Ejemplo n.º 1
0
/// Calculate single line layout for given text with specified font.
/// This function automatically add ellipsis text if the naural width
/// is larger than given region.
/// \layout The result layout.
/// \font The font object.
/// \string The text needs to be layouted.
/// \align Alignment.
/// \rect The region.
/// \ellipsis Add ellipse to left or right if necessary.
/// Returns the line height.
int calculateSingleLineLayout(QTextLayout & layout,
                              const QFont & font,
                              const QString & string,
                              const Qt::Alignment align,
                              const QRect & rect,
                              const Qt::TextElideMode ellipsis)
{
    QFontMetrics fm(font);

    // Check if we need to add ellipsis.
    QString result_string = string;
    int width = ellipsisText(string, fm, rect.width(),
                             ellipsis, result_string);

    // Construct the layout.
    layout.clearLayout();
    layout.setCacheEnabled(false);
    layout.setText(result_string);
    layout.setFont(font);
    layout.beginLayout();
    QTextLine line = layout.createLine();
    if (line.isValid())
    {
        line.setLineWidth(rect.width());
    }
    layout.endLayout();

    // Calculate the position.
    int x = rect.left();
    int y = rect.top();
    int h = static_cast<int>(line.height());

    if (align & Qt::AlignHCenter)
    {
        x = ((rect.width() - width) >> 1) + x;
    }
Ejemplo n.º 2
0
void QStaticTextPrivate::paintText(const QPointF &topLeftPosition, QPainter *p)
{
    bool preferRichText = textFormat == Qt::RichText
                          || (textFormat == Qt::AutoText && Qt::mightBeRichText(text));

    if (!preferRichText) {
        QTextLayout textLayout;
        textLayout.setText(text);
        textLayout.setFont(font);
        textLayout.setTextOption(textOption);
        textLayout.setCacheEnabled(true);

        qreal leading = QFontMetricsF(font).leading();
        qreal height = -leading;

        textLayout.beginLayout();
        while (1) {
            QTextLine line = textLayout.createLine();
            if (!line.isValid())
                break;

            if (textWidth >= 0.0)
                line.setLineWidth(textWidth);
            height += leading;
            line.setPosition(QPointF(0.0, height));
            height += line.height();
        }
        textLayout.endLayout();

        actualSize = textLayout.boundingRect().size();
        textLayout.draw(p, topLeftPosition);
    } else {
        QTextDocument document;
#ifndef QT_NO_CSSPARSER
        QColor color = p->pen().color();
        document.setDefaultStyleSheet(QString::fromLatin1("body { color: #%1%2%3 }")
                                      .arg(QString::number(color.red(), 16), 2, QLatin1Char('0'))
                                      .arg(QString::number(color.green(), 16), 2, QLatin1Char('0'))
                                      .arg(QString::number(color.blue(), 16), 2, QLatin1Char('0')));
#endif
        document.setDefaultFont(font);
        document.setDocumentMargin(0.0);
#ifndef QT_NO_TEXTHTMLPARSER
        document.setHtml(text);
#else
        document.setPlainText(text);
#endif
        if (textWidth >= 0.0)
            document.setTextWidth(textWidth);
        else
            document.adjustSize();
        document.setDefaultTextOption(textOption);

        p->save();
        p->translate(topLeftPosition);
        QAbstractTextDocumentLayout::PaintContext ctx;
        ctx.palette.setColor(QPalette::Text, p->pen().color());
        document.documentLayout()->draw(p, ctx);
        p->restore();

        if (textWidth >= 0.0)
            document.adjustSize(); // Find optimal size

        actualSize = document.size();
    }
}