1 /* 2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. 3 * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 4 * 5 * Portions are Copyright (C) 1998 Netscape Communications Corporation. 6 * 7 * Other contributors: 8 * Robert O'Callahan <roc+@cs.cmu.edu> 9 * David Baron <dbaron (at) fas.harvard.edu> 10 * Christian Biesinger <cbiesinger (at) web.de> 11 * Randall Jesup <rjesup (at) wgate.com> 12 * Roland Mainz <roland.mainz (at) informatik.med.uni-giessen.de> 13 * Josh Soref <timeless (at) mac.com> 14 * Boris Zbarsky <bzbarsky (at) mit.edu> 15 * 16 * This library is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU Lesser General Public 18 * License as published by the Free Software Foundation; either 19 * version 2.1 of the License, or (at your option) any later version. 20 * 21 * This library is distributed in the hope that it will be useful, 22 * but WITHOUT ANY WARRANTY; without even the implied warranty of 23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 * Lesser General Public License for more details. 25 * 26 * You should have received a copy of the GNU Lesser General Public 27 * License along with this library; if not, write to the Free Software 28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 29 * 30 * Alternatively, the contents of this file may be used under the terms 31 * of either the Mozilla Public License Version 1.1, found at 32 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public 33 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html 34 * (the "GPL"), in which case the provisions of the MPL or the GPL are 35 * applicable instead of those above. If you wish to allow use of your 36 * version of this file only under the terms of one of those two 37 * licenses (the MPL or the GPL) and not to allow others to use your 38 * version of this file under the LGPL, indicate your decision by 39 * deletingthe provisions above and replace them with the notice and 40 * other provisions required by the MPL or the GPL, as the case may be. 41 * If you do not delete the provisions above, a recipient may use your 42 * version of this file under any of the LGPL, the MPL or the GPL. 43 */ 44 45 #include "config.h" 46 47 #include "RenderMarquee.h" 48 49 #include "FrameView.h" 50 #include "HTMLMarqueeElement.h" 51 #include "HTMLNames.h" 52 #include "RenderLayer.h" 53 54 using namespace std; 55 56 namespace WebCore { 57 58 using namespace HTMLNames; 59 60 RenderMarquee::RenderMarquee(RenderLayer* l) 61 : m_layer(l), m_currentLoop(0) 62 , m_totalLoops(0) 63 , m_timer(this, &RenderMarquee::timerFired) 64 , m_start(0), m_end(0), m_speed(0), m_reset(false) 65 , m_suspended(false), m_stopped(false), m_direction(MAUTO) 66 { 67 } 68 69 RenderMarquee::~RenderMarquee() 70 { 71 } 72 73 int RenderMarquee::marqueeSpeed() const 74 { 75 int result = m_layer->renderer()->style()->marqueeSpeed(); 76 Node* n = m_layer->renderer()->node(); 77 if (n && n->hasTagName(marqueeTag)) { 78 HTMLMarqueeElement* marqueeElt = static_cast<HTMLMarqueeElement*>(n); 79 result = max(result, marqueeElt->minimumDelay()); 80 } 81 return result; 82 } 83 84 EMarqueeDirection RenderMarquee::direction() const 85 { 86 // FIXME: Support the CSS3 "auto" value for determining the direction of the marquee. 87 // For now just map MAUTO to MBACKWARD 88 EMarqueeDirection result = m_layer->renderer()->style()->marqueeDirection(); 89 TextDirection dir = m_layer->renderer()->style()->direction(); 90 if (result == MAUTO) 91 result = MBACKWARD; 92 if (result == MFORWARD) 93 result = (dir == LTR) ? MRIGHT : MLEFT; 94 if (result == MBACKWARD) 95 result = (dir == LTR) ? MLEFT : MRIGHT; 96 97 // Now we have the real direction. Next we check to see if the increment is negative. 