Qt Font 设置粗体 斜体 下划线 字体颜色

void Widget::on_actFontBold_triggered(bool checked)
{
    QTextCharFormat fmt;
    fmt = ui->txtEdit->currentCharFormat();
    if(checked)
        fmt.setFontWeight(QFont::Bold);
    else
        fmt.setFontWeight(QFont::Normal);

    ui->txtEdit->mergeCurrentCharFormat(fmt);
}

void Widget::on_actFontItalic_triggered(bool checked)
{
    ui->txtEdit->setFontItalic(checked);
    ui->txtEdit->setFocus();
}

void Widget::on_actFontUnderline_triggered(bool checked)
{
    ui->txtEdit->setFontUnderline(checked);
    ui->txtEdit->setFocus();
}

void Widget::on_actFont_triggered()
{//设置字体颜色
    QColor color = QColorDialog::getColor(color, this);
    if(color.isValid())
    {
        ui->txtEdit->setTextColor(color);
        ui->txtEdit->setFocus();
    }
}