"
#include "stack.h"
#include "tree.h"
#include "subscribe.h"
#include "messages.h"
#include "window.h"

void schedule_window(xcb_window_t win)
{
	coordinates_t loc;
	uint8_t override_redirect = 0;
	xcb_get_window_attributes_reply_t *wa = xcb_get_window_attributes_reply(dpy, xcb_get_window_attributes(dpy, win), NULL);

	if (wa != NULL) {
		override_redirect = wa->override_redirect;
		free(wa);
	}

	if (override_redirect || locate_window(win, &loc))
		return;

	/* ignore pending windows */
	for (pending_rule_t *pr = pending_rule_head; pr != NULL; pr = pr->next)
		if (pr->win == win)
			return;

	rule_consequence_t *csq = make_rule_conquence();
	apply_rules(win, csq);
	if (!schedule_rules(win, csq)) {
		manage_window(win, csq, -1);
		free(csq);
	}
}

void manage_window(xcb_window_t win, rule_consequence_t *csq, int fd)
{
	monitor_t *m = mon;
	desktop_t *d = mon->desk;
	node_t *f = mon->desk->focus;

	parse_rule_consequence(fd, csq);

	if (!csq->manage) {
		disable_floating_atom(win);
		window_show(win);
		return;
	}

	PRINTF("manage %X\n", win);
	put_status(SBSC_MASK_WINDOW_MANAGE, "window_manage 0x%X\n", win);

	if (csq->node_desc[0] != '\0') {
		coordinates_t ref = {m, d, f};
		coordinates_t trg = {NULL, NULL, NULL};
		if (node_from_desc(csq->node_desc, &ref, &trg)) {
			m = trg.monitor;
			d = trg.desktop;
			f = trg.node;
		}
	} else if (csq->desktop_desc[0] != '\0') {
		coordinates_t ref = {m, d, NULL};
		coordinates_t trg = {NULL, NULL, NULL};
		if (desktop_from_desc(csq->desktop_desc, &ref, &trg)) {
			m = trg.monitor;
			d = trg.desktop;
			f = trg.desktop->focus;
		}
	} else if (csq->monitor_desc[0] != '\0') {
		coordinates_t ref = {m, NULL, NULL};
		coordinates_t trg = {NULL, NULL, NULL};
		if (monitor_from_desc(csq->monitor_desc, &ref, &trg)) {
			m = trg.monitor;
			d = trg.monitor->desk;
			f = trg.monitor->desk->focus;
		}
	}

	if (csq->sticky) {
		m = mon;
		d = mon->desk;
		f = mon->desk->focus;
	}

	if (csq->split_dir[0] != '\0' && f != NULL) {
		direction_t dir;
		if (parse_direction(csq->split_dir, &dir)) {
			f->split_mode = MODE_MANUAL;
			f->split_dir = dir;
		}
	}

	if (csq->split_ratio != 0 && f != NULL) {
		f->split_ratio = csq->split_ratio;
	}

	client_t *c = make_client(win, csq->border ? d->border_width : 0);
	update_floating_rectangle(c);
	if (c->floating_rectangle.x == 0 && c->floating_rectangle.y == 0)
		csq->center = true;
	c->min_width = csq->min_width;
	c->max_width = csq->max_width;
	c->min_height = csq->min_height;
	c->max_height = csq->max_height;
	monitor_t *mm = monitor_from_client(c);
	embrace_client(mm, c);
	translate_client(mm, m, c);
	if (csq->center)
		window_center(m, c);

	snprintf(c->class_name, sizeof(c->class_name), "%s", csq->class_name);
	snprintf(c->instance_name, sizeof(c->instance_name), "%s", csq->instance_name);

	csq->floating = csq->floating || d->floating;

	node_t *n = make_node();
	n->client = c;

	insert_node(m, d, n, f);

	disable_floating_atom(c->window);
	set_pseudo_tiled(n, csq->pseudo_tiled);
	set_floating(n, csq->floating);
	set_locked(m, d, n, csq->locked);
	set_sticky(m, d, n, csq->sticky);
	set_private(m, d, n, csq->private);

	if (d->focus != NULL && d->focus->client->fullscreen)
		set_fullscreen(d->focus, false);

