C++ RenderObject::hasOverflowClip方法代码示例

int RenderCanvas::docWidth() const
{
    if (m_cachedDocWidth != -1)
        return m_cachedDocWidth;

    int w;
    if (m_pagedMode || !m_view)
        w = m_width;
    else
        w = 0;

    RenderObject *fc = firstChild();
    if(fc) {
        // ow: like effectiveWidth() but without the negative
        const int ow = fc->hasOverflowClip() ? fc->width() : fc->overflowWidth();
        int dw = ow + fc->marginLeft() + fc->marginRight();
        int rightmostPos = fc->rightmostPosition(false);
// kdDebug(6040) << "w " << w << " rightmostPos " << rightmostPos << " dw " << dw << " fc->rw " << fc->effectiveWidth() << " fc->width() " << fc->width() << endl;
        if( rightmostPos > dw )
            dw = rightmostPos;
        rightmostPos = rightmostAbsolutePosition();
        if ( rightmostPos > dw )
            dw = rightmostPos;
        if( dw > w )
            w = dw;
    }

    RenderLayer *layer = m_layer;
    w = kMax( w, layer->xPos() + layer->width() );
// kdDebug(6040) << "w " << w << " layer(" << layer->renderer()->renderName() << ")->width " << layer->width() << " rm " << (layer->xPos() + layer->width()) << " width() " << layer->renderer()->width() << " rw " << layer->renderer()->effectiveWidth() << endl;
    return w;
}

LayoutState::LayoutState(RenderObject* root)
    : m_clipped(false)
    , m_isPaginated(false)
    , m_pageLogicalHeightChanged(false)
#if !ASSERT_DISABLED
    , m_layoutDeltaXSaturated(false)
    , m_layoutDeltaYSaturated(false)
#endif
    , m_columnInfo(0)
    , m_lineGrid(0)
    , m_next(0)
    , m_shapeInsideInfo(0)
    , m_pageLogicalHeight(0)
#ifndef NDEBUG
    , m_renderer(root)
#endif
{
    RenderObject* container = root->container();
    FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), UseTransforms);
    m_paintOffset = LayoutSize(absContentPoint.x(), absContentPoint.y());

    if (container->hasOverflowClip()) {
        m_clipped = true;
        RenderBox* containerBox = toRenderBox(container);
        m_clipRect = LayoutRect(toPoint(m_paintOffset), containerBox->cachedSizeForOverflowClip());
        m_paintOffset -= containerBox->scrolledContentOffset();
    }
}

LayoutState::LayoutState(RenderObject* root)
    : m_clipped(false)
    , m_isPaginated(false)
    , m_pageLogicalHeight(0)
    , m_pageLogicalHeightChanged(false)
    , m_columnInfo(0)
    , m_lineGrid(0)
    , m_next(0)
#ifndef NDEBUG
    , m_renderer(root)
#endif
#if ENABLE(CSS_EXCLUSIONS)
    , m_exclusionShapeInsideInfo(0)
#endif
{
    RenderObject* container = root->container();
    FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
    m_paintOffset = LayoutSize(absContentPoint.x(), absContentPoint.y());

    if (container->hasOverflowClip()) {
        m_clipped = true;
        RenderBox* containerBox = toRenderBox(container);
        m_clipRect = LayoutRect(toPoint(m_paintOffset), containerBox->cachedSizeForOverflowClip());
        m_paintOffset -= containerBox->scrolledContentOffset();
    }
}

LayoutState::LayoutState(RenderObject* root)
    : m_clipped(false)
    , m_pageLogicalHeight(0)
    , m_pageLogicalHeightChanged(false)
    , m_columnInfo(0)
    , m_next(0)
#ifndef NDEBUG
    , m_renderer(root)
#endif
{
    RenderObject* container = root->container();
    // [SonyEricsson]: Check if container is null and in that case create an empty size
    // to avoid a crash dereferencing a null pointer.
    if (container) {
        FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
        m_paintOffset = IntSize(absContentPoint.x(), absContentPoint.y());
    } else {
        m_paintOffset = IntSize();
    }

    if (container->hasOverflowClip()) {
        RenderLayer* layer = toRenderBoxModelObject(container)->layer();
        m_clipped = true;
        m_clipRect = IntRect(toPoint(m_paintOffset), layer->size());
        m_paintOffset -= layer->scrolledContentOffset();
    }
}

static void applyClipRects(const ClipRectsContext& context, RenderObject& renderer, LayoutPoint offset, ClipRects& clipRects)
{
    ASSERT(renderer.hasOverflowClip() || renderer.hasClip());

    if (renderer.hasOverflowClip()) {
        ClipRect newOverflowClip = toRenderBox(renderer).overflowClipRect(offset);
        newOverflowClip.setHasRadius(renderer.style()->hasBorderRadius());
        clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
        if (renderer.isPositioned())
            clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
    }

    if (renderer.hasClip()) {
        LayoutRect newClip = toRenderBox(renderer).clipRect(offset);
        clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()));
        clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()));
    }
}

static void applyClipRects(const ClipRectsContext& context, RenderObject& renderer, LayoutPoint offset, ClipRects& clipRects)
{
    ASSERT(renderer.hasOverflowClip() || renderer.hasClip());

