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// Copyright 2017 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.
#include "ash/ash_export.h"
namespace ash {
// Used to observe tablet mode changes inside ash. Exported for tests.
// NOTE: Code in chrome should use TabletModeClientObserver.
class ASH_EXPORT TabletModeObserver {
// Called when the tablet mode has started. Windows might still be animating
// though.
virtual void OnTabletModeStarted() {}
// Called when the tablet mode is about to end.
virtual void OnTabletModeEnding() {}
// Called when the tablet mode has ended. Windows may still be animating but
// have been restored.
virtual void OnTabletModeEnded() {}
// Called when tablet mode blocks or unblocks events. This usually matches,
// exiting or entering tablet mode, except when an external mouse is
// connected.
virtual void OnTabletModeEventsBlockingChanged() {}
// Called when the tablet mode controller is destroyed, to help manage issues
// with observers being destroyed after controllers.
virtual void OnTabletControllerDestroyed() {}
virtual ~TabletModeObserver() = default;
} // namespace ash