1 /*
2 * Copyright (C) 2011 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
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
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
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "web/ScrollbarGroup.h"
28
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"
34
35 using namespace WebCore;
36
37 namespace blink {
38
ScrollbarGroup(FrameView * frameView,const IntRect & frameRect)39 ScrollbarGroup::ScrollbarGroup(FrameView* frameView, const IntRect& frameRect)
40 : m_frameView(frameView)
41 , m_frameRect(frameRect)
42 , m_horizontalScrollbar(0)
43 , m_verticalScrollbar(0)
44 {
45 }
46
~ScrollbarGroup()47 ScrollbarGroup::~ScrollbarGroup()
48 {
49 ASSERT(!m_horizontalScrollbar);
50 ASSERT(!m_verticalScrollbar);
51 }
52
scrollbarCreated(WebPluginScrollbarImpl * scrollbar)53 void ScrollbarGroup::scrollbarCreated(WebPluginScrollbarImpl* scrollbar)
54 {
55 bool hadScrollbars = m_horizontalScrollbar || m_verticalScrollbar;
56 if (scrollbar->scrollbar()->orientation() == HorizontalScrollbar) {
57 ASSERT(!m_horizontalScrollbar);
58 m_horizontalScrollbar = scrollbar;
59 didAddScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
60 } else {
61 ASSERT(!m_verticalScrollbar);
62 m_verticalScrollbar = scrollbar;
63 didAddScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
64 }
65
66 if (!hadScrollbars) {
67 m_frameView->addScrollableArea(this);
68 m_frameView->setNeedsLayout();
69 }
70 }
71
scrollbarDestroyed(WebPluginScrollbarImpl * scrollbar)72 void ScrollbarGroup::scrollbarDestroyed(WebPluginScrollbarImpl* scrollbar)
73 {
74 if (scrollbar == m_horizontalScrollbar) {
75 willRemoveScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
76 m_horizontalScrollbar = 0;
77 } else {
78 ASSERT(scrollbar == m_verticalScrollbar);
79 willRemoveScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
80 m_verticalScrollbar = 0;
81 }
82
83 if (!m_horizontalScrollbar && !m_verticalScrollbar) {
84 m_frameView->removeScrollableArea(this);
85 m_frameView->setNeedsLayout();
86 }
87 }
88
setLastMousePosition(const IntPoint & point)89 void ScrollbarGroup::setLastMousePosition(const IntPoint& point)
90 {
91 m_lastMousePosition = point;
92 }
93
scrollSize(WebCore::ScrollbarOrientation orientation) const94 int ScrollbarGroup::scrollSize(WebCore::ScrollbarOrientation orientation) const
95 {
96 WebPluginScrollbarImpl* webScrollbar = orientation == HorizontalScrollbar ? m_horizontalScrollbar : m_verticalScrollbar;
97 if (!webScrollbar)
98 return 0;
99 Scrollbar* scrollbar = webScrollbar->scrollbar();
100 return scrollbar->totalSize() - scrollbar->visibleSize();
101 }
102
setScrollOffset(const IntPoint & offset)103 void ScrollbarGroup::setScrollOffset(const IntPoint& offset)
104 {
105 if (m_horizontalScrollbar && m_horizontalScrollbar->scrollOffset() != offset.x())
106 m_horizontalScrollbar->setScrollOffset(offset.x());
107 else if (m_verticalScrollbar && m_verticalScrollbar->scrollOffset() != offset.y())
108 m_verticalScrollbar->setScrollOffset(offset.y());
109 }
110
invalidateScrollbarRect(Scrollbar * scrollbar,const IntRect & rect)111 void ScrollbarGroup::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
112 {
113 if (m_horizontalScrollbar && scrollbar == m_horizontalScrollbar->scrollbar())
114 m_horizontalScrollbar->invalidateScrollbarRect(rect);
115 else if (m_verticalScrollbar && scrollbar == m_verticalScrollbar->scrollbar())
116 m_verticalScrollbar->invalidateScrollbarRect(rect);
117 }
118
invalidateScrollCornerRect(const IntRect &)119 void ScrollbarGroup::invalidateScrollCornerRect(const IntRect&)
120 {
121 }
122
isActive() const123 bool ScrollbarGroup::isActive() const
124 {
125 return true;
126 }
127
setFrameRect(const IntRect & frameRect)128 void ScrollbarGroup::setFrameRect(const IntRect& frameRect)
129 {
130 m_frameRect = frameRect;
131 }
132
scrollableAreaBoundingBox() const133 IntRect ScrollbarGroup::scrollableAreaBoundingBox() const
134 {
135 return m_frameRect;
136 }
137
isScrollCornerVisible() const138 bool ScrollbarGroup::isScrollCornerVisible() const
139 {
140 return false;
141 }
142
getTickmarks(Vector<IntRect> & tickmarks) const143 void ScrollbarGroup::getTickmarks(Vector<IntRect>& tickmarks) const
144 {
145 if (m_verticalScrollbar)
146 m_verticalScrollbar->getTickmarks(tickmarks);
147 }
148
convertFromContainingViewToScrollbar(const Scrollbar * scrollbar,const IntPoint & parentPoint) const149 IntPoint ScrollbarGroup::convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const
150 {