98 // If so, then we reverse the direction. 99 Length increment = m_layer->renderer()->style()->marqueeIncrement(); 100 if (increment.isNegative()) 101 result = static_cast<EMarqueeDirection>(-result); 102 103 return result; 104 } 105 106 bool RenderMarquee::isHorizontal() const 107 { 108 return direction() == MLEFT || direction() == MRIGHT; 109 } 110 111 int RenderMarquee::computePosition(EMarqueeDirection dir, bool stopAtContentEdge) 112 { 113 RenderBox* box = m_layer->renderBox(); 114 ASSERT(box); 115 RenderStyle* s = box->style(); 116 if (isHorizontal()) { 117 bool ltr = s->isLeftToRightDirection(); 118 int clientWidth = box->clientWidth(); 119 int contentWidth = ltr ? box->maxXLayoutOverflow() : box->minXLayoutOverflow(); 120 if (ltr) 121 contentWidth += (box->paddingRight() - box->borderLeft()); 122 else { 123 contentWidth = box->width() - contentWidth; 124 contentWidth += (box->paddingLeft() - box->borderRight()); 125 } 126 if (dir == MRIGHT) { 127 if (stopAtContentEdge) 128 return max(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth)); 129 else 130 return ltr ? contentWidth : clientWidth; 131 } 132 else { 133 if (stopAtContentEdge) 134 return min(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth)); 135 else 136 return ltr ? -clientWidth : -contentWidth; 137 } 138 } 139 else { 140 int contentHeight = box->maxYLayoutOverflow() - box->borderTop() + box->paddingBottom(); 141 int clientHeight = box->clientHeight(); 142 if (dir == MUP) { 143 if (stopAtContentEdge) 144 return min(contentHeight - clientHeight, 0); 145 else 146 return -clientHeight; 147 } 148 else { 149 if (stopAtContentEdge) 150 return max(contentHeight - clientHeight, 0); 151 else 152 return contentHeight; 153 } 154 } 155 } 156 157 void RenderMarquee::start() 158 { 159 if (m_timer.isActive() || m_layer->renderer()->style()->marqueeIncrement().isZero() 160 #if ENABLE(WCSS) && ENABLE(XHTMLMP) 161 || (m_layer->renderer()->document()->isXHTMLMPDocument() && !m_layer->renderer()->style()->marqueeLoopCount()) 162 #endif 163 ) 164 return; 165 166 // We may end up propagating a scroll event. It is important that we suspend events until 167 // the end of the function since they could delete the layer, including the marquee. 168 FrameView* frameView = m_layer->renderer()->document()->view(); 169 if (frameView) 170 frameView->pauseScheduledEvents(); 171 172 if (!m_suspended && !m_stopped) { 173 if (isHorizontal()) 174 m_layer->scrollToOffset(m_start, 0); 175 else 176 m_layer->scrollToOffset(0, m_start); 177 } 178 else { 179 m_suspended = false; 180 m_stopped = false; 181 } 182 183 m_timer.startRepeating(speed() * 0.001); 184 185 if (frameView) 186 frameView->resumeScheduledEvents(); 187 } 188 189 void RenderMarquee::suspend() 190 { 191 m_timer.stop(); 192 m_suspended = true; 193 } 194 195 void RenderMarquee::stop() 196 { 197 m_timer.stop(); 198 m_stopped = true; 199 } 200 201 void RenderMarquee::updateMarqueePosition() 202 { 203 bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops); 204 if (activate) { 205 EMarqueeBehavior behavior = m_layer->renderer()->style()->marqueeBehavior(); 206 m_start = computePosition(direction(), behavior == MALTERNATE); 207 m_end = computePosition(reverseDirection(), behavior == MALTERNATE || behavior == MSLIDE); 208 if (!m_stopped) 209 start(); 210 } 211 } 212 213 void RenderMarquee::updateMarqueeStyle() 214 { 215 RenderStyle* s = m_layer->renderer()->style(); 216 217 if (m_direction != s->marqueeDirection() || (m_totalLoops != s->marqueeLoopCount() && m_currentLoop >= m_totalLoops)) 218 m_currentLoop = 0; // When direction changes or