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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_WM_IMMERSIVE_REVEALED_LOCK_H_
      6 #define ASH_WM_IMMERSIVE_REVEALED_LOCK_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "base/basictypes.h"
     10 #include "base/memory/weak_ptr.h"
     11 
     12 namespace ash {
     13 
     14 // Class which keeps the top-of-window views revealed for the duration of its
     15 // lifetime. If acquiring the lock causes a reveal, the top-of-window views
     16 // will animate according to the |animate_reveal| parameter passed in the
     17 // constructor. See ImmersiveFullscreenController::GetRevealedLock() for more
     18 // details.
     19 class ASH_EXPORT ImmersiveRevealedLock {
     20  public:
     21   class ASH_EXPORT Delegate {
     22    public:
     23     enum AnimateReveal {
     24       ANIMATE_REVEAL_YES,
     25       ANIMATE_REVEAL_NO
     26     };
     27 
     28     virtual void LockRevealedState(AnimateReveal animate_reveal) = 0;
     29     virtual void UnlockRevealedState() = 0;
     30 
     31    protected:
     32     virtual ~Delegate() {}
     33   };
     34 
     35   ImmersiveRevealedLock(const base::WeakPtr<Delegate>& delegate,
     36                         Delegate::AnimateReveal animate_reveal);
     37   ~ImmersiveRevealedLock();
     38 
     39  private:
     40   base::WeakPtr<Delegate> delegate_;
     41 
     42   DISALLOW_COPY_AND_ASSIGN(ImmersiveRevealedLock);
     43 };
     44 
     45 }  // namespace ash
     46 
     47 #endif  // ASH_WM_IMMERSIVE_REVEALED_LOCK_H_
     48