151 if (m_horizontalScrollbar && scrollbar == m_horizontalScrollbar->scrollbar())
152 return m_horizontalScrollbar->convertFromContainingViewToScrollbar(parentPoint);
153 if (m_verticalScrollbar && scrollbar == m_verticalScrollbar->scrollbar())
154 return m_verticalScrollbar->convertFromContainingViewToScrollbar(parentPoint);
155 BLINK_ASSERT_NOT_REACHED();
156 return IntPoint();
157 }
158
horizontalScrollbar() const159 Scrollbar* ScrollbarGroup::horizontalScrollbar() const
160 {
161 return m_horizontalScrollbar ? m_horizontalScrollbar->scrollbar() : 0;
162 }
163
verticalScrollbar() const164 Scrollbar* ScrollbarGroup::verticalScrollbar() const
165 {
166 return m_verticalScrollbar ? m_verticalScrollbar->scrollbar() : 0;
167 }
168
scrollPosition() const169 IntPoint ScrollbarGroup::scrollPosition() const
170 {
171 int x = m_horizontalScrollbar ? m_horizontalScrollbar->scrollOffset() : 0;
172 int y = m_verticalScrollbar ? m_verticalScrollbar->scrollOffset() : 0;
173 return IntPoint(x, y);
174 }
175
minimumScrollPosition() const176 IntPoint ScrollbarGroup::minimumScrollPosition() const
177 {
178 return IntPoint();
179 }
180
maximumScrollPosition() const181 IntPoint ScrollbarGroup::maximumScrollPosition() const
182 {
183 return IntPoint(contentsSize().width() - visibleWidth(), contentsSize().height() - visibleHeight());
184 }
185
visibleHeight() const186 int ScrollbarGroup::visibleHeight() const
187 {
188 if (m_verticalScrollbar)
189 return m_verticalScrollbar->scrollbar()->height();
190 if (m_horizontalScrollbar)
191 return m_horizontalScrollbar->scrollbar()->height();
192 BLINK_ASSERT_NOT_REACHED();
193 return 0;
194 }
195
visibleWidth() const196 int ScrollbarGroup::visibleWidth() const
197 {
198 if (m_horizontalScrollbar)
199 return m_horizontalScrollbar->scrollbar()->width();
200 if (m_verticalScrollbar)
201 return m_verticalScrollbar->scrollbar()->width();
202 BLINK_ASSERT_NOT_REACHED();
203 return 0;
204 }
205
contentsSize() const206 IntSize ScrollbarGroup::contentsSize() const
207 {
208 IntSize size;
209 if (m_horizontalScrollbar)
210 size.setWidth(m_horizontalScrollbar->scrollbar()->totalSize());
211 else if (m_verticalScrollbar) {
212 size.setWidth(m_verticalScrollbar->scrollbar()->x());
213 if (m_verticalScrollbar->scrollbar()->isOverlayScrollbar())
214 size.expand(WebPluginScrollbar::defaultThickness(), 0);
215 }
216 if (m_verticalScrollbar)
217 size.setHeight(m_verticalScrollbar->scrollbar()->totalSize());
218 else if (m_horizontalScrollbar) {
219 size.setHeight(m_horizontalScrollbar->scrollbar()->y());
220 if (m_horizontalScrollbar->scrollbar()->isOverlayScrollbar())
221 size.expand(0, WebPluginScrollbar::defaultThickness());
222 }
223 return size;
224 }
225
overhangAmount() const226 IntSize ScrollbarGroup::overhangAmount() const
227 {
228 return IntSize();
229 }
230
lastKnownMousePosition() const231 IntPoint ScrollbarGroup::lastKnownMousePosition() const
232 {
233 return m_lastMousePosition;
234 }
235
shouldSuspendScrollAnimations() const236 bool ScrollbarGroup::shouldSuspendScrollAnimations() const
237 {
238 return false;
239 }
240
scrollbarStyleChanged()241 void ScrollbarGroup::scrollbarStyleChanged()
242 {
243 if (m_horizontalScrollbar)
244 m_horizontalScrollbar->scrollbarStyleChanged();
245 if (m_verticalScrollbar)
246 m_verticalScrollbar->scrollbarStyleChanged();
247 }
248
scrollbarsCanBeActive() const249 bool ScrollbarGroup::scrollbarsCanBeActive() const
250 {
251 return true;
252 }
253
userInputScrollable(ScrollbarOrientation orientation) const254 bool ScrollbarGroup::userInputScrollable(ScrollbarOrientation orientation) const
255 {
256 return orientation == HorizontalScrollbar ? horizontalScrollbar() : verticalScrollbar();
257 }
258
shouldPlaceVerticalScrollbarOnLeft() const259 bool ScrollbarGroup::shouldPlaceVerticalScrollbarOnLeft() const
260 {
261 return false;
262 }
263
pageStep(ScrollbarOrientation orientation) const264 int ScrollbarGroup::pageStep(ScrollbarOrientation orientation) const
265 {
266 int length;
267 if (orientation == VerticalScrollbar) {
268 if (!m_verticalScrollbar)
269 return 0;
270
271 length = m_verticalScrollbar->scrollbar()->height();
272 } else {
273 if (!m_horizontalScrollbar)
274 return 0;
275
276 length = m_horizontalScrollbar->scrollbar()->width();
277 }
278
279 int pageStep = std::max(
280 static_cast<int>(static_cast<float>(length) * ScrollableArea::minFractionToStepWhenPaging()),
281 length - ScrollableArea::maxOverlapBetweenPages());
282
283 return std::max(pageStep, 1);
284 }
285
286 } // namespace blink
287