C++ HitTestLocation类代码示例

bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
{
    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return false;

    LayoutPoint point = locationInContainer.point();
    LayoutRect rect = firstLineBox()->isHorizontal() ?
        IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
        IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1);

    if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
        return false;

    // See if our root lines contain the point.  If so, then we hit test
    // them further.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
        const RootInlineBox& rootBox = curr->root();
        if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(rootBox.lineTop()), curr->logicalBottomVisualOverflow(rootBox.lineBottom()), rect, accumulatedOffset)) {
            bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, rootBox.lineTop(), rootBox.lineBottom(), hitTestAction);
            if (inside) {
                renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                return true;
            }
        }
    }

    return false;
}

bool LayoutSVGRoot::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
    LayoutPoint pointInParent = locationInContainer.point() - toLayoutSize(accumulatedOffset);
    LayoutPoint pointInBorderBox = pointInParent - toLayoutSize(location());

    // Only test SVG content if the point is in our content box, or in case we
    // don't clip to the viewport, the visual overflow rect.
    // FIXME: This should be an intersection when rect-based hit tests are supported by nodeAtFloatPoint.
    if (contentBoxRect().contains(pointInBorderBox) || (!shouldApplyViewportClip() && visualOverflowRect().contains(pointInBorderBox))) {
        const AffineTransform& localToParentTransform = this->localToParentTransform();
        if (localToParentTransform.isInvertible()) {
            FloatPoint localPoint = localToParentTransform.inverse().mapPoint(FloatPoint(pointInParent));

            for (LayoutObject* child = lastChild(); child; child = child->previousSibling()) {
                // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
                if (child->nodeAtFloatPoint(result, localPoint, hitTestAction)) {
                    updateHitTestResult(result, pointInBorderBox);
                    if (result.addNodeToListBasedTestResult(child->node(), locationInContainer) == StopHitTesting)
                        return true;
                }
            }
        }
    }

    // If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
    if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) && visibleToHitTestRequest(result.hitTestRequest())) {
        // Only return true here, if the last hit testing phase 'BlockBackground' (or 'ChildBlockBackground' - depending on context) is executed.
        // If we'd return true in the 'Foreground' phase, hit testing would stop immediately. For SVG only trees this doesn't matter.
        // Though when we have a <foreignObject> subtree we need to be able to detect hits on the background of a <div> element.
        // If we'd return true here in the 'Foreground' phase, we are not able to detect these hits anymore.
        LayoutRect boundsRect(accumulatedOffset + location(), size());
        if (locationInContainer.intersects(boundsRect)) {
            updateHitTestResult(result, pointInBorderBox);
            if (result.addNodeToListBasedTestResult(node(), locationInContainer, boundsRect) == StopHitTesting)
                return true;
        }
    }

    return false;
}

bool SVGInlineTextBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit, LayoutUnit)
{
    // FIXME: integrate with InlineTextBox::nodeAtPoint better.
    ASSERT(!isLineBreak());

    PointerEventsHitRules hitRules(PointerEventsHitRules::SVG_TEXT_HITTESTING, request, renderer().style()->pointerEvents());
    bool isVisible = renderer().style()->visibility() == VISIBLE;
    if (isVisible || !hitRules.requireVisible) {
        if ((hitRules.canHitStroke && (renderer().style()->svgStyle()->hasStroke() || !hitRules.requireStroke))
            || (hitRules.canHitFill && (renderer().style()->svgStyle()->hasFill() || !hitRules.requireFill))) {
            FloatPoint boxOrigin(x(), y());
            boxOrigin.moveBy(accumulatedOffset);
            FloatRect rect(boxOrigin, size());
            if (locationInContainer.intersects(rect)) {
                renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                if (!result.addNodeToRectBasedTestResult(&renderer().textNode(), request, locationInContainer, rect))
                    return true;
             }
        }
    }
    return false;
}

bool RenderView::hitTest(const HitTestRequest& request, const HitTestLocation& location, HitTestResult& result)
{
    TRACE_EVENT0("blink", "RenderView::hitTest");
    m_hitTestCount++;

    if (!m_frameView->visibleContentRect().contains(location.roundedPoint()))
        return false;

    // We have to recursively update layout/style here because otherwise, when the hit test recurses
    // into a child document, it could trigger a layout on the parent document, which can destroy RenderLayers
    // that are higher up in the call stack, leading to crashes.
    // Note that Document::updateLayout calls its parent's updateLayout.
    // FIXME: It should be the caller's responsibility to ensure an up-to-date layout.
    frameView()->updateLayoutAndStyleIfNeededRecursive();

    // RenderView should make sure to update layout before entering hit testing
    ASSERT(!frame()->view()->layoutPending());
    ASSERT(!document().renderView()->needsLayout());

    // TODO(ojan): Does any of this intersection stuff make sense for Sky?
    LayoutRect hitTestArea = view()->documentRect();
    if (!request.ignoreClipping())
        hitTestArea.intersect(frame()->view()->visibleContentRect());

    bool insideLayer = hitTestLayer(layer(), 0, request, result, hitTestArea, location);
    if (!insideLayer) {
        // TODO(ojan): Is this code needed for Sky?