    RenderView* view = renderer.view();
    ASSERT(view);
    if (clipRects.fixed() && context.rootLayer->renderer() == view)
        offset -= view->frameView()->scrollOffsetForFixedPosition();

    if (renderer.hasOverflowClip()) {
        ClipRect newOverflowClip = toRenderBox(renderer).overflowClipRect(offset, context.scrollbarRelevancy);
        newOverflowClip.setHasRadius(renderer.style()->hasBorderRadius());
        clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
        if (renderer.isPositioned())
            clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
    }

    if (renderer.hasClip()) {
        LayoutRect newClip = toRenderBox(renderer).clipRect(offset);
        clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()));
        clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()));
        clipRects.setFixedClipRect(intersection(newClip, clipRects.fixedClipRect()));
    }
}

LayoutState::LayoutState(RenderObject* root)
    : m_clipped(false)
    , m_next(0)
#ifndef NDEBUG
    , m_renderer(root)
#endif
{
    RenderObject* container = root->container();
    FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
    m_offset = IntSize(absContentPoint.x(), absContentPoint.y());

    if (container->hasOverflowClip()) {
        RenderLayer* layer = toRenderBoxModelObject(container)->layer();
        m_clipped = true;
        m_clipRect = IntRect(toPoint(m_offset), layer->size());
        m_offset -= layer->scrolledContentOffset();
    }
}

static QRect enclosingPositionedRect (RenderObject *n)
{
    RenderObject *enclosingParent =  n->containingBlock();
    QRect rect(0,0,0,0);
    if (enclosingParent) {
        int ox, oy;
        enclosingParent->absolutePosition(ox, oy);
        int off = 0;
        if (!enclosingParent->hasOverflowClip()) {
            ox += enclosingParent->overflowLeft();
            oy += enclosingParent->overflowTop();
        }
        rect.setX(ox);
        rect.setY(oy);
        rect.setWidth(enclosingParent->effectiveWidth());
        rect.setHeight(enclosingParent->effectiveHeight());
    }
    return rect;
}

static bool isDeletableElement(const Node* node)
{
    if (!node || !node->isHTMLElement() || !node->inDocument() || !node->isContentEditable())
        return false;

    // In general we want to only draw the UI arround object of a certain area, but we still keep the min width/height to
    // make sure we don't end up with very thin or very short elements getting the UI.
    const int minimumArea = 2500;
    const int minimumWidth = 48;
    const int minimumHeight = 16;
    const unsigned minimumVisibleBorders = 1;

    RenderObject* renderer = node->renderer();
    if (!renderer || !renderer->isBox())
        return false;

    // Disallow the body element since it isn't practical to delete, and the deletion UI would be clipped.
    if (node->hasTagName(bodyTag))
        return false;

    // Disallow elements with any overflow clip, since the deletion UI would be clipped as well. <rdar://problem/6840161>
    if (renderer->hasOverflowClip())
        return false;

    // Disallow Mail blockquotes since the deletion UI would get in the way of editing for these.
    if (isMailBlockquote(node))
        return false;

    RenderBox* box = toRenderBox(renderer);
    IntRect borderBoundingBox = box->borderBoundingBox();
    if (borderBoundingBox.width() < minimumWidth || borderBoundingBox.height() < minimumHeight)
        return false;

    if ((borderBoundingBox.width() * borderBoundingBox.height()) < minimumArea)
        return false;

    if (renderer->isTable())
        return true;

    if (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(iframeTag))
        return true;

    if (renderer->isPositioned())
        return true;

    if (renderer->isRenderBlock() && !renderer->isTableCell()) {
        RenderStyle* style = renderer->style();
        if (!style)
            return false;

        // Allow blocks that have background images
        if (style->hasBackgroundImage() && style->backgroundImage()->canRender(1.0f))
            return true;

        // Allow blocks with a minimum number of non-transparent borders
        unsigned visibleBorders = style->borderTop().isVisible() + style->borderBottom().isVisible() + style->borderLeft().isVisible() + style->borderRight().isVisible();
        if (visibleBorders >= minimumVisibleBorders)
            return true;

        // Allow blocks that have a different background from it's parent
        Node* parentNode = node->parentNode();
        if (!parentNode)
            return false;

        RenderObject* parentRenderer = parentNode->renderer();
        if (!parentRenderer)
            return false;

        RenderStyle* parentStyle = parentRenderer->style();
        if (!parentStyle)
            return false;

        if (style->hasBackground() && (!parentStyle->hasBackground() || style->backgroundColor() != parentStyle->backgroundColor()))
            return true;
    }

    return false;
}