C++ RenderFlowThread类代码示例

void RenderRegion::ensureOverflowForBox(const RenderBox* box, RefPtr<RenderOverflow>& overflow, bool forceCreation)
{
    RenderFlowThread* flowThread = this->flowThread();
    ASSERT(flowThread);
    
    RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(box);
    if (!boxInfo && !forceCreation)
        return;

    if (boxInfo && boxInfo->overflow()) {
        overflow = boxInfo->overflow();
        return;
    }
    
    LayoutRect borderBox = box->borderBoxRectInRegion(this);
    LayoutRect clientBox;
    ASSERT(flowThread->objectShouldPaintInFlowRegion(box, this));

    if (!borderBox.isEmpty()) {
        borderBox = rectFlowPortionForBox(box, borderBox);
        
        clientBox = box->clientBoxRectInRegion(this);
        clientBox = rectFlowPortionForBox(box, clientBox);
        
        flowThread->flipForWritingModeLocalCoordinates(borderBox);
        flowThread->flipForWritingModeLocalCoordinates(clientBox);
    }

    if (boxInfo) {
        boxInfo->createOverflow(clientBox, borderBox);
        overflow = boxInfo->overflow();
    } else
        overflow = adoptRef(new RenderOverflow(clientBox, borderBox));
}

void RenderView::pushLayoutState(LayoutState& layoutState)
{
    if (m_flowThreadController) {
        RenderFlowThread* currentFlowThread = m_flowThreadController->currentRenderFlowThread();
        if (currentFlowThread)
            currentFlowThread->pushFlowThreadLayoutState(layoutState.renderer());
    }
    m_layoutState = &layoutState;
}

void RenderView::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
    RenderBlock::styleDidChange(diff, oldStyle);
    
    for (RenderObject* renderer = firstChild(); renderer; renderer = renderer->nextSibling()) {
        if (renderer->isRenderFlowThread()) {
            RenderFlowThread* flowRenderer = toRenderFlowThread(renderer);
            flowRenderer->setStyle(RenderFlowThread::createFlowThreadStyle(style()));
        }
    }
}

static inline bool inFlowThread(RenderObject* renderer, RenderNamedFlowThread* flowThread)
{
    if (!renderer)
        return false;
    RenderFlowThread* currentFlowThread = renderer->flowThreadContainingBlock();
    if (flowThread == currentFlowThread)
        return true;
    if (renderer->flowThreadState() != RenderObject::InsideInFlowThread)
        return false;
    
    // An in-flow flow thread can be nested inside an out-of-flow one, so we have to recur up to check.
    return inFlowThread(currentFlowThread->containingBlock(), flowThread);
}

void RenderView::popLayoutState()
{
    ASSERT(m_layoutState);
    m_layoutState = m_layoutState->next();
    if (!m_flowThreadController)
        return;

    RenderFlowThread* currentFlowThread = m_flowThreadController->currentRenderFlowThread();
    if (!currentFlowThread)
        return;

    currentFlowThread->popFlowThreadLayoutState();
}

RenderRegion* RootInlineBox::containingRegion() const
{
    ContainingRegionMap& regionMap = containingRegionMap(blockFlow());
    bool hasContainingRegion = regionMap.contains(this);
    RenderRegion* region = hasContainingRegion ? regionMap.get(this) : nullptr;

#ifndef NDEBUG
    if (hasContainingRegion) {
        RenderFlowThread* flowThread = blockFlow().flowThreadContainingBlock();
        const RenderRegionList& regionList = flowThread->renderRegionList();
        ASSERT_WITH_SECURITY_IMPLICATION(regionList.contains(region));
    }
#endif

    return region;
}

RenderMultiColumnSet::RenderMultiColumnSet(RenderFlowThread& flowThread, PassRef<RenderStyle> style)
    : RenderRegionSet(flowThread.document(), std::move(style), flowThread)
    , m_computedColumnCount(1)
    , m_computedColumnWidth(0)
    , m_computedColumnHeight(0)
    , m_maxColumnHeight(RenderFlowThread::maxLogicalHeight())
    , m_minSpaceShortage(RenderFlowThread::maxLogicalHeight())
    , m_minimumColumnHeight(0)
{
}

