Only damage popups when popups have damage

The previous behaviour was to damage the entire view, which would
recurse into each popup. This patch makes it damage only the popup's
surface, and respect the surface damage given by the client.

This adds listeners to the popup's map and unmap events rather than
doing the damage in the create and destroy functions. To get the popup's
position relative to the view, a new child_impl function get_root_coords
has been introduced, which traverses up the parents.

1 files changed, 17 insertions, 0 deletions

diff --git a/sway/desktop/xdg_shell.c b/sway/desktop/xdg_shell.c
index a8b527a7..9036448b 100644
--- a/sway/desktop/xdg_shell.c
+++ b/sway/desktop/xdg_shell.c
@@ -20,6 +20,19 @@
 
 static const struct sway_view_child_impl popup_impl;
 
+static void popup_get_root_coords(struct sway_view_child *child,
+		int *root_sx, int *root_sy) {
+	struct sway_xdg_popup *popup = (struct sway_xdg_popup *)child;
+	struct wlr_xdg_surface *surface = popup->wlr_xdg_surface;
+	*root_sx = -surface->geometry.x;
+	*root_sy = -surface->geometry.y;
+	while (surface && surface->role == WLR_XDG_SURFACE_ROLE_POPUP) {
+		*root_sx += surface->popup->geometry.x;
+		*root_sy += surface->popup->geometry.y;
+		surface = wlr_xdg_surface_from_wlr_surface(surface->popup->parent);
+	}
+}
+
 static void popup_destroy(struct sway_view_child *child) {
 	if (!sway_assert(child->impl == &popup_impl,
 			"Expected an xdg_shell popup")) {
@@ -32,6 +45,7 @@ static void popup_destroy(struct sway_view_child *child) {
 }
 
 static const struct sway_view_child_impl popup_impl = {
+	.get_root_coords = popup_get_root_coords,
 	.destroy = popup_destroy,
 };
 
@@ -85,6 +99,9 @@ static struct sway_xdg_popup *popup_create(
 	wl_signal_add(&xdg_surface->events.destroy, &popup->destroy);
 	popup->destroy.notify = popup_handle_destroy;
 
+	wl_signal_add(&xdg_surface->events.map, &popup->child.surface_map);
+	wl_signal_add(&xdg_surface->events.unmap, &popup->child.surface_unmap);
+
 	popup_unconstrain(popup);
 
 	return popup;