C++ QRawFont::underlinePosition方法代码示例

void QSGTextNode::addTextLayout(const QPointF &position, QTextLayout *textLayout, const QColor &color,
                                QSGText::TextStyle style, const QColor &styleColor)
{
    QList<QGlyphRun> glyphsList(textLayout->glyphRuns());

    QSGGlyphNode *prevNode = 0;

    QFont font = textLayout->font();
    qreal underlinePosition, ascent, lineThickness;
    int decorations = NoDecoration;
    decorations |= (font.underline() ? Underline : 0);
    decorations |= (font.overline()  ? Overline  : 0);
    decorations |= (font.strikeOut() ? StrikeOut : 0);

    underlinePosition = ascent = lineThickness = 0;
    for (int i=0; i<glyphsList.size(); ++i) {
        QGlyphRun glyphs = glyphsList.at(i);
        QRawFont rawfont = glyphs.rawFont();
        prevNode = addGlyphs(position + QPointF(0, rawfont.ascent()), glyphs, color, style, styleColor);

        if (decorations) {
            qreal rawAscent = rawfont.ascent();
            if (decorations & Underline) {
                ascent = qMax(ascent, rawAscent);
                qreal pos = rawfont.underlinePosition();
                if (pos > underlinePosition) {
                    underlinePosition = pos;
                    // take line thickness from the rawfont with maximum underline
                    // position in this case
                    lineThickness = rawfont.lineThickness();
                }
            } else {
                // otherwise it's strike out or overline, we take line thickness
                // from the rawfont with maximum ascent
                if (rawAscent > ascent) {
                    ascent = rawAscent;
                    lineThickness = rawfont.lineThickness();
                }
            }
        }
    }

    if (decorations) {
        addTextDecorations(Decoration(decorations), position + QPointF(0, ascent), color,
                           textLayout->boundingRect().width(),
                           lineThickness, underlinePosition, ascent);
    }
}

void QSGTextNode::addTextBlock(const QPointF &position, QTextDocument *textDocument, const QTextBlock &block,
                               const QColor &overrideColor, QSGText::TextStyle style, const QColor &styleColor)
{
    if (!block.isValid())
        return;

    QPointF blockPosition = textDocument->documentLayout()->blockBoundingRect(block).topLeft();

    QTextBlock::iterator it = block.begin();
    while (!it.atEnd()) {
        QTextFragment fragment = it.fragment();
        if (!fragment.text().isEmpty()) {
            QTextCharFormat charFormat = fragment.charFormat();
            QColor color = overrideColor.isValid()
                    ? overrideColor
                    : charFormat.foreground().color();

            QList<QGlyphRun> glyphsList = fragment.glyphRuns();
            for (int i=0; i<glyphsList.size(); ++i) {
                QGlyphRun glyphs = glyphsList.at(i);
                QRawFont font = glyphs.rawFont();
                QSGGlyphNode *glyphNode = addGlyphs(position + blockPosition + QPointF(0, font.ascent()),
                                                    glyphs, color, style, styleColor);
                int decorations = (glyphs.overline() ? Overline : 0) |
                                  (glyphs.strikeOut() ? StrikeOut : 0) |
                                  (glyphs.underline() ? Underline : 0);
                if (decorations) {
                    QPointF baseLine = glyphNode->baseLine();
                    qreal width = glyphNode->boundingRect().width();
                    addTextDecorations(Decoration(decorations), baseLine, color, width,
                                       font.lineThickness(), font.underlinePosition(), font.ascent());
                }
            }
        }

        ++it;
    }
}

//.........这里部分代码省略.........
                    currentClipNode = 0;
                currentClipNodeUsed = false;

                if (node != 0) {
                    currentSelectionState = node->selectionState;
                    currentRect = node->boundingRect;

                    // Make sure currentRect is valid, otherwise the unite won't work
                    if (currentRect.isNull())
                        currentRect.setSize(QSizeF(1, 1));
                }
            } else {
                if (currentRect.isNull())
                    currentRect = node->boundingRect;
                else
                    currentRect = currentRect.united(node->boundingRect);
            }

            if (node != 0) {
                if (node->selectionState == Selected) {
                    node->clipNode = currentClipNode;
                    currentClipNodeUsed = true;
                }

                decorationRect = node->boundingRect;

                // If previous item(s) had underline and current does not, then we add the
                // pending lines to the lists and likewise for overlines and strikeouts
                if (!pendingUnderlines.isEmpty()
                        && !(node->decorations & QQuickTextNode::Underline)) {
                    addTextDecorations(pendingUnderlines, underlineOffset, underlineThickness);

                    pendingUnderlines.clear();

                    underlineOffset = 0.0;
                    underlineThickness = 0.0;
                }

                // ### Add pending when overlineOffset/thickness changes to minimize number of
                // nodes
                if (!pendingOverlines.isEmpty()) {
                    addTextDecorations(pendingOverlines, overlineOffset, overlineThickness);

                    pendingOverlines.clear();

                    overlineOffset = 0.0;
                    overlineThickness = 0.0;
                }

                // ### Add pending when overlineOffset/thickness changes to minimize number of
                // nodes
                if (!pendingStrikeOuts.isEmpty()) {
                    addTextDecorations(pendingStrikeOuts, strikeOutOffset, strikeOutThickness);

                    pendingStrikeOuts.clear();

                    strikeOutOffset = 0.0;
                    strikeOutThickness = 0.0;
                }

                // Merge current values with previous. Prefer greatest thickness
                QRawFont rawFont = node->glyphRun.rawFont();
                if (node->decorations & QQuickTextNode::Underline) {
                    if (rawFont.lineThickness() > underlineThickness) {
                        underlineThickness = rawFont.lineThickness();
                        underlineOffset = rawFont.underlinePosition();
                    }
                }

                if (node->decorations & QQuickTextNode::Overline) {
                    overlineOffset = -rawFont.ascent();
                    overlineThickness = rawFont.lineThickness();
                }

                if (node->decorations & QQuickTextNode::StrikeOut) {
                    strikeOutThickness = rawFont.lineThickness();
                    strikeOutOffset = rawFont.ascent() / -3.0;
                }

                currentDecorations = node->decorations;
                lastColor = node->color;
                lastBackgroundColor = node->backgroundColor;
                m_processedNodes.append(*node);
            }
        }

        if (!pendingUnderlines.isEmpty())
            addTextDecorations(pendingUnderlines, underlineOffset, underlineThickness);

        if (!pendingOverlines.isEmpty())
            addTextDecorations(pendingOverlines, overlineOffset, overlineThickness);

        if (!pendingStrikeOuts.isEmpty())
            addTextDecorations(pendingStrikeOuts, strikeOutOffset, strikeOutThickness);
    }

    m_currentLineTree.clear();
    m_currentLine = QTextLine();
    m_hasSelection = false;
}