ui/compositor/scoped_layer_animation_settings.h

   1 // Copyright (c) 2012 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 UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_
   6 #define UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_
   7
   8 #include <set>
   9
  10 #include "base/time.h"
  11
  12 #include "ui/base/animation/tween.h"
  13 #include "ui/compositor/compositor_export.h"
  14 #include "ui/compositor/layer_animator.h"
  15
  16 namespace ui {
  17
  18 class ImplicitAnimationObserver;
  19 class LayerAnimationObserver;
  20
  21 // Scoped settings allow you to temporarily change the animator's settings and
  22 // these changes are reverted when the object is destroyed. NOTE: when the
  23 // settings object is created, it applies the default transition duration
  24 // (200ms).
  25 class COMPOSITOR_EXPORT ScopedLayerAnimationSettings {
  26  public:
  27   explicit ScopedLayerAnimationSettings(LayerAnimator* animator);
  28   virtual ~ScopedLayerAnimationSettings();
  29
  30   void AddObserver(ImplicitAnimationObserver* observer);
  31
  32   void SetTransitionDuration(base::TimeDelta duration);
  33   base::TimeDelta GetTransitionDuration() const;
  34
  35   void SetTweenType(Tween::Type tween_type);
  36   Tween::Type GetTweenType() const;
  37
  38   void SetPreemptionStrategy(LayerAnimator::PreemptionStrategy strategy);
  39   LayerAnimator::PreemptionStrategy GetPreemptionStrategy() const;
  40
  41  private:
  42   LayerAnimator* animator_;
  43   base::TimeDelta old_transition_duration_;
  44   Tween::Type old_tween_type_;
  45   LayerAnimator::PreemptionStrategy old_preemption_strategy_;
  46   std::set<ImplicitAnimationObserver*> observers_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(ScopedLayerAnimationSettings);
  49 };
  50
  51 }  // namespace ui
  52
  53 #endif  // UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_