C++ FloatingObject::renderer方法代码示例

void LineWidth::fitBelowFloats(bool isFirstLine)
{
    ASSERT(!m_committedWidth);
    ASSERT(!fitsOnLine());

    LayoutUnit floatLogicalBottom;
    LayoutUnit lastFloatLogicalBottom = m_block.logicalHeight();
    float newLineWidth = m_availableWidth;
    float newLineLeft = m_left;
    float newLineRight = m_right;

    FloatingObject* lastFloatFromPreviousLine = (m_block.containsFloats() ? m_block.m_floatingObjects->set().last().get() : 0);
        if (lastFloatFromPreviousLine && lastFloatFromPreviousLine->renderer()->shapeOutsideInfo())
            return wrapNextToShapeOutside(isFirstLine);

    while (true) {
        floatLogicalBottom = m_block.nextFloatLogicalBottomBelow(lastFloatLogicalBottom, ShapeOutsideFloatShapeOffset);
        if (floatLogicalBottom <= lastFloatLogicalBottom)
            break;

        newLineWidth = availableWidthAtOffset(m_block, floatLogicalBottom, shouldIndentText(), newLineLeft, newLineRight);
        lastFloatLogicalBottom = floatLogicalBottom;

        if (newLineWidth >= m_uncommittedWidth)
            break;
    }
    updateLineDimension(lastFloatLogicalBottom, newLineWidth, newLineLeft, newLineRight);
}

static bool newFloatShrinksLine(const FloatingObject& newFloat, const RenderBlockFlow& block, bool isFirstLine)
{
    LayoutUnit blockOffset = block.logicalHeight();
    if (blockOffset >= block.logicalTopForFloat(newFloat) && blockOffset < block.logicalBottomForFloat(newFloat))
        return true;

    // initial-letter float always shrinks the first line.
    const auto& style = newFloat.renderer().style();
    if (isFirstLine && style.styleType() == FIRST_LETTER && !style.initialLetter().isEmpty())
        return true;
    return false;
}

inline bool ComputeFloatOffsetForLineLayoutAdapter<FloatingObject::FloatRight>::updateOffsetIfNeeded(const FloatingObject& floatingObject)
{
    LayoutUnit logicalLeft = m_renderer.logicalLeftForFloat(floatingObject);
    if (ShapeOutsideInfo* shapeOutside = floatingObject.renderer().shapeOutsideInfo()) {
        ShapeOutsideDeltas shapeDeltas = shapeOutside->computeDeltasForContainingBlockLine(m_renderer, floatingObject, m_lineTop, m_lineBottom - m_lineTop);
        if (!shapeDeltas.lineOverlapsShape())
            return false;

        logicalLeft += shapeDeltas.leftMarginBoxDelta();
    }
    if (logicalLeft < m_offset) {
        m_offset = logicalLeft;
        return true;
    }

    return false;
}

void LineWidth::shrinkAvailableWidthForNewFloatIfNeeded(const FloatingObject& newFloat)
{
    if (!newFloatShrinksLine(newFloat, m_block, m_isFirstLine))
        return;
#if ENABLE(CSS_SHAPES)
    ShapeOutsideDeltas shapeDeltas;
    if (ShapeOutsideInfo* shapeOutsideInfo = newFloat.renderer().shapeOutsideInfo()) {
        LayoutUnit lineHeight = m_block.lineHeight(m_isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
        shapeDeltas = shapeOutsideInfo->computeDeltasForContainingBlockLine(m_block, newFloat, m_block.logicalHeight(), lineHeight);
    }
#endif

    if (newFloat.type() == FloatingObject::FloatLeft) {
        float newLeft = m_block.logicalRightForFloat(newFloat);
        if (shouldIndentText() == IndentText && m_block.style().isLeftToRightDirection())
            newLeft += floorToInt(m_block.textIndentOffset());
#if ENABLE(CSS_SHAPES)
        if (shapeDeltas.isValid()) {
            if (shapeDeltas.lineOverlapsShape())
                newLeft += shapeDeltas.rightMarginBoxDelta();
            else // If the line doesn't overlap the shape, then we need to act as if this float didn't exist.
                newLeft = m_left;
        }
#endif
        m_left = std::max<float>(m_left, newLeft);
    } else {
        float newRight = m_block.logicalLeftForFloat(newFloat);
        if (shouldIndentText() == IndentText && !m_block.style().isLeftToRightDirection())
            newRight -= floorToInt(m_block.textIndentOffset());
#if ENABLE(CSS_SHAPES)
        if (shapeDeltas.isValid()) {
            if (shapeDeltas.lineOverlapsShape())
                newRight += shapeDeltas.leftMarginBoxDelta();
            else // If the line doesn't overlap the shape, then we need to act as if this float didn't exist.
                newRight = m_right;
        }
#endif
        m_right = std::min<float>(m_right, newRight);
    }

    computeAvailableWidthFromLeftAndRight();
}