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| 1 /* | |
| 2 * Copyright (c) 2010, Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #ifndef SKY_ENGINE_PLATFORM_SCROLL_SCROLLANIMATOR_H_ | |
| 32 #define SKY_ENGINE_PLATFORM_SCROLL_SCROLLANIMATOR_H_ | |
| 33 | |
| 34 #include "sky/engine/platform/PlatformExport.h" | |
| 35 #include "sky/engine/platform/geometry/FloatSize.h" | |
| 36 #include "sky/engine/platform/scroll/ScrollTypes.h" | |
| 37 #include "sky/engine/wtf/FastAllocBase.h" | |
| 38 #include "sky/engine/wtf/Forward.h" | |
| 39 #include "sky/engine/wtf/Noncopyable.h" | |
| 40 | |
| 41 namespace blink { | |
| 42 | |
| 43 class FloatPoint; | |
| 44 class ScrollableArea; | |
| 45 class Scrollbar; | |
| 46 | |
| 47 class PLATFORM_EXPORT ScrollAnimator { | |
| 48 WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(ScrollAnimator); | |
| 49 public: | |
| 50 static PassOwnPtr<ScrollAnimator> create(ScrollableArea*); | |
| 51 | |
| 52 virtual ~ScrollAnimator(); | |
| 53 | |
| 54 // Computes a scroll destination for the given parameters. Returns false if | |
| 55 // already at the destination. Otherwise, starts scrolling towards the | |
| 56 // destination and returns true. Scrolling may be immediate or animated. | |
| 57 // The base class implementation always scrolls immediately, never animates. | |
| 58 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, flo
at delta); | |
| 59 | |
| 60 virtual void scrollToOffsetWithoutAnimation(const FloatPoint&); | |
| 61 | |
| 62 ScrollableArea* scrollableArea() const { return m_scrollableArea; } | |
| 63 | |
| 64 virtual void setIsActive() { } | |
| 65 | |
| 66 void setCurrentPosition(const FloatPoint&); | |
| 67 FloatPoint currentPosition() const; | |
| 68 | |
| 69 virtual void cancelAnimations() { } | |
| 70 | |
| 71 virtual void contentsResized() const { } | |
| 72 | |
| 73 virtual void contentAreaDidShow() const { } | |
| 74 virtual void contentAreaDidHide() const { } | |
| 75 | |
| 76 virtual void finishCurrentScrollAnimations() { } | |
| 77 | |
| 78 virtual void didAddVerticalScrollbar(Scrollbar*) { } | |
| 79 virtual void willRemoveVerticalScrollbar(Scrollbar*) { } | |
| 80 virtual void didAddHorizontalScrollbar(Scrollbar*) { } | |
| 81 virtual void willRemoveHorizontalScrollbar(Scrollbar*) { } | |
| 82 | |
| 83 virtual bool shouldScrollbarParticipateInHitTesting(Scrollbar*) { return tru
e; } | |
| 84 | |
| 85 virtual void notifyContentAreaScrolled(const FloatSize&) { } | |
| 86 | |
| 87 protected: | |
| 88 explicit ScrollAnimator(ScrollableArea*); | |
| 89 | |
| 90 virtual void notifyPositionChanged(); | |
| 91 | |
| 92 ScrollableArea* m_scrollableArea; | |
| 93 float m_currentPosX; // We avoid using a FloatPoint in order to reduce | |
| 94 float m_currentPosY; // subclass code complexity. | |
| 95 | |
| 96 private: | |
| 97 float clampScrollPosition(ScrollbarOrientation, float); | |
| 98 }; | |
| 99 | |
| 100 } // namespace blink | |
| 101 | |
| 102 #endif // SKY_ENGINE_PLATFORM_SCROLL_SCROLLANIMATOR_H_ | |
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Chromium Code Reviews
Issue 879993004:
Remove ScrollableArea and Scrollbar (Closed)
Base URL: git@github.com:domokit/mojo.git@master