Qt信号和插槽传递数据

FloG 发表于 Dev

鞭打

我刚来c++ and qt。我不确定我是否使用正确的术语来描述我想要实现的目标。但是，它去了。

我的应用程序spawns and removes widgets in a gridlayout当用户pushes buttons。成功地做到了这一点。但是，当用户使用生成的窗口小部件时，我需要widgets to interact with each other。

QList<QLineEdit*> m_ptrLEPathList;
QList<QPushButton*> m_ptrPBList;

qint8 m_noFields;

void MainWindow::on_pbIncFields_clicked()
{
    //create widgets and place on a new row in a gridLayout
    QLineEdit *lineEditPath = new QLineEdit(this);
    QPushButton *pushButton = new QPushButton(this);

    //storing pointers in lists to be able to delete them later.
    m_ptrLEPathList.append(lineEditPath);
    m_ptrPBList.append(pushButton);

    ui->gridLayout->addWidget(m_ptrLEPathList.last(),m_noFields,0);
    ui->gridLayout->addWidget(m_ptrPBList.last(),m_noFields,1);

    connect(m_ptrPBList.last(), SIGNAL(clicked(bool), this, SLOT(on_addPath()));
    m_noFields++;
}

void MainWindow::on_pbDecFields()
{
    //delete last spawned widgets
}

void MainWindow::on_addPath()
{
    QFileDialog getPath();
    getPath.exec();

    //somehow set the text of the line edit spawned on the same row as the pushbutton

}

因此，当我按下任何生成的按钮时，我的插槽就会执行，但我不知道如何执行store the data from the file dialog in the related lineEdit。

是我要做什么的基本想法，还是有其他解决方案可以实现我想要的功能？

在on_addPath插槽中，您可以使用QObject::sender方法获得单击的按钮，并且假设m_ptrLEPathList和m_ptrPBList列表相等，则可以轻松获得相应的内容QLineEdit：

void MainWindow::on_addPath()
{
    QFileDialog dialog;
    if (!dialog.exec())
    {
        return;
    }

    QStringList fileNames = dialog.selectedFiles();
    if (fileNames.isEmpty())
    {
        return;
    }

    QPushButton *btn = qobject_cast<QPushButton*>(sender());
    if (!btn)
    {
        return;
    }

    Q_ASSERT(m_ptrPBList.size() == m_ptrLEPathList.size());

    int index = m_ptrPBList.indexOf(btn);
    if (index == -1)
    {
        return;
    }

    QLineEdit *edit = m_ptrLEPathList.at(index);
    edit->setText(fileNames.first());
}