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 CC_SCROLLBAR_ANIMATION_CONTROLLER_H_
   6 #define CC_SCROLLBAR_ANIMATION_CONTROLLER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/cc_export.h"
  10 #include "ui/gfx/size.h"
  11 #include "ui/gfx/vector2d.h"
  12 #include "ui/gfx/vector2d_f.h"
  13
  14 namespace cc {
  15
  16 class LayerImpl;
  17 class ScrollbarLayerImpl;
  18
  19 // This abstract class represents the compositor-side analogy of ScrollbarAnimator.
  20 // Individual platforms should subclass it to provide specialized implementation.
  21 class CC_EXPORT ScrollbarAnimationController {
  22 public:
  23     static scoped_ptr<ScrollbarAnimationController> create(LayerImpl* scrollLayer);
  24
  25     virtual ~ScrollbarAnimationController();
  26
  27     virtual bool animate(double monotonicTime);
  28     void didPinchGestureBegin();
  29     void didPinchGestureUpdate();
  30     void didPinchGestureEnd();
  31     void updateScrollOffset(LayerImpl* scrollLayer);
  32
  33     void setHorizontalScrollbarLayer(ScrollbarLayerImpl* layer) { m_horizontalScrollbarLayer = layer; }
  34     ScrollbarLayerImpl* horizontalScrollbarLayer() const { return m_horizontalScrollbarLayer; }
  35
  36     void setVerticalScrollbarLayer(ScrollbarLayerImpl* layer) { m_verticalScrollbarLayer = layer; }
  37     ScrollbarLayerImpl* verticalScrollbarLayer() const { return m_verticalScrollbarLayer; }
  38
  39     gfx::Vector2dF currentOffset() const { return m_currentOffset; }
  40     gfx::Size totalSize() const { return m_totalSize; }
  41     gfx::Vector2d maximum() const { return m_maximum; }
  42
  43     virtual void didPinchGestureBeginAtTime(double monotonicTime) { }
  44     virtual void didPinchGestureUpdateAtTime(double monotonicTime) { }
  45     virtual void didPinchGestureEndAtTime(double monotonicTime) { }
  46     virtual void updateScrollOffsetAtTime(LayerImpl* scrollLayer, double monotonicTime);
  47
  48 protected:
  49     explicit ScrollbarAnimationController(LayerImpl* scrollLayer);
  50
  51 private:
  52     static gfx::Size getScrollLayerBounds(const LayerImpl*);
  53
  54     // Beware of dangling pointer. Always update these during tree synchronization.
  55     ScrollbarLayerImpl* m_horizontalScrollbarLayer;
  56     ScrollbarLayerImpl* m_verticalScrollbarLayer;
  57
  58     gfx::Vector2dF m_currentOffset;
  59     gfx::Size m_totalSize;
  60     gfx::Vector2d m_maximum;
  61 };
  62
  63 } // namespace cc
  64
  65 #endif  // CC_SCROLLBAR_ANIMATION_CONTROLLER_H_