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 int RenderMarquee::marqueeSpeed() const 70 { 71 int result = m_layer->renderer()->style()->marqueeSpeed(); 72 Node* n = m_layer->renderer()->node(); 73 if (n && n->hasTagName(marqueeTag)) { 74 HTMLMarqueeElement* marqueeElt = static_cast<HTMLMarqueeElement*>(n); 75 result = max(result, marqueeElt->minimumDelay()); 76 } 77 return result; 78 } 79 80 EMarqueeDirection RenderMarquee::direction() const 81 { 82 // FIXME: Support the CSS3 "auto" value for determining the direction of the marquee. 83 // For now just map MAUTO to MBACKWARD 84 EMarqueeDirection result = m_layer->renderer()->style()->marqueeDirection(); 85 TextDirection dir = m_layer->renderer()->style()->direction(); 86 if (result == MAUTO) 87 result = MBACKWARD; 88 if (result == MFORWARD) 89 result = (dir == LTR) ? MRIGHT : MLEFT; 90 if (result == MBACKWARD) 91 result = (dir == LTR) ? MLEFT : MRIGHT; 92 93 // Now we have the real direction. Next we check to see if the increment is negative. 94 // If so, then we reverse the direction. 95 Length increment = m_layer->renderer()->style()->marqueeIncrement(); 96 if (increment.isNegative()) 97 result = static_cast<EMarqueeDirection>(-result); 98 99 return result; 100 } 101 102 bool RenderMarquee::isHorizontal() const 103 { 104 return direction() == MLEFT || direction() == MRIGHT; 105 } 106 107 int RenderMarquee::computePosition(EMarqueeDirection dir, bool stopAtContentEdge) 108 { 109 RenderBox* box = m_layer->renderBox(); 110 ASSERT(box); 111 RenderStyle* s = box->style(); 112 if (isHorizontal()) { 113 bool ltr = s->direction() == LTR; 114 int clientWidth = box->clientWidth(); 115 int contentWidth = ltr ? box->rightmostPosition(true, false) : box->leftmostPosition(true, false); 116 if (ltr) 117 contentWidth += (box->paddingRight() - box->borderLeft()); 118 else { 119 contentWidth = box->width() - contentWidth; 120 contentWidth += (box->paddingLeft() - box->borderRight()); 121 } 122 if (dir == MRIGHT) { 123 if (stopAtContentEdge) 124 return max(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth)); 125 else 126 return ltr ? contentWidth : clientWidth; 127 } 128 else { 129 if (stopAtContentEdge) 130 return min(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth)); 131 else 132 return ltr ? -clientWidth : -contentWidth; 133 } 134 } 135 else { 136 int contentHeight = box->lowestPosition(true, false) - 137 box->borderTop() + box->paddingBottom(); 138 int clientHeight = box->clientHeight(); 139 if (dir == MUP) { 140 if (stopAtContentEdge) 141 return min(contentHeight - clientHeight, 0); 142 else 143 return -clientHeight; 144 } 145 else { 146 if (stopAtContentEdge) 147 return max(contentHeight - clientHeight, 0); 148 else 149 return contentHeight; 150 } 151 } 152 } 153 154 void RenderMarquee::start() 155 { 156 if (m_timer.isActive() || m_layer->renderer()->style()->marqueeIncrement().isZero() 157 #if ENABLE(WCSS) && ENABLE(XHTMLMP) 158 || (m_layer->renderer()->document()->isXHTMLMPDocument() && !m_layer->renderer()->style()->marqueeLoopCount()) 159 #endif 160 ) 161 return; 162 163 // We may end up propagating a scroll event. It is important that we suspend events until 164 // the end of the function since they could delete the layer, including the marquee. 165 FrameView* frameView = m_layer->renderer()->document()->view(); 166 if (frameView) 167 frameView->pauseScheduledEvents(); 168 169 if (!m_suspended && !m_stopped) { 170 if (isHorizontal()) 171 m_layer->scrollToOffset(m_start, 0, false, false); 172 else 173 m_layer->scrollToOffset(0, m_start, false, false); 174 } 175 else { 176 m_suspended = false; 177 m_stopped = false; 178 } 179 180 m_timer.startRepeating(speed() * 0.001); 181 182 if (frameView) 183 frameView->resumeScheduledEvents(); 184 } 185 186 void RenderMarquee::suspend() 187 { 188 m_timer.stop(); 189 m_suspended = true; 190 } 191 192 void RenderMarquee::stop() 193 { 194 m_timer.stop(); 195 m_stopped = true; 196 } 197 198 void RenderMarquee::updateMarqueePosition() 199 { 200 bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops); 201 if (activate) { 202 EMarqueeBehavior behavior = m_layer->renderer()->style()->marqueeBehavior(); 