[PATCH 6/6] clients: image: add touch handler support for resizing

[Tiago Vignatti]

From: Tiago Vignatti <tiago.vignatti at intel.com>

Signed-off-by: Tiago Vignatti <tiago.vignatti at intel.com>
---
 clients/image.c |  102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 102 insertions(+), 0 deletions(-)

diff --git a/clients/image.c b/clients/image.c
index a1920db..c545e86 100644
--- a/clients/image.c
+++ b/clients/image.c
@@ -46,6 +46,12 @@ struct image {
 	uint32_t key;
 	gchar *filename;
 	cairo_surface_t *c_image;
+
+	struct {
+		double current;
+		double target;
+		double previous;
+	} height, width;
 };
 
 static void
@@ -125,6 +131,88 @@ keyboard_focus_handler(struct window *window,
 	window_schedule_redraw(image->window);
 }
 
+static void
+frame_callback(void *data, struct wl_callback *callback, uint32_t time)
+{
+	static const struct wl_callback_listener listener = {
+		frame_callback
+	};
+	struct image *image = data;
+	double force, width, height;
+	width = image->width.current;
+	force = (image->width.target - width) / 10.0 +
+		(image->width.previous - width);
+
+	image->width.current =
+		width + (width - image->width.previous) + force;
+	image->width.previous = width;
+
+	if (image->width.current >= 1024) {
+		image->width.current = 1024;
+		image->width.previous = image->width.current;
+		goto bail;
+	}
+	if (image->width.current <= 50) {
+		image->width.current = 50;
+		image->width.previous = image->width.current;
+		goto bail;
+	}
+
+	height = image->height.current;
+	force = (image->height.target - height) / 10.0 +
+		(image->height.previous - height);
+
+	image->height.current =
+		height + (height - image->height.previous) + force;
+	image->height.previous = height;
+
+	if (image->height.current >= 640) {
+		image->height.current = 640;
+		image->height.previous = image->height.current;
+		goto bail;
+	}
+	if (image->height.current <= 50) {
+		image->height.current = 50;
+		image->height.previous = image->height.current;
+		goto bail;
+	}
+
+	window_set_child_size(image->window, width + 0.5, height + 0.5);
+
+bail:
+	window_schedule_redraw(image->window);
+
+	if (callback)
+		wl_callback_destroy(callback);
+	else
+		if (fabs(image->height.previous - image->height.target) > 0.1 ||
+		    fabs(image->width.previous - image->width.target) > 0.1) {
+			callback = wl_surface_frame(window_get_wl_surface
+						   (image->window));
+			wl_callback_add_listener(callback, &listener, image);
+		}
+}
+
+#define RESIZE_FACTOR 50
+static void
+touch_handler(struct window *window, struct input *input, uint32_t time,
+		int resize, void *data)
+{
+	struct image *image = data;
+
+	if (resize > 0) {
+		image->height.target = image->height.current + RESIZE_FACTOR;
+		image->width.target = image->width.current + RESIZE_FACTOR;
+	}
+	else {
+		image->height.target = image->height.current - RESIZE_FACTOR;
+		image->width.target = image->width.current - RESIZE_FACTOR;
+	}
+
+	frame_callback(image, NULL, 0);
+}
+
+
 static struct image *
 image_create(struct display *display, uint32_t key, const char *filename)
 {
@@ -155,6 +243,20 @@ image_create(struct display *display, uint32_t key, const char *filename)
 	window_set_redraw_handler(image->window, redraw_handler);
 	window_set_keyboard_focus_handler(image->window,
 					  keyboard_focus_handler);
+
+	window_set_touch_handler(image->window, touch_handler);
+
+	image->width.current = 500;
+	image->width.previous = image->width.current;
+	image->width.target = image->width.current;
+
+	image->height.current = 400;
+	image->height.previous = image->height.current;
+	image->height.target = image->height.current;
+
+	window_set_child_size(image->window, image->width.current + 0.5,
+			      image->height.current + 0.5);
+
 	image_load(image);
 	image_draw(image);
 
-- 
1.7.5.4