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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
      6 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/shelf/background_animator.h"
     10 #include "ash/shelf/shelf_types.h"
     11 
     12 namespace aura {
     13 class Window;
     14 }
     15 
     16 namespace ash {
     17 
     18 class ASH_EXPORT ShelfLayoutManagerObserver {
     19  public:
     20   virtual ~ShelfLayoutManagerObserver() {}
     21 
     22   // Called when the target ShelfLayoutManager will be deleted.
     23   virtual void WillDeleteShelf() {}
     24 
     25   // Called when the visibility change is scheduled.
     26   virtual void WillChangeVisibilityState(ShelfVisibilityState new_state) {}
     27 
     28   // Called when the auto hide state is changed.
     29   virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) {}
     30 
     31   // Called when the auto hide behavior is changed.
     32   virtual void OnAutoHideBehaviorChanged(aura::Window* root_window,
     33                                          ShelfAutoHideBehavior new_behavior) {}
     34 
     35   // Called when shelf background animation is started.
     36   virtual void OnBackgroundUpdated(
     37       ShelfBackgroundType background_type,
     38       BackgroundAnimatorChangeType change_type) {}
     39 };
     40 
     41 }  // namespace ash
     42 
     43 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
     44