C++ LayoutSize::height方法代码示例

void TransformState::translateTransform(const LayoutSize& offset)
{
    if (m_direction == ApplyTransformDirection)
        m_accumulatedTransform->translateRight(offset.width(), offset.height());
    else
        m_accumulatedTransform->translate(offset.width(), offset.height());
}

bool canScrollInDirection(const LocalFrame* frame, FocusType type)
{
    if (!frame->view())
        return false;
    ScrollbarMode verticalMode;
    ScrollbarMode horizontalMode;
    frame->view()->calculateScrollbarModesForLayoutAndSetViewportRenderer(horizontalMode, verticalMode);
    if ((type == FocusTypeLeft || type == FocusTypeRight) && ScrollbarAlwaysOff == horizontalMode)
        return false;
    if ((type == FocusTypeUp || type == FocusTypeDown) &&  ScrollbarAlwaysOff == verticalMode)
        return false;
    LayoutSize size = frame->view()->contentsSize();
    LayoutSize offset = frame->view()->scrollOffset();
    LayoutRect rect = frame->view()->visibleContentRect(IncludeScrollbars);

    switch (type) {
    case FocusTypeLeft:
        return offset.width() > 0;
    case FocusTypeUp:
        return offset.height() > 0;
    case FocusTypeRight:
        return rect.width() + offset.width() < size.width();
    case FocusTypeDown:
        return rect.height() + offset.height() < size.height();
    default:
        ASSERT_NOT_REACHED();
        return false;
    }
}

IntRect RenderVideo::videoBox() const
{
    if (m_cachedImageSize.isEmpty() && videoElement()->shouldDisplayPosterImage())
        return IntRect();

    LayoutSize elementSize;
    if (videoElement()->shouldDisplayPosterImage())
        elementSize = m_cachedImageSize;
    else
        elementSize = intrinsicSize();

    IntRect contentRect = pixelSnappedIntRect(contentBoxRect());
    if (elementSize.isEmpty() || contentRect.isEmpty())
        return IntRect();

    LayoutRect renderBox = contentRect;
    LayoutUnit ratio = renderBox.width() * elementSize.height() - renderBox.height() * elementSize.width();
    if (ratio > 0) {
        LayoutUnit newWidth = renderBox.height() * elementSize.width() / elementSize.height();
        // Just fill the whole area if the difference is one pixel or less (in both sides)
        if (renderBox.width() - newWidth > 2)
            renderBox.setWidth(newWidth);
        renderBox.move((contentRect.width() - renderBox.width()) / 2, 0);
    } else if (ratio < 0) {
        LayoutUnit newHeight = renderBox.width() * elementSize.height() / elementSize.width();
        if (renderBox.height() - newHeight > 2)
            renderBox.setHeight(newHeight);
        renderBox.move(0, (contentRect.height() - renderBox.height()) / 2);
    }

    return pixelSnappedIntRect(renderBox);
}

bool canScrollInDirection(const Frame* frame, FocusDirection direction)
{
    if (!frame->view())
        return false;
    ScrollbarMode verticalMode;
    ScrollbarMode horizontalMode;
    frame->view()->calculateScrollbarModesForLayout(horizontalMode, verticalMode);
    if ((direction == FocusDirectionLeft || direction == FocusDirectionRight) && ScrollbarAlwaysOff == horizontalMode)
        return false;
    if ((direction == FocusDirectionUp || direction == FocusDirectionDown) &&  ScrollbarAlwaysOff == verticalMode)
        return false;
    LayoutSize size = frame->view()->totalContentsSize();
    LayoutSize offset = frame->view()->scrollOffset();
    LayoutRect rect = frame->view()->visibleContentRectIncludingScrollbars();

    switch (direction) {
    case FocusDirectionLeft:
        return offset.width() > 0;
    case FocusDirectionUp:
        return offset.height() > 0;
    case FocusDirectionRight:
        return rect.width() + offset.width() < size.width();
    case FocusDirectionDown:
        return rect.height() + offset.height() < size.height();
    default:
        ASSERT_NOT_REACHED();
        return false;
    }
}

