--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderMarquee.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,316 @@
+/*
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ *
+ * Portions are Copyright (C) 1998 Netscape Communications Corporation.
+ *
+ * Other contributors:
+ * Robert O'Callahan <roc+@cs.cmu.edu>
+ * David Baron <dbaron@fas.harvard.edu>
+ * Christian Biesinger <cbiesinger@web.de>
+ * Randall Jesup <rjesup@wgate.com>
+ * Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
+ * Josh Soref <timeless@mac.com>
+ * Boris Zbarsky <bzbarsky@mit.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Alternatively, the contents of this file may be used under the terms
+ * of either the Mozilla Public License Version 1.1, found at
+ * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
+ * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
+ * (the "GPL"), in which case the provisions of the MPL or the GPL are
+ * applicable instead of those above. If you wish to allow use of your
+ * version of this file only under the terms of one of those two
+ * licenses (the MPL or the GPL) and not to allow others to use your
+ * version of this file under the LGPL, indicate your decision by
+ * deletingthe provisions above and replace them with the notice and
+ * other provisions required by the MPL or the GPL, as the case may be.
+ * If you do not delete the provisions above, a recipient may use your
+ * version of this file under any of the LGPL, the MPL or the GPL.
+ */
+
+#include "config.h"
+
+#include "RenderMarquee.h"
+
+#include "FrameView.h"
+#include "HTMLMarqueeElement.h"
+#include "HTMLNames.h"
+#include "RenderLayer.h"
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+RenderMarquee::RenderMarquee(RenderLayer* l)
+ : m_layer(l), m_currentLoop(0)
+ , m_totalLoops(0)
+ , m_timer(this, &RenderMarquee::timerFired)
+ , m_start(0), m_end(0), m_speed(0), m_reset(false)
+ , m_suspended(false), m_stopped(false), m_direction(MAUTO)
+{
+}
+
+int RenderMarquee::marqueeSpeed() const
+{
+ int result = m_layer->renderer()->style()->marqueeSpeed();
+ Node* n = m_layer->renderer()->node();
+ if (n && n->hasTagName(marqueeTag)) {
+ HTMLMarqueeElement* marqueeElt = static_cast<HTMLMarqueeElement*>(n);
+ result = max(result, marqueeElt->minimumDelay());
+ }
+ return result;
+}
+
+EMarqueeDirection RenderMarquee::direction() const
+{
+ // FIXME: Support the CSS3 "auto" value for determining the direction of the marquee.
+ // For now just map MAUTO to MBACKWARD
+ EMarqueeDirection result = m_layer->renderer()->style()->marqueeDirection();
+ TextDirection dir = m_layer->renderer()->style()->direction();
+ if (result == MAUTO)
+ result = MBACKWARD;
+ if (result == MFORWARD)
+ result = (dir == LTR) ? MRIGHT : MLEFT;
+ if (result == MBACKWARD)
+ result = (dir == LTR) ? MLEFT : MRIGHT;
+
+ // Now we have the real direction. Next we check to see if the increment is negative.
+ // If so, then we reverse the direction.
+ Length increment = m_layer->renderer()->style()->marqueeIncrement();
+ if (increment.isNegative())
+ result = static_cast<EMarqueeDirection>(-result);
+
+ return result;
+}
+
+bool RenderMarquee::isHorizontal() const
+{
+ return direction() == MLEFT || direction() == MRIGHT;
+}
+
+int RenderMarquee::computePosition(EMarqueeDirection dir, bool stopAtContentEdge)
+{
+ RenderBox* box = m_layer->renderBox();
+ ASSERT(box);
+ RenderStyle* s = box->style();
+ if (isHorizontal()) {
+ bool ltr = s->direction() == LTR;
+ int clientWidth = box->clientWidth();
+ int contentWidth = ltr ? box->rightmostPosition(true, false) : box->leftmostPosition(true, false);
+ if (ltr)
+ contentWidth += (box->paddingRight() - box->borderLeft());
+ else {
+ contentWidth = box->width() - contentWidth;
+ contentWidth += (box->paddingLeft() - box->borderRight());
+ }
+ if (dir == MRIGHT) {
+ if (stopAtContentEdge)
+ return max(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth));
+ else
+ return ltr ? contentWidth : clientWidth;
+ }
+ else {
+ if (stopAtContentEdge)
+ return min(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth));
+ else
+ return ltr ? -clientWidth : -contentWidth;
+ }
+ }
+ else {
+ int contentHeight = box->lowestPosition(true, false) -
+ box->borderTop() + box->paddingBottom();
+ int clientHeight = box->clientHeight();
+ if (dir == MUP) {
+ if (stopAtContentEdge)
+ return min(contentHeight - clientHeight, 0);
+ else
+ return -clientHeight;
+ }
+ else {
+ if (stopAtContentEdge)
+ return max(contentHeight - clientHeight, 0);
+ else
+ return contentHeight;
+ }
+ }
+}
+
+void RenderMarquee::start()
+{
+ if (m_timer.isActive() || m_layer->renderer()->style()->marqueeIncrement().isZero()
+#if ENABLE(WCSS) && ENABLE(XHTMLMP)
+ || (m_layer->renderer()->document()->isXHTMLMPDocument() && !m_layer->renderer()->style()->marqueeLoopCount())
+#endif
+ )
+ return;
+
+ // We may end up propagating a scroll event. It is important that we suspend events until
+ // the end of the function since they could delete the layer, including the marquee.