	set_fullscreen(n, csq->fullscreen);

	arrange(m, d);

	bool give_focus = (csq->focus && (d == mon->desk || csq->follow));

	if (give_focus)
		focus_node(m, d, n);
	else if (csq->focus)
		pseudo_focus(m, d, n);
	else
		stack(n, STACK_ABOVE);

	uint32_t values[] = {CLIENT_EVENT_MASK | (focus_follows_pointer ? XCB_EVENT_MASK_ENTER_WINDOW : 0)};
	xcb_change_window_attributes(dpy, c->window, XCB_CW_EVENT_MASK, values);

	if (visible) {
		if (d == m->desk)
			window_show(n->client->window);
		else
			window_hide(n->client->window);
	}

	/* the same function is already called in `focus_node` but has no effects on unmapped windows */
	if (give_focus)
		xcb_set_input_focus(dpy, XCB_INPUT_FOCUS_POINTER_ROOT, win, XCB_CURRENT_TIME);

	num_clients++;
	ewmh_set_wm_desktop(n, d);
	ewmh_update_client_list();
}

void unmanage_window(xcb_window_t win)
{
	coordinates_t loc;
	if (locate_window(win, &loc)) {
		PRINTF("unmanage %X\n", win);
		put_status(SBSC_MASK_WINDOW_UNMANAGE, "window_unmanage 0x%X\n", win);
		remove_node(loc.monitor, loc.desktop, loc.node);
		if (frozen_pointer->window == win)
			frozen_pointer->action = ACTION_NONE;
		arrange(loc.monitor, loc.desktop);
	} else {
		for (pending_rule_t *pr = pending_rule_head; pr != NULL; pr = pr->next) {
			if (pr->win == win) {
				remove_pending_rule(pr);
				return;
			}
		}
	}
}

void window_draw_border(node_t *n, bool focused_window, bool focused_monitor)
{
	if (n == NULL || n->client->border_width < 1) {
		return;
	}

	xcb_window_t win = n->client->window;
	uint32_t border_color_pxl = get_border_color(n->client, focused_window, focused_monitor);

	if (n->split_mode == MODE_AUTOMATIC) {
		xcb_change_window_attributes(dpy, win, XCB_CW_BORDER_PIXEL, &border_color_pxl);
	} else {
		unsigned int border_width = n->client->border_width;
		uint32_t presel_border_color_pxl;
		get_color(presel_border_color, win, &presel_border_color_pxl);

		xcb_rectangle_t actual_rectangle = get_rectangle(n->client);

		uint16_t width = actual_rectangle.width;
		uint16_t height = actual_rectangle.height;

		uint16_t full_width = width + 2 * border_width;
		uint16_t full_height = height + 2 * border_width;

		xcb_rectangle_t border_rectangles[] =
		{
			{ width, 0, 2 * border_width, height + 2 * border_width },
			{ 0, height, width + 2 * border_width, 2 * border_width }
		};

		xcb_rectangle_t *presel_rectangles;

		uint8_t win_depth = root_depth;
		xcb_get_geometry_reply_t *geo = xcb_get_geometry_reply(dpy, xcb_get_geometry(dpy, win), NULL);
		if (geo != NULL)
			win_depth = geo->depth;
		free(geo);

		xcb_pixmap_t pixmap = xcb_generate_id(dpy);
		xcb_create_pixmap(dpy, win_depth, pixmap, win, full_width, full_height);

		xcb_gcontext_t gc = xcb_generate_id(dpy);
		xcb_create_gc(dpy, gc, pixmap, 0, NULL);

		xcb_change_gc(dpy, gc, XCB_GC_FOREGROUND, &border_color_pxl);
		xcb_poly_fill_rectangle(dpy, pixmap, gc, LENGTH(border_rectangles), border_rectangles);

