C++ FrameView::children方法代码示例

Region ScrollingCoordinator::computeNonFastScrollableRegion(const Frame* frame, const IntPoint& frameLocation) const
{
#if ENABLE(IOS_TOUCH_EVENTS)
    // On iOS, we use nonFastScrollableRegion to represent the region covered by elements with touch event handlers.
    ASSERT(frame->isMainFrame());
    UNUSED_PARAM(frameLocation);

    Document* document = frame->document();
    if (!document)
        return Region();

    Vector<IntRect> touchRects;
    document->getTouchRects(touchRects);
    
    Region touchRegion;
    for (const auto& rect : touchRects)
        touchRegion.unite(rect);

    return touchRegion;
#else
    Region nonFastScrollableRegion;
    FrameView* frameView = frame->view();
    if (!frameView)
        return nonFastScrollableRegion;

    IntPoint offset = frameLocation;
    offset.moveBy(frameView->frameRect().location());
    offset.move(0, frameView->topContentInset());

    if (const FrameView::ScrollableAreaSet* scrollableAreas = frameView->scrollableAreas()) {
        for (FrameView::ScrollableAreaSet::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
            ScrollableArea* scrollableArea = *it;
            // Composited scrollable areas can be scrolled off the main thread.
            if (scrollableArea->usesCompositedScrolling())
                continue;
            IntRect box = scrollableArea->scrollableAreaBoundingBox();
            box.moveBy(offset);
            nonFastScrollableRegion.unite(box);
        }
    }

    for (const auto& child : frameView->children()) {
        if (!child->isPluginViewBase())
            continue;
        PluginViewBase* pluginViewBase = toPluginViewBase(child.get());
        if (pluginViewBase->wantsWheelEvents())
            nonFastScrollableRegion.unite(pluginViewBase->frameRect());
    }

    for (Frame* subframe = frame->tree().firstChild(); subframe; subframe = subframe->tree().nextSibling())
        nonFastScrollableRegion.unite(computeNonFastScrollableRegion(subframe, offset));

    return nonFastScrollableRegion;
#endif
}

// Return a set of rectangles that should not be overdrawn by the
// plugin ("cutouts"). This helps implement the "iframe shim"
// technique of overlaying a windowed plugin with content from the
// page. In a nutshell, iframe elements should occlude plugins when
// they occur higher in the stacking order.
void getPluginOcclusions(Element* element, Widget* parentWidget, const IntRect& frameRect, Vector<IntRect>& occlusions)
{
    RenderObject* pluginNode = element->renderer();
    ASSERT(pluginNode);
    if (!pluginNode->style())
        return;
    Vector<const RenderObject*> pluginZstack;
    Vector<const RenderObject*> iframeZstack;
    getObjectStack(pluginNode, &pluginZstack);

    if (!parentWidget->isFrameView())
        return;

    FrameView* parentFrameView = toFrameView(parentWidget);

    // Occlusions by iframes.
    const FrameView::ChildrenWidgetSet* children = parentFrameView->children();
    for (FrameView::ChildrenWidgetSet::const_iterator it = children->begin(); it != children->end(); ++it) {
        // We only care about FrameView's because iframes show up as FrameViews.
        if (!(*it)->isFrameView())
            continue;

        const FrameView* frameView = toFrameView(it->get());
        // Check to make sure we can get both the element and the RenderObject
        // for this FrameView, if we can't just move on to the next object.
        // FIXME: Plugin occlusion by remote frames is probably broken.
        HTMLElement* element = frameView->frame().deprecatedLocalOwner();
        if (!element || !element->renderer())
            continue;

        RenderObject* iframeRenderer = element->renderer();

        if (isHTMLIFrameElement(*element) && intersectsRect(iframeRenderer, frameRect)) {
            getObjectStack(iframeRenderer, &iframeZstack);
            if (iframeIsAbovePlugin(iframeZstack, pluginZstack))
                addToOcclusions(toRenderBox(iframeRenderer), occlusions);
        }
    }

    // Occlusions by top layer elements.
    // FIXME: There's no handling yet for the interaction between top layer and
    // iframes. For example, a plugin in the top layer will be occluded by an
    // iframe. And a plugin inside an iframe in the top layer won't be respected
    // as being in the top layer.
    const Element* ancestor = topLayerAncestor(element);
    Document* document = parentFrameView->frame().document();
    const WillBeHeapVector<RefPtrWillBeMember<Element> >& elements = document->topLayerElements();
    size_t start = ancestor ? elements.find(ancestor) + 1 : 0;
    for (size_t i = start; i < elements.size(); ++i)
        addTreeToOcclusions(elements[i]->renderer(), frameRect, occlusions);
}