+ FrameView* frameView = m_layer->renderer()->document()->view();
+ if (frameView)
+ frameView->pauseScheduledEvents();
+
+ if (!m_suspended && !m_stopped) {
+ if (isHorizontal())
+ m_layer->scrollToOffset(m_start, 0, false, false);
+ else
+ m_layer->scrollToOffset(0, m_start, false, false);
+ }
+ else {
+ m_suspended = false;
+ m_stopped = false;
+ }
+
+ m_timer.startRepeating(speed() * 0.001);
+
+ if (frameView)
+ frameView->resumeScheduledEvents();
+}
+
+void RenderMarquee::suspend()
+{
+ m_timer.stop();
+ m_suspended = true;
+}
+
+void RenderMarquee::stop()
+{
+ m_timer.stop();
+ m_stopped = true;
+}
+
+void RenderMarquee::updateMarqueePosition()
+{
+ bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops);
+ if (activate) {
+ EMarqueeBehavior behavior = m_layer->renderer()->style()->marqueeBehavior();
+ m_start = computePosition(direction(), behavior == MALTERNATE);
+ m_end = computePosition(reverseDirection(), behavior == MALTERNATE || behavior == MSLIDE);
+ if (!m_stopped)
+ start();
+ }
+}
+
+void RenderMarquee::updateMarqueeStyle()
+{
+ RenderStyle* s = m_layer->renderer()->style();
+
+ if (m_direction != s->marqueeDirection() || (m_totalLoops != s->marqueeLoopCount() && m_currentLoop >= m_totalLoops))
+ m_currentLoop = 0; // When direction changes or our loopCount is a smaller number than our current loop, reset our loop.
+
+ m_totalLoops = s->marqueeLoopCount();
+ m_direction = s->marqueeDirection();
+
+ if (m_layer->renderer()->isHTMLMarquee()) {
+ // Hack for WinIE. In WinIE, a value of 0 or lower for the loop count for SLIDE means to only do
+ // one loop.
+ if (m_totalLoops <= 0 && s->marqueeBehavior() == MSLIDE)
+ m_totalLoops = 1;
+
+ // Hack alert: Set the white-space value to nowrap for horizontal marquees with inline children, thus ensuring
+ // all the text ends up on one line by default. Limit this hack to the <marquee> element to emulate
+ // WinIE's behavior. Someone using CSS3 can use white-space: nowrap on their own to get this effect.
+ // Second hack alert: Set the text-align back to auto. WinIE completely ignores text-align on the
+ // marquee element.
+ // FIXME: Bring these up with the CSS WG.
+ if (isHorizontal() && m_layer->renderer()->childrenInline()) {
+ s->setWhiteSpace(NOWRAP);
+ s->setTextAlign(TAAUTO);
+ }
+ }
+
+ // Marquee height hack!! Make sure that, if it is a horizontal marquee, the height attribute is overridden
+ // if it is smaller than the font size. If it is a vertical marquee and height is not specified, we default
+ // to a marquee of 200px.
+ if (isHorizontal()) {
+ if (s->height().isFixed() && s->height().value() < s->fontSize())
+ s->setHeight(Length(s->fontSize(), Fixed));
+ } else if (s->height().isAuto()) //vertical marquee with no specified height
+ s->setHeight(Length(200, Fixed));
+
+ if (speed() != marqueeSpeed()) {
+ m_speed = marqueeSpeed();
+ if (m_timer.isActive())
+ m_timer.startRepeating(speed() * 0.001);
+ }
+
+ // Check the loop count to see if we should now stop.
+ bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops);
+ if (activate && !m_timer.isActive())
+ m_layer->renderer()->setNeedsLayout(true);
+ else if (!activate && m_timer.isActive())
+ m_timer.stop();
+}
+
+void RenderMarquee::timerFired(Timer<RenderMarquee>*)
+{
+ if (m_layer->renderer()->needsLayout())
+ return;
+
+ if (m_reset) {
+ m_reset = false;
+ if (isHorizontal())
+ m_layer->scrollToXOffset(m_start);
+ else
+ m_layer->scrollToYOffset(m_start);
+ return;
+ }
+
+ RenderStyle* s = m_layer->renderer()->style();
+
+ int endPoint = m_end;
+ int range = m_end - m_start;
+ int newPos;
+ if (range == 0)
+ newPos = m_end;
+ else {
+ bool addIncrement = direction() == MUP || direction() == MLEFT;
+ bool isReversed = s->marqueeBehavior() == MALTERNATE && m_currentLoop % 2;
+ if (isReversed) {
+ // We're going in the reverse direction.
+ endPoint = m_start;
+ range = -range;
+ addIncrement = !addIncrement;
+ }
+ bool positive = range > 0;
+ int clientSize = (isHorizontal() ? m_layer->renderBox()->clientWidth() : m_layer->renderBox()->clientHeight());
+ int increment = max(1, abs(m_layer->renderer()->style()->marqueeIncrement().calcValue(clientSize)));
+ int currentPos = (isHorizontal() ? m_layer->scrollXOffset() : m_layer->scrollYOffset());
+ newPos = currentPos + (addIncrement ? increment : -increment);
+ if (positive)
+ newPos = min(newPos, endPoint);
+ else
+ newPos = max(newPos, endPoint);
+ }
+
+ if (newPos == endPoint) {
+ m_currentLoop++;
+ if (m_totalLoops > 0 && m_currentLoop >= m_totalLoops)
+ m_timer.stop();
+ else if (s->marqueeBehavior() != MALTERNATE)
+ m_reset = true;
+ }
+
+ if (isHorizontal())
+ m_layer->scrollToXOffset(newPos);
+ else
+ m_layer->scrollToYOffset(newPos);
+}
+
+} // namespace WebCore