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.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 IsScrollGestureInProgress() const = 0;
  22   virtual bool IsAnimating() const = 0;
  23   virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const = 0;
  24
  25   virtual bool Animate(base::TimeTicks now) = 0;
  26   virtual void DidScrollGestureBegin() = 0;
  27   virtual void DidScrollGestureEnd(base::TimeTicks now) = 0;
  28   virtual void DidProgrammaticallyUpdateScroll(base::TimeTicks now) = 0;
  29 };
  30
  31 }  // namespace cc
  32
  33 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_