LayoutSize ImageResource::imageSizeForLayoutObject(const LayoutObject* layoutObject, float multiplier, SizeType sizeType)
{
    ASSERT(!isPurgeable());

    if (!m_image)
        return LayoutSize();

    LayoutSize imageSize;

    if (m_image->isBitmapImage() && (layoutObject && layoutObject->shouldRespectImageOrientation() == RespectImageOrientation))
        imageSize = LayoutSize(toBitmapImage(m_image.get())->sizeRespectingOrientation());
    else if (m_image->isSVGImage() && sizeType == NormalSize)
        imageSize = LayoutSize(svgImageSizeForLayoutObject(layoutObject));
    else
        imageSize = LayoutSize(m_image->size());

    if (multiplier == 1.0f)
        return imageSize;

    // Don't let images that have a width/height >= 1 shrink below 1 when zoomed.
    float widthScale = m_image->hasRelativeWidth() ? 1.0f : multiplier;
    float heightScale = m_image->hasRelativeHeight() ? 1.0f : multiplier;
    LayoutSize minimumSize(imageSize.width() > 0 ? 1 : 0, imageSize.height() > 0 ? 1 : 0);
    imageSize.scale(widthScale, heightScale);
    imageSize.clampToMinimumSize(minimumSize);
    ASSERT(multiplier != 1.0f || (imageSize.width().fraction() == 0.0f && imageSize.height().fraction() == 0.0f));
    return imageSize;
}

LayoutSize CachedImage::imageSizeForRenderer(const RenderObject* renderer, float multiplier, SizeType sizeType)
{
    if (!m_image)
        return LayoutSize();

    LayoutSize imageSize;

    if (is<BitmapImage>(*m_image) && renderer && renderer->shouldRespectImageOrientation() == RespectImageOrientation)
        imageSize = LayoutSize(downcast<BitmapImage>(*m_image).sizeRespectingOrientation());
    else if (is<SVGImage>(*m_image) && sizeType == UsedSize)
        imageSize = LayoutSize(m_svgImageCache->imageSizeForRenderer(renderer));
    else
        imageSize = LayoutSize(m_image->size());

    if (multiplier == 1.0f)
        return imageSize;
        
    // Don't let images that have a width/height >= 1 shrink below 1 when zoomed.
    float widthScale = m_image->hasRelativeWidth() ? 1.0f : multiplier;
    float heightScale = m_image->hasRelativeHeight() ? 1.0f : multiplier;
    LayoutSize minimumSize(imageSize.width() > 0 ? 1 : 0, imageSize.height() > 0 ? 1 : 0);
    imageSize.scale(widthScale, heightScale);
    imageSize.clampToMinimumSize(minimumSize);
    ASSERT(multiplier != 1.0f || (imageSize.width().fraction() == 0.0f && imageSize.height().fraction() == 0.0f));
    return imageSize;
}

LayoutSize LayoutSize::constrainedBetween(const LayoutSize& min, const LayoutSize& max) const
{
    return {
        std::max(min.width(), std::min(max.width(), m_width)),
        std::max(min.height(), std::min(max.height(), m_height))
    };
}

LayoutBoxExtent NinePieceImage::computeSlices(const LayoutSize& size, const LengthBox& lengths, int scaleFactor)
{
    LayoutUnit top    = std::min<LayoutUnit>(size.height(), valueForLength(lengths.top(),    size.height())) * scaleFactor;
    LayoutUnit right  = std::min<LayoutUnit>(size.width(),  valueForLength(lengths.right(),  size.width()))  * scaleFactor;
    LayoutUnit bottom = std::min<LayoutUnit>(size.height(), valueForLength(lengths.bottom(), size.height())) * scaleFactor;
    LayoutUnit left   = std::min<LayoutUnit>(size.width(),  valueForLength(lengths.left(),   size.width()))  * scaleFactor;
    return LayoutBoxExtent(top, right, bottom, left);
}

