mouse wheel event and QListWidget: wrong behaviour?

[jho]

Hi,
i have three QListWidgets: FileList, DateList and Filesize.

When I scroll inside my FileList, I want that the DateList and Filesize scrolls to the same position like the FileList.

I have a function for the wheelevent. Inside I have this code:

QScrollBar *vb = ui->listWidget->verticalScrollBar();
        int v = vb->value();
 
        QScrollBar *vbDate = ui->listWidgetDate->verticalScrollBar();
        vbDate->setValue(v);
 
        QScrollBar *vbSize = ui->listWidgetSize->verticalScrollBar();
        vbSize->setValue(v);

QScrollBar *vb = ui->listWidget->verticalScrollBar();
        int v = vb->value();

        QScrollBar *vbDate = ui->listWidgetDate->verticalScrollBar();
        vbDate->setValue(v);

        QScrollBar *vbSize = ui->listWidgetSize->verticalScrollBar();
        vbSize->setValue(v);

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The strange thing is that the mouse delta only changes when i reached the end of the list. Or the top of the list. And then the position of the other two lists changes.

To say it in other words: Outside of the listwidget every mouse wheel turn is recognized but inside the list widget I have to scroll down to the end or to the top.