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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_SHELF_SHELF_OBSERVER_H_
#define ASH_SHELF_SHELF_OBSERVER_H_
#include "ash/ash_export.h"
#include "ash/public/cpp/shelf_types.h"
namespace ash {
enum class AnimationChangeType;
// Used to observe changes to the shelf.
class ASH_EXPORT ShelfObserver {
public:
// Called when the shelf shutdown starts.
virtual void OnShelfShuttingDown() {}
// Invoked when background type is changed.
virtual void OnBackgroundTypeChanged(ShelfBackgroundType background_type,
AnimationChangeType change_type) {}
// Invoked when Shelf's visibility state changes to |new_state|.
virtual void OnShelfVisibilityStateChanged(ShelfVisibilityState new_state) {}
// Invoked when Shelf's auto hide state is changed to |new_state|.
virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) {}
// Invoked when the shelf auto-hide behavior is changed.
virtual void OnShelfAutoHideBehaviorChanged() {}
// Invoked when the positions of Shelf Icons are changed.
virtual void OnShelfIconPositionsChanged() {}
// Invoked when the hotseat state is changed.
virtual void OnHotseatStateChanged(HotseatState old_state,
HotseatState new_state) {}
// Invoked when the Shelf has updated its insets in work area insets.
virtual void OnShelfWorkAreaInsetsChanged() {}
protected:
virtual ~ShelfObserver() {}
};
} // namespace ash
#endif // ASH_SHELF_SHELF_OBSERVER_H_
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