| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_ |
| #define UI_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_ |
| |
| #include "ui/views/views_export.h" |
| |
| namespace views { |
| |
| class Widget; |
| class View; |
| |
| // |WidgetRemovalsObserver| complements |WidgetObserver| with additional |
| // notifications. These include events occurring during tear down like view |
| // removal. For this reason, it is recommended that subclasses not also inherit |
| // from |View|. |
| class VIEWS_EXPORT WidgetRemovalsObserver { |
| public: |
| // Called immediately before a descendant view of |widget| is removed |
| // from this widget. Won't be called if the view is moved within the |
| // same widget, but will be called if it's moved to a different widget. |
| // Only called on the root of a view tree; it implies that all of the |
| // descendants of |view| will be removed. |
| virtual void OnWillRemoveView(Widget* widget, View* view) {} |
| |
| protected: |
| virtual ~WidgetRemovalsObserver() {} |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_ |