203 m_start = computePosition(direction(), behavior == MALTERNATE); 204 m_end = computePosition(reverseDirection(), behavior == MALTERNATE || behavior == MSLIDE); 205 if (!m_stopped) 206 start(); 207 } 208 } 209 210 void RenderMarquee::updateMarqueeStyle() 211 { 212 RenderStyle* s = m_layer->renderer()->style(); 213 214 if (m_direction != s->marqueeDirection() || (m_totalLoops != s->marqueeLoopCount() && m_currentLoop >= m_totalLoops)) 215 m_currentLoop = 0; // When direction changes or our loopCount is a smaller number than our current loop, reset our loop. 216 217 m_totalLoops = s->marqueeLoopCount(); 218 m_direction = s->marqueeDirection(); 219 220 if (m_layer->renderer()->isHTMLMarquee()) { 221 // Hack for WinIE. In WinIE, a value of 0 or lower for the loop count for SLIDE means to only do 222 // one loop. 223 if (m_totalLoops <= 0 && s->marqueeBehavior() == MSLIDE) 224 m_totalLoops = 1; 225 226 // Hack alert: Set the white-space value to nowrap for horizontal marquees with inline children, thus ensuring 227 // all the text ends up on one line by default. Limit this hack to the <marquee> element to emulate 228 // WinIE's behavior. Someone using CSS3 can use white-space: nowrap on their own to get this effect. 229 // Second hack alert: Set the text-align back to auto. WinIE completely ignores text-align on the 230 // marquee element. 231 // FIXME: Bring these up with the CSS WG. 232 if (isHorizontal() && m_layer->renderer()->childrenInline()) { 233 s->setWhiteSpace(NOWRAP); 234 s->setTextAlign(TAAUTO); 235 } 236 } 237 238 // Marquee height hack!! Make sure that, if it is a horizontal marquee, the height attribute is overridden 239 // if it is smaller than the font size. If it is a vertical marquee and height is not specified, we default 240 // to a marquee of 200px. 241 if (isHorizontal()) { 242 if (s->height().isFixed() && s->height().value() < s->fontSize()) 243 s->setHeight(Length(s->fontSize(), Fixed)); 244 } else if (s->height().isAuto()) //vertical marquee with no specified height 245 s->setHeight(Length(200, Fixed)); 246 247 if (speed() != marqueeSpeed()) { 248 m_speed = marqueeSpeed(); 249 if (m_timer.isActive()) 250 m_timer.startRepeating(speed() * 0.001); 251 } 252 253 // Check the loop count to see if we should now stop. 254 bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops); 255 if (activate && !m_timer.isActive()) 256 m_layer->renderer()->setNeedsLayout(true); 257 else if (!activate && m_timer.isActive()) 258 m_timer.stop(); 259 } 260 261 void RenderMarquee::timerFired(Timer<RenderMarquee>*) 262 { 263 if (m_layer->renderer()->needsLayout()) 264 return; 265 266 if (m_reset) { 267 m_reset = false; 268 if (isHorizontal()) 269 m_layer->scrollToXOffset(m_start); 270 else 271 m_layer->scrollToYOffset(m_start); 272 return; 273 } 274 275 RenderStyle* s = m_layer->renderer()->style(); 276 277 int endPoint = m_end; 278 int range = m_end - m_start; 279 int newPos; 280 if (range == 0) 281 newPos = m_end; 282 else { 283 bool addIncrement = direction() == MUP || direction() == MLEFT; 284 bool isReversed = s->marqueeBehavior() == MALTERNATE && m_currentLoop % 2; 285 if (isReversed) { 286 // We're going in the reverse direction. 287 endPoint = m_start; 288 range = -range; 289 addIncrement = !addIncrement; 290 } 291 bool positive = range > 0; 292 int clientSize = (isHorizontal() ? m_layer->renderBox()->clientWidth() : m_layer->renderBox()->clientHeight()); 293 int increment = max(1, abs(m_layer->renderer()->style()->marqueeIncrement().calcValue(clientSize))); 294 int currentPos = (isHorizontal() ? m_layer->scrollXOffset() : m_layer->scrollYOffset()); 295 newPos = currentPos + (addIncrement ? increment : -increment); 296 if (positive) 297 newPos = min(newPos, endPoint); 298 else 299 newPos = max(newPos, endPoint); 300 } 301 302 if (newPos == endPoint) { 303 m_currentLoop++; 304 if (m_totalLoops > 0 && m_currentLoop >= m_totalLoops) 305 m_timer.stop(); 306 else if (s->marqueeBehavior() != MALTERNATE) 307 m_reset = true; 308 } 309 310 if (isHorizontal()) 311 m_layer->scrollToXOffset(newPos); 312 else 313 m_layer->scrollToYOffset(newPos); 314 } 315 316 } // namespace WebCore 317
