double VisualViewport::scrollTop() {
if (!mainFrame())
return 0;
updateStyleAndLayoutIgnorePendingStylesheets();
return adjustScrollForAbsoluteZoom(visibleRect().y(),
mainFrame()->pageZoomFactor());
}
double VisualViewport::clientHeight() {
if (!mainFrame())
return 0;
updateStyleAndLayoutIgnorePendingStylesheets();
float height = adjustScrollForAbsoluteZoom(visibleSize().height(),
mainFrame()->pageZoomFactor());
return height - mainFrame()->view()->horizontalScrollbarHeight() / m_scale;
}
double VisualViewport::clientWidth() {
if (!mainFrame())
return 0;
updateStyleAndLayoutIgnorePendingStylesheets();
float width = adjustScrollForAbsoluteZoom(visibleSize().width(),
mainFrame()->pageZoomFactor());
return width - mainFrame()->view()->verticalScrollbarWidth() / m_scale;
}
// Blink, Gecko and Presto's quirks mode implementations of overflow set to the
// body element differ from IE's: the formers can create a scrollable area for the
// body element that is not the same as the root elements's one. On IE's quirks mode
// though, as body is the root element, body's and the root element's scrollable areas,
// if any, are the same.
// In order words, a <body> will only have an overflow clip (that differs from
// documentElement's) if both html and body nodes have its overflow set to either hidden,
// auto or scroll.
// That said, Blink's {set}scroll{Top,Left} behaviors match Gecko's: even if there is a non-overflown
// scrollable area, scrolling should not get propagated to the viewport in neither strict
// or quirks modes.
double HTMLBodyElement::scrollLeft()
{
Document& document = this->document();
document.updateLayoutIgnorePendingStylesheets();
if (RuntimeEnabledFeatures::scrollTopLeftInteropEnabled()) {
RenderBox* render = renderBox();
if (!render)
return 0;
if (render->hasOverflowClip())
return adjustScrollForAbsoluteZoom(render->scrollLeft(), *render);
if (!document.inQuirksMode())
return 0;
}
if (FrameView* view = document.view())
return adjustScrollForAbsoluteZoom(view->scrollX(), document.frame()->pageZoomFactor());
return 0;
}
