C++ RenderBoxModelObject::offsetWidth方法代码示例

void RenderMathMLRoot::layout()
{
    RenderBlock::layout();

    if (!firstChild() || !lastChild())
        return;

    int maxHeight = toRenderBoxModelObject(lastChild())->offsetHeight();
    
    RenderObject* current = lastChild()->firstChild();
    if (current)
        current->style()->setVerticalAlign(BASELINE);
    
    if (!maxHeight)
        maxHeight = style()->fontSize();
    
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeight * style()->fontSize());
    int topStartShift = 0;
    
    if (maxHeight > thresholdHeight && thresholdHeight) {
        float shift = (maxHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        int frontWidth = static_cast<int>(style()->fontSize() * gRadicalWidth);
        topStartShift = static_cast<int>(gRadicalBottomPointXPos * frontWidth * shift);
        
        style()->setPaddingBottom(Length(static_cast<int>(gRootBottomPadding * style()->fontSize()), Fixed));
    }
    
    // Positioning of the index
    RenderObject* possibleIndex = firstChild()->firstChild();
    while (possibleIndex && !possibleIndex->isBoxModelObject())
        possibleIndex = possibleIndex->nextSibling();
    RenderBoxModelObject* indexBox = toRenderBoxModelObject(possibleIndex);
    if (!indexBox)
        return;
    
    int indexShift = indexBox->offsetWidth() + topStartShift;
    int radicalHeight = static_cast<int>((1 - gRadicalTopLeftPointYPos) * maxHeight);
    int rootMarginTop = radicalHeight + style()->paddingBottom().value() + indexBox->offsetHeight() - (maxHeight + static_cast<int>(gRootPadding * style()->fontSize()));
    
    style()->setPaddingLeft(Length(indexShift, Fixed));
    if (rootMarginTop > 0)
        style()->setPaddingTop(Length(rootMarginTop + static_cast<int>(gRootPadding * style()->fontSize()), Fixed));
    
    setNeedsLayout(true);
    setPreferredLogicalWidthsDirty(true, false);
    RenderBlock::layout();

    indexBox->style()->setBottom(Length(radicalHeight + style()->paddingBottom().value(), Fixed));

    // Now that we've potentially changed its position, we need layout the index again.
    indexBox->setNeedsLayout(true);
    indexBox->layout();
}

void RenderMathMLFenced::layout() 
{
    RenderMathMLRow::layout();
    
    int width = 0;
    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
        if (current->isBoxModelObject()) {
            RenderBoxModelObject* box = toRenderBoxModelObject(current);
            width += box->offsetWidth();
        }
    }
    width++;
    style()->setWidth(Length(width, Fixed));

    setNeedsLayoutAndPrefWidthsRecalc();
    markContainingBlocksForLayout();
    RenderBlock::layout();
}

void RenderMathMLRoot::paint(PaintInfo& info, int tx, int ty)
{
    RenderMathMLBlock::paint(info , tx , ty);
    
    if (info.context->paintingDisabled())
        return;

    if (!firstChild() || !lastChild())
        return;

    tx += x();
    ty += y();
    
    RenderBoxModelObject* indexBox = toRenderBoxModelObject(lastChild());
    
    int maxHeight = indexBox->offsetHeight();
    // default to the font size in pixels if we're empty
    if (!maxHeight)
        maxHeight = style()->fontSize();
    int width = indexBox->offsetWidth();
    
    int indexWidth = 0;
    RenderObject* current = firstChild();
    while (current != lastChild()) {
        if (current->isBoxModelObject()) {
            RenderBoxModelObject* box = toRenderBoxModelObject(current);
            indexWidth += box->offsetWidth();
        }
        current = current->nextSibling();
    }
    
    int frontWidth = static_cast<int>(style()->fontSize() * gRadicalWidth);
    int topStartShift = 0;
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeight * style()->fontSize());
    
    if (maxHeight > thresholdHeight && thresholdHeight) {
        float shift = (maxHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        topStartShift = static_cast<int>(gRadicalBottomPointXPos * frontWidth * shift);
    }
    
    width += topStartShift;
    
    int rootPad = static_cast<int>(gRootPadding * style()->fontSize());
    int start = tx + indexWidth + gRadicalLeftMargin + style()->paddingLeft().value() - rootPad;
    ty += style()->paddingTop().value() - rootPad;
    
    FloatPoint topStart(start - topStartShift, ty);
    FloatPoint bottomLeft(start - gRadicalBottomPointXPos * frontWidth , ty + maxHeight + gRadicalBasePad);
    FloatPoint topLeft(start - gRadicalTopLeftPointXPos * frontWidth , ty + gRadicalTopLeftPointYPos * maxHeight);
    FloatPoint leftEnd(start - frontWidth , topLeft.y() + gRadicalLeftEndYShift * style()->fontSize());
    
    info.context->save();
    
    info.context->setStrokeThickness(gRadicalLineThickness * style()->fontSize());
    info.context->setStrokeStyle(SolidStroke);
    info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), ColorSpaceDeviceRGB);
    info.context->setLineJoin(MiterJoin);
    info.context->setMiterLimit(style()->fontSize());
    
    Path root;
    
    root.moveTo(FloatPoint(topStart.x() + width, ty));
    // draw top
    root.addLineTo(topStart);
    // draw from top left corner to bottom point of radical
    root.addLineTo(bottomLeft);
    // draw from bottom point to top of left part of radical base "pocket"
    root.addLineTo(topLeft);
    // draw to end
    root.addLineTo(leftEnd);
    
    info.context->strokePath(root);
    
    info.context->save();
    
    // Build a mask to draw the thick part of the root.
    Path mask;
    
    mask.moveTo(topStart);
    mask.addLineTo(bottomLeft);
    mask.addLineTo(topLeft);
    mask.addLineTo(FloatPoint(2 * topLeft.x() - leftEnd.x(), 2 * topLeft.y() - leftEnd.y()));
    
    info.context->clip(mask);
    
    // Draw the thick part of the root.
    info.context->setStrokeThickness(gRadicalThickLineThickness * style()->fontSize());
    info.context->setLineCap(SquareCap);
    
    Path line;
    line.moveTo(bottomLeft);
    line.addLineTo(topLeft);

    info.context->strokePath(line);
    
    info.context->restore();
    
//.........这里部分代码省略.........