C++ - QListWidget select first item

问题

In my QMainWindow Constructor I read a database and fill my QListWidget with the items. Apparently there is no item selected so I have to do it on my own. I also have a slot which will be called when I click on an item in the list.

I tried setCurrentRow( const int ) but if I do so the slot won't be called. I've seen the function setCurrentIndex( const QModelIndex & ) but I'm not familiar with the QModelIndex.

How do I tell my QListWidget to select the first item and call the on_list_clicked(const QModelIndex& index) slot?

Edit: Also, I cannot use any other slot than clicked because currentRowChanged(int) and itemSelectionChanged() both make my program crash when I remove a certain index from the list.

So somehow I need to perform a click on the list...

回答1:

Calling setCurrentRow() emits the signal currentRowChanged(), which accepts an int instead of a QModelIndex.

Simply connect to that signal instead of to itemSelectionChanged().

Sample code:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->listWidget->setCurrentRow(1);
}

void MainWindow::on_listWidget_currentRowChanged(int currentRow)
{
    qDebug() << currentRow;
}

来源：https://stackoverflow.com/questions/18596260/c-qlistwidget-select-first-item