Add window resize sample client

This is an example of how to animate window resizing.  The size is
animated by a simple physics model that allows the user to cancel the
animation halfway and still look good.

clients/Makefile.am

-noinst_PROGRAMS = gears flower screenshot terminal image view dnd smoke
+noinst_PROGRAMS = gears flower screenshot terminal image view dnd smoke resizor
 noinst_LTLIBRARIES = libtoytoolkit.la
 
 INCLUDES =					\
@@ -29,6 +29,7 @@ terminal_SOURCES = terminal.c
 image_SOURCES = image.c
 view_SOURCES = view.c
 dnd_SOURCES = dnd.c
+resizor_SOURCES = resizor.c
 
 BUILT_SOURCES =					\
 	screenshooter-client-protocol.h		\

clients/resizor.c

+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * 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 <cairo.h>
+
+#include "wayland-util.h"
+#include "wayland-client.h"
+#include "wayland-glib.h"
+
+#include "window.h"
+
+#include <X11/keysym.h>
+
+struct resizor {
+	struct display *display;
+	struct window *window;
+	struct rectangle child_allocation;
+
+	struct {
+		double current;
+		double target;
+		double previous;
+	} height;
+};
+
+static void
+resizor_draw(struct resizor *resizor)
+{
+	cairo_surface_t *surface;
+	cairo_t *cr;
+
+	window_draw(resizor->window);
+
+	window_get_child_rectangle(resizor->window,
+				   &resizor->child_allocation);
+
+	surface = window_get_surface(resizor->window);
+
+	cr = cairo_create(surface);
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_rectangle(cr,
+			resizor->child_allocation.x,
+			resizor->child_allocation.y,
+			resizor->child_allocation.width,
+			resizor->child_allocation.height);
+	cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
+	cairo_fill(cr);
+	cairo_destroy(cr);
+
+	cairo_surface_destroy(surface);
+
+	window_flush(resizor->window);
+}
+
+static void
+redraw_handler(struct window *window, void *data)
+{
+	struct resizor *resizor = data;
+
+	resizor_draw(resizor);
+}
+
+static void
+keyboard_focus_handler(struct window *window,
+		       struct input *device, void *data)
+{
+	struct resizor *resizor = data;
+
+	window_schedule_redraw(resizor->window);
+}
+
+static void
+frame_callback(void *data, uint32_t time)
+{
+	struct resizor *resizor = data;
+	double force, height;
+
+	height = resizor->height.current;
+	force = (resizor->height.target - height) / 10.0 +
+		(resizor->height.previous - height);
+
+	resizor->height.current =
+		height + (height - resizor->height.previous) + force;
+	resizor->height.previous = height;
+
+	if (resizor->height.current >= 400) {
+		resizor->height.current = 400;
+		resizor->height.previous = 400;
+	}
+
+	if (resizor->height.current <= 200) {
+		resizor->height.current = 200;
+		resizor->height.previous = 200;
+	}
+
+	resizor->child_allocation.height = height + 0.5;
+	window_set_child_size(resizor->window,
+			      &resizor->child_allocation);
+
+	if ((int) (height + 0.5) != resizor->height.target) {
+		window_schedule_redraw(resizor->window);
+		wl_display_frame_callback(display_get_display(resizor->display),
+					  frame_callback, resizor);
+	}
+}
+
+static void
+key_handler(struct window *window, uint32_t key, uint32_t sym,
+	    uint32_t state, uint32_t modifiers, void *data)
+{
+	struct resizor *resizor = data;
+
+	if (state == 0)
+		return;
+
+	switch (sym) {
+	case XK_F1:
+		resizor->height.target = 400;
+		resizor->height.current = resizor->child_allocation.height;
+		frame_callback(resizor, 0);
+		break;
+	case XK_F2:
+		resizor->height.target = 200;
+		resizor->height.current = resizor->child_allocation.height;
+		frame_callback(resizor, 0);
+		break;
+	}
+}
+
+static struct resizor *
+resizor_create(struct display *display)
+{
+	struct resizor *resizor;
+
+	resizor = malloc(sizeof *resizor);
+	if (resizor == NULL)
+		return resizor;
+	memset(resizor, 0, sizeof *resizor);
+
+	resizor->window = window_create(display, "Wayland Resizor",
+				     100, 100, 500, 400);
+	resizor->display = display;
+
+	window_set_key_handler(resizor->window, key_handler);
+	window_set_user_data(resizor->window, resizor);
+	window_set_redraw_handler(resizor->window, redraw_handler);
+	window_set_keyboard_focus_handler(resizor->window,
+					  keyboard_focus_handler);
+
+	resizor->child_allocation.x = 0;
+	resizor->child_allocation.y = 0;
+	resizor->child_allocation.width = 300;
+	resizor->child_allocation.height = 400;
+	resizor->height.current = 400;
+	resizor->height.previous = 400;
+	resizor->height.target = 400;
+
+	window_set_child_size(resizor->window, &resizor->child_allocation);
+
+	resizor_draw(resizor);
+
+	return resizor;
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct display *d;
+
+	d = display_create(&argc, &argv, NULL);
+	if (d == NULL) {
+		fprintf(stderr, "failed to create display: %m\n");
+		return -1;
+	}
+
+	resizor_create (d);
+
+	display_run(d);
+
+	return 0;
+}