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 ScrollAnimator_h 32 #define ScrollAnimator_h 33 34 #include "ScrollTypes.h" 35 #include <wtf/Forward.h> 36 37 namespace WebCore { 38 39 class FloatPoint; 40 class PlatformWheelEvent; 41 class ScrollableArea; 42 class Scrollbar; 43 44 #if ENABLE(GESTURE_EVENTS) 45 class PlatformGestureEvent; 46 #endif 47 48 class 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, float multiplier); 59 60 virtual void scrollToOffsetWithoutAnimation(const FloatPoint&); 61 62 ScrollableArea* scrollableArea() const { return m_scrollableArea; } 63 64 virtual void handleWheelEvent(PlatformWheelEvent&); 65 #if ENABLE(GESTURE_EVENTS) 66 virtual void handleGestureEvent(const PlatformGestureEvent&); 67 #endif 68 69 FloatPoint currentPosition() const; 70 71 virtual void cancelAnimations() { } 72 73 virtual void contentAreaWillPaint() const { } 74 virtual void mouseEnteredContentArea() const { } 75 virtual void mouseExitedContentArea() const { } 76 virtual void mouseMovedInContentArea() const { } 77 virtual void willStartLiveResize() { } 78 virtual void contentsResized() const { } 79 virtual void willEndLiveResize() { } 80 virtual void contentAreaDidShow() const { } 81 virtual void contentAreaDidHide() const { } 82 83 virtual void didAddVerticalScrollbar(Scrollbar*) { } 84 virtual void willRemoveVerticalScrollbar(Scrollbar*) { } 85 virtual void didAddHorizontalScrollbar(Scrollbar*) { } 86 virtual void willRemoveHorizontalScrollbar(Scrollbar*) { } 87 88 protected: 89 ScrollAnimator(ScrollableArea*); 90 91 virtual void notityPositionChanged(); 92 93 ScrollableArea* m_scrollableArea; 94 float m_currentPosX; // We avoid using a FloatPoint in order to reduce 95 float m_currentPosY; // subclass code complexity. 96 }; 97 98 } // namespace WebCore 99 100 #endif // ScrollAnimator_h 101
