1 files changed, 57 insertions, 0 deletions
diff --git a/lib/astal/gtk3/src/widget/overlay.vala b/lib/astal/gtk3/src/widget/overlay.vala
new file mode 100644
index 0000000..603ee66
--- /dev/null
+++ b/lib/astal/gtk3/src/widget/overlay.vala
@@ -0,0 +1,57 @@
+public class Astal.Overlay : Gtk.Overlay {
+    public bool pass_through { get; set; }
+
+    public Gtk.Widget? overlay {
+        get { return overlays.nth_data(0); }
+        set {
+            foreach (var ch in get_children()) {
+                if (ch != child)
+                    remove(ch);
+            }
+
+            if (value != null)
+                add_overlay(value);
+        }
+    }
+
+    public List<weak Gtk.Widget> overlays {
+        owned get { return get_children(); }
+        set {
+            foreach (var ch in get_children()) {
+                if (ch != child)
+                    remove(ch);
+            }
+
+            foreach (var ch in value)
+                add_overlay(ch);
+        }
+    }
+
+    public new Gtk.Widget? child {
+        get { return get_child(); }
+        set {
+            var ch = get_child();
+            if (ch != null)
+                remove(ch);
+
+            if (value != null)
+                add(value);
+        }
+    }
+
+    construct {
+        notify["pass-through"].connect(() => {
+            update_pass_through();
+        });
+    }
+
+    private void update_pass_through() {
+        foreach (var child in get_children())
+            set_overlay_pass_through(child, pass_through);
+    }
+
+    public new void add_overlay(Gtk.Widget widget) {
+        base.add_overlay(widget);
+        set_overlay_pass_through(widget, pass_through);
+    }
+}