		uint16_t fence = (int16_t) (n->split_ratio * ((n->split_dir == DIR_UP || n->split_dir == DIR_DOWN) ? height : width));
		presel_rectangles = malloc(2 * sizeof(xcb_rectangle_t));
		switch (n->split_dir) {
			case DIR_UP:
				presel_rectangles[0] = (xcb_rectangle_t) {width, 0, 2 * border_width, fence};
				presel_rectangles[1] = (xcb_rectangle_t) {0, height + border_width, full_width, border_width};
				break;
			case DIR_DOWN:
				presel_rectangles[0] = (xcb_rectangle_t) {width, fence + 1, 2 * border_width, height + border_width - (fence + 1)};
				presel_rectangles[1] = (xcb_rectangle_t) {0, height, full_width, border_width};
				break;
			case DIR_LEFT:
				presel_rectangles[0] = (xcb_rectangle_t) {0, height, fence, 2 * border_width};
				presel_rectangles[1] = (xcb_rectangle_t) {width + border_width, 0, border_width, full_height};
				break;
			case DIR_RIGHT:
				presel_rectangles[0] = (xcb_rectangle_t) {fence + 1, height, width + border_width - (fence + 1), 2 * border_width};
				presel_rectangles[1] = (xcb_rectangle_t) {width, 0, border_width, full_height};
				break;
		}
		xcb_change_gc(dpy, gc, XCB_GC_FOREGROUND, &presel_border_color_pxl);
		xcb_poly_fill_rectangle(dpy, pixmap, gc, 2, presel_rectangles);
		xcb_change_window_attributes(dpy, win, XCB_CW_BORDER_PIXMAP, &pixmap);
		free(presel_rectangles);
		xcb_free_gc(dpy, gc);
		xcb_free_pixmap(dpy, pixmap);
	}
}

pointer_state_t *make_pointer_state(void)
{
	pointer_state_t *p = malloc(sizeof(pointer_state_t));
	p->monitor = NULL;
	p->desktop = NULL;
	p->node = p->vertical_fence = p->horizontal_fence = NULL;
	p->client = NULL;
	p->window = XCB_NONE;
	p->action = ACTION_NONE;
	return p;
}

/* Returns true if a contains b */
bool contains(xcb_rectangle_t a, xcb_rectangle_t b)
{
	return (a.x <= b.x && (a.x + a.width) >= (b.x + b.width) &&
	        a.y <= b.y && (a.y + a.height) >= (b.y + b.height));
}

xcb_rectangle_t get_rectangle(client_t *c)
{
	if (is_tiled(c))
		return c->tiled_rectangle;
	else
		return c->floating_rectangle;
}

void get_side_handle(client_t *c, direction_t dir, xcb_point_t *pt)
{
	xcb_rectangle_t rect = get_rectangle(c);
	switch (dir) {
		case DIR_RIGHT:
			pt->x = rect.x + rect.width;
			pt->y = rect.y + (rect.height / 2);
			break;
		case DIR_DOWN:
			pt->x = rect.x + (rect.width / 2);
			pt->y = rect.y + rect.height;
			break;
		case DIR_LEFT:
			pt->x = rect.x;
			pt->y = rect.y + (rect.height / 2);
			break;
		case DIR_UP:
			pt->x = rect.x + (rect.width / 2);
			pt->y = rect.y;
			break;
	}
}

void adopt_orphans(void)
{
	xcb_query_tree_reply_t *qtr = xcb_query_tree_reply(dpy, xcb_query_tree(dpy, root), NULL);
	if (qtr == NULL)
		return;

	PUTS("adopt orphans");

	int len = xcb_query_tree_children_length(qtr);
	xcb_window_t *wins = xcb_query_tree_children(qtr);
	for (int i = 0; i < len; i++) {
		uint32_t idx;
		xcb_window_t win = wins[i];
		if (xcb_ewmh_get_wm_desktop_reply(ewmh, xcb_ewmh_get_wm_desktop(ewmh, win), &idx, NULL) == 1)
			schedule_window(win);
	}

	free(qtr);
}

void window_close(node_t *n)
{
	if (n == NULL || n->client->locked)
		return;

	PRINTF("close window %X\n", n->client->window);

	send_client_message(n->client->window, ewmh->WM_PROTOCOLS, WM_DELETE_WINDOW);
}

void window_kill(monitor_t *m, desktop_t *d, node_t *n)
{
	if (n == NULL)
		return;

	xcb_window_t win = n->client->window;
	PRINTF("kill window %X\n", win);

	xcb_kill_client(dpy, win);
	remove_node(m, d, n);
}

void set_fullscreen(node_t *n, bool value)
{
	if (n == NULL || n->client->fullscreen == value)
		return;

	client_t *c = n->client;

