Qt自定义行间距

原创已于 2025-01-10 09:38:24 修改 · 357 阅读

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于 2025-01-10 09:37:51 首次发布

Qt自定义行间距

QString contentStr = "11111111111111111111111111112222222333。\n"
                         "1111111\n333333333333333333,"
                         "555555555555555。\n"
                         "6666666\n77777777777777777777777777777777777777777。";
    QFont font;
    font.setPixelSize(14);
    painter.setFont(font);
    painter.setPen(QColor("#000000"));
    QRect frame = this->rect().adjusted(10,10,-10,-10);

    QFontMetrics fontMetrics(font);
    int lineSpacing = fontMetrics.lineSpacing();
    int customLineSpacing = lineSpacing * 1.5;

    QStringList lines = contentStr.split('\n');
    int y = frame.top()+ fontMetrics.ascent();

    for (const QString &line : lines)
    {
        if (fontMetrics.width(line) <= frame.width())
        {
            painter.drawText(QPoint(frame.left(), y), line);
            y += customLineSpacing;
        }
        else
        {
            QString currentLine = "";
            for (int i = 0; i < line.length(); ++i)
            {
                QString testLine = currentLine + line[i];
                if (fontMetrics.horizontalAdvance(testLine) > frame.width())
                {
                    painter.drawText(QPoint(frame.left(), y), currentLine);
                    y += customLineSpacing;
                    currentLine = line[i];
                }
                else {
                    currentLine = testLine;
                }
                if((i == line.length()-1) && !currentLine.isEmpty())
                {
                    painter.drawText(QPoint(frame.left(), y), currentLine);
                    y += customLineSpacing;
                    break;
                }
            }
        }
    }