RenderFlowThread* RenderView::renderFlowThreadWithName(const AtomicString& flowThread)
{
    if (!m_renderFlowThreadList)
        m_renderFlowThreadList = adoptPtr(new RenderFlowThreadList());
    else {
        for (RenderFlowThreadList::iterator iter = m_renderFlowThreadList->begin(); iter != m_renderFlowThreadList->end(); ++iter) {
            RenderFlowThread* flowRenderer = *iter;
            if (flowRenderer->flowThread() == flowThread)
                return flowRenderer;
        }
    }

    RenderFlowThread* flowRenderer = new (renderArena()) RenderFlowThread(document(), flowThread);
    flowRenderer->setStyle(RenderFlowThread::createFlowThreadStyle(style()));
    addChild(flowRenderer);
    
    m_renderFlowThreadList->add(flowRenderer);
    setIsRenderFlowThreadOrderDirty(true);

    return flowRenderer;
}

void RenderRegion::computeOverflowFromFlowThread()
{
    ASSERT(isValid());
    
    LayoutRect layoutRect;
    {
        // When getting the overflow from the flow thread we need to temporarly reset the current flow thread because
        // we're changing flows.
        CurrentRenderFlowThreadMaintainer flowThreadMaintainer(m_flowThread);
        layoutRect = layoutOverflowRectForBox(m_flowThread);
    }

    layoutRect.setLocation(contentBoxRect().location() + (layoutRect.location() - m_flowThreadPortionRect.location()));

    // FIXME: Correctly adjust the layout overflow for writing modes.
    addLayoutOverflow(layoutRect);
    RenderFlowThread* enclosingRenderFlowThread = flowThreadContainingBlock();
    if (enclosingRenderFlowThread)
        enclosingRenderFlowThread->addRegionsLayoutOverflow(this, layoutRect);

    updateLayerTransform();
    updateScrollInfoAfterLayout();
}

void RenderView::layoutRenderFlowThreads()
{
    ASSERT(m_renderFlowThreadList);

    if (isRenderFlowThreadOrderDirty()) {
        // Arrange the thread list according to dependencies.
        RenderFlowThreadList sortedList;
        for (RenderFlowThreadList::iterator iter = m_renderFlowThreadList->begin(); iter != m_renderFlowThreadList->end(); ++iter) {
            RenderFlowThread* flowRenderer = *iter;
            if (sortedList.contains(flowRenderer))
                continue;
            flowRenderer->pushDependencies(sortedList);
            sortedList.add(flowRenderer);
        }
        m_renderFlowThreadList->swap(sortedList);
        setIsRenderFlowThreadOrderDirty(false);
    }

    for (RenderFlowThreadList::iterator iter = m_renderFlowThreadList->begin(); iter != m_renderFlowThreadList->end(); ++iter) {
        RenderFlowThread* flowRenderer = *iter;
        flowRenderer->layoutIfNeeded();
    }
}

static PassRefPtr<InspectorArray> buildObjectForRendererFragments(RenderObject* renderer, const HighlightConfig& config)
{
    RefPtr<InspectorArray> fragmentsArray = InspectorArray::create();

    RenderFlowThread* containingFlowThread = renderer->flowThreadContainingBlock();
    if (!containingFlowThread) {
        Highlight highlight;
        buildRendererHighlight(renderer, nullptr, config, &highlight, InspectorOverlay::CoordinateSystem::View);
        fragmentsArray->pushObject(buildObjectForHighlight(highlight));
    } else {
        RenderRegion* startRegion = nullptr;
        RenderRegion* endRegion = nullptr;
        if (!containingFlowThread->getRegionRangeForBox(&renderer->enclosingBox(), startRegion, endRegion)) {
            // The flow has no visible regions. The renderer is not visible on screen.
            return nullptr;
        }

        const RenderRegionList& regionList = containingFlowThread->renderRegionList();
        for (RenderRegionList::const_iterator iter = regionList.find(startRegion); iter != regionList.end(); ++iter) {
            RenderRegion* region = *iter;
            if (region->isValid()) {
                // Compute the highlight of the fragment inside the current region.
                Highlight highlight;
                buildRendererHighlight(renderer, region, config, &highlight, InspectorOverlay::CoordinateSystem::View);
                RefPtr<InspectorObject> fragmentObject = buildObjectForHighlight(highlight);

