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 "ScrollbarGroup.h" 28 29 #include "WebPluginScrollbarImpl.h" 30 #include "core/frame/FrameView.h" 31 #include "platform/scroll/Scrollbar.h" 32 #include "platform/scroll/ScrollbarTheme.h" 33 #include "public/platform/WebRect.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 ScrollableArea* ScrollbarGroup::enclosingScrollableArea() const 129 { 130 // FIXME: Return a parent scrollable area that can be scrolled. 131 return 0; 132 } 133 134 void ScrollbarGroup::setFrameRect(const IntRect& frameRect) 135 { 136 m_frameRect = frameRect; 137 } 138 139 IntRect ScrollbarGroup::scrollableAreaBoundingBox() const 140 { 141 return m_frameRect; 142 } 143 144 bool ScrollbarGroup::isScrollCornerVisible() const 145 { 146 return false; 147 } 148 149 void ScrollbarGroup::getTickmarks(Vector<IntRect>& tickmarks) const 150 { 151 if (m_verticalScrollbar) 152 m_verticalScrollbar->getTickmarks(tickmarks); 153 } 154 155 IntPoint ScrollbarGroup::convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const 156 { 157 if (m_horizontalScrollbar && scrollbar == m_horizontalScrollbar->scrollbar()) 158 return m_horizontalScrollbar->convertFromContainingViewToScrollbar(parentPoint); 159 if (m_verticalScrollbar && scrollbar == m_verticalScrollbar->scrollbar()) 160 return m_verticalScrollbar->convertFromContainingViewToScrollbar(parentPoint); 161 BLINK_ASSERT_NOT_REACHED(); 162 return IntPoint(); 163 } 164 165 Scrollbar* ScrollbarGroup::horizontalScrollbar() const 166 { 167 return m_horizontalScrollbar ? m_horizontalScrollbar->scrollbar() : 0; 168 } 169 170 Scrollbar* ScrollbarGroup::verticalScrollbar() const 171 { 172 return m_verticalScrollbar ? m_verticalScrollbar->scrollbar() : 0; 173 } 174 175 IntPoint ScrollbarGroup::scrollPosition() const 176 { 177 int x = m_horizontalScrollbar ? m_horizontalScrollbar->scrollOffset() : 0; 178 int y = m_verticalScrollbar ? m_verticalScrollbar->scrollOffset() : 0; 179 return IntPoint(x, y); 180 } 181 182 IntPoint ScrollbarGroup::minimumScrollPosition() const 183 { 184 return IntPoint(); 185 } 186 187 IntPoint ScrollbarGroup::maximumScrollPosition() const 188 { 189 return IntPoint(contentsSize().width() - visibleWidth(), contentsSize().height() - visibleHeight()); 190 } 191 192 int ScrollbarGroup::visibleHeight() const 193 { 194 if (m_verticalScrollbar) 195 return m_verticalScrollbar->scrollbar()->height(); 196 if (m_horizontalScrollbar) 197 return m_horizontalScrollbar->scrollbar()->height(); 198 BLINK_ASSERT_NOT_REACHED(); 199 return 0; 200 } 201 202 int ScrollbarGroup::visibleWidth() const 203 { 204 if (m_horizontalScrollbar) 205 return m_horizontalScrollbar->scrollbar()->width(); 206 if (m_verticalScrollbar) 207 return m_verticalScrollbar->scrollbar()->width(); 208 BLINK_ASSERT_NOT_REACHED(); 209 return 0; 210 } 211 212 IntSize ScrollbarGroup::contentsSize() const 213 { 214 IntSize size; 215 if (m_horizontalScrollbar) 216 size.setWidth(m_horizontalScrollbar->scrollbar()->totalSize()); 217 else if (m_verticalScrollbar) { 218 size.setWidth(m_verticalScrollbar->scrollbar()->x()); 219 if (m_verticalScrollbar->scrollbar()->isOverlayScrollbar()) 220 size.expand(WebPluginScrollbar::defaultThickness(), 0); 221 } 222 if (m_verticalScrollbar) 223 size.setHeight(m_verticalScrollbar->scrollbar()->totalSize()); 224 else if (m_horizontalScrollbar) { 225 size.setHeight(m_horizontalScrollbar->scrollbar()->y()); 226 if (m_horizontalScrollbar->scrollbar()->isOverlayScrollbar()) 227 size.expand(0, WebPluginScrollbar::defaultThickness()); 228 } 229 return size; 230 } 231 232 IntSize ScrollbarGroup::overhangAmount() const 233 { 234 return IntSize(); 235 } 236 237 IntPoint ScrollbarGroup::lastKnownMousePosition() const 238 { 239 return m_lastMousePosition; 240 } 241 242 bool ScrollbarGroup::shouldSuspendScrollAnimations() const 243 { 244 return false; 245 } 246 247 void ScrollbarGroup::scrollbarStyleChanged(int, bool forceUpdate) 248 { 249 if (!forceUpdate) 250 return; 251 252 if (m_horizontalScrollbar) 253 m_horizontalScrollbar->scrollbarStyleChanged(); 254 if (m_verticalScrollbar) 255 m_verticalScrollbar->scrollbarStyleChanged(); 256 } 257 258 bool ScrollbarGroup::scrollbarsCanBeActive() const 259 { 260 return true; 261 } 262 263 bool ScrollbarGroup::userInputScrollable(ScrollbarOrientation orientation) const 264 { 265 return orientation == HorizontalScrollbar ? horizontalScrollbar() : verticalScrollbar(); 266 } 267 268 bool ScrollbarGroup::shouldPlaceVerticalScrollbarOnLeft() const 269 { 270 return false; 271 } 272 273 int ScrollbarGroup::pageStep(ScrollbarOrientation orientation) const 274 { 275 int length; 276 if (orientation == VerticalScrollbar) { 277 if (!m_verticalScrollbar) 278 return 0; 279 280 length = m_verticalScrollbar->scrollbar()->height(); 281 } else { 282 if (!m_horizontalScrollbar) 283 return 0; 284 285 length = m_horizontalScrollbar->scrollbar()->width(); 286 } 287 288 int pageStep = std::max( 289 static_cast<int>(static_cast<float>(length) * ScrollableArea::minFractionToStepWhenPaging()), 290 length - ScrollableArea::maxOverlapBetweenPages()); 291 292 return std::max(pageStep, 1); 293 } 294 295 } // namespace blink 296
