cc/animation/scrollbar_animation_controller.h

   1 // Copyright 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 CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
   6 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
   7
   8 #include "base/time/time.h"
   9 #include "cc/base/cc_export.h"
  10 #include "ui/gfx/vector2d_f.h"
  11
  12 namespace cc {
  13
  14 // This abstract class represents the compositor-side analogy of
  15 // ScrollbarAnimator.  Individual platforms should subclass it to provide
  16 // specialized implementation.
  17 class CC_EXPORT ScrollbarAnimationController {
  18  public:
  19   virtual ~ScrollbarAnimationController() {}
  20
  21   virtual bool IsAnimating() const = 0;
  22   virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const = 0;
  23
  24   virtual bool Animate(base::TimeTicks now) = 0;
  25   virtual void DidScrollGestureBegin() = 0;
  26   virtual void DidScrollGestureEnd(base::TimeTicks now) = 0;
  27   virtual void DidMouseMoveOffScrollbar(base::TimeTicks now) = 0;
  28
  29   // Returns true if we should start an animation.
  30   virtual bool DidScrollUpdate(base::TimeTicks now) = 0;
  31   virtual bool DidMouseMoveNear(base::TimeTicks now, float distance) = 0;
  32 };
  33
  34 }  // namespace cc
  35
  36 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_