cc/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 CCScrollbarAnimationController_h
   6 #define CCScrollbarAnimationController_h
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "FloatPoint.h"
  10 #include "IntSize.h"
  11
  12 namespace cc {
  13
  14 class CCLayerImpl;
  15 class CCScrollbarLayerImpl;
  16
  17 // This abstract class represents the compositor-side analogy of ScrollbarAnimator.
  18 // Individual platforms should subclass it to provide specialized implementation.
  19 class CCScrollbarAnimationController {
  20 public:
  21     static scoped_ptr<CCScrollbarAnimationController> create(CCLayerImpl* scrollLayer);
  22
  23     virtual ~CCScrollbarAnimationController();
  24
  25     virtual bool animate(double monotonicTime);
  26     void didPinchGestureBegin();
  27     void didPinchGestureUpdate();
  28     void didPinchGestureEnd();
  29     void updateScrollOffset(CCLayerImpl* scrollLayer);
  30
  31     void setHorizontalScrollbarLayer(CCScrollbarLayerImpl* layer) { m_horizontalScrollbarLayer = layer; }
  32     CCScrollbarLayerImpl* horizontalScrollbarLayer() const { return m_horizontalScrollbarLayer; }
  33
  34     void setVerticalScrollbarLayer(CCScrollbarLayerImpl* layer) { m_verticalScrollbarLayer = layer; }
  35     CCScrollbarLayerImpl* verticalScrollbarLayer() const { return m_verticalScrollbarLayer; }
  36
  37     FloatPoint currentPos() const { return m_currentPos; }
  38     IntSize totalSize() const { return m_totalSize; }
  39     IntSize maximum() const { return m_maximum; }
  40
  41     virtual void didPinchGestureBeginAtTime(double monotonicTime) { }
  42     virtual void didPinchGestureUpdateAtTime(double monotonicTime) { }
  43     virtual void didPinchGestureEndAtTime(double monotonicTime) { }
  44     virtual void updateScrollOffsetAtTime(CCLayerImpl* scrollLayer, double monotonicTime);
  45
  46 protected:
  47     explicit CCScrollbarAnimationController(CCLayerImpl* scrollLayer);
  48
  49 private:
  50     static IntSize getScrollLayerBounds(const CCLayerImpl*);
  51
  52     // Beware of dangling pointer. Always update these during tree synchronization.
  53     CCScrollbarLayerImpl* m_horizontalScrollbarLayer;
  54     CCScrollbarLayerImpl* m_verticalScrollbarLayer;
  55
  56     FloatPoint m_currentPos;
  57     IntSize m_totalSize;
  58     IntSize m_maximum;
  59 };
  60
  61 } // namespace cc
  62
  63 #endif // CCScrollbarAnimationController_h