	PRINTF("fullscreen %X: %s\n", c->window, BOOLSTR(value));
	put_status(SBSC_MASK_WINDOW_FULLSCREEN, "window_fullscreen %s 0x%X\n", ONOFFSTR(value), c->window);

	c->fullscreen = value;
	if (value)
		ewmh_wm_state_add(c, ewmh->_NET_WM_STATE_FULLSCREEN);
	else
		ewmh_wm_state_remove(c, ewmh->_NET_WM_STATE_FULLSCREEN);
	stack(n, STACK_ABOVE);
}

void set_pseudo_tiled(node_t *n, bool value)
{
	if (n == NULL || n->client->pseudo_tiled == value)
		return;

	PRINTF("pseudo-tiled %X: %s\n", n->client->window, BOOLSTR(value));

	n->client->pseudo_tiled = value;
}

void set_floating(node_t *n, bool value)
{
	if (n == NULL || n->client->fullscreen || n->client->floating == value)
		return;

	PRINTF("floating %X: %s\n", n->client->window, BOOLSTR(value));

	n->split_mode = MODE_AUTOMATIC;
	client_t *c = n->client;
	c->floating = n->vacant = value;
	update_vacant_state(n->parent);

	if (value) {
		enable_floating_atom(c->window);
		unrotate_brother(n);
	} else {
		disable_floating_atom(c->window);
		rotate_brother(n);
	}

	stack(n, STACK_ABOVE);
}

void set_locked(monitor_t *m, desktop_t *d, node_t *n, bool value)
{
	if (n == NULL || n->client->locked == value)
		return;

	client_t *c = n->client;

	PRINTF("set locked %X: %s\n", c->window, BOOLSTR(value));

	c->locked = value;
	window_draw_border(n, d->focus == n, m == mon);
}

void set_sticky(monitor_t *m, desktop_t *d, node_t *n, bool value)
{
	if (n == NULL || n->client->sticky == value)
		return;

	client_t *c = n->client;

	PRINTF("set sticky %X: %s\n", c->window, BOOLSTR(value));

	if (d != m->desk)
		transfer_node(m, d, n, m, m->desk, m->desk->focus);

	c->sticky = value;
	if (value) {
		ewmh_wm_state_add(c, ewmh->_NET_WM_STATE_STICKY);
		m->num_sticky++;
	} else {
		ewmh_wm_state_remove(c, ewmh->_NET_WM_STATE_STICKY);
		m->num_sticky--;
	}

	window_draw_border(n, d->focus == n, m == mon);
}

void set_private(monitor_t *m, desktop_t *d, node_t *n, bool value)
{
	if (n == NULL || n->client->private == value)
		return;

	client_t *c = n->client;

	PRINTF("set private %X: %s\n", c->window, BOOLSTR(value));

	c->private = value;
	update_privacy_level(n, value);
	window_draw_border(n, d->focus == n, m == mon);
}

void set_urgency(monitor_t *m, desktop_t *d, node_t *n, bool value)
{
	if (value && mon->desk->focus == n)
		return;
	n->client->urgent = value;
	window_draw_border(n, d->focus == n, m == mon);

	put_status(SBSC_MASK_WINDOW_URGENT, "window_urgent %s 0x%X\n", ONOFFSTR(value), n->client->window);
	put_status(SBSC_MASK_REPORT);
}

void set_floating_atom(xcb_window_t win, uint32_t value)
{
	if (!apply_floating_atom)
		return;
	set_atom(win, _BSPWM_FLOATING_WINDOW, value);
}

void enable_floating_atom(xcb_window_t win)
{
	set_floating_atom(win, 1);
}

void disable_floating_atom(xcb_window_t win)
{
	set_floating_atom(win, 0);
}

uint32_t get_border_color(client_t *c, bool focused_window, bool focused_monitor)
{
	if (c == NULL)
		return 0;

	uint32_t pxl = 0;

