| // Copyright 2019 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 ASH_WM_OVERVIEW_OVERVIEW_OBSERVER_H_ |
| #define ASH_WM_OVERVIEW_OVERVIEW_OBSERVER_H_ |
| |
| #include "ash/ash_export.h" |
| #include "base/observer_list_types.h" |
| |
| namespace ash { |
| class OverviewSession; |
| |
| // Used to observe overview mode changes in ash. |
| class ASH_EXPORT OverviewObserver : public base::CheckedObserver { |
| public: |
| // Called when the overview mode is about to be started (before the windows |
| // get re-arranged). |
| virtual void OnOverviewModeStarting() {} |
| |
| // Called after the animations that happen when overview mode is started are |
| // complete. If |canceled| it means overview was quit before the start |
| // animations were finished. |
| virtual void OnOverviewModeStartingAnimationComplete(bool canceled) {} |
| |
| // Called when the overview mode is about to end (before the windows restore |
| // themselves). |overview_session| will not be null. |
| virtual void OnOverviewModeEnding(OverviewSession* overview_session) {} |
| |
| // Called after overview mode has ended. |
| virtual void OnOverviewModeEnded() {} |
| |
| // Called after the animations that happen when overview mode is ended are |
| // complete. If |canceled| it means overview was reentered before the exit |
| // animations were finished. |
| virtual void OnOverviewModeEndingAnimationComplete(bool canceled) {} |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_WM_OVERVIEW_OVERVIEW_OBSERVER_H_ |