        // We didn't hit any layer. If we are the root layer and the mouse is -- or just was -- down,
        // return ourselves. We do this so mouse events continue getting delivered after a drag has
        // exited the WebView, and so hit testing over a scrollbar hits the content document.
        if (request.active() || request.release()) {
            updateHitTestResult(result, location.point());
            insideLayer = true;
        }
    }
    return insideLayer;
}

bool SVGInlineTextBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit, LayoutUnit, HitTestAction)
{
    // FIXME: integrate with InlineTextBox::nodeAtPoint better.
    ASSERT(!isLineBreak());

    PointerEventsHitRules hitRules(PointerEventsHitRules::SVG_TEXT_HITTESTING, request, renderer().style().pointerEvents());
    bool isVisible = renderer().style().visibility() == VISIBLE;
    if (isVisible || !hitRules.requireVisible) {
        if ((hitRules.canHitStroke && (renderer().style().svgStyle().hasStroke() || !hitRules.requireStroke))
            || (hitRules.canHitFill && (renderer().style().svgStyle().hasFill() || !hitRules.requireFill))) {
            FloatPoint boxOrigin(x(), y());
            boxOrigin.moveBy(accumulatedOffset);
            FloatRect rect(boxOrigin, size());
            if (locationInContainer.intersects(rect)) {

                float scalingFactor = renderer().scalingFactor();
                ASSERT(scalingFactor);
                
                float baseline = renderer().scaledFont().fontMetrics().floatAscent() / scalingFactor;

                AffineTransform fragmentTransform;
                for (auto& fragment : m_textFragments) {
                    FloatQuad fragmentQuad(FloatRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height));
                    fragment.buildFragmentTransform(fragmentTransform);
                    if (!fragmentTransform.isIdentity())
                        fragmentQuad = fragmentTransform.mapQuad(fragmentQuad);
                    
                    if (fragmentQuad.containsPoint(locationInContainer.point())) {
                        renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                        if (!result.addNodeToRectBasedTestResult(&renderer().textNode(), request, locationInContainer, rect))
                            return true;
                    }
                }
             }
        }
    }
    return false;
}

// Hit Testing
bool RenderRegion::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
    if (!isValid())
        return false;

    LayoutPoint adjustedLocation = accumulatedOffset + location();

    // Check our bounds next. For this purpose always assume that we can only be hit in the
    // foreground phase (which is true for replaced elements like images).
    // FIXME: Once we support overflow, we need to intersect with that and not with the bounds rect.
    LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
    boundsRect.moveBy(adjustedLocation);
    if (visibleToHitTestRequest(request) && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
        // Check the contents of the RenderFlowThread.
        if (m_flowThread->hitTestFlowThreadPortionInRegion(this, flowThreadPortionRect(), flowThreadPortionOverflowRect(), request, result, locationInContainer, LayoutPoint(adjustedLocation.x() + borderLeft() + paddingLeft(), adjustedLocation.y() + borderTop() + paddingTop())))
            return true;
        updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
        if (!result.addNodeToRectBasedTestResult(generatingNode(), request, locationInContainer, boundsRect))
            return true;
    }

    return false;
}

bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom, HitTestAction hitTestAction)
{
    LayoutPoint adjustedLocation = accumulatedOffset + LayoutPoint(topLeft());

    // Hit test the markup box.
    if (InlineBox* markupBox = this->markupBox()) {
        const RenderStyle& lineStyle = this->lineStyle();
        LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
        LayoutUnit mty = adjustedLocation.y() + lineStyle.fontMetrics().ascent() - (markupBox->y() + markupBox->lineStyle().fontMetrics().ascent());
        if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom, hitTestAction)) {
            blockFlow().updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
            return true;
        }
    }

    LayoutRect boundsRect(adjustedLocation, LayoutSize(m_logicalWidth, m_height));
    if (visibleToHitTesting() && boundsRect.intersects(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0))) {
        blockFlow().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
        if (!result.addNodeToRectBasedTestResult(blockFlow().element(), request, locationInContainer, boundsRect))
            return true;
    }

    return false;
}

bool HitTestResult::addNodeToRectBasedTestResult(Node* node, const HitTestRequest& request, const HitTestLocation& locationInContainer, const FloatRect& rect)
{
    // If it is not a rect-based hit test, this method has to be no-op.
    // Return false, so the hit test stops.
    if (!isRectBasedTest())
        return false;

    // If node is null, return true so the hit test can continue.
    if (!node)
        return true;

    mutableRectBasedTestResult().add(node);

    bool regionFilled = rect.contains(locationInContainer.boundingBox());
    return !regionFilled;
}

