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

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

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

    int baseHeight = toRenderBoxModelObject(lastChild())->pixelSnappedOffsetHeight();
    if (!baseHeight)
        baseHeight = style()->fontSize();
    
    RenderObject* base = lastChild()->firstChild();
    if (base)
        base->style()->setVerticalAlign(BASELINE); // FIXME: Can this style be modified?
    
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeightEms * style()->fontSize());
    int overbarLeftPointShift = 0;
    
    // FIXME: Can style() and indexBox->style() be modified (4 times below)?
    if (baseHeight > thresholdHeight && thresholdHeight) {
        float shift = (baseHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        int frontWidth = static_cast<int>(style()->fontSize() * gFrontWidthEms);
        overbarLeftPointShift = static_cast<int>(gRadicalBottomPointXFront * frontWidth * shift);
        
        style()->setPaddingBottom(Length(static_cast<int>(gBigRootBottomPaddingEms * 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 shiftForIndex = indexBox->pixelSnappedOffsetWidth() + overbarLeftPointShift;
    int partDipHeight = static_cast<int>((1 - gRadicalDipLeftPointYPos) * baseHeight);
    int rootExtraTop = partDipHeight + style()->paddingBottom().value() + indexBox->pixelSnappedOffsetHeight()
        - (baseHeight + static_cast<int>(gRootPaddingEms * style()->fontSize()));
    
    style()->setPaddingLeft(Length(shiftForIndex, Fixed));
    if (rootExtraTop > 0)
        style()->setPaddingTop(Length(rootExtraTop + static_cast<int>(gRootPaddingEms * style()->fontSize()), Fixed));
    
    setNeedsLayout(true);
    setPreferredLogicalWidthsDirty(true, MarkOnlyThis); // FIXME: Can this really be right?
    RenderBlock::layout();

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

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

static PassRefPtr<InspectorObject> buildObjectForElementInfo(Node* node)
{
    if (!node->isElementNode() || !node->document().frame())
        return nullptr;

    RefPtr<InspectorObject> elementInfo = InspectorObject::create();

    Element* element = toElement(node);
    bool isXHTML = element->document().isXHTMLDocument();
    elementInfo->setString("tagName", isXHTML ? element->nodeName() : element->nodeName().lower());
    elementInfo->setString("idValue", element->getIdAttribute());
    HashSet<AtomicString> usedClassNames;
    if (element->hasClass() && element->isStyledElement()) {
        StringBuilder classNames;
        const SpaceSplitString& classNamesString = toStyledElement(element)->classNames();
        size_t classNameCount = classNamesString.size();
        for (size_t i = 0; i < classNameCount; ++i) {
            const AtomicString& className = classNamesString[i];
            if (usedClassNames.contains(className))
                continue;
            usedClassNames.add(className);
            classNames.append('.');
            classNames.append(className);
        }
        elementInfo->setString("className", classNames.toString());
    }

    RenderElement* renderer = element->renderer();
    Frame* containingFrame = node->document().frame();
    FrameView* containingView = containingFrame->view();
    IntRect boundingBox = pixelSnappedIntRect(containingView->contentsToRootView(renderer->absoluteBoundingBoxRect()));
    RenderBoxModelObject* modelObject = renderer->isBoxModelObject() ? toRenderBoxModelObject(renderer) : nullptr;
    elementInfo->setString("nodeWidth", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetWidth(), *modelObject) : boundingBox.width()));
    elementInfo->setString("nodeHeight", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetHeight(), *modelObject) : boundingBox.height()));
    
    if (renderer->isRenderNamedFlowFragmentContainer()) {
        RenderNamedFlowFragment* region = toRenderBlockFlow(renderer)->renderNamedFlowFragment();
        if (region->isValid()) {
            RenderFlowThread* flowThread = region->flowThread();
            ASSERT(flowThread && flowThread->isRenderNamedFlowThread());
            RefPtr<InspectorObject> regionFlowInfo = InspectorObject::create();
            regionFlowInfo->setString("name", toRenderNamedFlowThread(flowThread)->flowThreadName());
            regionFlowInfo->setArray("regions", buildObjectForCSSRegionsHighlight(region, flowThread));
            elementInfo->setObject("regionFlowInfo", regionFlowInfo.release());
        }
    }

