IntRect RenderScrollbar::buttonRect(ScrollbarPart partType)
{
    RenderScrollbarPart* partRenderer = m_parts.get(partType);
    if (!partRenderer)
        return IntRect();
        
    partRenderer->layout();
    
    bool isHorizontal = orientation() == HorizontalScrollbar;
    if (partType == BackButtonStartPart)
        return IntRect(x(), y(), isHorizontal ? partRenderer->width() : width(), isHorizontal ? height() : partRenderer->height());
    if (partType == ForwardButtonEndPart)
        return IntRect(isHorizontal ? x() + width() - partRenderer->width() : x(),
        
                       isHorizontal ? y() : y() + height() - partRenderer->height(),
                       isHorizontal ? partRenderer->width() : width(),
                       isHorizontal ? height() : partRenderer->height());
    
    if (partType == ForwardButtonStartPart) {
        IntRect previousButton = buttonRect(BackButtonStartPart);
        return IntRect(isHorizontal ? x() + previousButton.width() : x(),
                       isHorizontal ? y() : y() + previousButton.height(),
                       isHorizontal ? partRenderer->width() : width(),
                       isHorizontal ? height() : partRenderer->height());
    }
    
    IntRect followingButton = buttonRect(ForwardButtonEndPart);
    return IntRect(isHorizontal ? x() + width() - followingButton.width() - partRenderer->width() : x(),
                   isHorizontal ? y() : y() + height() - followingButton.height() - partRenderer->height(),
                   isHorizontal ? partRenderer->width() : width(),
                   isHorizontal ? height() : partRenderer->height());
}
void RenderScrollbar::updateScrollbarParts(bool destroy)
{
    updateScrollbarPart(ScrollbarBGPart, destroy);
    updateScrollbarPart(BackButtonStartPart, destroy);
    updateScrollbarPart(ForwardButtonStartPart, destroy);
    updateScrollbarPart(BackTrackPart, destroy);
    updateScrollbarPart(ThumbPart, destroy);
    updateScrollbarPart(ForwardTrackPart, destroy);
    updateScrollbarPart(BackButtonEndPart, destroy);
    updateScrollbarPart(ForwardButtonEndPart, destroy);
    updateScrollbarPart(TrackBGPart, destroy);
    
    if (destroy)
        return;

    // See if the scrollbar's thickness changed.  If so, we need to mark our owning object as needing a layout.
    bool isHorizontal = orientation() == HorizontalScrollbar;    
    int oldThickness = isHorizontal ? height() : width();
    int newThickness = 0;
    RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart);
    if (part) {
        part->layout();
        newThickness = isHorizontal ? part->height() : part->width();
    }
    
    if (newThickness != oldThickness) {
        setFrameRect(IntRect(x(), y(), isHorizontal ? width() : newThickness, isHorizontal ? newThickness : height()));
        owningRenderer()->setChildNeedsLayout(true);
    }
}
int RenderScrollbar::minimumThumbLength()
{
    RenderScrollbarPart* partRenderer = m_parts.get(ThumbPart);
    if (!partRenderer)
        return 0;    
    partRenderer->layout();
    return orientation() == HorizontalScrollbar ? partRenderer->width() : partRenderer->height();
}
示例#4
0
RenderScrollbar::RenderScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, RenderBox* renderer, Frame* owningFrame)
    : Scrollbar(client, orientation, RegularScrollbar, RenderScrollbarTheme::renderScrollbarTheme())
    , m_owner(renderer)
    , m_owningFrame(owningFrame)
{
    // FIXME: We need to do this because RenderScrollbar::styleChanged is called as soon as the scrollbar is created.
    
    // Update the scrollbar size.
    updateScrollbarPart(ScrollbarBGPart);
    RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart);
    if (!part)
        return;

    part->layout();
    setFrameRect(IntRect(0, 0, part->width(), part->height()));
}