#include "config.h"
#include "RenderMarquee.h"
#include "FrameView.h"
#include "HTMLMarqueeElement.h"
#include "HTMLNames.h"
#include "RenderLayer.h"
#include "RenderView.h"
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)
{
}
RenderMarquee::~RenderMarquee()
{
}
int RenderMarquee::marqueeSpeed() const
{
int result = m_layer->renderer().style().marqueeSpeed();
Element* element = m_layer->renderer().element();
if (element && element->hasTagName(marqueeTag))
result = std::max(result, toHTMLMarqueeElement(element)->minimumDelay());
return result;
}
EMarqueeDirection RenderMarquee::direction() const
{
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;
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& boxStyle = box->style();
if (isHorizontal()) {
bool ltr = boxStyle.isLeftToRightDirection();
LayoutUnit clientWidth = box->clientWidth();
LayoutUnit contentWidth = ltr ? box->maxPreferredLogicalWidth() : box->minPreferredLogicalWidth();
if (ltr)
contentWidth += (box->paddingRight() - box->borderLeft());
else {
contentWidth = box->width() - contentWidth;
contentWidth += (box->paddingLeft() - box->borderRight());
}
if (dir == MRIGHT) {
if (stopAtContentEdge)
return std::max<LayoutUnit>(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth));
else
return ltr ? contentWidth : clientWidth;
}
else {
if (stopAtContentEdge)
return std::min<LayoutUnit>(0, ltr ? (contentWidth - clientWidth) : (clientWidth - contentWidth));
else
return ltr ? -clientWidth : -contentWidth;
}
}
else {
int contentHeight = box->layoutOverflowRect().maxY() - box->borderTop() + box->paddingBottom();
int clientHeight = box->clientHeight();
if (dir == MUP) {
if (stopAtContentEdge)
return std::min(contentHeight - clientHeight, 0);
else
return -clientHeight;
}
else {
if (stopAtContentEdge)
return std::max(contentHeight - clientHeight, 0);
else
return contentHeight;
}
}
}
void RenderMarquee::start()
{
if (m_timer.isActive() || m_layer->renderer().style().marqueeIncrement().isZero())
return;
if (!m_suspended && !m_stopped) {
if (isHorizontal())
m_layer->scrollToOffset(IntSize(m_start, 0));
else
m_layer->scrollToOffset(IntSize(0, m_start));
}
else {
m_suspended = false;
m_stopped = false;
}
m_timer.startRepeating(speed() * 0.001);
}
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& style = m_layer->renderer().style();
if (m_direction != style.marqueeDirection() || (m_totalLoops != style.marqueeLoopCount() && m_currentLoop >= m_totalLoops))
m_currentLoop = 0;
m_totalLoops = style.marqueeLoopCount();
m_direction = style.marqueeDirection();
if (m_layer->renderer().isHTMLMarquee()) {
if (m_totalLoops <= 0 && style.marqueeBehavior() == MSLIDE)
m_totalLoops = 1;
if (isHorizontal() && m_layer->renderer().childrenInline()) {
style.setWhiteSpace(NOWRAP);
style.setTextAlign(TASTART);
}
}
if (!isHorizontal() && style.height().isAuto())
style.setHeight(Length(200, Fixed));
if (speed() != marqueeSpeed()) {
m_speed = marqueeSpeed();
if (m_timer.isActive())
m_timer.startRepeating(speed() * 0.001);
}
bool activate = (m_totalLoops <= 0 || m_currentLoop < m_totalLoops);
if (activate && !m_timer.isActive())
m_layer->renderer().setNeedsLayout();
else if (!activate && m_timer.isActive())
m_timer.stop();
}
void RenderMarquee::timerFired(Timer<RenderMarquee>&)
{
if (m_layer->renderer().view().needsLayout())
return;
if (m_reset) {
m_reset = false;
if (isHorizontal())
m_layer->scrollToXOffset(m_start);
else
m_layer->scrollToYOffset(m_start);
return;
}
const RenderStyle& style = 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 = style.marqueeBehavior() == MALTERNATE && m_currentLoop % 2;
if (isReversed) {
endPoint = m_start;
range = -range;
addIncrement = !addIncrement;
}
bool positive = range > 0;
int clientSize = (isHorizontal() ? m_layer->renderBox()->clientWidth() : m_layer->renderBox()->clientHeight());
int increment = abs(intValueForLength(m_layer->renderer().style().marqueeIncrement(), clientSize));
int currentPos = (isHorizontal() ? m_layer->scrollXOffset() : m_layer->scrollYOffset());
newPos = currentPos + (addIncrement ? increment : -increment);
if (positive)
newPos = std::min(newPos, endPoint);
else
newPos = std::max(newPos, endPoint);
}
if (newPos == endPoint) {
m_currentLoop++;
if (m_totalLoops > 0 && m_currentLoop >= m_totalLoops)
m_timer.stop();
else if (style.marqueeBehavior() != MALTERNATE)
m_reset = true;
}
if (isHorizontal())
m_layer->scrollToXOffset(newPos);
else
m_layer->scrollToYOffset(newPos);
}
}