Handle view destruction properly

include/sway/container.h

@@ -132,6 +132,8 @@ swayc_t *new_output(struct sway_output *sway_output);
 swayc_t *new_workspace(swayc_t *output, const char *name);
 swayc_t *new_view(swayc_t *sibling, struct sway_view *sway_view);
 
+swayc_t *destroy_view(swayc_t *view);
+
 swayc_t *swayc_parent_by_type(swayc_t *container, enum swayc_types type);
 
 #endif

include/sway/layout.h

@@ -5,6 +5,7 @@ struct sway_container;
 
 void init_layout(void);
 void add_child(struct sway_container *parent, struct sway_container *child);
+struct sway_container *remove_child(struct sway_container *child);
 enum swayc_layouts default_layout(struct sway_container *output);
 void sort_workspaces(struct sway_container *output);
 void arrange_windows(struct sway_container *container, double width, double height);

include/sway/view.h

@@ -14,6 +14,7 @@ struct sway_xdg_surface_v6 {
 	struct wl_listener request_move;
 	struct wl_listener request_resize;
 	struct wl_listener request_maximize;
+	struct wl_listener destroy;
 
 	int pending_width, pending_height;
 };
@@ -38,7 +39,6 @@ enum sway_view_prop {
  * tree (shell surfaces).
  */
 struct sway_view {
-	struct wl_listener destroy;
 	enum sway_view_type type;
 	struct sway_container *swayc;
 	struct wlr_surface *surface;

sway/desktop/xdg_shell_v6.c

@@ -44,11 +44,22 @@ static void handle_commit(struct wl_listener *listener, void *data) {
 	sway_log(L_DEBUG, "xdg surface commit %dx%d",
 			sway_surface->pending_width, sway_surface->pending_height);
 	// NOTE: We intentionally discard the view's desired width here
-	// TODO: Don't do that for floating views
+	// TODO: Let floating views do whatever
 	view->width = sway_surface->pending_width;
 	view->height = sway_surface->pending_height;
 }
 
+static void handle_destroy(struct wl_listener *listener, void *data) {
+	struct sway_xdg_surface_v6 *sway_xdg_surface =
+		wl_container_of(listener, sway_xdg_surface, destroy);
+	wl_list_remove(&sway_xdg_surface->commit.link);
+	wl_list_remove(&sway_xdg_surface->destroy.link);
+	swayc_t *parent = destroy_view(sway_xdg_surface->view->swayc);
+	free(sway_xdg_surface->view);
+	free(sway_xdg_surface);
+	arrange_windows(parent, -1, -1);
+}
+
 void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data) {
 	struct sway_server *server = wl_container_of(
 			listener, server, xdg_shell_v6_surface);
@@ -90,6 +101,8 @@ void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data) {
 	
 	sway_surface->commit.notify = handle_commit;
 	wl_signal_add(&xdg_surface->events.commit, &sway_surface->commit);
+	sway_surface->destroy.notify = handle_destroy;
+	wl_signal_add(&xdg_surface->events.destroy, &sway_surface->destroy);
 
 	// TODO: actual focus semantics
 	swayc_t *parent = root_container.children->items[0];

sway/tree/container.c

@@ -109,6 +109,48 @@ swayc_t *new_view(swayc_t *sibling, struct sway_view *sway_view) {
 	return swayc;
 }
 
+static void free_swayc(swayc_t *cont) {
+	if (!sway_assert(cont, "free_swayc passed NULL")) {
+		return;
+	}
+	if (cont->children) {
+		// remove children until there are no more, free_swayc calls
+		// remove_child, which removes child from this container
+		while (cont->children->length) {
+			free_swayc(cont->children->items[0]);
+		}
+		list_free(cont->children);
+	}
+	if (cont->marks) {
+		list_foreach(cont->marks, free);
+		list_free(cont->marks);
+	}
+	if (cont->parent) {
+		remove_child(cont);
+	}
+	if (cont->name) {
+		free(cont->name);
+	}
+	free(cont);
+}
+
+swayc_t *destroy_view(swayc_t *view) {
+	if (!sway_assert(view, "null view passed to destroy_view")) {
+		return NULL;
+	}
+	sway_log(L_DEBUG, "Destroying view '%s'", view->name);
+	swayc_t *parent = view->parent;
+	free_swayc(view);
+
+	// TODO WLR: Destroy empty containers
+	/*
+	if (parent && parent->type == C_CONTAINER) {
+		return destroy_container(parent);
+	}
+	*/
+	return parent;
+}
+
 swayc_t *swayc_parent_by_type(swayc_t *container, enum swayc_types type) {
 	if (!sway_assert(container, "container is NULL")) {
 		return NULL;

sway/tree/layout.c

@@ -40,6 +40,19 @@ void add_child(swayc_t *parent, swayc_t *child) {
 	*/
 }
 
+swayc_t *remove_child(swayc_t *child) {
+	int i;
+	swayc_t *parent = child->parent;
+	for (i = 0; i < parent->children->length; ++i) {
+		if (parent->children->items[i] == child) {
+			list_del(parent->children, i);
+			break;
+		}
+	}
+	child->parent = NULL;
+	return parent;
+}
+
 enum swayc_layouts default_layout(swayc_t *output) {
 	/* TODO WLR
 	if (config->default_layout != L_NONE) {