ivi-shell: rework layer_add_notification API

The layer_add_notification API accepts a simple
wl_listener instead of a ivi-shell specific notification
function. Therefore, the API is renamed to layer_add_listener.

This change has several advantages:
1. Code cleanup
2. No dynamic memory allocation. Listeners are allocated
   by controller plugins
3. Remove API is not needed. Controller plugins can easily
   remove the listener link.

This patch also remove two APIs which are not needed:
- ivi_layout_layer_remove_notification
- ivi_layout_layer_remove_notification_by_callback

Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

2 files changed, 15 insertions, 110 deletions

diff --git a/ivi-shell/ivi-layout-export.h b/ivi-shell/ivi-layout-export.h
index 05f3668f..d7a880ca 100644
--- a/ivi-shell/ivi-layout-export.h
+++ b/ivi-shell/ivi-layout-export.h
@@ -138,12 +138,6 @@ enum ivi_layout_transition_type{
 	IVI_LAYOUT_TRANSITION_MAX,
 };
 
-typedef void (*layer_property_notification_func)(
-			struct ivi_layout_layer *ivilayer,
-			const struct ivi_layout_layer_properties *,
-			enum ivi_layout_notification_mask mask,
-			void *userdata);
-
 typedef void (*layer_create_notification_func)(
 			struct ivi_layout_layer *ivilayer,
 			void *userdata);
@@ -522,19 +516,18 @@ struct ivi_layout_interface {
 					  int32_t number);
 
 	/**
-	 * \brief register for notification on property changes of ivi_layer
+	 * \brief add a listener to listen property changes of ivi_layer
+	 *
+	 *	When a property of the ivi_layer is changed, the property_changed
+	 * signal is emitted to the listening controller plugins.
+	 * The pointer of the ivi_layer is sent as the void *data argument
+	 * to the wl_listener::notify callback function of the listener.
 	 *
 	 * \return IVI_SUCCEEDED if the method call was successful
 	 * \return IVI_FAILED if the method call was failed
 	 */
-	int32_t (*layer_add_notification)(struct ivi_layout_layer *ivilayer,
-					  layer_property_notification_func callback,
-					  void *userdata);
-
-	/**
-	 * \brief remove notification on property changes of ivi_layer
-	 */
-	void (*layer_remove_notification)(struct ivi_layout_layer *ivilayer);
+	int32_t (*layer_add_listener)(struct ivi_layout_layer *ivilayer,
+					  struct wl_listener *listener);
 
 	/**
 	 * \brief set type of transition animation
@@ -596,13 +589,6 @@ struct ivi_layout_interface {
 				void *target, size_t size,
 				int32_t x, int32_t y,
 				int32_t width, int32_t height);
-
-	/**
-	 * \brief remove notification by callback on property changes of ivi_layer
-	 */
-	void (*layer_remove_notification_by_callback)(struct ivi_layout_layer *ivilayer,
-						      layer_property_notification_func callback,
-						      void *userdata);
 };
 
 #ifdef __cplusplus
diff --git a/ivi-shell/ivi-layout.c b/ivi-shell/ivi-layout.c
index 013e0968..75350a39 100644
--- a/ivi-shell/ivi-layout.c
+++ b/ivi-shell/ivi-layout.c
@@ -181,26 +181,6 @@ get_screen_from_output(struct weston_output *output)
 	return NULL;
 }
 
-static void
-remove_all_notification(struct wl_list *listener_list)
-{
-	struct wl_listener *listener = NULL;
-	struct wl_listener *next = NULL;
-
-	wl_list_for_each_safe(listener, next, listener_list, link) {
-		struct listener_layout_notification *notification = NULL;
-		wl_list_remove(&listener->link);
-
-		notification =
-			container_of(listener,
-				     struct listener_layout_notification,
-				     listener);
-
-		free(notification->userdata);
-		free(notification);
-	}
-}
-
 /**
  * Called at destruction of wl_surface/ivi_surface
  */
@@ -985,23 +965,6 @@ layer_removed(struct wl_listener *listener, void *data)
 }
 
