C++ LayoutBox::borderTop方法代码示例

LayoutState::LayoutState(LayoutBox& layoutObject, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, bool containingBlockLogicalWidthChanged)
    : m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged)
    , m_next(layoutObject.view()->layoutState())
    , m_layoutObject(layoutObject)
{
    if (layoutObject.isLayoutFlowThread())
        m_flowThread = toLayoutFlowThread(&layoutObject);
    else if (!layoutObject.isOutOfFlowPositioned() && !layoutObject.isColumnSpanAll())
        m_flowThread = m_next->flowThread();
    else
        m_flowThread = nullptr;
    layoutObject.view()->pushLayoutState(*this);
    bool fixed = layoutObject.isOutOfFlowPositioned() && layoutObject.style()->position() == FixedPosition;
    if (fixed) {
        // FIXME: This doesn't work correctly with transforms.
        FloatPoint fixedOffset = layoutObject.view()->localToAbsolute(FloatPoint(), IsFixed);
        m_layoutOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
    } else {
        m_layoutOffset = m_next->m_layoutOffset + offset;
    }

    if (layoutObject.isOutOfFlowPositioned() && !fixed) {
        if (LayoutObject* container = layoutObject.container()) {
            if (container->style()->hasInFlowPosition() && container->isLayoutInline())
                m_layoutOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(layoutObject);
        }
    }
    // If we establish a new page height, then cache the offset to the top of the first page.
    // We can compare this later on to figure out what part of the page we're actually on,
    if (pageLogicalHeight || layoutObject.isLayoutFlowThread()) {
        m_pageLogicalHeight = pageLogicalHeight;
        bool isFlipped = layoutObject.style()->isFlippedBlocksWritingMode();
        m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? layoutObject.borderLeft() + layoutObject.paddingLeft() : layoutObject.borderRight() + layoutObject.paddingRight()),
            m_layoutOffset.height() + (!isFlipped ? layoutObject.borderTop() + layoutObject.paddingTop() : layoutObject.borderBottom() + layoutObject.paddingBottom()));
        m_pageLogicalHeightChanged = pageLogicalHeightChanged;
        m_isPaginated = true;
    } else if (m_layoutObject.isSVG() && !m_layoutObject.isSVGRoot()) {
        // Pagination inside SVG is not allowed.
        m_flowThread = nullptr;
        m_pageLogicalHeightChanged = false;
        m_isPaginated = false;
    } else {
        // If we don't establish a new page height, then propagate the old page height and offset down.
        m_pageLogicalHeight = m_next->m_pageLogicalHeight;
        m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
        m_pageOffset = m_next->m_pageOffset;

        // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
        // writing mode roots.
        if (layoutObject.isUnsplittableForPagination()) {
            m_flowThread = nullptr;
            m_pageLogicalHeight = 0;
            m_isPaginated = false;
        } else {
            m_isPaginated = m_pageLogicalHeight || m_flowThread;
        }
    }

    // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}

inline LayoutUnit borderAndPaddingBeforeInWritingMode(const LayoutBox& layoutBox, WritingMode writingMode)
{
    switch (writingMode) {
    case TopToBottomWritingMode: return layoutBox.borderTop() + layoutBox.paddingTop();
    case LeftToRightWritingMode: return layoutBox.borderLeft() + layoutBox.paddingLeft();
    case RightToLeftWritingMode: return layoutBox.borderRight() + layoutBox.paddingRight();
    }

    ASSERT_NOT_REACHED();
    return layoutBox.borderAndPaddingBefore();
}

inline LayoutUnit borderAndPaddingStartWithStyleForWritingMode(const LayoutBox& layoutBox, const ComputedStyle* style)
{
    if (style->isHorizontalWritingMode()) {
        if (style->isLeftToRightDirection())
            return layoutBox.borderLeft() + layoutBox.paddingLeft();

        return layoutBox.borderRight() + layoutBox.paddingRight();
    }
    if (style->isLeftToRightDirection())
        return layoutBox.borderTop() + layoutBox.paddingTop();

    return layoutBox.borderBottom() + layoutBox.paddingBottom();
}

void ThemePainterDefault::setupMenuListArrow(
    const LayoutBox& box,
    const IntRect& rect,
    WebThemeEngine::ExtraParams& extraParams) {
  const int left = rect.x() + box.borderLeft();
  const int right = rect.x() + rect.width() - box.borderRight();
  const int middle = rect.y() + rect.height() / 2;

  extraParams.menuList.arrowY = middle;
  float arrowBoxWidth = m_theme.clampedMenuListArrowPaddingSize(
      box.frameView()->getHostWindow(), box.styleRef());
  float arrowScaleFactor = arrowBoxWidth / m_theme.scrollbarThicknessInDIP();
  if (useMockTheme()) {
    // The size and position of the drop-down button is different between
    // the mock theme and the regular aura theme.

    // Padding inside the arrowBox.
    float extraPadding = 2 * arrowScaleFactor;
    float arrowSize =
        std::min(arrowBoxWidth,
                 static_cast<float>(rect.height() - box.borderTop() -
                                    box.borderBottom())) -
        2 * extraPadding;
    // |arrowX| is the middle position for mock theme engine.
    extraParams.menuList.arrowX =
        (box.styleRef().direction() == RTL)
            ? rect.x() + extraPadding + (arrowSize / 2)
            : right - (arrowSize / 2) - extraPadding;
    extraParams.menuList.arrowSize = arrowSize;
  } else {
    // TODO(tkent): This should be 7.0 to match scroll bar buttons.
    float arrowSize = 6.0 * arrowScaleFactor;
    // Put the 6px arrow at the center of paddingForArrow area.
    // |arrowX| is the left position for Aura theme engine.
    extraParams.menuList.arrowX = (box.styleRef().direction() == RTL)
                                      ? left + (arrowBoxWidth - arrowSize) / 2
                                      : right - (arrowBoxWidth + arrowSize) / 2;
    extraParams.menuList.arrowSize = arrowSize;
  }
  extraParams.menuList.arrowColor = box.resolveColor(CSSPropertyColor).rgb();
}