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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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| 34 #include "ScrollTypes.h" | 34 #include "ScrollTypes.h" |
| 35 | 35 |
| 36 namespace WebCore { | 36 namespace WebCore { |
| 37 | 37 |
| 38 class ScrollbarClient; | 38 class ScrollbarClient; |
| 39 | 39 |
| 40 class ScrollAnimator { | 40 class ScrollAnimator { |
| 41 public: | 41 public: |
| 42 static ScrollAnimator* create(ScrollbarClient*); | 42 static ScrollAnimator* create(ScrollbarClient*); |
| 43 | 43 |
| 44 ScrollAnimator(ScrollbarClient* client) : m_client(client) { } | 44 ScrollAnimator(ScrollbarClient* client); |
| 45 virtual ~ScrollAnimator() { } | 45 virtual ~ScrollAnimator(); |
| 46 | 46 |
| 47 // Computes a scroll destination for the given parameters. Returns false if | 47 // Computes a scroll destination for the given parameters. Returns false if |
| 48 // already at the destination. Otherwise, starts scrolling towards the | 48 // already at the destination. Otherwise, starts scrolling towards the |
| 49 // destination and returns true. Scrolling may be immediate or animated. | 49 // destination and returns true. Scrolling may be immediate or animated. |
| 50 // The base class implementation always scrolls immediately, never animates. | 50 // The base class implementation always scrolls immediately, never animates. |
| 51 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, flo
at multiplier); | 51 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, flo
at multiplier); |
| 52 | 52 |
| 53 // Stops any animation in the given direction and updates the ScrollAnimator | 53 // Stops any animation in the given direction and updates the ScrollAnimator |
| 54 // with the current scroll position. This does not cause a callback to the | 54 // with the current scroll position. This does not cause a callback to the |
| 55 // ScrollbarClient. | 55 // ScrollbarClient. |
| 56 virtual void setScrollPositionAndStopAnimation(ScrollbarOrientation, float); | 56 virtual void setScrollPositionAndStopAnimation(ScrollbarOrientation, float); |
| 57 | 57 |
| 58 protected: | 58 protected: |
| 59 ScrollbarClient* m_client; | 59 ScrollbarClient* m_client; |
| 60 float m_currentPosX; // We avoid using a FloatPoint in order to reduce | 60 float m_currentPosX; // We avoid using a FloatPoint in order to reduce |
| 61 float m_currentPosY; // subclass code complexity. | 61 float m_currentPosY; // subclass code complexity. |
| 62 }; | 62 }; |
| 63 | 63 |
| 64 } // namespace WebCore | 64 } // namespace WebCore |
| 65 #endif | 65 #endif |
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