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1 /* | 1 /* |
2 * Copyright (c) 2010, Google Inc. All rights reserved. | 2 * Copyright (c) 2010, Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 */ | 29 */ |
30 | 30 |
31 #ifndef ScrollAnimator_h | 31 #ifndef ScrollAnimator_h |
32 #define ScrollAnimator_h | 32 #define ScrollAnimator_h |
33 | 33 |
34 #include "platform/PlatformExport.h" | 34 #include "platform/PlatformExport.h" |
35 #include "platform/PlatformWheelEvent.h" | 35 #include "platform/PlatformWheelEvent.h" |
36 #include "platform/geometry/FloatSize.h" | 36 #include "platform/geometry/FloatSize.h" |
37 #include "platform/scroll/ScrollTypes.h" | 37 #include "platform/scroll/ScrollTypes.h" |
38 #include "wtf/FastAllocBase.h" | |
39 #include "wtf/Forward.h" | 38 #include "wtf/Forward.h" |
40 #include "wtf/Noncopyable.h" | 39 #include "wtf/RefCounted.h" |
41 | 40 |
42 namespace blink { | 41 namespace blink { |
43 | 42 |
44 class FloatPoint; | 43 class FloatPoint; |
45 class ScrollableArea; | 44 class ScrollableArea; |
46 class Scrollbar; | 45 class Scrollbar; |
47 | 46 |
48 class PLATFORM_EXPORT ScrollAnimator { | 47 class PLATFORM_EXPORT ScrollAnimator : public RefCounted<ScrollAnimator> { |
49 WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(ScrollAnimator); | |
50 public: | 48 public: |
51 static PassOwnPtr<ScrollAnimator> create(ScrollableArea*); | 49 static PassRefPtr<ScrollAnimator> create(ScrollableArea*); |
52 | 50 |
53 virtual ~ScrollAnimator(); | 51 virtual ~ScrollAnimator(); |
54 | 52 |
55 // Computes a scroll destination for the given parameters. Returns false if | 53 // Computes a scroll destination for the given parameters. Returns false if |
56 // already at the destination. Otherwise, starts scrolling towards the | 54 // already at the destination. Otherwise, starts scrolling towards the |
57 // destination and returns true. Scrolling may be immediate or animated. | 55 // destination and returns true. Scrolling may be immediate or animated. |
58 // The base class implementation always scrolls immediately, never animates. | 56 // The base class implementation always scrolls immediately, never animates. |
59 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, flo
at delta); | 57 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, flo
at delta); |
60 | 58 |
61 virtual void scrollToOffsetWithoutAnimation(const FloatPoint&); | 59 virtual void scrollToOffsetWithoutAnimation(const FloatPoint&); |
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110 float m_currentPosX; // We avoid using a FloatPoint in order to reduce | 108 float m_currentPosX; // We avoid using a FloatPoint in order to reduce |
111 float m_currentPosY; // subclass code complexity. | 109 float m_currentPosY; // subclass code complexity. |
112 | 110 |
113 private: | 111 private: |
114 float clampScrollPosition(ScrollbarOrientation, float); | 112 float clampScrollPosition(ScrollbarOrientation, float); |
115 }; | 113 }; |
116 | 114 |
117 } // namespace blink | 115 } // namespace blink |
118 | 116 |
119 #endif // ScrollAnimator_h | 117 #endif // ScrollAnimator_h |
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