2 * Copyright (C) 2011 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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27 #include "web/ScrollbarGroup.h"
29 #include "core/frame/FrameView.h"
30 #include "platform/scroll/Scrollbar.h"
31 #include "platform/scroll/ScrollbarTheme.h"
32 #include "public/platform/WebRect.h"
33 #include "web/WebPluginScrollbarImpl.h"
37 ScrollbarGroup::ScrollbarGroup(FrameView* frameView, const IntRect& frameRect)
38 : m_frameView(frameView)
39 , m_frameRect(frameRect)
40 , m_horizontalScrollbar(0)
41 , m_verticalScrollbar(0)
45 ScrollbarGroup::~ScrollbarGroup()
47 ASSERT(!m_horizontalScrollbar);
48 ASSERT(!m_verticalScrollbar);
51 void ScrollbarGroup::scrollbarCreated(WebPluginScrollbarImpl* scrollbar)
53 bool hadScrollbars = m_horizontalScrollbar || m_verticalScrollbar;
54 if (scrollbar->scrollbar()->orientation() == HorizontalScrollbar) {
55 ASSERT(!m_horizontalScrollbar);
56 m_horizontalScrollbar = scrollbar;
57 didAddScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
59 ASSERT(!m_verticalScrollbar);
60 m_verticalScrollbar = scrollbar;
61 didAddScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
65 m_frameView->addScrollableArea(this);
66 m_frameView->setNeedsLayout();
70 void ScrollbarGroup::scrollbarDestroyed(WebPluginScrollbarImpl* scrollbar)
72 if (scrollbar == m_horizontalScrollbar) {
73 willRemoveScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
74 m_horizontalScrollbar = 0;
76 ASSERT(scrollbar == m_verticalScrollbar);
77 willRemoveScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
78 m_verticalScrollbar = 0;
81 if (!m_horizontalScrollbar && !m_verticalScrollbar) {
82 m_frameView->removeScrollableArea(this);
83 m_frameView->setNeedsLayout();
87 void ScrollbarGroup::setLastMousePosition(const IntPoint& point)
89 m_lastMousePosition = point;
92 int ScrollbarGroup::scrollSize(ScrollbarOrientation orientation) const
94 WebPluginScrollbarImpl* webScrollbar = orientation == HorizontalScrollbar ? m_horizontalScrollbar : m_verticalScrollbar;
97 Scrollbar* scrollbar = webScrollbar->scrollbar();
98 return scrollbar->totalSize() - scrollbar->visibleSize();
101 void ScrollbarGroup::setScrollOffset(const IntPoint& offset)
103 if (m_horizontalScrollbar && m_horizontalScrollbar->scrollOffset() != offset.x())
104 m_horizontalScrollbar->setScrollOffset(offset.x());
105 else if (m_verticalScrollbar && m_verticalScrollbar->scrollOffset() != offset.y())
106 m_verticalScrollbar->setScrollOffset(offset.y());
109 void ScrollbarGroup::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
111 if (m_horizontalScrollbar && scrollbar == m_horizontalScrollbar->scrollbar())
112 m_horizontalScrollbar->invalidateScrollbarRect(rect);
113 else if (m_verticalScrollbar && scrollbar == m_verticalScrollbar->scrollbar())
114 m_verticalScrollbar->invalidateScrollbarRect(rect);
117 void ScrollbarGroup::invalidateScrollCornerRect(const IntRect&)
121 bool ScrollbarGroup::isActive() const
126 void ScrollbarGroup::setFrameRect(const IntRect& frameRect)
128 m_frameRect = frameRect;
131 IntRect ScrollbarGroup::scrollableAreaBoundingBox() const
136 bool ScrollbarGroup::isScrollCornerVisible() const
141 void ScrollbarGroup::getTickmarks(Vector<IntRect>& tickmarks) const
143 if (m_verticalScrollbar)
144 m_verticalScrollbar->getTickmarks(tickmarks);
147 IntPoint ScrollbarGroup::convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const
