Add xdg-positioner support

1 files changed, 50 insertions, 0 deletions

diff --git a/sway/desktop/xdg_shell.c b/sway/desktop/xdg_shell.c
index be14adbe..17b7b750 100644
--- a/sway/desktop/xdg_shell.c
+++ b/sway/desktop/xdg_shell.c
@@ -45,6 +45,53 @@ static void popup_handle_destroy(struct wl_listener *listener, void *data) {
         view_child_destroy(&popup->child);
 }
 
+static void popup_unconstrain(struct sway_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_unconstrain_from_box
+
+        struct sway_view *view = popup->child.view;
+        struct wlr_output_layout *output_layout =
+                root_container.sway_root->output_layout;
+        struct wlr_xdg_popup *wlr_popup = popup->wlr_xdg_surface->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(output_layout, NULL, anchor_lx, anchor_ly,
+                &dest_x, &dest_y);
+
+        struct wlr_output *output =
+                wlr_output_layout_output_at(output_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(wlr_popup, &output_toplevel_sx_box);
+}
+
 static struct sway_xdg_popup *popup_create(
                 struct wlr_xdg_popup *wlr_popup, struct sway_view *view) {
         struct wlr_xdg_surface *xdg_surface = wlr_popup->base;
@@ -55,12 +102,15 @@ static struct sway_xdg_popup *popup_create(
                 return NULL;
         }
         view_child_init(&popup->child, &popup_impl, view, xdg_surface->surface);
+        popup->wlr_xdg_surface = xdg_surface;
 
         wl_signal_add(&xdg_surface->events.new_popup, &popup->new_popup);
         popup->new_popup.notify = popup_handle_new_popup;
         wl_signal_add(&xdg_surface->events.destroy, &popup->destroy);
         popup->destroy.notify = popup_handle_destroy;
 
+        popup_unconstrain(popup);
+
         return popup;
 }