C++ LocalFrame::contentLayoutObject方法代码示例

void PaintLayerCompositor::updateIfNeededRecursive()
{
    FrameView* view = m_layoutView.frameView();
    if (view->shouldThrottleRendering())
        return;

    for (Frame* child = m_layoutView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
        if (!child->isLocalFrame())
            continue;
        LocalFrame* localFrame = toLocalFrame(child);
        // It's possible for trusted Pepper plugins to force hit testing in situations where
        // the frame tree is in an inconsistent state, such as in the middle of frame detach.
        // TODO(bbudge) Remove this check when trusted Pepper plugins are gone.
        if (localFrame->document()->isActive())
            localFrame->contentLayoutObject()->compositor()->updateIfNeededRecursive();
    }

    TRACE_EVENT0("blink", "PaintLayerCompositor::updateIfNeededRecursive");

    ASSERT(!m_layoutView.needsLayout());

    ScriptForbiddenScope forbidScript;

    // FIXME: enableCompositingModeIfNeeded can trigger a CompositingUpdateRebuildTree,
    // which asserts that it's not InCompositingUpdate.
    enableCompositingModeIfNeeded();

    if (m_needsUpdateDescendantDependentFlags) {
        updateDescendantDependentFlagsForEntireSubtree(*rootLayer());
        m_needsUpdateDescendantDependentFlags = false;
    }

    m_layoutView.commitPendingSelection();

    lifecycle().advanceTo(DocumentLifecycle::InCompositingUpdate);
    updateIfNeeded();
    lifecycle().advanceTo(DocumentLifecycle::CompositingClean);

    DocumentAnimations::updateCompositorAnimations(m_layoutView.document());

    m_layoutView.frameView()->scrollableArea()->updateCompositorScrollAnimations();
    if (const FrameView::ScrollableAreaSet* animatingScrollableAreas = m_layoutView.frameView()->animatingScrollableAreas()) {
        for (ScrollableArea* scrollableArea : *animatingScrollableAreas)
            scrollableArea->updateCompositorScrollAnimations();
    }

#if ENABLE(ASSERT)
    ASSERT(lifecycle().state() == DocumentLifecycle::CompositingClean);
    assertNoUnresolvedDirtyBits();
    for (Frame* child = m_layoutView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
        if (!child->isLocalFrame())
            continue;
        LocalFrame* localFrame = toLocalFrame(child);
        if (localFrame->shouldThrottleRendering())
            continue;
        localFrame->contentLayoutObject()->compositor()->assertNoUnresolvedDirtyBits();
    }
#endif
}

bool InspectorOverlay::handleMouseMove(const PlatformMouseEvent& event)
{
    if (!shouldSearchForNode())
        return false;

    LocalFrame* frame = m_webViewImpl->mainFrameImpl()->frame();
    if (!frame->view() || !frame->contentLayoutObject())
        return false;
    Node* node = hoveredNodeForEvent(frame, event, event.shiftKey());

    // Do not highlight within user agent shadow root unless requested.
    if (m_inspectMode != InspectorDOMAgent::SearchingForUAShadow) {
        ShadowRoot* shadowRoot = InspectorDOMAgent::userAgentShadowRoot(node);
        if (shadowRoot)
            node = shadowRoot->host();
    }

    // Shadow roots don't have boxes - use host element instead.
    if (node && node->isShadowRoot())
        node = node->parentOrShadowHostNode();

    if (!node)
        return true;

    Node* eventTarget = event.shiftKey() ? hoveredNodeForEvent(m_webViewImpl->mainFrameImpl()->frame(), event, false) : nullptr;
    if (eventTarget == node)
        eventTarget = nullptr;

    if (node && m_inspectModeHighlightConfig) {
        m_hoveredNodeForInspectMode = node;
        m_domAgent->nodeHighlightedInOverlay(node);
        highlightNode(node, eventTarget, *m_inspectModeHighlightConfig, event.ctrlKey() || event.metaKey());
    }
    return true;
}

static void frameContentAsPlainText(size_t maxChars, LocalFrame* frame, StringBuilder& output)
{
    Document* document = frame->document();
    if (!document)
        return;

    if (!frame->view())
        return;

    // Select the document body.
    if (document->body()) {
        const EphemeralRange range = EphemeralRange::rangeOfContents(*document->body());

        // The text iterator will walk nodes giving us text. This is similar to
        // the plainText() function in core/editing/TextIterator.h, but we implement the maximum
        // size and also copy the results directly into a wstring, avoiding the
        // string conversion.
        for (TextIterator it(range.startPosition(), range.endPosition()); !it.atEnd(); it.advance()) {
            it.text().appendTextToStringBuilder(output, 0, maxChars - output.length());
            if (output.length() >= maxChars)
                return; // Filled up the buffer.
        }
    }

    // The separator between frames when the frames are converted to plain text.
    const LChar frameSeparator[] = { '\n', '\n' };
    const size_t frameSeparatorLength = WTF_ARRAY_LENGTH(frameSeparator);

    // Recursively walk the children.
    const FrameTree& frameTree = frame->tree();
    for (Frame* curChild = frameTree.firstChild(); curChild; curChild = curChild->tree().nextSibling()) {
        if (!curChild->isLocalFrame())
            continue;
        LocalFrame* curLocalChild = toLocalFrame(curChild);
        // Ignore the text of non-visible frames.
        LayoutView* contentLayoutObject = curLocalChild->contentLayoutObject();
        LayoutPart* ownerLayoutObject = curLocalChild->ownerLayoutObject();
        if (!contentLayoutObject || !contentLayoutObject->size().width() || !contentLayoutObject->size().height()
            || (contentLayoutObject->location().x() + contentLayoutObject->size().width() <= 0) || (contentLayoutObject->location().y() + contentLayoutObject->size().height() <= 0)
            || (ownerLayoutObject && ownerLayoutObject->style() && ownerLayoutObject->style()->visibility() != VISIBLE)) {
            continue;
        }

        // Make sure the frame separator won't fill up the buffer, and give up if
        // it will. The danger is if the separator will make the buffer longer than
        // maxChars. This will cause the computation above:
        //   maxChars - output->size()
        // to be a negative number which will crash when the subframe is added.
        if (output.length() >= maxChars - frameSeparatorLength)
            return;

        output.append(frameSeparator, frameSeparatorLength);
        frameContentAsPlainText(maxChars, curLocalChild, output);
        if (output.length() >= maxChars)
            return; // Filled up the buffer.
    }
}