ivi-shell: add new signal to notify ivi shell destroying

In the case the controlelrs are depended on ivi-shell resource,
it must be destroy before the ivi shell destroy. To do this,
add new ivi shell destroy signal on ivi shell, emit it on
the begining of the shell destroying

Suggested-by: Harsha M M <harsha.manjulamallikarjun@in.bosch.com>
Suggested-by: Michael Olbrich <m.olbrich@pengutronix.de>
Suggested-by: Marius Vlad <marius.vlad@collabora.com>

Signed-off-by: Tran Ba Khang(MS/EMC31-XC) <Khang.TranBa@vn.bosch.com>

ivi-shell/ivi-layout-export.h

@@ -587,6 +587,20 @@ struct ivi_layout_interface {
 	 */
 	int32_t (*screen_remove_layer)(struct weston_output *output,
 				       struct ivi_layout_layer *removelayer);
+
+	/**
+	 * \brief Add a shell destroy listener only once.
+	 *
+	 * The begining of shell destroying, this signal is emitted
+	 * to the listening controller plugins.
+	 * The null pointer 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 (*shell_add_destroy_listener_once)(struct wl_listener *listener, 
+				wl_notify_func_t destroy_handler);
 };
 
 static inline const struct ivi_layout_interface *

ivi-shell/ivi-layout-private.h

@@ -99,6 +99,10 @@ struct ivi_layout {
 	struct wl_list screen_list;	/* ivi_layout_screen::link */
 	struct wl_list view_list;	/* ivi_layout_view::link */
 
+	struct {
+		struct wl_signal destroy_signal;
+	} shell_notification;
+
 	struct {
 		struct wl_signal created;
 		struct wl_signal removed;

ivi-shell/ivi-layout-shell.h

@@ -68,4 +68,7 @@ int
 load_controller_modules(struct weston_compositor *compositor, const char *modules,
 			int *argc, char *argv[]);
 
+void
+ivi_layout_ivi_shell_destroy(void);
+
 #endif /* IVI_LAYOUT_SHELL_H */

ivi-shell/ivi-layout.c

@@ -70,6 +70,7 @@
 
 #include "shared/helpers.h"
 #include "shared/os-compatibility.h"
+#include "shared/signal.h"
 
 #define max(a, b) ((a) > (b) ? (a) : (b))
 
@@ -1034,6 +1035,23 @@ ivi_layout_add_listener_configure_desktop_surface(struct wl_listener *listener)
 	return IVI_SUCCEEDED;
 }
 
+static int32_t
+ivi_layout_shell_add_destroy_listener_once(struct wl_listener *listener, wl_notify_func_t destroy_handler)
+{
+	struct ivi_layout *layout = get_instance();
+	if (!listener || !destroy_handler) {
+		weston_log("ivi_layout_shell_add_destroy_listener_once: invalid argument\n");
+		return IVI_FAILED;
+	}
+
+	if (wl_signal_get(&layout->shell_notification.destroy_signal, destroy_handler))
+		return IVI_FAILED;
+
+	listener->notify = destroy_handler;
+	wl_signal_add(&layout->shell_notification.destroy_signal, listener);
+	return IVI_SUCCEEDED;
+}
+
 uint32_t
 ivi_layout_get_id_of_surface(struct ivi_layout_surface *ivisurf)
 {
@@ -2064,6 +2082,15 @@ ivi_layout_surface_create(struct weston_surface *wl_surface,
 	return ivisurf;
 }
 
+void
+ivi_layout_ivi_shell_destroy(void)
+{
+	struct ivi_layout *layout = get_instance();
+
+	/* emit callback which is set by ivi-layout api user */
+	weston_signal_emit_mutable(&layout->shell_notification.destroy_signal, NULL);
+}
+
 static struct ivi_layout_interface ivi_layout_interface;
 
 void
@@ -2086,6 +2113,8 @@ ivi_layout_init_with_compositor(struct weston_compositor *ec)
 	wl_signal_init(&layout->surface_notification.configure_changed);
 	wl_signal_init(&layout->surface_notification.configure_desktop_changed);
 
+	wl_signal_init(&layout->shell_notification.destroy_signal);
+
 	/* Add layout_layer at the last of weston_compositor.layer_list */
 	weston_layer_init(&layout->layout_layer, ec);
 	weston_layer_set_position(&layout->layout_layer,
@@ -2190,4 +2219,9 @@ static struct ivi_layout_interface ivi_layout_interface = {
 	 */
 	.surface_get_size		= ivi_layout_surface_get_size,
 	.surface_dump			= ivi_layout_surface_dump,
+
+	/**
+	 * shell interfaces
+	 */
+	.shell_add_destroy_listener_once = ivi_layout_shell_add_destroy_listener_once,
 };

ivi-shell/ivi-shell.c

@@ -349,6 +349,8 @@ shell_destroy(struct wl_listener *listener, void *data)
 		container_of(listener, struct ivi_shell, destroy_listener);
 	struct ivi_shell_surface *ivisurf, *next;
 
+	ivi_layout_ivi_shell_destroy();
+
 	wl_list_remove(&shell->destroy_listener.link);
 	wl_list_remove(&shell->wake_listener.link);
 

ivi-shell/meson.build

@@ -15,7 +15,8 @@ if get_option('shell-ivi')
 		dependencies: [
 			dep_libm,
 			dep_libexec_weston,
-			dep_libweston_public
+			dep_libweston_public,
+			dep_libshared
 		],
 		name_prefix: '',
 		install: true,