                // Compute the clipping area of the region.
                fragmentObject->setObject("region", buildObjectForCSSRegionContentClip(region));
                fragmentsArray->pushObject(fragmentObject.release());
            }
            if (region == endRegion)
                break;
        }
    }

    return fragmentsArray.release();
}

static PassRefPtr<InspectorObject> buildObjectForCSSRegionContentClip(RenderRegion* region)
{
    Frame* containingFrame = region->document().frame();
    if (!containingFrame)
        return nullptr;

    FrameView* containingView = containingFrame->view();
    FrameView* mainView = containingFrame->page()->mainFrame().view();
    RenderFlowThread* flowThread = region->flowThread();

    // Get the clip box of the current region and covert it into an absolute quad.
    LayoutRect flippedRegionRect(region->flowThreadPortionOverflowRect());
    flowThread->flipForWritingMode(flippedRegionRect);

    // Apply any border or padding of the region.
    flippedRegionRect.setLocation(region->contentBoxRect().location());
    
    FloatQuad clipQuad = region->localToAbsoluteQuad(FloatRect(flippedRegionRect));
    contentsQuadToPage(mainView, containingView, clipQuad);

    RefPtr<InspectorObject> regionObject = InspectorObject::create();
    regionObject->setArray("quad", buildArrayForQuad(clipQuad));
    return regionObject.release();
}

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();
}

static void buildRendererHighlight(RenderObject* renderer, RenderRegion* region, const HighlightConfig& highlightConfig, Highlight* highlight, InspectorOverlay::CoordinateSystem coordinateSystem)
{
    Frame* containingFrame = renderer->document().frame();
    if (!containingFrame)
        return;

    highlight->setDataFromConfig(highlightConfig);
    FrameView* containingView = containingFrame->view();
    FrameView* mainView = containingFrame->page()->mainFrame().view();

    // RenderSVGRoot should be highlighted through the isBox() code path, all other SVG elements should just dump their absoluteQuads().
    bool isSVGRenderer = renderer->node() && renderer->node()->isSVGElement() && !renderer->isSVGRoot();

    if (isSVGRenderer) {
        highlight->type = HighlightTypeRects;
        renderer->absoluteQuads(highlight->quads);
        for (size_t i = 0; i < highlight->quads.size(); ++i)
            contentsQuadToCoordinateSystem(mainView, containingView, highlight->quads[i], coordinateSystem);
    } else if (renderer->isBox() || renderer->isRenderInline()) {
        LayoutRect contentBox;
        LayoutRect paddingBox;
        LayoutRect borderBox;
        LayoutRect marginBox;

        if (renderer->isBox()) {
            RenderBox* renderBox = toRenderBox(renderer);

            LayoutBoxExtent margins(renderBox->marginTop(), renderBox->marginRight(), renderBox->marginBottom(), renderBox->marginLeft());

            if (!renderBox->isOutOfFlowPositioned() && region) {
                RenderBox::LogicalExtentComputedValues computedValues;
                renderBox->computeLogicalWidthInRegion(computedValues, region);
                margins.mutableLogicalLeft(renderBox->style().writingMode()) = computedValues.m_margins.m_start;
                margins.mutableLogicalRight(renderBox->style().writingMode()) = computedValues.m_margins.m_end;
            }

