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));
}
示例#2
0
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;
}