ScrollableArea.cpp revision 2fc2651226baac27029e38c9d6ef883fa32084db 
1/*
2 * Copyright (c) 2010, Google Inc. All rights reserved.
3 * Copyright (C) 2008, 2011 Apple Inc. All Rights Reserved.
4 *
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10 * notice, this list of conditions and the following disclaimer.
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13 * in the documentation and/or other materials provided with the
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16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#include "ScrollableArea.h"
34
35#include "FloatPoint.h"
36#include "PlatformWheelEvent.h"
37#include "ScrollAnimator.h"
38#include "ScrollbarTheme.h"
39#include <wtf/PassOwnPtr.h>
40
41namespace WebCore {
42
43ScrollableArea::ScrollableArea()
44    : m_scrollAnimator(ScrollAnimator::create(this))
45    , m_constrainsScrollingToContentEdge(true)
46    , m_inLiveResize(false)
47{
48}
49
50ScrollableArea::~ScrollableArea()
51{
52}
53
54bool ScrollableArea::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
55{
56    ScrollbarOrientation orientation;
57    Scrollbar* scrollbar;
58    if (direction == ScrollUp || direction == ScrollDown) {
59        orientation = VerticalScrollbar;
60        scrollbar = verticalScrollbar();
61    } else {
62        orientation = HorizontalScrollbar;
63        scrollbar = horizontalScrollbar();
64    }
65
66    if (!scrollbar)
67        return false;
68
69    float step = 0;
70    switch (granularity) {
71    case ScrollByLine:
72        step = scrollbar->lineStep();
73        break;
74    case ScrollByPage:
75        step = scrollbar->pageStep();
76        break;
77    case ScrollByDocument:
78        step = scrollbar->totalSize();
79        break;
80    case ScrollByPixel:
81        step = scrollbar->pixelStep();
82        break;
83    }
84
85    if (direction == ScrollUp || direction == ScrollLeft)
86        multiplier = -multiplier;
87
88    return m_scrollAnimator->scroll(orientation, granularity, step, multiplier);
89}
90
91void ScrollableArea::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
92{
93    m_scrollAnimator->scrollToOffsetWithoutAnimation(offset);
94}
95
96void ScrollableArea::scrollToOffsetWithoutAnimation(ScrollbarOrientation orientation, float offset)
97{
98    if (orientation == HorizontalScrollbar)
99        scrollToXOffsetWithoutAnimation(offset);
100    else
101        scrollToYOffsetWithoutAnimation(offset);
102}
103
104void ScrollableArea::scrollToXOffsetWithoutAnimation(float x)
105{
106    scrollToOffsetWithoutAnimation(FloatPoint(x, m_scrollAnimator->currentPosition().y()));
107}
108
109void ScrollableArea::scrollToYOffsetWithoutAnimation(float y)
110{
111    scrollToOffsetWithoutAnimation(FloatPoint(m_scrollAnimator->currentPosition().x(), y));
112}
113
114void ScrollableArea::handleWheelEvent(PlatformWheelEvent& wheelEvent)
115{
116    m_scrollAnimator->handleWheelEvent(wheelEvent);
117}
118
119#if ENABLE(GESTURE_EVENTS)
120void ScrollableArea::handleGestureEvent(const PlatformGestureEvent& gestureEvent)
121{
122    m_scrollAnimator->handleGestureEvent(gestureEvent);
123}
124#endif
125
126void ScrollableArea::setScrollOffsetFromAnimation(const IntPoint& offset)
127{
128    // Tell the derived class to scroll its contents.
129    setScrollOffset(offset);
130
131    bool hasOverlayScrollbars = ScrollbarTheme::nativeTheme()->usesOverlayScrollbars();
132
133    // Tell the scrollbars to update their thumb postions.
134    if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) {
135        horizontalScrollbar->offsetDidChange();
136        if (hasOverlayScrollbars)
137            horizontalScrollbar->invalidate();
138    }
139    if (Scrollbar* verticalScrollbar = this->verticalScrollbar()) {
140        verticalScrollbar->offsetDidChange();
141        if (hasOverlayScrollbars)
142            verticalScrollbar->invalidate();
143    }
144}
145
146void ScrollableArea::willStartLiveResize()
147{
148    if (m_inLiveResize)
149        return;
150    m_inLiveResize = true;
151    scrollAnimator()->willStartLiveResize();
152}
153
154void ScrollableArea::willEndLiveResize()
155{
156    if (!m_inLiveResize)
157        return;
158    m_inLiveResize = false;
159    scrollAnimator()->willEndLiveResize();
160}
161
162void ScrollableArea::didAddVerticalScrollbar(Scrollbar* scrollbar)
163{
164    scrollAnimator()->didAddVerticalScrollbar(scrollbar);
165}
166
167void ScrollableArea::willRemoveVerticalScrollbar(Scrollbar* scrollbar)
168{
169    scrollAnimator()->willRemoveVerticalScrollbar(scrollbar);
170}
171
172void ScrollableArea::didAddHorizontalScrollbar(Scrollbar* scrollbar)
173{
174    scrollAnimator()->didAddHorizontalScrollbar(scrollbar);
175}
176
177void ScrollableArea::willRemoveHorizontalScrollbar(Scrollbar* scrollbar)
178{
179    scrollAnimator()->willRemoveHorizontalScrollbar(scrollbar);
180}
181
182} // namespace WebCore
183