	if (focused_monitor && focused_window) {
		if (c->locked)
			get_color(focused_locked_border_color, c->window, &pxl);
		else if (c->sticky)
			get_color(focused_sticky_border_color, c->window, &pxl);
		else if (c->private)
			get_color(focused_private_border_color, c->window, &pxl);
		else
			get_color(focused_border_color, c->window, &pxl);
	} else if (focused_window) {
		if (c->urgent)
			get_color(urgent_border_color, c->window, &pxl);
		else if (c->locked)
			get_color(active_locked_border_color, c->window, &pxl);
		else if (c->sticky)
			get_color(active_sticky_border_color, c->window, &pxl);
		else if (c->private)
			get_color(active_private_border_color, c->window, &pxl);
		else
			get_color(active_border_color, c->window, &pxl);
	} else {
		if (c->urgent)
			get_color(urgent_border_color, c->window, &pxl);
		else if (c->locked)
			get_color(normal_locked_border_color, c->window, &pxl);
		else if (c->sticky)
			get_color(normal_sticky_border_color, c->window, &pxl);
		else if (c->private)
			get_color(normal_private_border_color, c->window, &pxl);
		else
			get_color(normal_border_color, c->window, &pxl);
	}

	return pxl;
}

void update_floating_rectangle(client_t *c)
{
	xcb_get_geometry_reply_t *geo = xcb_get_geometry_reply(dpy, xcb_get_geometry(dpy, c->window), NULL);

	if (geo != NULL)
		c->floating_rectangle = (xcb_rectangle_t) {geo->x, geo->y, geo->width, geo->height};

	free(geo);
}

void restrain_floating_width(client_t *c, int *width)
{
	if (*width < 1)
		*width = 1;
	if (c->min_width > 0 && *width < c->min_width)
		*width = c->min_width;
	else if (c->max_width > 0 && *width > c->max_width)
		*width = c->max_width;
}

void restrain_floating_height(client_t *c, int *height)
{
	if (*height < 1)
		*height = 1;
	if (c->min_height > 0 && *height < c->min_height)
		*height = c->min_height;
	else if (c->max_height > 0 && *height > c->max_height)
		*height = c->max_height;
}

void restrain_floating_size(client_t *c, int *width, int *height)
{
	restrain_floating_width(c, width);
	restrain_floating_height(c, height);
}

void query_pointer(xcb_window_t *win, xcb_point_t *pt)
{
	xcb_query_pointer_reply_t *qpr = xcb_query_pointer_reply(dpy, xcb_query_pointer(dpy, root), NULL);

	if (qpr != NULL) {
		if (win != NULL)
			*win = qpr->child;
		if (pt != NULL)
			*pt = (xcb_point_t) {qpr->root_x, qpr->root_y};
		free(qpr);
	}
}

bool window_focus(xcb_window_t win)
{
	coordinates_t loc;
	if (locate_window(win, &loc)) {
		if (loc.node != mon->desk->focus)
			focus_node(loc.monitor, loc.desktop, loc.node);
		return true;
	}
	return false;
}

void window_border_width(xcb_window_t win, uint32_t bw)
{
	uint32_t values[] = {bw};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_BORDER_WIDTH, values);
}

void window_move(xcb_window_t win, int16_t x, int16_t y)
{
	uint32_t values[] = {x, y};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_X_Y, values);
}

void window_resize(xcb_window_t win, uint16_t w, uint16_t h)
{
	uint32_t values[] = {w, h};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_WIDTH_HEIGHT, values);
}

void window_move_resize(xcb_window_t win, int16_t x, int16_t y, uint16_t w, uint16_t h)
{
	uint32_t values[] = {x, y, w, h};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_X_Y_WIDTH_HEIGHT, values);
}

void window_raise(xcb_window_t win)
{
	uint32_t values[] = {XCB_STACK_MODE_ABOVE};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
}

void window_center(monitor_t *m, client_t *c)
{
	xcb_rectangle_t *r = &c->floating_rectangle;
	xcb_rectangle_t a = m->rectangle;
	if (r->width >= a.width)
		r->x = a.x;
	else
		r->x = a.x + (a.width - r->width) / 2;
	if (r->height >= a.height)
		r->y = a.y;
	else
		r->y = a.y + (a.height - r->height) / 2;
	r->x -= c->border_width;
	r->y -= c->border_width;
}

