libweston-desktop: Add shell capability queries

Allow other components to query which window-management operations are
supported by the shell.

Signed-off-by: Daniel Stone <daniels@collabora.com>

include/libweston-desktop/libweston-desktop.h

@@ -198,6 +198,19 @@ weston_desktop_surface_get_max_size(struct weston_desktop_surface *surface);
 struct weston_size
 weston_desktop_surface_get_min_size(struct weston_desktop_surface *surface);
 
+bool
+weston_desktop_window_menu_supported(struct weston_desktop *desktop);
+bool
+weston_desktop_move_supported(struct weston_desktop *desktop);
+bool
+weston_desktop_resize_supported(struct weston_desktop *desktop);
+bool
+weston_desktop_fullscreen_supported(struct weston_desktop *desktop);
+bool
+weston_desktop_minimize_supported(struct weston_desktop *desktop);
+bool
+weston_desktop_maximize_supported(struct weston_desktop *desktop);
+
 #ifdef __cplusplus
 }
 #endif

libweston/desktop/libweston-desktop.c

@@ -170,6 +170,12 @@ weston_desktop_api_show_window_menu(struct weston_desktop *desktop,
 					      desktop->user_data);
 }
 
+bool
+weston_desktop_window_menu_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.show_window_menu != NULL;
+}
+
 void
 weston_desktop_api_set_parent(struct weston_desktop *desktop,
 			      struct weston_desktop_surface *surface,
@@ -188,6 +194,12 @@ weston_desktop_api_move(struct weston_desktop *desktop,
 		desktop->api.move(surface, seat, serial, desktop->user_data);
 }
 
+bool
+weston_desktop_move_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.move != NULL;
+}
+
 void
 weston_desktop_api_resize(struct weston_desktop *desktop,
 			  struct weston_desktop_surface *surface,
@@ -199,6 +211,12 @@ weston_desktop_api_resize(struct weston_desktop *desktop,
 				    desktop->user_data);
 }
 
+bool
+weston_desktop_resize_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.resize != NULL;
+}
+
 void
 weston_desktop_api_fullscreen_requested(struct weston_desktop *desktop,
 					struct weston_desktop_surface *surface,
@@ -210,6 +228,12 @@ weston_desktop_api_fullscreen_requested(struct weston_desktop *desktop,
 						  desktop->user_data);
 }
 
+bool
+weston_desktop_fullscreen_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.fullscreen_requested != NULL;
+}
+
 void
 weston_desktop_api_maximized_requested(struct weston_desktop *desktop,
 				       struct weston_desktop_surface *surface,
@@ -220,6 +244,12 @@ weston_desktop_api_maximized_requested(struct weston_desktop *desktop,
 						 desktop->user_data);
 }
 
+bool
+weston_desktop_maximize_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.maximized_requested != NULL;
+}
+
 void
 weston_desktop_api_minimized_requested(struct weston_desktop *desktop,
 				       struct weston_desktop_surface *surface)
@@ -228,6 +258,12 @@ weston_desktop_api_minimized_requested(struct weston_desktop *desktop,
 		desktop->api.minimized_requested(surface, desktop->user_data);
 }
 
+bool
+weston_desktop_minimize_supported(struct weston_desktop *desktop)
+{
+	return desktop->api.minimized_requested != NULL;
+}
+
 void
 weston_desktop_api_set_xwayland_position(struct weston_desktop *desktop,
 					 struct weston_desktop_surface *surface,