window.c - weston - Git Browser for ODROID

 /*
  * Copyright © 2008 Kristian Høgsberg
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
  * the above copyright notice appear in all copies and that both that copyright
  * notice and this permission notice appear in supporting documentation, and
  * that the name of the copyright holders not be used in advertising or
  * publicity pertaining to distribution of the software without specific,
  * written prior permission.  The copyright holders make no representations
  * about the suitability of this software for any purpose.  It is provided "as
  * is" without express or implied warranty.
  *
  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  * OF THIS SOFTWARE.
  */

 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <math.h>
 #include <time.h>
 #include <cairo.h>
 #include <glib.h>

 #include <linux/input.h>
 #include "wayland-client.h"
 #include "wayland-glib.h"

 #include "cairo-util.h"

 #include "window.h"

 struct window {
 	struct wl_display *display;
 	struct wl_compositor *compositor;
 	struct wl_surface *surface;
 	const char *title;
 	int x, y, width, height;
 	int minimum_width, minimum_height;
 	int margin;
 	int drag_x, drag_y;
 	int state;
 	uint32_t grab_device;
 	uint32_t name;
 	int fd;

 	struct buffer *buffer;

 	window_resize_handler_t resize_handler;
 	window_frame_handler_t frame_handler;
 	window_acknowledge_handler_t acknowledge_handler;
 	window_key_handler_t key_handler;
 	void *user_data;
 };

 static void
 rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
 {
 	cairo_move_to(cr, x0, y0 + radius);
 	cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
 	cairo_line_to(cr, x1 - radius, y0);
 	cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
 	cairo_line_to(cr, x1, y1 - radius);
 	cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
 	cairo_line_to(cr, x0 + radius, y1);
 	cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
 	cairo_close_path(cr);
 }

 void
 window_draw(struct window *window)
 {
 	cairo_surface_t *surface;
 	cairo_t *cr;
 	int border = 2, radius = 5;
 	cairo_text_extents_t extents;
 	cairo_pattern_t *gradient, *outline, *bright, *dim;
 	struct wl_visual *visual;

 	surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
 					     window->width + window->margin * 2,
 					     window->height + window->margin * 2);

 	outline = cairo_pattern_create_rgb(0.1, 0.1, 0.1);
 	bright = cairo_pattern_create_rgb(0.8, 0.8, 0.8);
 	dim = cairo_pattern_create_rgb(0.4, 0.4, 0.4);

 	cr = cairo_create(surface);

 	cairo_translate(cr, window->margin + 7, window->margin + 5);
 	cairo_set_line_width (cr, border);
 	cairo_set_source_rgba(cr, 0, 0, 0, 0.7);
 	rounded_rect(cr, 0, 0, window->width, window->height, radius);
 	cairo_fill(cr);
 	blur_surface(surface, 24 + radius);

 	cairo_translate(cr, -7, -5);
 	cairo_set_line_width (cr, border);
 	rounded_rect(cr, 1, 1, window->width - 1, window->height - 1, radius);
 	cairo_set_source(cr, outline);
 	cairo_stroke(cr);
 	rounded_rect(cr, 2, 2, window->width - 2, window->height - 2, radius - 1);
 	cairo_set_source(cr, bright);
 	cairo_stroke(cr);
 	rounded_rect(cr, 3, 3, window->width - 2, window->height - 2, radius - 1);
 	cairo_set_source(cr, dim);
 	cairo_stroke(cr);

 	rounded_rect(cr, 2, 2, window->width - 2, window->height - 2, radius - 1);
 	gradient = cairo_pattern_create_linear (0, 0, 0, 100);
 	cairo_pattern_add_color_stop_rgb(gradient, 0, 0.6, 0.6, 0.4);
 	cairo_pattern_add_color_stop_rgb(gradient, 1, 0.8, 0.8, 0.7);
 	cairo_set_source(cr, gradient);
 	cairo_fill(cr);
 	cairo_pattern_destroy(gradient);

