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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/shelf_types.h"
     10 
     11 namespace aura {
     12 class RootWindow;
     13 }
     14 
     15 namespace ash {
     16 
     17 class ASH_EXPORT ShelfLayoutManagerObserver {
     18  public:
     19   virtual ~ShelfLayoutManagerObserver() {}
     20 
     21   // Called when the target ShelfLayoutManager will be deleted.
     22   virtual void WillDeleteShelf() {}
     23 
     24   // Called when the visibility change is scheduled.
     25   virtual void WillChangeVisibilityState(ShelfVisibilityState new_state) {}
     26 
     27   // Called when the auto hide state is changed.
     28   virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) {}
     29 
     30   // Called when the auto hide behavior is changed.
     31   virtual void OnAutoHideBehaviorChanged(aura::RootWindow* root_window,
     32                                          ShelfAutoHideBehavior new_behavior) {}
     33 };
     34 
     35 }  // namespace ash
     36 
     37 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
     38