QListWidgetItem storing a multi value field

WhatIf

I have a QListWidget that I add QListWidgetItem(s) to and remove from. The problem I'm trying to find a solution to is each QListWidgetItem adds a QString to the QListWidget. I still want it to do that but also add and ID associated with each QString in the background. So that if I want to delete any QString from the QListWidget, its associated ID is deleted as well.

I thought about adding std::map, storing ID and string in it before adding the QString to the QListWidget but if I add similar QString, how would I know which QString is associate with which ID to remove?

Is there an easier solution?

mrjj

Hi
Something like this ?
http://stackoverflow.com/questions/7136818/can-i-store-some-user-data-in-every-item-of-a-qlistwidget
You could store an ID for your map.

Its a QVariant so you can also use your own type/class/struct if you register it,
http://stackoverflow.com/questions/24362946/how-can-i-cast-a-qvariant-to-custom-class
Q_DECLARE_METATYPE(CustomType) part.

WhatIf

I modified the code in the link you provided. The code is working fine but occasionally I'm getting segmentation fault and the app terminates. Here is my code:

        QListWidgetItem* lineItem = new QListWidgetItem(name, ui->listWidget);
        lineItem->setData(Qt::UserRole, ID);
        lineItem->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable );
        lineItem->setCheckState(Qt::Unchecked);
        ui->listWidget->addItem(lineItem);

Will using a parent ( ui->listWidget) in the QListWidgetItem cause problems?

to retrieve ID, I use the following code:

    for(int i = 0; i < ui->listWidget->count(); ++i)
    {
        QListWidgetItem* currentItem = ui->listWidget->item(i); 
        if (currentItem != 0) {
             QVariant id = currentItem->data(Qt::UserRole);
             saveID(id.toString());
          }
     }

The code compiles and run but will it cause program failure?

SGaist

Hi,

What does a run through the debugger tell you about that crash ?