 	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 	cairo_move_to(cr, 10, 50);
 	cairo_line_to(cr, window->width - 10, 50);
 	cairo_line_to(cr, window->width - 10, window->height - 10);
 	cairo_line_to(cr, 10, window->height - 10);
 	cairo_close_path(cr);
 	cairo_set_source(cr, dim);
 	cairo_stroke(cr);

 	cairo_move_to(cr, 11, 51);
 	cairo_line_to(cr, window->width - 10, 51);
 	cairo_line_to(cr, window->width - 10, window->height - 10);
 	cairo_line_to(cr, 11, window->height - 10);
 	cairo_close_path(cr);
 	cairo_set_source(cr, bright);
 	cairo_stroke(cr);

 	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 	cairo_set_font_size(cr, 14);
 	cairo_text_extents(cr, window->title, &extents);
 	cairo_move_to(cr, (window->width - extents.width) / 2, 10 - extents.y_bearing);
 	cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
 	cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
 	cairo_set_line_width (cr, 4);
 	cairo_text_path(cr, window->title);
 	cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
 	cairo_stroke_preserve(cr);
 	cairo_set_source_rgb(cr, 1, 1, 1);
 	cairo_fill(cr);
 	cairo_destroy(cr);

 	window->buffer = buffer_create_from_cairo_surface(window->fd, surface);
 	cairo_surface_destroy(surface);

 	visual = wl_display_get_premultiplied_argb_visual(window->display);
 	wl_surface_attach(window->surface,
 			  window->buffer->name,
 			  window->buffer->width,
 			  window->buffer->height,
 			  window->buffer->stride,
 			  visual);

 	wl_surface_map(window->surface,
 		       window->x - window->margin,
 		       window->y - window->margin,
 		       window->width + 2 * window->margin,
 		       window->height + 2 * window->margin);
 }

 enum window_state {
 	WINDOW_STABLE,
 	WINDOW_MOVING,
 	WINDOW_RESIZING_UPPER_LEFT,
 	WINDOW_RESIZING_UPPER_RIGHT,
 	WINDOW_RESIZING_LOWER_LEFT,
 	WINDOW_RESIZING_LOWER_RIGHT
 };

 enum location {
 	LOCATION_INTERIOR,
 	LOCATION_UPPER_LEFT,
 	LOCATION_UPPER_RIGHT,
 	LOCATION_LOWER_LEFT,
 	LOCATION_LOWER_RIGHT,
 	LOCATION_OUTSIDE
 };

 static void
 event_handler(struct wl_display *display,
 	      uint32_t object, uint32_t opcode,
 	      uint32_t size, uint32_t *p, void *data)
 {
 	struct window *window = data;
 	struct rectangle rectangle;
 	int location;
 	int grip_size = 16;

 	/* FIXME: Object ID 2 is the compositor, for anything else we
 	 * assume it's an input device. */
 	if (object == 2 && opcode == 0) {
 		uint32_t key = p[0];

 		/* Ignore acknowledge events for window move requests. */
 		if (key != 0)
 			return;

 		/* The acknowledge event means that the server
 		 * processed our last commit request and we can now
 		 * safely free the old window buffer if we resized and
 		 * render the next frame into our back buffer.. */

 		if (window->buffer != NULL) {
 			buffer_destroy(window->buffer, window->fd);
 			window->buffer = NULL;
 		}
 		if (window->acknowledge_handler)
 			(*window->acknowledge_handler)(window, key,
 						       window->user_data);

 	} else if (object == 2 && opcode == 1) {
 		/* The frame event means that the previous frame was
 		 * composited, and we can now send the request to copy
 		 * the frame we've rendered in the mean time into the
 		 * servers surface buffer. */
 		if (window->frame_handler)
 			(*window->frame_handler)(window, p[0], p[1],
 						 window->user_data);
 	} else if (object == 1) {
 		fprintf(stderr, "unexpected event from display: %d\n",
 			opcode);
 		exit(-1);
 	} else if (opcode == 0) {
 		int x = p[0], y = p[1];

 		switch (window->state) {
 		case WINDOW_MOVING:
 			if (window->grab_device != object)
 				break;
 			window->x = window->drag_x + x;
 			window->y = window->drag_y + y;
 			wl_surface_map(window->surface,
 				       window->x - window->margin,
 				       window->y - window->margin,
 				       window->width + 2 * window->margin,
 				       window->height + 2 * window->margin);
 			wl_compositor_commit(window->compositor, 1);
 			break;
 		case WINDOW_RESIZING_LOWER_RIGHT:
 			if (window->grab_device != object)
 				break;
 			window->width = window->drag_x + x;
 			window->height = window->drag_y + y;

