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;
}
}
}
