Code drop from //branches/cupcake/...@124589

1 files changed, 311 insertions, 0 deletions

diff --git a/WebCore/rendering/RenderMarquee.cpp b/WebCore/rendering/RenderMarquee.cpp
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+++ b/WebCore/rendering/RenderMarquee.cpp
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+/*
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * 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* elt = m_layer->renderer()->element();
+    if (elt && elt->hasTagName(marqueeTag)) {
+        HTMLMarqueeElement* marqueeElt = static_cast<HTMLMarqueeElement*>(elt);
+        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)
+{
+    RenderObject* o = m_layer->renderer();
+    RenderStyle* s = o->style();
+    if (isHorizontal()) {
+        bool ltr = s->direction() == LTR;
+        int clientWidth = o->clientWidth();
+        int contentWidth = ltr ? o->rightmostPosition(true, false) : o->leftmostPosition(true, false);
+        if (ltr)
+            contentWidth += (o->paddingRight() - o->borderLeft());
+        else {
+            contentWidth = o->width() - contentWidth;
+            contentWidth += (o->paddingLeft() - o->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 = m_layer->renderer()->lowestPosition(true, false) - 
+                            m_layer->renderer()->borderTop() + m_layer->renderer()->paddingBottom();
+        int clientHeight = m_layer->renderer()->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())
+        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->renderer()->clientWidth() : m_layer->renderer()->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
+