Region ScrollingCoordinator::computeNonFastScrollableRegion(const Frame* frame, const IntPoint& frameLocation) const
{
    Region nonFastScrollableRegion;
    FrameView* frameView = frame->view();
    if (!frameView)
        return nonFastScrollableRegion;

    IntPoint offset = frameLocation;
    offset.moveBy(frameView->frameRect().location());

    if (const FrameView::ScrollableAreaSet* scrollableAreas = frameView->scrollableAreas()) {
        for (FrameView::ScrollableAreaSet::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
            ScrollableArea* scrollableArea = *it;
#if USE(ACCELERATED_COMPOSITING)
            // Composited scrollable areas can be scrolled off the main thread.
            if (scrollableArea->usesCompositedScrolling())
                continue;
#endif
            IntRect box = scrollableArea->scrollableAreaBoundingBox();
            box.moveBy(offset);
            nonFastScrollableRegion.unite(box);
        }
    }

    for (auto it = frameView->children().begin(), end = frameView->children().end(); it != end; ++it) {
        if (!(*it)->isPluginViewBase())
            continue;
        PluginViewBase* pluginViewBase = toPluginViewBase((*it).get());
        if (pluginViewBase->wantsWheelEvents())
            nonFastScrollableRegion.unite(pluginViewBase->frameRect());
    }

    for (Frame* subframe = frame->tree().firstChild(); subframe; subframe = subframe->tree().nextSibling())
        nonFastScrollableRegion.unite(computeNonFastScrollableRegion(subframe, offset));

    return nonFastScrollableRegion;
}

// Return a set of rectangles that should not be overdrawn by the
// plugin ("cutouts").  This helps implement the "iframe shim"
// technique of overlaying a windowed plugin with content from the
// page.  In a nutshell, iframe elements should occlude plugins when
// they occur higher in the stacking order.
void WebPluginContainerImpl::windowCutOutRects(const IntRect& frameRect,
        Vector<IntRect>& cutOutRects)
{
    RenderObject* pluginNode = m_element->renderer();
    ASSERT(pluginNode);
    if (!pluginNode->style())
        return;
    Vector<const RenderObject*> pluginZstack;
    Vector<const RenderObject*> iframeZstack;
    getObjectStack(pluginNode, &pluginZstack);

    // Get the parent widget
    Widget* parentWidget = this->parent();
    if (!parentWidget->isFrameView())
        return;

    FrameView* parentFrameView = static_cast<FrameView*>(parentWidget);

    const HashSet<RefPtr<Widget> >* children = parentFrameView->children();
    for (HashSet<RefPtr<Widget> >::const_iterator it = children->begin(); it != children->end(); ++it) {
        // We only care about FrameView's because iframes show up as FrameViews.
        if (!(*it)->isFrameView())
            continue;

        const FrameView* frameView =
            static_cast<const FrameView*>((*it).get());
        // Check to make sure we can get both the element and the RenderObject
        // for this FrameView, if we can't just move on to the next object.
        if (!frameView->frame() || !frameView->frame()->ownerElement()
                || !frameView->frame()->ownerElement()->renderer())
            continue;

        HTMLElement* element = frameView->frame()->ownerElement();
        RenderObject* iframeRenderer = element->renderer();

        if (element->hasTagName(HTMLNames::iframeTag)
                && iframeRenderer->absoluteBoundingBoxRect().intersects(frameRect)
                && (!iframeRenderer->style() || iframeRenderer->style()->visibility() == VISIBLE)) {
            getObjectStack(iframeRenderer, &iframeZstack);
            if (checkStackOnTop(iframeZstack, pluginZstack)) {
                IntPoint point =
                    roundedIntPoint(iframeRenderer->localToAbsolute());
                RenderBox* rbox = toRenderBox(iframeRenderer);
                IntSize size(rbox->width(), rbox->height());
                cutOutRects.append(IntRect(point, size));
            }
        }
    }
}

void Page::collectPluginViews(Vector<RefPtr<PluginViewBase>, 32>& pluginViewBases)
{
    for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext()) {
        FrameView* view = frame->view();
        if (!view)
            return;

        const HashSet<RefPtr<Widget> >* children = view->children();
        ASSERT(children);

        HashSet<RefPtr<Widget> >::const_iterator end = children->end();
        for (HashSet<RefPtr<Widget> >::const_iterator it = children->begin(); it != end; ++it) {
            Widget* widget = (*it).get();
            if (widget->isPluginViewBase())
                pluginViewBases.append(toPluginViewBase(widget));
        }
    }
}