    RenderFlowThread* containingFlowThread = renderer->flowThreadContainingBlock();
    if (containingFlowThread && containingFlowThread->isRenderNamedFlowThread()) {
        RefPtr<InspectorObject> contentFlowInfo = InspectorObject::create();
        contentFlowInfo->setString("name", toRenderNamedFlowThread(containingFlowThread)->flowThreadName());
        elementInfo->setObject("contentFlowInfo", contentFlowInfo.release());
    }

#if ENABLE(CSS_SHAPES)
    if (renderer->isBox()) {
        RenderBox* renderBox = toRenderBox(renderer);
        if (RefPtr<InspectorObject> shapeObject = buildObjectForShapeOutside(containingFrame, renderBox))
            elementInfo->setObject("shapeOutsideInfo", shapeObject.release());
    }
#endif

    // Need to enable AX to get the computed role.
    if (!WebCore::AXObjectCache::accessibilityEnabled())
        WebCore::AXObjectCache::enableAccessibility();

    if (AXObjectCache* axObjectCache = node->document().axObjectCache()) {
        if (AccessibilityObject* axObject = axObjectCache->getOrCreate(node))
            elementInfo->setString("role", axObject->computedRoleString());
    }

    return elementInfo.release();
}

void InspectorOverlay::drawNodeHighlight()
{
    if (!m_highlightNode)
        return;

    Highlight highlight;
    buildNodeHighlight(m_highlightNode.get(), m_nodeHighlightConfig, &highlight);
    RefPtr<InspectorObject> highlightObject = buildObjectForHighlight(m_page->mainFrame()->view(), highlight);

    Node* node = m_highlightNode.get();
    if (node->isElementNode() && m_nodeHighlightConfig.showInfo && node->renderer() && node->document()->frame()) {
        RefPtr<InspectorObject> elementInfo = InspectorObject::create();
        Element* element = toElement(node);
        bool isXHTML = element->document()->isXHTMLDocument();
        elementInfo->setString("tagName", isXHTML ? element->nodeName() : element->nodeName().lower());
        elementInfo->setString("idValue", element->getIdAttribute());
        HashSet<AtomicString> usedClassNames;
        if (element->hasClass() && element->isStyledElement()) {
            StringBuilder classNames;
            const SpaceSplitString& classNamesString = static_cast<StyledElement*>(element)->classNames();
            size_t classNameCount = classNamesString.size();
            for (size_t i = 0; i < classNameCount; ++i) {
                const AtomicString& className = classNamesString[i];
                if (usedClassNames.contains(className))
                    continue;
                usedClassNames.add(className);
                classNames.append('.');
                classNames.append(className);
            }
            elementInfo->setString("className", classNames.toString());
        }

        RenderObject* renderer = node->renderer();
        Frame* containingFrame = node->document()->frame();
        FrameView* containingView = containingFrame->view();
        IntRect boundingBox = pixelSnappedIntRect(containingView->contentsToRootView(renderer->absoluteBoundingBoxRect()));
        RenderBoxModelObject* modelObject = renderer->isBoxModelObject() ? toRenderBoxModelObject(renderer) : 0;
        elementInfo->setString("nodeWidth", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetWidth(), modelObject) : boundingBox.width()));
        elementInfo->setString("nodeHeight", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetHeight(), modelObject) : boundingBox.height()));
        highlightObject->setObject("elementInfo", elementInfo.release());
    }
    evaluateInOverlay("drawNodeHighlight", highlightObject);
}

void RenderMathMLSquareRoot::paint(PaintInfo& info, const LayoutPoint& paintOffset)
{
    RenderMathMLBlock::paint(info, paintOffset);
   
    if (info.context->paintingDisabled())
        return;
    
    IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset + location());

    int maxHeight = 0;
    int width = 0;
    RenderObject* current = firstChild();
    while (current) {
        if (current->isBoxModelObject()) {
            
            RenderBoxModelObject* box = toRenderBoxModelObject(current);
            
            // Check to see if this box has a larger height
            if (box->pixelSnappedOffsetHeight() > maxHeight)
                maxHeight = box->pixelSnappedOffsetHeight();
            width += box->pixelSnappedOffsetWidth();
        }
        current = current->nextSibling();
    }
    // default to the font size in pixels if we're empty
    if (!maxHeight)
        maxHeight = style()->fontSize();
    
    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;
    
