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- // 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 start. At this point, asking
- // the overview controller whether it's in overview mode will return |false|.
- virtual void OnOverviewModeWillStart() {}
- // Called when the overview mode has just 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_
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