[PATCH weston] compositor: add a mouse motion binding type

[Giulio Camuffo]

when a mouse is moved the binding handler is called, passing it the
mouse position and the timestamp. a shell plugin can use this to
activate an effect when the mouse hits an output corner.
---
 src/bindings.c   | 36 ++++++++++++++++++++++++++++++++++++
 src/compositor.c |  8 ++++++++
 src/compositor.h | 16 ++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/src/bindings.c b/src/bindings.c
index 322736d..64f39e9 100644
--- a/src/bindings.c
+++ b/src/bindings.c
@@ -110,6 +110,24 @@ weston_compositor_add_axis_binding(struct weston_compositor *compositor,
 }
 
 WL_EXPORT struct weston_binding *
+weston_compositor_add_motion_binding(struct weston_compositor *compositor,
+				      enum weston_keyboard_modifier modifier,
+				      weston_motion_binding_handler_t handler,
+				      void *data)
+{
+	struct weston_binding *binding;
+
+	binding = weston_compositor_add_binding(compositor, 0, 0, 0,
+						modifier, handler, data);
+	if (binding == NULL)
+		return NULL;
+
+	wl_list_insert(compositor->motion_binding_list.prev, &binding->link);
+
+	return binding;
+}
+
+WL_EXPORT struct weston_binding *
 weston_compositor_add_debug_binding(struct weston_compositor *compositor,
 				    uint32_t key,
 				    weston_key_binding_handler_t handler,
@@ -270,6 +288,24 @@ weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 }
 
 WL_EXPORT int
+weston_compositor_run_motion_binding(struct weston_compositor *compositor,
+				      struct weston_seat *seat,
+				      uint32_t time,
+				      wl_fixed_t x, wl_fixed_t y)
+{
+	struct weston_binding *b;
+
+	wl_list_for_each(b, &compositor->motion_binding_list, link) {
+		if (b->modifier == seat->modifier_state) {
+			weston_motion_binding_handler_t handler = b->handler;
+			handler(&seat->seat, time, x, y, b->data);
+		}
+	}
+
+	return 0;
+}
+
+WL_EXPORT int
 weston_compositor_run_debug_binding(struct weston_compositor *compositor,
 				    struct weston_seat *seat,
 				    uint32_t time, uint32_t key,
diff --git a/src/compositor.c b/src/compositor.c
index e7c22db..e43fba4 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -1845,6 +1845,9 @@ notify_motion(struct weston_seat *seat,
 
 	weston_compositor_wake(ec);
 
+	weston_compositor_run_motion_binding(ec, seat,
+			time, pointer->x + dx, pointer->y + dy);
+
 	move_pointer(seat, pointer->x + dx, pointer->y + dy);
 
 	interface = pointer->grab->interface;
@@ -1862,6 +1865,9 @@ notify_motion_absolute(struct weston_seat *seat,
 
 	weston_compositor_wake(ec);
 
+	weston_compositor_run_motion_binding(ec, seat,
+					time, x, y);
+
 	move_pointer(seat, x, y);
 
 	interface = pointer->grab->interface;
@@ -3167,6 +3173,7 @@ weston_compositor_init(struct weston_compositor *ec,
 	wl_list_init(&ec->key_binding_list);
 	wl_list_init(&ec->button_binding_list);
 	wl_list_init(&ec->axis_binding_list);
+	wl_list_init(&ec->motion_binding_list);
 	wl_list_init(&ec->debug_binding_list);
 
 	weston_plane_init(&ec->primary_plane, 0, 0);
@@ -3215,6 +3222,7 @@ weston_compositor_shutdown(struct weston_compositor *ec)
 	weston_binding_list_destroy_all(&ec->key_binding_list);
 	weston_binding_list_destroy_all(&ec->button_binding_list);
 	weston_binding_list_destroy_all(&ec->axis_binding_list);
+	weston_binding_list_destroy_all(&ec->motion_binding_list);
 	weston_binding_list_destroy_all(&ec->debug_binding_list);
 
 	weston_plane_release(&ec->primary_plane);
diff --git a/src/compositor.h b/src/compositor.h
index 7d1d68e..18dcd7a 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -326,6 +326,7 @@ struct weston_compositor {
 	struct wl_list key_binding_list;
 	struct wl_list button_binding_list;
 	struct wl_list axis_binding_list;
+	struct wl_list motion_binding_list;
 	struct wl_list debug_binding_list;
 
 	uint32_t state;
@@ -660,6 +661,17 @@ weston_compositor_add_axis_binding(struct weston_compositor *compositor,
 			           enum weston_keyboard_modifier modifier,
 			           weston_axis_binding_handler_t binding,
 				   void *data);
+
+typedef void (*weston_motion_binding_handler_t)(struct wl_seat *seat,
+						 uint32_t time,
+						 wl_fixed_t x, wl_fixed_t y,
+						 void *data);
+struct weston_binding *
+weston_compositor_add_motion_binding(struct weston_compositor *compositor,
+				      enum weston_keyboard_modifier modifier,
+				      weston_motion_binding_handler_t binding,
+				      void *data);
+
 struct weston_binding *
 weston_compositor_add_debug_binding(struct weston_compositor *compositor,
 				    uint32_t key,
@@ -686,6 +698,10 @@ weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 				   struct weston_seat *seat, uint32_t time,
 				   uint32_t axis, int32_t value);
 int
+weston_compositor_run_motion_binding(struct weston_compositor *compositor,
+				      struct weston_seat *seat, uint32_t time,
+				      wl_fixed_t x, wl_fixed_t y);
+int
 weston_compositor_run_debug_binding(struct weston_compositor *compositor,
 				    struct weston_seat *seat, uint32_t time,
 				    uint32_t key,
-- 
1.8.2