 			window_get_child_rectangle(window, &rectangle);
 			if (window->resize_handler)
 				(*window->resize_handler)(window,
 							  window->user_data);

 			break;
 		}
 	} else if (opcode == 1) {
 		int button = p[0], state = p[1];
 		int32_t x = p[2], y = p[3];

 		if (window->x + window->width - grip_size <= x &&
 		    x < window->x + window->width &&
 		    window->y + window->height - grip_size <= y &&
 		    y < window->y + window->height) {
 			location = LOCATION_LOWER_RIGHT;
 		} else if (window->x <= x && x < window->x + window->width &&
 			   window->y <= y && y < window->y + window->height) {
 			location = LOCATION_INTERIOR;
 		} else {
 			location = LOCATION_OUTSIDE;
 		}

 		if (button == BTN_LEFT && state == 1) {
 			switch (location) {
 			case LOCATION_INTERIOR:
 				window->drag_x = window->x - x;
 				window->drag_y = window->y - y;
 				window->state = WINDOW_MOVING;
 				window->grab_device = object;
 				break;
 			case LOCATION_LOWER_RIGHT:
 				window->drag_x = window->width - x;
 				window->drag_y = window->height - y;
 				window->state = WINDOW_RESIZING_LOWER_RIGHT;
 				window->grab_device = object;
 				break;
 			default:
 				window->state = WINDOW_STABLE;
 				break;
 			}
 		} else if (button == BTN_LEFT &&
 			   state == 0 && object == window->grab_device) {
 			window->state = WINDOW_STABLE;
 		}
 	} else if (opcode == 2) {
 		if (window->key_handler)
 			(*window->key_handler)(window, p[0], p[1],
 					       window->user_data);
 	}
 }

 void
 window_get_child_rectangle(struct window *window,
 			   struct rectangle *rectangle)
 {
 	rectangle->x = 10;
 	rectangle->y = 50;
 	rectangle->width = window->width - 20;
 	rectangle->height = window->height - 60;
 }

 void
 window_set_child_size(struct window *window,
 		      struct rectangle *rectangle)
 {
 	window->width = rectangle->width + 20;
 	window->height = rectangle->height + 60;
 }

 void
 window_copy(struct window *window,
 	    struct rectangle *rectangle,
 	    uint32_t name, uint32_t stride)
 {
 	wl_surface_copy(window->surface,
 			window->margin + rectangle->x,
 			window->margin + rectangle->y,
 			name, stride,
 			0, 0, rectangle->width, rectangle->height);
 }

 void
 window_set_resize_handler(struct window *window,
 			  window_resize_handler_t handler, void *data)
 {
 	window->resize_handler = handler;
 	window->user_data = data;
 }

 void
 window_set_frame_handler(struct window *window,
 			 window_frame_handler_t handler, void *data)
 {
 	window->frame_handler = handler;
 	window->user_data = data;
 }

 void
 window_set_acknowledge_handler(struct window *window,
 			       window_acknowledge_handler_t handler, void *data)
 {
 	window->acknowledge_handler = handler;
 	window->user_data = data;
 }

 void
 window_set_key_handler(struct window *window,
 		       window_key_handler_t handler, void *data)
 {
 	window->key_handler = handler;
 	window->user_data = data;
 }

 void
 window_set_minimum_size(struct window *window, uint32_t width, int32_t height)
 {
 	window->minimum_width = width;
 	window->minimum_height = height;
 }

 struct window *
 window_create(struct wl_display *display, int fd,
 	      const char *title,
 	      int32_t x, int32_t y, int32_t width, int32_t height)
 {
 	struct window *window;

 	window = malloc(sizeof *window);
 	if (window == NULL)
 		return NULL;

