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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.
- #ifndef ASH_PUBLIC_CPP_TABLET_MODE_OBSERVER_H_
- #define ASH_PUBLIC_CPP_TABLET_MODE_OBSERVER_H_
- #include "ash/public/cpp/ash_public_export.h"
- namespace ash {
- // Used to observe tablet mode changes inside ash. Exported for tests.
- class ASH_PUBLIC_EXPORT TabletModeObserver {
- public:
- // Called when the tablet mode is about to start.
- virtual void OnTabletModeStarting() {}
- // 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() {}
- // Called when the tablet physical state of the device changes (e.g. due to
- // lid angle changes, device attached/detached from base, ... etc.). It's
- // called before any notifications of UI changes (such as OnTabletModeStarted,
- // OnTabletModeEnded, ... etc.) that are results of this physical state
- // change.
- virtual void OnTabletPhysicalStateChanged() {}
- protected:
- virtual ~TabletModeObserver() = default;
- };
- } // namespace ash
- #endif // ASH_PUBLIC_CPP_TABLET_MODE_OBSERVER_H_
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