void window_stack(xcb_window_t w1, xcb_window_t w2, uint32_t mode)
{
	if (w2 == XCB_NONE)
		return;
	uint16_t mask = XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE;
	uint32_t values[] = {w2, mode};
	xcb_configure_window(dpy, w1, mask, values);
}

void window_above(xcb_window_t w1, xcb_window_t w2)
{
	window_stack(w1, w2, XCB_STACK_MODE_ABOVE);
}

void window_below(xcb_window_t w1, xcb_window_t w2)
{
	window_stack(w1, w2, XCB_STACK_MODE_BELOW);
}

void window_lower(xcb_window_t win)
{
	uint32_t values[] = {XCB_STACK_MODE_BELOW};
	xcb_configure_window(dpy, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
}

void window_set_visibility(xcb_window_t win, bool visible)
{
	uint32_t values_off[] = {ROOT_EVENT_MASK & ~XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY};
	uint32_t values_on[] = {ROOT_EVENT_MASK};
	xcb_change_window_attributes(dpy, root, XCB_CW_EVENT_MASK, values_off);
	if (visible)
		xcb_map_window(dpy, win);
	else
		xcb_unmap_window(dpy, win);
	xcb_change_window_attributes(dpy, root, XCB_CW_EVENT_MASK, values_on);
}

void window_hide(xcb_window_t win)
{
	PRINTF("window hide %X\n", win);
	window_set_visibility(win, false);
}

void window_show(xcb_window_t win)
{
	PRINTF("window show %X\n", win);
	window_set_visibility(win, true);
}

void toggle_visibility(void)
{
	visible = !visible;
	if (!visible)
		clear_input_focus();
	for (monitor_t *m = mon_head; m != NULL; m = m->next)
		for (node_t *n = first_extrema(m->desk->root); n != NULL; n = next_leaf(n, m->desk->root))
			window_set_visibility(n->client->window, visible);
	if (visible)
		update_input_focus();
}

void update_input_focus(void)
{
	set_input_focus(mon->desk->focus);
}

void set_input_focus(node_t *n)
{
	if (n == NULL) {
		clear_input_focus();
	} else {
		if (n->client->icccm_focus)
			send_client_message(n->client->window, ewmh->WM_PROTOCOLS, WM_TAKE_FOCUS);
		xcb_set_input_focus(dpy, XCB_INPUT_FOCUS_POINTER_ROOT, n->client->window, XCB_CURRENT_TIME);
	}
}

void clear_input_focus(void)
{
	xcb_set_input_focus(dpy, XCB_INPUT_FOCUS_POINTER_ROOT, root, XCB_CURRENT_TIME);
}

void center_pointer(xcb_rectangle_t r)
{
	int16_t cx = r.x + r.width / 2;
	int16_t cy = r.y + r.height / 2;
	xcb_warp_pointer(dpy, XCB_NONE, root, 0, 0, 0, 0, cx, cy);
}

void get_atom(char *name, xcb_atom_t *atom)
{
	xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(dpy, xcb_intern_atom(dpy, 0, strlen(name), name), NULL);
	if (reply != NULL)
		*atom = reply->atom;
	else
		*atom = XCB_NONE;
	free(reply);
}

void set_atom(xcb_window_t win, xcb_atom_t atom, uint32_t value)
{
	xcb_change_property(dpy, XCB_PROP_MODE_REPLACE, win, atom, XCB_ATOM_CARDINAL, 32, 1, &value);
}

bool has_proto(xcb_atom_t atom, xcb_icccm_get_wm_protocols_reply_t *protocols)
{
	for (uint32_t i = 0; i < protocols->atoms_len; i++)
		if (protocols->atoms[i] == atom)
			return true;
	return false;
}

void send_client_message(xcb_window_t win, xcb_atom_t property, xcb_atom_t value)
{
	xcb_client_message_event_t e;

	e.response_type = XCB_CLIENT_MESSAGE;
	e.window = win;
	e.format = 32;
	e.sequence = 0;
	e.type = property;
	e.data.data32[0] = value;
	e.data.data32[1] = XCB_CURRENT_TIME;

	xcb_send_event(dpy, false, win, XCB_EVENT_MASK_NO_EVENT, (char *) &e);
}