ListBasedHitTestBehavior HitTestResult::addNodeToListBasedTestResult(Node* node, const HitTestLocation& location, const Region& region)
{
    // If not a list-based test, stop testing because the hit has been found.
    if (!hitTestRequest().listBased())
        return StopHitTesting;

    if (!node)
        return ContinueHitTesting;

    mutableListBasedTestResult().add(node);

    if (hitTestRequest().penetratingList())
        return ContinueHitTesting;

    return region.contains(location.boundingBox()) ? StopHitTesting : ContinueHitTesting;
}

bool EllipsisBox::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
{
    // FIXME: the call to roundedLayoutPoint() below is temporary and should be removed once
    // the transition to LayoutUnit-based types is complete (crbug.com/321237)
    LayoutPoint adjustedLocation = accumulatedOffset + topLeft();

    LayoutPoint boxOrigin = locationIncludingFlipping();
    boxOrigin.moveBy(accumulatedOffset);
    LayoutRect boundsRect(boxOrigin, size());
    if (visibleToHitTestRequest(result.hitTestRequest()) && boundsRect.intersects(LayoutRect(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0)))) {
        lineLayoutItem().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
        if (result.addNodeToListBasedTestResult(lineLayoutItem().node(), locationInContainer, boundsRect) == StopHitTesting)
            return true;
    }

    return false;
}

bool InlineTextBox::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit /* lineTop */, LayoutUnit /*lineBottom*/)
{
    if (isLineBreak())
        return false;

    LayoutPoint boxOrigin = locationIncludingFlipping();
    boxOrigin.moveBy(accumulatedOffset);
    LayoutRect rect(boxOrigin, size());
    // FIXME: both calls to rawValue() below is temporary and should be removed once the transition
    // to LayoutUnit-based types is complete (crbug.com/321237)
    if (m_truncation != cFullTruncation && visibleToHitTestRequest(result.hitTestRequest()) && locationInContainer.intersects(rect)) {
        lineLayoutItem().updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - toLayoutSize(accumulatedOffset)));
        if (!result.addNodeToListBasedTestResult(lineLayoutItem().node(), locationInContainer, rect))
            return true;
    }
    return false;
}

bool RenderView::hitTest(const HitTestRequest& request, const HitTestLocation& location, HitTestResult& result)
{
    if (layer()->hitTest(request, location, result))
        return true;

    // FIXME: Consider if this test should be done unconditionally.
    if (request.allowsFrameScrollbars()) {
        // ScrollView scrollbars are not the same as RenderLayer scrollbars tested by RenderLayer::hitTestOverflowControls,
        // so we need to test ScrollView scrollbars separately here.
        Scrollbar* frameScrollbar = frameView().scrollbarAtPoint(location.roundedPoint());
        if (frameScrollbar) {
            result.setScrollbar(frameScrollbar);
            return true;
        }
    }

    return false;
}

bool HitTestResult::addNodeToRectBasedTestResult(Node* node, const HitTestRequest& request, const HitTestLocation& locationInContainer, const LayoutRect& rect)
{
    // If it is not a rect-based hit test, this method has to be no-op.
    // Return false, so the hit test stops.
    if (!isRectBasedTest())
        return false;

    // If node is null, return true so the hit test can continue.
    if (!node)
        return true;

    if (request.disallowsShadowContent())
        node = node->document()->ancestorInThisScope(node);

    mutableRectBasedTestResult().add(node);

    bool regionFilled = rect.contains(locationInContainer.boundingBox());
    return !regionFilled;
}

bool InlineBox::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit /* lineTop */, LayoutUnit /* lineBottom */)
{
    // Hit test all phases of replaced elements atomically, as though the replaced element established its
    // own stacking context.  (See Appendix E.2, section 6.4 on inline block/table elements in the CSS2.1
    // specification.)
    LayoutPoint childPoint = accumulatedOffset;
    if (parent()->lineLayoutItem().hasFlippedBlocksWritingMode()) // Faster than calling containingBlock().
        childPoint = layoutObject().containingBlock()->flipForWritingModeForChild(&toLayoutBox(layoutObject()), childPoint);

    if (lineLayoutItem().style()->hasBorderRadius()) {
        LayoutRect borderRect = logicalFrameRect();
        borderRect.moveBy(accumulatedOffset);
        FloatRoundedRect border = lineLayoutItem().style()->getRoundedBorderFor(borderRect);
        if (!locationInContainer.intersects(border))
            return false;
    }

    return lineLayoutItem().hitTest(result, locationInContainer, childPoint);
}

bool RenderTextControlSingleLine::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
    if (!RenderTextControl::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction))
        return false;

    // Say that we hit the inner text element if
    //  - we hit a node inside the inner text element,
    //  - we hit the <input> element (e.g. we're over the border or padding), or
    //  - we hit regions not in any decoration buttons.
    HTMLElement* container = containerElement();
    if (result.innerNode()->isDescendantOf(innerTextElement()) || result.innerNode() == &inputElement() || (container && container == result.innerNode())) {
        LayoutPoint pointInParent = locationInContainer.point();
        if (container && innerBlockElement()) {
            if (innerBlockElement()->renderBox())
                pointInParent -= toLayoutSize(innerBlockElement()->renderBox()->location());
            if (container->renderBox())
                pointInParent -= toLayoutSize(container->renderBox()->location());
        }
        hitInnerTextElement(result, pointInParent, accumulatedOffset);
    }
    return true;
}