将拖放连接到QListWidget中的函数的最佳方法

Question

I have a QListWidget filled with items.

The items' order is stored in a separate document class.

I can move and change the order of the items, but I would like to update the document class whenever the QListWidget order is modified through a drag&drop.

This is the abstract idea:

myListWidget::myListWidget(QWidget *parent) : QListWidget(parent)
{
    /*option*/ connect(...);
    /*option*/ setDragDropMode(QAbstractItemView::InternalMove);
}

void myListWidget::updateOrder()
{
    for(i=0; i<count(); i++) {
         ...function that updates the other class by QListWidget::item(int row)
    }
}

I have seen that there is no drop signal for the QListWidget , so I tried to associate the signal with the subclass model through:

connect(model(), SIGNAL(layoutChanged()), this, SLOT(updateOrder()));

This didn't work.

Can somebody suggest how to achieve my goal?

Answer 1

Have you tried to reimplement dropEvent in myListWidget?

http://doc.qt.io/qt-5/qlistwidget.html#dropEvent

"This event handler is called when the drag is dropped on this widget. The event is passed in the event parameter."