 static void
-layer_prop_changed(struct wl_listener *listener, void *data)
-{
-	struct ivi_layout_layer *ivilayer = data;
-
-	struct listener_layout_notification *layout_listener =
-		container_of(listener,
-			     struct listener_layout_notification,
-			     listener);
-
-	struct ivi_layout_notification_callback *prop_callback =
-		layout_listener->userdata;
-
-	((layer_property_notification_func)prop_callback->callback)
-		(ivilayer, &ivilayer->prop, ivilayer->prop.event_mask, prop_callback->data);
-}
-
-static void
 surface_created(struct wl_listener *listener, void *data)
 {
 	struct ivi_layout_surface *ivisurface = data;
@@ -1582,30 +1545,6 @@ ivi_layout_layer_create_with_dimension(uint32_t id_layer,
 }
 
 static void
-ivi_layout_layer_remove_notification(struct ivi_layout_layer *ivilayer)
-{
-	if (ivilayer == NULL) {
-		weston_log("ivi_layout_layer_remove_notification: invalid argument\n");
-		return;
-	}
-
-	remove_all_notification(&ivilayer->property_changed.listener_list);
-}
-
-static void
-ivi_layout_layer_remove_notification_by_callback(struct ivi_layout_layer *ivilayer,
-						 layer_property_notification_func callback,
-						 void *userdata)
-{
-	if (ivilayer == NULL) {
-		weston_log("ivi_layout_layer_remove_notification_by_callback: invalid argument\n");
-		return;
-	}
-
-	remove_notification(&ivilayer->property_changed.listener_list, callback, userdata);
-}
-
-static void
 ivi_layout_layer_destroy(struct ivi_layout_layer *ivilayer)
 {
 	struct ivi_layout *layout = get_instance();
@@ -1627,8 +1566,6 @@ ivi_layout_layer_destroy(struct ivi_layout_layer *ivilayer)
 	wl_list_remove(&ivilayer->order.link);
 	wl_list_remove(&ivilayer->link);
 
-	ivi_layout_layer_remove_notification(ivilayer);
-
 	free(ivilayer);
 }
 
@@ -1983,29 +1920,17 @@ ivi_layout_surface_get_size(struct ivi_layout_surface *ivisurf,
 }
 
 static int32_t
-ivi_layout_layer_add_notification(struct ivi_layout_layer *ivilayer,
-				  layer_property_notification_func callback,
-				  void *userdata)
+ivi_layout_layer_add_listener(struct ivi_layout_layer *ivilayer,
+				  struct wl_listener *listener)
 {
-	struct ivi_layout_notification_callback *prop_callback = NULL;
-
-	if (ivilayer == NULL || callback == NULL) {
-		weston_log("ivi_layout_layer_add_notification: invalid argument\n");
+	if (ivilayer == NULL || listener == NULL) {
+		weston_log("ivi_layout_layer_add_listener: invalid argument\n");
 		return IVI_FAILED;
 	}
 
-	prop_callback = malloc(sizeof *prop_callback);
-	if (prop_callback == NULL) {
-		weston_log("fails to allocate memory\n");
-		return IVI_FAILED;
-	}
-
-	prop_callback->callback = callback;
-	prop_callback->data = userdata;
+	wl_signal_add(&ivilayer->property_changed, listener);
 
-	return add_notification(&ivilayer->property_changed,
-				layer_prop_changed,
-				prop_callback);
+	return IVI_SUCCEEDED;
 }
 
 static const struct ivi_layout_surface_properties *
@@ -2348,8 +2273,7 @@ static struct ivi_layout_interface ivi_layout_interface = {
 	.layer_add_surface			= ivi_layout_layer_add_surface,
 	.layer_remove_surface			= ivi_layout_layer_remove_surface,
 	.layer_set_render_order			= ivi_layout_layer_set_render_order,
-	.layer_add_notification			= ivi_layout_layer_add_notification,
-	.layer_remove_notification		= ivi_layout_layer_remove_notification,
+	.layer_add_listener			= ivi_layout_layer_add_listener,
 	.layer_set_transition			= ivi_layout_layer_set_transition,
 
 	/**
@@ -2370,11 +2294,6 @@ static struct ivi_layout_interface ivi_layout_interface = {
 	 */
 	.surface_get_size		= ivi_layout_surface_get_size,
 	.surface_dump			= ivi_layout_surface_dump,
-
-	/**
-	 * remove notification by callback on property changes of ivi_surface/layer
-	 */
-	.layer_remove_notification_by_callback		= ivi_layout_layer_remove_notification_by_callback
 };
 
 int