149 if (m_horizontalScrollbar && scrollbar == m_horizontalScrollbar->scrollbar())
150 return m_horizontalScrollbar->convertFromContainingViewToScrollbar(parentPoint);
151 if (m_verticalScrollbar && scrollbar == m_verticalScrollbar->scrollbar())
152 return m_verticalScrollbar->convertFromContainingViewToScrollbar(parentPoint);
153 BLINK_ASSERT_NOT_REACHED();
157 Scrollbar* ScrollbarGroup::horizontalScrollbar() const
159 return m_horizontalScrollbar ? m_horizontalScrollbar->scrollbar() : 0;
162 Scrollbar* ScrollbarGroup::verticalScrollbar() const
164 return m_verticalScrollbar ? m_verticalScrollbar->scrollbar() : 0;
167 IntPoint ScrollbarGroup::scrollPosition() const
169 int x = m_horizontalScrollbar ? m_horizontalScrollbar->scrollOffset() : 0;
170 int y = m_verticalScrollbar ? m_verticalScrollbar->scrollOffset() : 0;
171 return IntPoint(x, y);
174 IntPoint ScrollbarGroup::minimumScrollPosition() const
179 IntPoint ScrollbarGroup::maximumScrollPosition() const
181 return IntPoint(contentsSize().width() - visibleWidth(), contentsSize().height() - visibleHeight());
184 int ScrollbarGroup::visibleHeight() const
186 if (m_verticalScrollbar)
187 return m_verticalScrollbar->scrollbar()->height();
188 if (m_horizontalScrollbar)
189 return m_horizontalScrollbar->scrollbar()->height();
190 BLINK_ASSERT_NOT_REACHED();
194 int ScrollbarGroup::visibleWidth() const
196 if (m_horizontalScrollbar)
197 return m_horizontalScrollbar->scrollbar()->width();
198 if (m_verticalScrollbar)
199 return m_verticalScrollbar->scrollbar()->width();
200 BLINK_ASSERT_NOT_REACHED();
204 IntSize ScrollbarGroup::contentsSize() const
207 if (m_horizontalScrollbar)
208 size.setWidth(m_horizontalScrollbar->scrollbar()->totalSize());
209 else if (m_verticalScrollbar) {
210 size.setWidth(m_verticalScrollbar->scrollbar()->x());
211 if (m_verticalScrollbar->scrollbar()->isOverlayScrollbar())
212 size.expand(WebPluginScrollbar::defaultThickness(), 0);
214 if (m_verticalScrollbar)
215 size.setHeight(m_verticalScrollbar->scrollbar()->totalSize());
216 else if (m_horizontalScrollbar) {
217 size.setHeight(m_horizontalScrollbar->scrollbar()->y());
218 if (m_horizontalScrollbar->scrollbar()->isOverlayScrollbar())
219 size.expand(0, WebPluginScrollbar::defaultThickness());
224 IntSize ScrollbarGroup::overhangAmount() const
229 IntPoint ScrollbarGroup::lastKnownMousePosition() const
231 return m_lastMousePosition;
234 bool ScrollbarGroup::shouldSuspendScrollAnimations() const
239 void ScrollbarGroup::scrollbarStyleChanged()
241 if (m_horizontalScrollbar)
242 m_horizontalScrollbar->scrollbarStyleChanged();
243 if (m_verticalScrollbar)
244 m_verticalScrollbar->scrollbarStyleChanged();
247 bool ScrollbarGroup::scrollbarsCanBeActive() const
252 bool ScrollbarGroup::userInputScrollable(ScrollbarOrientation orientation) const
254 return orientation == HorizontalScrollbar ? horizontalScrollbar() : verticalScrollbar();
257 bool ScrollbarGroup::shouldPlaceVerticalScrollbarOnLeft() const
262 int ScrollbarGroup::pageStep(ScrollbarOrientation orientation) const
265 if (orientation == VerticalScrollbar) {
266 if (!m_verticalScrollbar)
269 length = m_verticalScrollbar->scrollbar()->height();
271 if (!m_horizontalScrollbar)
274 length = m_horizontalScrollbar->scrollbar()->width();
277 int pageStep = std::max(
278 static_cast<int>(static_cast<float>(length) * ScrollableArea::minFractionToStepWhenPaging()),
279 length - ScrollableArea::maxOverlapBetweenPages());
281 return std::max(pageStep, 1);