C++ RenderRubyText类代码示例

RenderObject* RenderRubyRun::layoutSpecialExcludedChild(bool relayoutChildren)
{
    // Don't bother positioning the RenderRubyRun yet.
    RenderRubyText* rt = rubyText();
    if (!rt)
        return 0;
    if (relayoutChildren)
        rt->setChildNeedsLayout(true, false);
    rt->layoutIfNeeded();
    return rt;
}

RenderObject* RenderRubyRun::layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope& layoutScope)
{
    // Don't bother positioning the RenderRubyRun yet.
    RenderRubyText* rt = rubyText();
    if (!rt)
        return 0;
    if (relayoutChildren)
        layoutScope.setChildNeedsLayout(rt);
    rt->layoutIfNeeded();
    return rt;
}

RenderObject* RenderRubyRun::layoutSpecialExcludedChild(bool relayoutChildren)
{
    StackStats::LayoutCheckPoint layoutCheckPoint;
    // Don't bother positioning the RenderRubyRun yet.
    RenderRubyText* rt = rubyText();
    if (!rt)
        return 0;
    if (relayoutChildren)
        rt->setChildNeedsLayout(MarkOnlyThis);
    rt->layoutIfNeeded();
    return rt;
}

void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
    ASSERT(!needsLayout());

    startOverhang = 0;
    endOverhang = 0;

    RenderRubyBase* rubyBase = this->rubyBase();
    RenderRubyText* rubyText = this->rubyText();

    if (!rubyBase || !rubyText)
        return;

    if (!rubyBase->firstRootBox())
        return;

    int logicalWidth = this->logicalWidth();
    int logicalLeftOverhang = numeric_limits<int>::max();
    int logicalRightOverhang = numeric_limits<int>::max();
    for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
        logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
        logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
    }

    startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
    endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;

    if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        startOverhang = 0;

    if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        endOverhang = 0;

    // We overhang a ruby only if the neighboring render object is a text.
    // We can overhang the ruby by no more than half the width of the neighboring text
    // and no more than half the font size.
    int halfWidthOfFontSize = rubyText->style(firstLine)->fontSize() / 2;
    if (startOverhang)
        startOverhang = min<int>(startOverhang, min<int>(toRenderText(startRenderer)->minLogicalWidth(), halfWidthOfFontSize));
    if (endOverhang)
        endOverhang = min<int>(endOverhang, min<int>(toRenderText(endRenderer)->minLogicalWidth(), halfWidthOfFontSize));
}

bool InlineTextBox::getEmphasisMarkPosition(RenderStyle* style, TextEmphasisPosition& emphasisPosition) const
{
    // This function returns true if there are text emphasis marks and they are suppressed by ruby text.
    if (style->textEmphasisMark() == TextEmphasisMarkNone)
        return false;

    emphasisPosition = style->textEmphasisPosition();
    if (emphasisPosition == TextEmphasisPositionUnder)
        return true; // Ruby text is always over, so it cannot suppress emphasis marks under.

    RenderBlock* containingBlock = renderer().containingBlock();
    if (!containingBlock->isRubyBase())
        return true; // This text is not inside a ruby base, so it does not have ruby text over it.

    if (!containingBlock->parent()->isRubyRun())
        return true; // Cannot get the ruby text.

    RenderRubyText* rubyText = toRenderRubyRun(containingBlock->parent())->rubyText();

    // The emphasis marks over are suppressed only if there is a ruby text box and it not empty.
    return !rubyText || !rubyText->firstLineBox();
}

void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
    ASSERT(!needsLayout());

    startOverhang = 0;
    endOverhang = 0;

    RenderRubyBase* rubyBase = this->rubyBase();
    RenderRubyText* rubyText = this->rubyText();

    if (!rubyBase || !rubyText)
        return;

    if (!rubyBase->firstRootBox())
        return;

    int logicalWidth = this->logicalWidth();

    // No more than half a ruby is allowed to overhang.
    int logicalLeftOverhang = rubyText->style(firstLine)->fontSize() / 2;
    int logicalRightOverhang = logicalLeftOverhang;

    for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
        logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
        logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
    }

    startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
    endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;

    if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        startOverhang = 0;

    if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        endOverhang = 0;
}

void RenderRubyRun::layout()
{
    RenderBlockFlow::layout();
    
    RenderRubyText* rt = rubyText();
    if (!rt)
        return;

    rt->setLogicalLeft(0);
    
    // Place the RenderRubyText such that its bottom is flush with the lineTop of the first line of the RenderRubyBase.
    LayoutUnit lastLineRubyTextBottom = rt->logicalHeight();
    LayoutUnit firstLineRubyTextTop = 0;
    RootInlineBox* rootBox = rt->lastRootBox();
    if (rootBox) {
        // In order to align, we have to ignore negative leading.
        firstLineRubyTextTop = rt->firstRootBox()->logicalTopLayoutOverflow();
        lastLineRubyTextBottom = rootBox->logicalBottomLayoutOverflow();
    }
    
    if (isHorizontalWritingMode() && rt->style().rubyPosition() == RubyPositionInterCharacter) {
        // Bopomofo. We need to move the RenderRubyText over to the right side and center it
        // vertically relative to the base.
        const Font& font = style().font();
        float distanceBetweenBase = max(font.letterSpacing(), 2.0f * rt->style().font().fontMetrics().height());
        setWidth(width() + distanceBetweenBase - font.letterSpacing());
        if (RenderRubyBase* rb = rubyBase()) {
            LayoutUnit firstLineTop = 0;
            LayoutUnit lastLineBottom = logicalHeight();
            RootInlineBox* rootBox = rb->firstRootBox();
            if (rootBox)
                firstLineTop = rootBox->logicalTopLayoutOverflow();
            firstLineTop += rb->logicalTop();
            if (rootBox)
                lastLineBottom = rootBox->logicalBottomLayoutOverflow();
            lastLineBottom += rb->logicalTop();
            rt->setX(rb->x() + rb->width() - font.letterSpacing());
            LayoutUnit extent = lastLineBottom - firstLineTop;
            rt->setY(firstLineTop + (extent - rt->height()) / 2);
        }
    } else if (style().isFlippedLinesWritingMode() == (style().rubyPosition() == RubyPositionAfter)) {
        LayoutUnit firstLineTop = 0;
        if (RenderRubyBase* rb = rubyBase()) {
            RootInlineBox* rootBox = rb->firstRootBox();
            if (rootBox)
                firstLineTop = rootBox->logicalTopLayoutOverflow();
            firstLineTop += rb->logicalTop();
        }
        
        rt->setLogicalTop(-lastLineRubyTextBottom + firstLineTop);
    } else {
        LayoutUnit lastLineBottom = logicalHeight();
        if (RenderRubyBase* rb = rubyBase()) {
            RootInlineBox* rootBox = rb->lastRootBox();
            if (rootBox)
                lastLineBottom = rootBox->logicalBottomLayoutOverflow();
            lastLineBottom += rb->logicalTop();
        }

        rt->setLogicalTop(-firstLineRubyTextTop + lastLineBottom);
    }

    // Update our overflow to account for the new RenderRubyText position.
    computeOverflow(clientLogicalBottom());
}