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/memory/scoped_vector.h"
  11 #include "base/time/time.h"
  12
  13 #include "ui/compositor/compositor_export.h"
  14 #include "ui/compositor/layer_animator.h"
  15 #include "ui/gfx/animation/tween.h"
  16
  17 namespace ui {
  18
  19 class ImplicitAnimationObserver;
  20 class LayerAnimationObserver;
  21 class InvertingObserver;
  22
  23 // Scoped settings allow you to temporarily change the animator's settings and
  24 // these changes are reverted when the object is destroyed. NOTE: when the
  25 // settings object is created, it applies the default transition duration
  26 // (200ms).
  27 class COMPOSITOR_EXPORT ScopedLayerAnimationSettings {
  28  public:
  29   explicit ScopedLayerAnimationSettings(LayerAnimator* animator);
  30   virtual ~ScopedLayerAnimationSettings();
  31
  32   void AddObserver(ImplicitAnimationObserver* observer);
  33
  34   void SetTransitionDuration(base::TimeDelta duration);
  35   base::TimeDelta GetTransitionDuration() const;
  36
  37   // Locks transition duration in |animator_|. When transition duration
  38   // is locked any subsequent changes to it are ignored until the
  39   // ScopedLayerAnimationSettings object that has locked the duration goes out
  40   // of scope.
  41   void LockTransitionDuration();
  42
  43   void SetTweenType(gfx::Tween::Type tween_type);
  44   gfx::Tween::Type GetTweenType() const;
  45
  46   void SetPreemptionStrategy(LayerAnimator::PreemptionStrategy strategy);
  47   LayerAnimator::PreemptionStrategy GetPreemptionStrategy() const;
  48
  49   // Sets the base layer whose animation will be countered.
  50   void SetInverselyAnimatedBaseLayer(Layer* base);
  51
  52   // Adds the layer to be counter-animated when a transform animation is
  53   // scheduled on the animator_. Must call SetInverselyAnimatedBaseLayer with
  54   // the layer associated with animator_ before animating.
  55   void AddInverselyAnimatedLayer(Layer* inverse_layer);
  56
  57  private:
  58   LayerAnimator* animator_;
  59   bool old_is_transition_duration_locked_;
  60   base::TimeDelta old_transition_duration_;
  61   gfx::Tween::Type old_tween_type_;
  62   LayerAnimator::PreemptionStrategy old_preemption_strategy_;
  63   std::set<ImplicitAnimationObserver*> observers_;
  64   scoped_ptr<InvertingObserver> inverse_observer_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(ScopedLayerAnimationSettings);
  67 };
  68
  69 }  // namespace ui
  70
  71 #endif  // UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_