PassOwnPtr<Shape> Shape::createShape(const LayoutSize& logicalSize, const LayoutSize& logicalRadii, WritingMode writingMode, Length margin, Length padding)
{
    FloatRect rect(0, 0, logicalSize.width(), logicalSize.height());
    FloatSize radii(logicalRadii.width(), logicalRadii.height());
    FloatRoundedRect bounds(rect, radii, radii, radii, radii);

    OwnPtr<Shape> shape = createBoxShape(bounds);
    shape->m_writingMode = writingMode;
    shape->m_margin = floatValueForLength(margin, 0);
    shape->m_padding = floatValueForLength(padding, 0);

    return shape.release();
}

bool ImageDocument::imageFitsInWindow()
{
    if (!m_imageElement)
        return true;

    FrameView* view = this->view();
    if (!view)
        return true;

    LayoutSize imageSize = this->imageSize();
    LayoutSize windowSize = LayoutSize(view->width(), view->height());
    return imageSize.width() <= windowSize.width() && imageSize.height() <= windowSize.height();
}

int RenderListBox::listIndexAtOffset(const LayoutSize& offset)
{
    if (!numItems())
        return -1;

    if (offset.height() < borderTop() + paddingTop() || offset.height() > height() - paddingBottom() - borderBottom())
        return -1;

    LayoutUnit scrollbarWidth = m_vBar ? m_vBar->width() : LayoutUnit(0);
    if (offset.width() < borderLeft() + paddingLeft() || offset.width() > width() - borderRight() - paddingRight() - scrollbarWidth)
        return -1;

    int newOffset = (offset.height() - borderTop() - paddingTop()) / itemHeight() + m_indexOffset;
    return newOffset < numItems() ? newOffset : -1;
}

void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    GraphicsContext* context = paintInfo.context;

    LayoutRect contentRect = contentBoxRect();
    contentRect.moveBy(paintOffset);
    LayoutRect paintRect = replacedContentRect();
    paintRect.moveBy(paintOffset);

    bool clip = !contentRect.contains(paintRect);
    if (clip) {
        // Not allowed to overflow the content box.
        paintInfo.context->save();
        paintInfo.context->clip(pixelSnappedIntRect(contentRect));
    }

    // FIXME: InterpolationNone should be used if ImageRenderingOptimizeContrast is set.
    // See bug for more details: crbug.com/353716.
    InterpolationQuality interpolationQuality = style()->imageRendering() == ImageRenderingOptimizeContrast ? InterpolationLow : CanvasDefaultInterpolationQuality;

    HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
    LayoutSize layoutSize = contentRect.size();
    if (style()->imageRendering() == ImageRenderingPixelated
        && (layoutSize.width() > canvas->width() || layoutSize.height() > canvas->height() || layoutSize == canvas->size())) {
        interpolationQuality = InterpolationNone;
    }

    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
    context->setImageInterpolationQuality(interpolationQuality);
    canvas->paint(context, paintRect);
    context->setImageInterpolationQuality(previousInterpolationQuality);

    if (clip)
        context->restore();
}

void RenderMultiColumnFlowThread::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
{
    // First get the transform state's point into the block flow thread's physical coordinate space.
    parent()->mapAbsoluteToLocalPoint(mode, transformState);
    LayoutPoint transformPoint = roundedLayoutPoint(transformState.mappedPoint());

    // Now walk through each region.
    const RenderMultiColumnSet* candidateColumnSet = nullptr;
    LayoutPoint candidatePoint;
    LayoutSize candidateContainerOffset;

    for (const auto& columnSet : childrenOfType<RenderMultiColumnSet>(*parent())) {
        candidateContainerOffset = columnSet.offsetFromContainer(parent(), LayoutPoint());

        candidatePoint = transformPoint - candidateContainerOffset;
        candidateColumnSet = &columnSet;

        // We really have no clue what to do with overflow. We'll just use the closest region to the point in that case.
        LayoutUnit pointOffset = isHorizontalWritingMode() ? candidatePoint.y() : candidatePoint.x();
        LayoutUnit regionOffset = isHorizontalWritingMode() ? columnSet.topLeftLocation().y() : columnSet.topLeftLocation().x();
        if (pointOffset < regionOffset + columnSet.logicalHeight())
            break;
    }

