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 namespace blink { 36 37 ScrollbarGroup::ScrollbarGroup(FrameView* frameView, const IntRect& frameRect) 38 : m_frameView(frameView) 39 , m_frameRect(frameRect) 40 , m_horizontalScrollbar(0) 41 , m_verticalScrollbar(0) 42 { 43 } 44 45 ScrollbarGroup::~ScrollbarGroup() 46 { 47 ASSERT(!m_horizontalScrollbar); 48 ASSERT(!m_verticalScrollbar); 49 } 50 51 void ScrollbarGroup::scrollbarCreated(WebPluginScrollbarImpl* scrollbar) 52 { 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); 58 } else { 59 ASSERT(!m_verticalScrollbar); 60 m_verticalScrollbar = scrollbar; 61 didAddScrollbar(scrollbar->scrollbar(), VerticalScrollbar); 62 } 63 64 if (!hadScrollbars) { 65 m_frameView->addScrollableArea(this); 66 m_frameView->setNeedsLayout(); 67 } 68 } 69 70 void ScrollbarGroup::scrollbarDestroyed(WebPluginScrollbarImpl* scrollbar) 71 { 72 if (scrollbar == m_horizontalScrollbar) { 73 willRemoveScrollbar(scrollbar->scrollbar(), HorizontalScrollbar); 74 m_horizontalScrollbar = 0; 75 } else { 76 ASSERT(scrollbar == m_verticalScrollbar); 77 willRemoveScrollbar(scrollbar->scrollbar(), VerticalScrollbar); 78 m_verticalScrollbar = 0; 79 } 80 81 if (!m_horizontalScrollbar && !m_verticalScrollbar) { 82 m_frameView->removeScrollableArea(this); 83 m_frameView->setNeedsLayout(); 84 } 85 } 86 87 void ScrollbarGroup::setLastMousePosition(const IntPoint& point) 88 { 89 m_lastMousePosition = point; 90 } 91 92 int ScrollbarGroup::scrollSize(ScrollbarOrientation orientation) const 93 { 94 WebPluginScrollbarImpl* webScrollbar = orientation == HorizontalScrollbar ? m_horizontalScrollbar : m_verticalScrollbar; 95 if (!webScrollbar) 96 return 0; 97 Scrollbar* scrollbar = webScrollbar->scrollbar(); 98 return scrollbar->totalSize() - scrollbar->visibleSize(); 99 } 100 101 void ScrollbarGroup::setScrollOffset(const IntPoint& offset) 102 { 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()); 107 } 108 109 void ScrollbarGroup::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect) 110 { 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); 115 } 116 117 void ScrollbarGroup::invalidateScrollCornerRect(const IntRect&) 118 { 119 } 120 121 bool ScrollbarGroup::isActive() const 122 { 123 return true; 124 } 125 126 void ScrollbarGroup::setFrameRect(const IntRect& frameRect) 127 { 128 m_frameRect = frameRect; 129 } 130 131 IntRect ScrollbarGroup::scrollableAreaBoundingBox() const 132 { 133 return m_frameRect; 134 } 135 136 bool ScrollbarGroup::isScrollCornerVisible() const 137 { 138 return false; 139 } 140 141 void ScrollbarGroup::getTickmarks(Vector<IntRect>& tickmarks) const 142 { 143 if (m_verticalScrollbar) 144 m_verticalScrollbar->getTickmarks(tickmarks); 145 } 146 147 IntPoint ScrollbarGroup::convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const 148 { 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(); 154 return IntPoint(); 155 } 156 157 Scrollbar* ScrollbarGroup::horizontalScrollbar() const 158 { 159 return m_horizontalScrollbar ? m_horizontalScrollbar->scrollbar() : 0; 160 } 161 162 Scrollbar* ScrollbarGroup::verticalScrollbar() const 163 { 164 return m_verticalScrollbar ? m_verticalScrollbar->scrollbar() : 0; 165 } 166 167 IntPoint ScrollbarGroup::scrollPosition() const 168 { 169 int x = m_horizontalScrollbar ? m_horizontalScrollbar->scrollOffset() : 0; 170 int y = m_verticalScrollbar ? m_verticalScrollbar->scrollOffset() : 0; 171 return IntPoint(x, y); 172 } 173 174 IntPoint ScrollbarGroup::minimumScrollPosition() const 175 { 176 return IntPoint(); 177 } 178 179 IntPoint ScrollbarGroup::maximumScrollPosition() const 180 { 181 return IntPoint(contentsSize().width() - visibleWidth(), contentsSize().height() - visibleHeight()); 182 } 183 184 int ScrollbarGroup::visibleHeight() const 185 { 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(); 191 return 0; 192 } 193 194 int ScrollbarGroup::visibleWidth() const 195 { 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(); 201 return 0; 202 } 203 204 IntSize ScrollbarGroup::contentsSize() const 205 { 206 IntSize size; 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); 213 } 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()); 220 } 221 return size; 222 } 223 224 IntSize ScrollbarGroup::overhangAmount() const 225 { 226 return IntSize(); 227 } 228 229 IntPoint ScrollbarGroup::lastKnownMousePosition() const 230 { 231 return m_lastMousePosition; 232 } 233 234 bool ScrollbarGroup::shouldSuspendScrollAnimations() const 235 { 236 return false; 237 } 238 239 void ScrollbarGroup::scrollbarStyleChanged() 240 { 241 if (m_horizontalScrollbar) 242 m_horizontalScrollbar->scrollbarStyleChanged(); 243 if (m_verticalScrollbar) 244 m_verticalScrollbar->scrollbarStyleChanged(); 245 } 246 247 bool ScrollbarGroup::scrollbarsCanBeActive() const 248 { 249 return true; 250 } 251 252 bool ScrollbarGroup::userInputScrollable(ScrollbarOrientation orientation) const 253 { 254 return orientation == HorizontalScrollbar ? horizontalScrollbar() : verticalScrollbar(); 255 } 256 257 bool ScrollbarGroup::shouldPlaceVerticalScrollbarOnLeft() const 258 { 259 return false; 260 } 261 262 int ScrollbarGroup::pageStep(ScrollbarOrientation orientation) const 263 { 264 int length; 265 if (orientation == VerticalScrollbar) { 266 if (!m_verticalScrollbar) 267 return 0; 268 269 length = m_verticalScrollbar->scrollbar()->height(); 270 } else { 271 if (!m_horizontalScrollbar) 272 return 0; 273 274 length = m_horizontalScrollbar->scrollbar()->width(); 275 } 276 277 int pageStep = std::max( 278 static_cast<int>(static_cast<float>(length) * ScrollableArea::minFractionToStepWhenPaging()), 279 length - ScrollableArea::maxOverlapBetweenPages()); 280 281 return std::max(pageStep, 1); 282 } 283 284 } // namespace blink 285