our loopCount is a smaller number than our current loop, reset our loop. 219 220 m_totalLoops = s->marqueeLoopCount(); 221 m_direction = s->marqueeDirection(); 222 223 if (m_layer->renderer()->isHTMLMarquee()) { 224 // Hack for WinIE. In WinIE, a value of 0 or lower for the loop count for SLIDE means to only do 225 // one loop. 226 if (m_totalLoops <= 0 && s->marqueeBehavior() == MSLIDE) 227 m_totalLoops = 1; 228 229 // Hack alert: Set the white-space value to nowrap for horizontal marquees with inline children, thus ensuring 230 // all the text ends up on one line by default. Limit this hack to the <marquee> element to emulate 231 // WinIE's behavior. Someone using CSS3 can use white-space: nowrap on their own to get this effect. 232 // Second hack alert: Set the text-align back to auto. WinIE completely ignores text-align on the 233 // marquee element. 234 // FIXME: Bring these up with the CSS WG. 235 if (isHorizontal() && m_layer->renderer()->childrenInline()) { 236 s->setWhiteSpace(NOWRAP); 237 s->setTextAlign(TAAUTO); 238 } 239 } 240 241 // Marquee height hack!! Make sure that, if it is a horizontal marquee, the height attribute is overridden 242 // if it is smaller than the font size. If it is a vertical marquee and height is not specified, we default 243 // to a marquee of 200px. 244 if (isHorizontal()) { 245 if (s->height().isFixed() && s->height().value() < s->fontSize()) 246 s->setHeight(Length(s->fontSize(), Fixed)); 247 } else if (s->height().isAuto()) //vertical marquee with no specified height 248 s->setHeight(Length(200, Fixed)); 249 250 if (speed() != marqueeSpeed()) { 251 m_speed = marqueeSpeed(); 252 if (m_timer.isActive()) 253 m_timer.startRepeating(speed() * 0.001); 254 } 255 256 // Check the loop count to see if we should now stop. 257 bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops); 258 if (activate && !m_timer.isActive()) 259 m_layer->renderer()->setNeedsLayout(true); 260 else if (!activate && m_timer.isActive()) 261 m_timer.stop(); 262 } 263 264 void RenderMarquee::timerFired(Timer<RenderMarquee>*) 265 { 266 if (m_layer->renderer()->needsLayout()) 267 return; 268 269 if (m_reset) { 270 m_reset = false; 271 if (isHorizontal()) 272 m_layer->scrollToXOffset(m_start); 273 else 274 m_layer->scrollToYOffset(m_start); 275 return; 276 } 277 278 RenderStyle* s = m_layer->renderer()->style(); 279 280 int endPoint = m_end; 281 int range = m_end - m_start; 282 int newPos; 283 if (range == 0) 284 newPos = m_end; 285 else { 286 bool addIncrement = direction() == MUP || direction() == MLEFT; 287 bool isReversed = s->marqueeBehavior() == MALTERNATE && m_currentLoop % 2; 288 if (isReversed) { 289 // We're going in the reverse direction. 290 endPoint = m_start; 291 range = -range; 292 addIncrement = !addIncrement; 293 } 294 bool positive = range > 0; 295 int clientSize = (isHorizontal() ? m_layer->renderBox()->clientWidth() : m_layer->renderBox()->clientHeight()); 296 int increment = abs(m_layer->renderer()->style()->marqueeIncrement().calcValue(clientSize)); 297 int currentPos = (isHorizontal() ? m_layer->scrollXOffset() : m_layer->scrollYOffset()); 298 newPos = currentPos + (addIncrement ? increment : -increment); 299 if (positive) 300 newPos = min(newPos, endPoint); 301 else 302 newPos = max(newPos, endPoint); 303 } 304 305 if (newPos == endPoint) { 306 m_currentLoop++; 307 if (m_totalLoops > 0 && m_currentLoop >= m_totalLoops) 308 m_timer.stop(); 309 else if (s->marqueeBehavior() != MALTERNATE) 310 m_reset = true; 311 } 312 313 if (isHorizontal()) 314 m_layer->scrollToXOffset(newPos); 315 else 316 m_layer->scrollToYOffset(newPos); 317 } 318 319 } // namespace WebCore 320