 	memset(window, 0, sizeof *window);
 	window->display = display;
 	window->title = strdup(title);
 	window->compositor = wl_display_get_compositor(display);
 	window->surface = wl_compositor_create_surface(window->compositor);
 	window->x = x;
 	window->y = y;
 	window->minimum_width = 100;
 	window->minimum_height = 100;
 	window->width = width;
 	window->height = height;
 	window->margin = 16;
 	window->state = WINDOW_STABLE;
 	window->fd = fd;

 	wl_display_set_event_handler(display, event_handler, window);

 	return window;
 }
	/*
	* Copyright © 2008 Kristian Høgsberg
	*
	* Permission to use, copy, modify, distribute, and sell this software and its
	* documentation for any purpose is hereby granted without fee, provided that
	* the above copyright notice appear in all copies and that both that copyright
	* notice and this permission notice appear in supporting documentation, and
	* that the name of the copyright holders not be used in advertising or
	* publicity pertaining to distribution of the software without specific,
	* written prior permission. The copyright holders make no representations
	* about the suitability of this software for any purpose. It is provided "as
	* is" without express or implied warranty.
	*
	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	* OF THIS SOFTWARE.
	*/

	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <math.h>
	#include <time.h>
	#include <cairo.h>
	#include <glib.h>

	#include <linux/input.h>
	#include "wayland-client.h"
	#include "wayland-glib.h"

	#include "cairo-util.h"

	#include "window.h"

	struct window {
	struct wl_display *display;
	struct wl_compositor *compositor;
	struct wl_surface *surface;
	const char *title;
	int x, y, width, height;
	int minimum_width, minimum_height;
	int margin;
	int drag_x, drag_y;
	int state;
	uint32_t grab_device;
	uint32_t name;
	int fd;

	struct buffer *buffer;

	window_resize_handler_t resize_handler;
	window_frame_handler_t frame_handler;
	window_acknowledge_handler_t acknowledge_handler;
	window_key_handler_t key_handler;
	void *user_data;
	};

	static void
	rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
	{
	cairo_move_to(cr, x0, y0 + radius);
	cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
	cairo_line_to(cr, x1 - radius, y0);
	cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
	cairo_line_to(cr, x1, y1 - radius);
	cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
	cairo_line_to(cr, x0 + radius, y1);
	cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
	cairo_close_path(cr);
	}

	void
	window_draw(struct window *window)
	{
	cairo_surface_t *surface;
	cairo_t *cr;
	int border = 2, radius = 5;
	cairo_text_extents_t extents;
	cairo_pattern_t gradient, outline, bright, dim;
	struct wl_visual *visual;

	surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
	window->width + window->margin * 2,
	window->height + window->margin * 2);

	outline = cairo_pattern_create_rgb(0.1, 0.1, 0.1);
	bright = cairo_pattern_create_rgb(0.8, 0.8, 0.8);
	dim = cairo_pattern_create_rgb(0.4, 0.4, 0.4);

	cr = cairo_create(surface);

	cairo_translate(cr, window->margin + 7, window->margin + 5);
	cairo_set_line_width (cr, border);
	cairo_set_source_rgba(cr, 0, 0, 0, 0.7);
	rounded_rect(cr, 0, 0, window->width, window->height, radius);
	cairo_fill(cr);
	blur_surface(surface, 24 + radius);

	cairo_translate(cr, -7, -5);
	cairo_set_line_width (cr, border);
	rounded_rect(cr, 1, 1, window->width - 1, window->height - 1, radius);
	cairo_set_source(cr, outline);
	cairo_stroke(cr);
	rounded_rect(cr, 2, 2, window->width - 2, window->height - 2, radius - 1);
	cairo_set_source(cr, bright);
	cairo_stroke(cr);
	rounded_rect(cr, 3, 3, window->width - 2, window->height - 2, radius - 1);
	cairo_set_source(cr, dim);
	cairo_stroke(cr);

	rounded_rect(cr, 2, 2, window->width - 2, window->height - 2, radius - 1);
	gradient = cairo_pattern_create_linear (0, 0, 0, 100);
	cairo_pattern_add_color_stop_rgb(gradient, 0, 0.6, 0.6, 0.4);
	cairo_pattern_add_color_stop_rgb(gradient, 1, 0.8, 0.8, 0.7);
	cairo_set_source(cr, gradient);
	cairo_fill(cr);
	cairo_pattern_destroy(gradient);

