[view] popup: add onShow and onClose methods

src/main/haxework/view/layout/DefaultLayout.hx

@@ -30,7 +30,7 @@ class DefaultLayout extends Layout {
                     placeViewVertical(group, view);
                     false;
                 case LAYOUT:
-                    true;
+                    view.visible;
             }
         }));
     }

src/main/haxework/view/popup/PopupView.hx

@@ -45,14 +45,20 @@ class PopupView<R> extends GroupView {
         return this.view;
     }
 
+    private function onShow():Void {}
+
+    private function onClose():Void {}
+
     public function show():Promise<R> {
         manager.show(this);
         deferred = new Deferred<R>();
+        onShow();
         return deferred.promise();
     }
 
     public function close(result:R):Void {
         manager.close(this);
+        onClose();
         if (deferred != null) {
             deferred.resolve(result);
             deferred = null;