    FloatPoint topStart(adjustedPaintOffset.x() + frontWidth - topStartShift, adjustedPaintOffset.y());
    FloatPoint bottomLeft(adjustedPaintOffset.x() + frontWidth * gRadicalBottomPointXPos , adjustedPaintOffset.y() + maxHeight + gRadicalBasePad);
    FloatPoint topLeft(adjustedPaintOffset.x() + frontWidth * gRadicalTopLeftPointXPos , adjustedPaintOffset.y() + gRadicalTopLeftPointYPos * maxHeight);
    FloatPoint leftEnd(adjustedPaintOffset.x() , topLeft.y() + gRadicalLeftEndYShift * style()->fontSize());
    
    GraphicsContextStateSaver stateSaver(*info.context);
    
    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 , adjustedPaintOffset.y()));
    // 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);
    
    GraphicsContextStateSaver maskStateSaver(*info.context);
    
    // 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);
}

void RenderMathMLRoot::paint(PaintInfo& info, const LayoutPoint& paintOffset)
{
    RenderMathMLBlock::paint(info, paintOffset);
    
    if (info.context->paintingDisabled())
        return;
    
    if (!firstChild() || !lastChild())
        return;
    
    IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset + location());
    
    RenderBoxModelObject* baseWrapper = toRenderBoxModelObject(lastChild());
    
    int baseHeight = baseWrapper->pixelSnappedOffsetHeight();
    // default to the font size in pixels if we're empty
    if (!baseHeight)
        baseHeight = style()->fontSize();
    int overbarWidth = baseWrapper->pixelSnappedOffsetWidth();
    
    int indexWidth = 0;
    RenderObject* current = firstChild();
    while (current != lastChild()) {
        if (current->isBoxModelObject()) {
            RenderBoxModelObject* box = toRenderBoxModelObject(current);
            indexWidth += box->pixelSnappedOffsetWidth();
        }
        current = current->nextSibling();
    }
    
    int frontWidth = static_cast<int>(style()->fontSize() * gFrontWidthEms);
    int overbarLeftPointShift = 0;
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeightEms * style()->fontSize());
    
    if (baseHeight > thresholdHeight && thresholdHeight) {
        float shift = (baseHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        overbarLeftPointShift = static_cast<int>(gRadicalBottomPointXFront * frontWidth * shift);
    }
    
    overbarWidth += overbarLeftPointShift;
    
    int rootPad = static_cast<int>(gRootPaddingEms * style()->fontSize());
    int startX = adjustedPaintOffset.x() + indexWidth + gRadicalLeftExtra + style()->paddingLeft().value() - rootPad;
    adjustedPaintOffset.setY(adjustedPaintOffset.y() + style()->paddingTop().value() - rootPad);
    
    FloatPoint overbarLeftPoint(startX - overbarLeftPointShift, adjustedPaintOffset.y());
    FloatPoint bottomPoint(startX - gRadicalBottomPointXFront * frontWidth, adjustedPaintOffset.y() + baseHeight + gRadicalBottomPointLower);
    FloatPoint dipLeftPoint(startX - gRadicalDipLeftPointXFront * frontWidth, adjustedPaintOffset.y() + gRadicalDipLeftPointYPos * baseHeight);
    FloatPoint leftEnd(startX - frontWidth, dipLeftPoint.y() + gRadicalLeftEndYShiftEms * style()->fontSize());
    
    GraphicsContextStateSaver stateSaver(*info.context);
    
    info.context->setStrokeThickness(gRadicalLineThicknessEms * 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(overbarLeftPoint.x() + overbarWidth, adjustedPaintOffset.y()));
    // draw top
    root.addLineTo(overbarLeftPoint);
    // draw from top left corner to bottom point of radical
    root.addLineTo(bottomPoint);
    // draw from bottom point to top of left part of radical base "dip"
    root.addLineTo(dipLeftPoint);
    // draw to end
    root.addLineTo(leftEnd);
    
    info.context->strokePath(root);
    
    GraphicsContextStateSaver maskStateSaver(*info.context);
    
    // Build a mask to draw the thick part of the root.
    Path mask;
    
    mask.moveTo(overbarLeftPoint);
    mask.addLineTo(bottomPoint);
    mask.addLineTo(dipLeftPoint);
    mask.addLineTo(FloatPoint(2 * dipLeftPoint.x() - leftEnd.x(), 2 * dipLeftPoint.y() - leftEnd.y()));
    
    info.context->clip(mask);
    
    // Draw the thick part of the root.
    info.context->setStrokeThickness(gRadicalThickLineThicknessEms * style()->fontSize());
    info.context->setLineCap(SquareCap);
    
    Path line;
    line.moveTo(bottomPoint);
    line.addLineTo(dipLeftPoint);
    
    info.context->strokePath(line);
}