	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
	cairo_move_to(cr, 10, 50);
	cairo_line_to(cr, window->width - 10, 50);
	cairo_line_to(cr, window->width - 10, window->height - 10);
	cairo_line_to(cr, 10, window->height - 10);
	cairo_close_path(cr);
	cairo_set_source(cr, dim);
	cairo_stroke(cr);

	cairo_move_to(cr, 11, 51);
	cairo_line_to(cr, window->width - 10, 51);
	cairo_line_to(cr, window->width - 10, window->height - 10);
	cairo_line_to(cr, 11, window->height - 10);
	cairo_close_path(cr);
	cairo_set_source(cr, bright);
	cairo_stroke(cr);

	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
	cairo_set_font_size(cr, 14);
	cairo_text_extents(cr, window->title, &extents);
	cairo_move_to(cr, (window->width - extents.width) / 2, 10 - extents.y_bearing);
	cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
	cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
	cairo_set_line_width (cr, 4);
	cairo_text_path(cr, window->title);
	cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
	cairo_stroke_preserve(cr);
	cairo_set_source_rgb(cr, 1, 1, 1);
	cairo_fill(cr);
	cairo_destroy(cr);

	window->buffer = buffer_create_from_cairo_surface(window->fd, surface);
	cairo_surface_destroy(surface);

	visual = wl_display_get_premultiplied_argb_visual(window->display);
	wl_surface_attach(window->surface,
	window->buffer->name,
	window->buffer->width,
	window->buffer->height,
	window->buffer->stride,
	visual);

	wl_surface_map(window->surface,
	window->x - window->margin,
	window->y - window->margin,
	window->width + 2 * window->margin,
	window->height + 2 * window->margin);
	}

	enum window_state {
	WINDOW_STABLE,
	WINDOW_MOVING,
	WINDOW_RESIZING_UPPER_LEFT,
	WINDOW_RESIZING_UPPER_RIGHT,
	WINDOW_RESIZING_LOWER_LEFT,
	WINDOW_RESIZING_LOWER_RIGHT
	};

	enum location {
	LOCATION_INTERIOR,
	LOCATION_UPPER_LEFT,
	LOCATION_UPPER_RIGHT,
	LOCATION_LOWER_LEFT,
	LOCATION_LOWER_RIGHT,
	LOCATION_OUTSIDE
	};

	static void
	event_handler(struct wl_display *display,
	uint32_t object, uint32_t opcode,
	uint32_t size, uint32_t p, void data)
	{
	struct window *window = data;
	struct rectangle rectangle;
	int location;
	int grip_size = 16;

	/* FIXME: Object ID 2 is the compositor, for anything else we
	* assume it's an input device. */
	if (object == 2 && opcode == 0) {
	uint32_t key = p[0];

	/* Ignore acknowledge events for window move requests. */
	if (key != 0)
	return;

	/* The acknowledge event means that the server
	* processed our last commit request and we can now
	* safely free the old window buffer if we resized and
	* render the next frame into our back buffer.. */

	if (window->buffer != NULL) {
	buffer_destroy(window->buffer, window->fd);
	window->buffer = NULL;
	}
	if (window->acknowledge_handler)
	(*window->acknowledge_handler)(window, key,
	window->user_data);

	} else if (object == 2 && opcode == 1) {
	/* The frame event means that the previous frame was
	* composited, and we can now send the request to copy
	* the frame we've rendered in the mean time into the
	* servers surface buffer. */
	if (window->frame_handler)
	(*window->frame_handler)(window, p[0], p[1],
	window->user_data);
	} else if (object == 1) {
	fprintf(stderr, "unexpected event from display: %d\n",
	opcode);
	exit(-1);
	} else if (opcode == 0) {
	int x = p[0], y = p[1];

	switch (window->state) {
	case WINDOW_MOVING:
	if (window->grab_device != object)
	break;
	window->x = window->drag_x + x;
	window->y = window->drag_y + y;
	wl_surface_map(window->surface,
	window->x - window->margin,
	window->y - window->margin,
	window->width + 2 * window->margin,
	window->height + 2 * window->margin);
	wl_compositor_commit(window->compositor, 1);
	break;
	case WINDOW_RESIZING_LOWER_RIGHT:
	if (window->grab_device != object)
	break;
	window->width = window->drag_x + x;
	window->height = window->drag_y + y;

