我的画图项目需要读写自定义虚线样式

{
    ...
    comboBox_penStyle = new QComboBox;
    QStringList SL_penStyle;
    SL_penStyle << "______" << "----------" << ".........." << "-.-.-.-.-." << "-..-..-..-.." << settings.value("DashPattern", "5,5").toString();
    comboBox_penStyle->addItems(SL_penStyle);
    ui->mainToolBar->addWidget(comboBox_penStyle);
    connect(comboBox_penStyle, SIGNAL(currentIndexChanged(int)), this, SLOT(comboBox_penStyle_changed(int)));
    ...
}

void MainWindow::comboBox_penStyle_changed(int index)
{
    Qt::PenStyle ps = static_cast<Qt::PenStyle>(index + 1);
    imageWidget->pen.setStyle(ps);
    if (ps == Qt::CustomDashLine) {
        QStringList SL = comboBox_penStyle->itemText(index).split(",");
        QVector<qreal> pattern;
        for (QString s: SL)
            pattern << s.toInt();
        imageWidget->pen.setDashPattern(pattern);
    }
}

void MainWindow::on_action_dashPattern_triggered()
{
    QDialog *dialog = new QDialog(this);
    dialog->setWindowTitle("虚线样式");
    dialog->setFixedSize(200, 100);
    QVBoxLayout *vbox = new QVBoxLayout;
    QString s = settings.value("DashPattern", "5,5").toString();
    QLineEdit *lineEdit = new QLineEdit;
    lineEdit->setText(s);
    vbox->addWidget(lineEdit);
    QPushButton *pushButton_confirm = new QPushButton("确定");
    QPushButton *pushButton_cancel = new QPushButton("取消");
    QHBoxLayout *hbox = new QHBoxLayout;
    hbox->addStretch();
    hbox->addWidget(pushButton_confirm);
    hbox->addWidget(pushButton_cancel);
    hbox->addStretch();
    vbox->addLayout(hbox);
    dialog->setLayout(vbox);
    connect(pushButton_confirm, SIGNAL(clicked()), dialog, SLOT(accept()));
    connect(pushButton_cancel, SIGNAL(clicked()), dialog, SLOT(reject()));
    if (dialog->exec() == QDialog::Accepted) {
        settings.setValue("DashPattern", lineEdit->text());
        comboBox_penStyle->setItemText(5, lineEdit->text());
        QStringList SL = lineEdit->text().split(",");
        QVector<qreal> pattern;
        for (QString s: SL)
            pattern << s.toInt();
        imageWidget->pen.setDashPattern(pattern);
    }
}

GitLink | 确实开源