[PATCH] libweston-desktop: add signal title/app-id changes

[Matt Hoosier]

It's useful for the shell implementation to know when these change,
for example to relay the information on to taskbars or similar.

To avoid ABI changes or the need to make the weston_desktop_surface
definition public, new functions are introduced for attaching
listeners to these signals.

Signed-off-by: Matt Hoosier <matt.hoosier at gmail.com>
---
 libweston-desktop/libweston-desktop.h |  6 ++++++
 libweston-desktop/surface.c           | 21 +++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/libweston-desktop/libweston-desktop.h b/libweston-desktop/libweston-desktop.h
index 03b04c7b..e38257e5 100644
--- a/libweston-desktop/libweston-desktop.h
+++ b/libweston-desktop/libweston-desktop.h
@@ -164,6 +164,12 @@ weston_desktop_surface_set_size(struct weston_desktop_surface *surface,
 				int32_t width, int32_t height);
 void
 weston_desktop_surface_close(struct weston_desktop_surface *surface);
+void
+weston_desktop_surface_add_title_listener(struct weston_desktop_surface *surface,
+					  struct wl_listener *listener);
+void
+weston_desktop_surface_add_app_id_listener(struct weston_desktop_surface *surface,
+					   struct wl_listener *listener);
 
 void *
 weston_desktop_surface_get_user_data(struct weston_desktop_surface *surface);
diff --git a/libweston-desktop/surface.c b/libweston-desktop/surface.c
index d3be9364..97a455c6 100644
--- a/libweston-desktop/surface.c
+++ b/libweston-desktop/surface.c
@@ -64,6 +64,8 @@ struct weston_desktop_surface {
 		char *title;
 		char *app_id;
 		pid_t pid;
+		struct wl_signal title_signal;
+		struct wl_signal app_id_signal;
 	};
 	struct {
 		struct weston_desktop_surface *parent;
@@ -287,6 +289,9 @@ weston_desktop_surface_create(struct weston_desktop *desktop,
 	wl_list_init(&surface->view_list);
 	wl_list_init(&surface->grab_link);
 
+	wl_signal_init(&surface->title_signal);
+	wl_signal_init(&surface->app_id_signal);
+
 	return surface;
 }
 
@@ -511,6 +516,20 @@ weston_desktop_surface_close(struct weston_desktop_surface *surface)
 					       surface->implementation_data);
 }
 
+WL_EXPORT void
+weston_desktop_surface_add_title_listener(struct weston_desktop_surface *surface,
+					  struct wl_listener *listener)
+{
+	wl_signal_add(&surface->title_signal, listener);
+}
+
+WL_EXPORT void
+weston_desktop_surface_add_app_id_listener(struct weston_desktop_surface *surface,
+					   struct wl_listener *listener)
+{
+	wl_signal_add(&surface->app_id_signal, listener);
+}
+
 struct weston_desktop_surface *
 weston_desktop_surface_from_client_link(struct wl_list *link)
 {
@@ -687,6 +706,7 @@ weston_desktop_surface_set_title(struct weston_desktop_surface *surface,
 
 	free(surface->title);
 	surface->title = tmp;
+	wl_signal_emit(&surface->title_signal, surface->title);
 }
 
 void
@@ -701,6 +721,7 @@ weston_desktop_surface_set_app_id(struct weston_desktop_surface *surface,
 
 	free(surface->app_id);
 	surface->app_id = tmp;
+	wl_signal_emit(&surface->app_id_signal, surface->app_id);
 }
 
 void
-- 
2.13.3