CustomListWidgetItem setData -> call itemUpdated signal

[JuanMO]

Hello,

I have a CustomListWidgetItem and override the setData for my data, but I need to let the list know when the user data is changed.
Looking into the QT code I found that in the base class ( QListWidgetItem ) a signal is sent, through the QListModel , which it is not accessible.

class CustomListWidgetItem : public QListWidgetItem
{
    ...
    void setData( int role, const QVariant & value ) 
    {
	switch(role)
	{
	case Qt::UserRole:
		item = value.value<Item>();
		UpdateDurationTimer();
		if (QListModel *model = (listWidget() ? qobject_cast<QListModel*> (listWidget()->model()) : 0))
		{
			model->itemChanged(this);  // This code is not accessible
		}
		break;
	default:
		QListWidgetItem::setData(role , value);
		break;
	}
    }
    ....
}

class CustomListWidgetItem : public QListWidgetItem
{
    ...
    void setData( int role, const QVariant & value ) 
    {
	switch(role)
	{
	case Qt::UserRole:
		item = value.value<Item>();
		UpdateDurationTimer();
		if (QListModel *model = (listWidget() ? qobject_cast<QListModel*> (listWidget()->model()) : 0))
		{
			model->itemChanged(this);  // This code is not accessible
		}
		break;
	default:
		QListWidgetItem::setData(role , value);
		break;
	}
    }
    ....
}

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Is there any elegant thing to do to emit that signal from the derived class? As walk around I could create an object and call base::setData to let the base do all the work but I don't like to duplicate unnecessary data

Thanks in advance

[pervlad]

If you need custom model/view, maybe you should reconsider using QListWidget and use QListView and QListModel instead.
In order to make custom model view development flexible there is model/view framework in Qt. It is very well documented see: Model/View Programming and An Introduction to Model/View Programming.