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 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 47 ScrollbarGroup::~ScrollbarGroup() 48 { 49 ASSERT(!m_horizontalScrollbar); 50 ASSERT(!m_verticalScrollbar); 51 } 52 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 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 89 void ScrollbarGroup::setLastMousePosition(const IntPoint& point) 90 { 91 m_lastMousePosition = point; 92 } 93 94 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 } 102 103 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 } 110 111 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 } 118 119 void ScrollbarGroup::invalidateScrollCornerRect(const IntRect&) 120 { 121 } 122 123 bool ScrollbarGroup::isActive() const 124 { 125 return true; 126 } 127 128 void ScrollbarGroup::setFrameRect(const IntRect& frameRect) 129 { 130 m_frameRect = frameRect; 131 } 132 133 IntRect ScrollbarGroup::scrollableAreaBoundingBox() const 134 { 135 return m_frameRect; 136 } 137 138 bool ScrollbarGroup::isScrollCornerVisible() const 139 { 140 return false; 141 } 142 143 void ScrollbarGroup::getTickmarks(Vector<IntRect>& tickmarks) const 144 { 145 if (m_verticalScrollbar) 146 m_verticalScrollbar->getTickmarks(tickmarks); 147 } 148 149 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 } 158 159 Scrollbar* ScrollbarGroup::horizontalScrollbar() const 160 { 161 return m_horizontalScrollbar ? m_horizontalScrollbar->scrollbar() : 0; 162 } 163 164 Scrollbar* ScrollbarGroup::verticalScrollbar() const 165 { 166 return m_verticalScrollbar ? m_verticalScrollbar->scrollbar() : 0; 167 } 168 169 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 } 175 176 IntPoint ScrollbarGroup::minimumScrollPosition() const 177 { 178 return IntPoint(); 179 } 180 181 IntPoint ScrollbarGroup::maximumScrollPosition() const 182 { 183 return IntPoint(contentsSize().width() - visibleWidth(), contentsSize().height() - visibleHeight()); 184 } 185 186 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 } 195 196 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 } 205 206 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 } 225 226 IntSize ScrollbarGroup::overhangAmount() const 227 { 228 return IntSize(); 229 } 230 231 IntPoint ScrollbarGroup::lastKnownMousePosition() const 232 { 233 return m_lastMousePosition; 234 } 235 236 bool ScrollbarGroup::shouldSuspendScrollAnimations() const 237 { 238 return false; 239 } 240 241 void ScrollbarGroup::scrollbarStyleChanged() 242 { 243 if (m_horizontalScrollbar) 244 m_horizontalScrollbar->scrollbarStyleChanged(); 245 if (m_verticalScrollbar) 246 m_verticalScrollbar->scrollbarStyleChanged(); 247 } 248 249 bool ScrollbarGroup::scrollbarsCanBeActive() const 250 { 251 return true; 252 } 253 254 bool ScrollbarGroup::userInputScrollable(ScrollbarOrientation orientation) const 255 { 256 return orientation == HorizontalScrollbar ? horizontalScrollbar() : verticalScrollbar(); 257 } 258 259 bool ScrollbarGroup::shouldPlaceVerticalScrollbarOnLeft() const 260 { 261 return false; 262 } 263 264 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