    // Once we have a good guess as to which region we hit tested through (and yes, this was just a heuristic, but it's
    // the best we could do), then we can map from the region into the flow thread.
    LayoutSize translationOffset = physicalTranslationFromRegionToFlow(candidateColumnSet, candidatePoint) + candidateContainerOffset;
    bool preserve3D = mode & UseTransforms && (parent()->style().preserves3D() || style().preserves3D());
    if (mode & UseTransforms && shouldUseTransformFromContainer(parent())) {
        TransformationMatrix t;
        getTransformFromContainer(parent(), translationOffset, t);
        transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
    } else
        transformState.move(translationOffset.width(), translationOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
}

LayoutRect InlineFlowBoxPainter::paintRectForImageStrip(const LayoutPoint& paintOffset, const LayoutSize& frameSize, TextDirection direction) const
{
    // We have a fill/border/mask image that spans multiple lines.
    // We need to adjust the offset by the width of all previous lines.
    // Think of background painting on inlines as though you had one long line, a single continuous
    // strip. Even though that strip has been broken up across multiple lines, you still paint it
    // as though you had one single line. This means each line has to pick up the background where
    // the previous line left off.
    LayoutUnit logicalOffsetOnLine = 0;
    LayoutUnit totalLogicalWidth;
    if (direction == LTR) {
        for (const InlineFlowBox* curr = m_inlineFlowBox.prevLineBox(); curr; curr = curr->prevLineBox())
            logicalOffsetOnLine += curr->logicalWidth();
        totalLogicalWidth = logicalOffsetOnLine;
        for (const InlineFlowBox* curr = &m_inlineFlowBox; curr; curr = curr->nextLineBox())
            totalLogicalWidth += curr->logicalWidth();
    } else {
        for (const InlineFlowBox* curr = m_inlineFlowBox.nextLineBox(); curr; curr = curr->nextLineBox())
            logicalOffsetOnLine += curr->logicalWidth();
        totalLogicalWidth = logicalOffsetOnLine;
        for (const InlineFlowBox* curr = &m_inlineFlowBox; curr; curr = curr->prevLineBox())
            totalLogicalWidth += curr->logicalWidth();
    }
    LayoutUnit stripX = paintOffset.x() - (m_inlineFlowBox.isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
    LayoutUnit stripY = paintOffset.y() - (m_inlineFlowBox.isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
    LayoutUnit stripWidth = m_inlineFlowBox.isHorizontal() ? totalLogicalWidth : frameSize.width();
    LayoutUnit stripHeight = m_inlineFlowBox.isHorizontal() ? frameSize.height() : totalLogicalWidth;
    return LayoutRect(stripX, stripY, stripWidth, stripHeight);
}

void RenderReplaced::layout()
{
    StackStats::LayoutCheckPoint layoutCheckPoint;
    ASSERT(needsLayout());
    
    LayoutRepainter repainter(*this, checkForRepaintDuringLayout());
    
    setHeight(minimumReplacedHeight());

    updateLogicalWidth();
    updateLogicalHeight();

    // Now that we've calculated our preferred layout, we check to see
    // if we should further constrain sizing to the intrinsic aspect ratio.
    if (style().aspectRatioType() == AspectRatioFromIntrinsic && !m_intrinsicSize.isEmpty()) {
        float aspectRatio = m_intrinsicSize.aspectRatio();
        LayoutSize frameSize = size();
        float frameAspectRatio = frameSize.aspectRatio();
        if (frameAspectRatio < aspectRatio)
            setHeight(computeReplacedLogicalHeightRespectingMinMaxHeight(frameSize.height() * frameAspectRatio / aspectRatio));
        else if (frameAspectRatio > aspectRatio)
            setWidth(computeReplacedLogicalWidthRespectingMinMaxWidth(frameSize.width() * aspectRatio / frameAspectRatio, ComputePreferred));
    }

    clearOverflow();
    addVisualEffectOverflow();
    updateLayerTransform();
    invalidateBackgroundObscurationStatus();

    repainter.repaintAfterLayout();
    clearNeedsLayout();
}