scene_graph: port wlr_forgein_toplevel_management output enter/leave events

include/sway/tree/container.h

@@ -91,6 +91,10 @@ struct sway_container {
 	} border;
 
 	struct wlr_scene_tree *content_tree;
+	struct wlr_scene_buffer *output_handler;
+
+	struct wl_listener output_enter;
+	struct wl_listener output_leave;
 
 	struct sway_container_state current;
 	struct sway_container_state pending;

sway/desktop/transaction.c

@@ -385,6 +385,10 @@ static void arrange_container(struct sway_container *con,
 	// make sure it's enabled for viewing
 	wlr_scene_node_set_enabled(&con->scene_tree->node, true);
 
+	if (con->output_handler) {
+		wlr_scene_buffer_set_dest_size(con->output_handler, width, height);
+	}
+
 	if (con->view) {
 		int border_top = container_titlebar_height();
 		int border_width = con->current.border_thickness;

sway/tree/container.c

@@ -25,6 +25,35 @@
 #include "log.h"
 #include "stringop.h"
 
+static void handle_output_enter(
+		struct wl_listener *listener, void *data) {
+	struct sway_container *con = wl_container_of(
+			listener, con, output_enter);
+	struct wlr_scene_output *output = data;
+
+	if (con->view->foreign_toplevel) {
+		wlr_foreign_toplevel_handle_v1_output_enter(
+			con->view->foreign_toplevel, output->output);
+	}
+}
+
+static void handle_output_leave(
+		struct wl_listener *listener, void *data) {
+	struct sway_container *con = wl_container_of(
+			listener, con, output_leave);
+	struct wlr_scene_output *output = data;
+
+	if (con->view->foreign_toplevel) {
+		wlr_foreign_toplevel_handle_v1_output_leave(
+			con->view->foreign_toplevel, output->output);
+	}
+}
+
+static bool handle_point_accepts_input(
+		struct wlr_scene_buffer *buffer, double *x, double *y) {
+	return false;
+}
+
 static struct wlr_scene_rect *alloc_rect_node(struct wlr_scene_tree *parent,
 		bool *failed) {
 	if (*failed) {
@@ -63,6 +92,7 @@ struct sway_container *container_create(struct sway_view *view) {
 	//     - content_tree (we put the content node here so when we disable the
 	//       border everything gets disabled. We only render the content iff there
 	//       is a border as well)
+	//     - buffer used for output enter/leave events for foreign_toplevel
 	bool failed = false;
 	c->scene_tree = alloc_scene_tree(root->staging, &failed);
 
@@ -90,6 +120,22 @@ struct sway_container *container_create(struct sway_view *view) {
 		c->border.bottom = alloc_rect_node(c->border.tree, &failed);
 		c->border.left = alloc_rect_node(c->border.tree, &failed);
 		c->border.right = alloc_rect_node(c->border.tree, &failed);
+
+		c->output_handler = wlr_scene_buffer_create(c->border.tree, NULL);
+		if (!c->output_handler) {
+			sway_log(SWAY_ERROR, "Failed to allocate a scene node");
+			failed = true;
+		}
+
+		if (!failed) {
+			c->output_enter.notify = handle_output_enter;
+			wl_signal_add(&c->output_handler->events.output_enter,
+					&c->output_enter);
+			c->output_leave.notify = handle_output_leave;
+			wl_signal_add(&c->output_handler->events.output_leave,
+					&c->output_leave);
+			c->output_handler->point_accepts_input = handle_point_accepts_input;
+		}
 	}
 
 	if (!failed && !scene_descriptor_assign(&c->scene_tree->node,
@@ -456,6 +502,7 @@ void container_destroy(struct sway_container *con) {
 
 	if (con->view && con->view->container == con) {
 		con->view->container = NULL;
+		wlr_scene_node_destroy(&con->output_handler->node);
 		if (con->view->destroying) {
 			view_destroy(con->view);
 		}