| // Copyright (c) 2012 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_OBSERVER_H_ |
| #define UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ |
| |
| #include "base/observer_list_types.h" |
| #include "ui/views/views_export.h" |
| |
| namespace gfx { |
| class Rect; |
| } |
| |
| namespace views { |
| |
| class Widget; |
| |
| // Observers can listen to various events on the Widgets. |
| class VIEWS_EXPORT WidgetObserver : public base::CheckedObserver { |
| public: |
| // The closing notification is sent immediately in response to (i.e. in the |
| // same call stack as) a request to close the Widget (via Close() or |
| // CloseNow()). |
| virtual void OnWidgetClosing(Widget* widget) {} |
| |
| // Invoked after notification is received from the event loop that the native |
| // widget has been created. |
| virtual void OnWidgetCreated(Widget* widget) {} |
| |
| // The destroying event occurs immediately before the widget is destroyed. |
| // This typically occurs asynchronously with respect the the close request, as |
| // a result of a later invocation from the event loop. |
| virtual void OnWidgetDestroying(Widget* widget) {} |
| |
| // Invoked after notification is received from the event loop that the native |
| // widget has been destroyed. |
| virtual void OnWidgetDestroyed(Widget* widget) {} |
| |
| virtual void OnWidgetVisibilityChanging(Widget* widget, bool visible) {} |
| |
| virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) {} |
| |
| virtual void OnWidgetActivationChanged(Widget* widget, bool active) {} |
| |
| virtual void OnWidgetBoundsChanged(Widget* widget, |
| const gfx::Rect& new_bounds) {} |
| |
| protected: |
| ~WidgetObserver() override {} |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ |