Finish forward-porting @acrisci's positioner work

1 files changed, 56 insertions, 0 deletions

diff --git a/rootston/xdg_shell.c b/rootston/xdg_shell.c
index 927bd018..bd670a87 100644
--- a/rootston/xdg_shell.c
+++ b/rootston/xdg_shell.c
@@ -48,6 +48,59 @@ static void popup_handle_new_popup(struct wl_listener *listener, void *data) {
 	popup_create(popup->view_child.view, wlr_popup);
 }
 
+static void popup_unconstrain(struct roots_xdg_popup *popup) {
+	// get the output of the popup's positioner anchor point and convert it to
+	// the toplevel parent's coordinate system and then pass it to
+	// wlr_xdg_popup_v6_unconstrain_from_box
+
+	// TODO: unconstrain popups for rotated windows
+	if (popup->view_child.view->rotation != 0.0) {
+		return;
+	}
+
+	struct roots_view *view = popup->view_child.view;
+	struct wlr_output_layout *layout = view->desktop->layout;
+	struct wlr_xdg_popup *wlr_popup = popup->wlr_popup;
+
+	int anchor_lx, anchor_ly;
+	wlr_xdg_popup_get_anchor_point(wlr_popup, &anchor_lx, &anchor_ly);
+
+	int popup_lx, popup_ly;
+	wlr_xdg_popup_get_toplevel_coords(wlr_popup, wlr_popup->geometry.x,
+		wlr_popup->geometry.y, &popup_lx, &popup_ly);
+	popup_lx += view->x;
+	popup_ly += view->y;
+
+	anchor_lx += popup_lx;
+	anchor_ly += popup_ly;
+
+	double dest_x = 0, dest_y = 0;
+	wlr_output_layout_closest_point(layout, NULL, anchor_lx, anchor_ly,
+		&dest_x, &dest_y);
+
+	struct wlr_output *output =
+		wlr_output_layout_output_at(layout, dest_x, dest_y);
+
+	if (output == NULL) {
+		return;
+	}
+
+	int width = 0, height = 0;
+	wlr_output_effective_resolution(output, &width, &height);
+
+	// the output box expressed in the coordinate system of the toplevel parent
+	// of the popup
+	struct wlr_box output_toplevel_sx_box = {
+		.x = output->lx - view->x,
+		.y = output->ly - view->y,
+		.width = width,
+		.height = height
+	};
+
+	wlr_xdg_popup_unconstrain_from_box(
+			popup->wlr_popup, &output_toplevel_sx_box);
+}
+
 static struct roots_xdg_popup *popup_create(struct roots_view *view,
 		struct wlr_xdg_popup *wlr_popup) {
 	struct roots_xdg_popup *popup =
@@ -66,6 +119,9 @@ static struct roots_xdg_popup *popup_create(struct roots_view *view,
 	wl_signal_add(&wlr_popup->base->events.unmap, &popup->unmap);
 	popup->new_popup.notify = popup_handle_new_popup;
 	wl_signal_add(&wlr_popup->base->events.new_popup, &popup->new_popup);
+
+	popup_unconstrain(popup);
+
 	return popup;
 }