            paddingBox = renderBox->clientBoxRectInRegion(region);
            contentBox = LayoutRect(paddingBox.x() + renderBox->paddingLeft(), paddingBox.y() + renderBox->paddingTop(),
                paddingBox.width() - renderBox->paddingLeft() - renderBox->paddingRight(), paddingBox.height() - renderBox->paddingTop() - renderBox->paddingBottom());
            borderBox = LayoutRect(paddingBox.x() - renderBox->borderLeft(), paddingBox.y() - renderBox->borderTop(),
                paddingBox.width() + renderBox->borderLeft() + renderBox->borderRight(), paddingBox.height() + renderBox->borderTop() + renderBox->borderBottom());
            marginBox = LayoutRect(borderBox.x() - margins.left(), borderBox.y() - margins.top(),
                borderBox.width() + margins.left() + margins.right(), borderBox.height() + margins.top() + margins.bottom());
        } else {
            RenderInline* renderInline = toRenderInline(renderer);

            // RenderInline's bounding box includes paddings and borders, excludes margins.
            borderBox = renderInline->linesBoundingBox();
            paddingBox = LayoutRect(borderBox.x() + renderInline->borderLeft(), borderBox.y() + renderInline->borderTop(),
                borderBox.width() - renderInline->borderLeft() - renderInline->borderRight(), borderBox.height() - renderInline->borderTop() - renderInline->borderBottom());
            contentBox = LayoutRect(paddingBox.x() + renderInline->paddingLeft(), paddingBox.y() + renderInline->paddingTop(),
                paddingBox.width() - renderInline->paddingLeft() - renderInline->paddingRight(), paddingBox.height() - renderInline->paddingTop() - renderInline->paddingBottom());
            // Ignore marginTop and marginBottom for inlines.
            marginBox = LayoutRect(borderBox.x() - renderInline->marginLeft(), borderBox.y(),
                borderBox.width() + renderInline->horizontalMarginExtent(), borderBox.height());
        }

        FloatQuad absContentQuad;
        FloatQuad absPaddingQuad;
        FloatQuad absBorderQuad;
        FloatQuad absMarginQuad;

        if (region) {
            RenderFlowThread* flowThread = region->flowThread();

            // Figure out the quads in the space of the RenderFlowThread.
            absContentQuad = renderer->localToContainerQuad(FloatRect(contentBox), flowThread);
            absPaddingQuad = renderer->localToContainerQuad(FloatRect(paddingBox), flowThread);
            absBorderQuad = renderer->localToContainerQuad(FloatRect(borderBox), flowThread);
            absMarginQuad = renderer->localToContainerQuad(FloatRect(marginBox), flowThread);

            // Move the quad relative to the space of the current region.
            LayoutRect flippedRegionRect(region->flowThreadPortionRect());
            flowThread->flipForWritingMode(flippedRegionRect);

            FloatSize delta = region->contentBoxRect().location() - flippedRegionRect.location();
            absContentQuad.move(delta);
            absPaddingQuad.move(delta);
            absBorderQuad.move(delta);
            absMarginQuad.move(delta);

            // Resolve the absolute quads starting from the current region.
            absContentQuad = region->localToAbsoluteQuad(absContentQuad);
            absPaddingQuad = region->localToAbsoluteQuad(absPaddingQuad);
            absBorderQuad = region->localToAbsoluteQuad(absBorderQuad);
            absMarginQuad = region->localToAbsoluteQuad(absMarginQuad);
        } else {
            absContentQuad = renderer->localToAbsoluteQuad(FloatRect(contentBox));
            absPaddingQuad = renderer->localToAbsoluteQuad(FloatRect(paddingBox));
            absBorderQuad = renderer->localToAbsoluteQuad(FloatRect(borderBox));
            absMarginQuad = renderer->localToAbsoluteQuad(FloatRect(marginBox));
        }

        contentsQuadToCoordinateSystem(mainView, containingView, absContentQuad, coordinateSystem);
        contentsQuadToCoordinateSystem(mainView, containingView, absPaddingQuad, coordinateSystem);
        contentsQuadToCoordinateSystem(mainView, containingView, absBorderQuad, coordinateSystem);
        contentsQuadToCoordinateSystem(mainView, containingView, absMarginQuad, coordinateSystem);

        highlight->type = HighlightTypeNode;
        highlight->quads.append(absMarginQuad);
//.........这里部分代码省略.........