设置QTextEdit文本格式

//设置选中的文本的颜色
    QColor color = QColorDialog::getColor(Qt::black, this, "Select Color", QColorDialog::DontUseNativeDialog);
    if(color.isValid())
    {
        ui->doc->setTextColor(color);
    }
//设置选中整个编辑区域的背景色
    QColor color = QColorDialog::getColor(Qt::white, this, "Select Color", QColorDialog::DontUseNativeDialog);
    if(color.isValid())
    {
        QString tmp("QTextEdit {background-color:");
        tmp += color.name();
        tmp += QString(";}");
        ui->doc->setStyleSheet(tmp);
        ui->doc->setTextBackgroundColor(color);
    }
//设置选中的文本的背景色
    QColor color = QColorDialog::getColor(Qt::white, this, "Select Color", QColorDialog::DontUseNativeDialog);
    if(color.isValid())
    {
        ui->doc->setTextBackgroundColor(color);
    }
//设置选中的文本的字体
    bool ok;
    QFont font = QFontDialog::getFont(&ok, this);
    if (ok)
    {
        QTextCursor cur = ui->doc->textCursor();
        QString sltStr = cur.selectedText();
        ui->doc->cut();
        QTextCharFormat fmtText;
        fmtText.setFont(font);
        cur.insertText(sltStr,fmtText);
    }