在另一個qdialog中更改Qlistview索引時，如何更改qlineedit的文本？

Question

嗨，當我單擊Qdialog中的按鈕時，我想在主窗口中獲取QListView的文本字符串。 我的實現是：

在Qdialog中

void hist::getValue(){
    QModelIndexList templatelist =
        ui->listView->selectionModel()->selectedIndexes();
    QStringList stringlist;
    foreach (const QModelIndex &index, templatelist) {
      stringlist.append(index.data(Qt::DisplayRole).toString());
    }
    qDebug()<<stringlist;
    // return stringlist;   // what i need to here to return stringlist ?
}

void hist::on_downloadselected_clicked() {

    connect(ui->downloadselected, SIGNAL(clicked()), SLOT(accept()));

    // TODO selected download
}

在主窗口中

void mainwindow::on_pushButton_2_clicked()
{
    hist history;
    history.exec();
    if( history.exec() == QDialog::Accepted ){
       QString damn = history.getValue();  // am getting error here 
       ui->url->setText(damn);
       qDebug()<<"pressed";
    }
}

Answer 1

您的編譯錯誤當然是因為您的方法返回了void ，並且您仍然嘗試使用其返回值。 您可能需要類似未經測試的代碼：

// changed to return first selection, or empty QString if no selection
QString hist::getValue(){
    QModelIndexList templatelist =
        ui->listView->selectionModel()->selectedIndexes();
    if (templatelist.isEmpty()) 
        return QString(); // empty string
    else 
        return templatelist.first().data(Qt::DisplayRole).toString();t ?
}

void hist::on_downloadselected_clicked() {
    // why did you even have connect here?
    if (!getValue().isEmpty())
        accept(); // close the dialog with accept if selection made
    else
        reject(); // or do nothing?
}

Answer 2

解決了主窗口中特定文件中以下代碼的問題

void mainwindow::on_pushButton_2_clicked()
{
hist history;
// history.exec();
if( history.exec() == QDialog::Accepted){
ui->url->setText(history.inputstring());
on_downloadButton_clicked();
}
else if( history.close() == QDialog::Rejected ) {
    history.close();
}
}

在對話框中

QString hist::inputstring() {

QModelIndexList templatelist =
ui->listView->selectionModel()->selectedIndexes();
QString  stringlist;
foreach (const QModelIndex &index, templatelist) {
stringlist.append(index.data(Qt::DisplayRole).toString());
}
return stringlist;
}