	window_get_child_rectangle(window, &rectangle);
	if (window->resize_handler)
	(*window->resize_handler)(window,
	window->user_data);

	break;
	}
	} else if (opcode == 1) {
	int button = p[0], state = p[1];
	int32_t x = p[2], y = p[3];

	if (window->x + window->width - grip_size <= x &&
	x < window->x + window->width &&
	window->y + window->height - grip_size <= y &&
	y < window->y + window->height) {
	location = LOCATION_LOWER_RIGHT;
	} else if (window->x <= x && x < window->x + window->width &&
	window->y <= y && y < window->y + window->height) {
	location = LOCATION_INTERIOR;
	} else {
	location = LOCATION_OUTSIDE;
	}

	if (button == BTN_LEFT && state == 1) {
	switch (location) {
	case LOCATION_INTERIOR:
	window->drag_x = window->x - x;
	window->drag_y = window->y - y;
	window->state = WINDOW_MOVING;
	window->grab_device = object;
	break;
	case LOCATION_LOWER_RIGHT:
	window->drag_x = window->width - x;
	window->drag_y = window->height - y;
	window->state = WINDOW_RESIZING_LOWER_RIGHT;
	window->grab_device = object;
	break;
	default:
	window->state = WINDOW_STABLE;
	break;
	}
	} else if (button == BTN_LEFT &&
	state == 0 && object == window->grab_device) {
	window->state = WINDOW_STABLE;
	}
	} else if (opcode == 2) {
	if (window->key_handler)
	(*window->key_handler)(window, p[0], p[1],
	window->user_data);
	}
	}

	void
	window_get_child_rectangle(struct window *window,
	struct rectangle *rectangle)
	{
	rectangle->x = 10;
	rectangle->y = 50;
	rectangle->width = window->width - 20;
	rectangle->height = window->height - 60;
	}

	void
	window_set_child_size(struct window *window,
	struct rectangle *rectangle)
	{
	window->width = rectangle->width + 20;
	window->height = rectangle->height + 60;
	}

	void
	window_copy(struct window *window,
	struct rectangle *rectangle,
	uint32_t name, uint32_t stride)
	{
	wl_surface_copy(window->surface,
	window->margin + rectangle->x,
	window->margin + rectangle->y,
	name, stride,
	0, 0, rectangle->width, rectangle->height);
	}

	void
	window_set_resize_handler(struct window *window,
	window_resize_handler_t handler, void *data)
	{
	window->resize_handler = handler;
	window->user_data = data;
	}

	void
	window_set_frame_handler(struct window *window,
	window_frame_handler_t handler, void *data)
	{
	window->frame_handler = handler;
	window->user_data = data;
	}

	void
	window_set_acknowledge_handler(struct window *window,
	window_acknowledge_handler_t handler, void *data)
	{
	window->acknowledge_handler = handler;
	window->user_data = data;
	}

	void
	window_set_key_handler(struct window *window,
	window_key_handler_t handler, void *data)
	{
	window->key_handler = handler;
	window->user_data = data;
	}

	void
	window_set_minimum_size(struct window *window, uint32_t width, int32_t height)
	{
	window->minimum_width = width;
	window->minimum_height = height;
	}

	struct window *
	window_create(struct wl_display *display, int fd,
	const char *title,
	int32_t x, int32_t y, int32_t width, int32_t height)
	{
	struct window *window;

	window = malloc(sizeof *window);
	if (window == NULL)
	return NULL;

	memset(window, 0, sizeof *window);
	window->display = display;
	window->title = strdup(title);
	window->compositor = wl_display_get_compositor(display);
	window->surface = wl_compositor_create_surface(window->compositor);
	window->x = x;
	window->y = y;
	window->minimum_width = 100;
	window->minimum_height = 100;
	window->width = width;
	window->height = height;
	window->margin = 16;
	window->state = WINDOW_STABLE;
	window->fd = fd;

	wl_display_set_event_handler(display, event_handler, window);

	return window;
	}