Mastering GUI Programming with Python

Delegates and data mapping

While we can edit the list, we can't yet add or remove items in the list; let's add that capability before we move on to the coffee form itself.

Start by creating some toolbar actions pointing to MainView methods:

        toolbar = self.addToolBar('Controls')        toolbar.addAction('Delete Coffee(s)', self.delete_coffee)        toolbar.addAction('Add Coffee', self.add_coffee)

Now we'll write the MainView methods for those actions:

    def delete_coffee(self):        selected = self.coffee_list.selectedIndexes()        for index in selected or []:            self.coffees_model.removeRow(index.row())    def add_coffee(self):        self.stack.setCurrentWidget(self.coffee_list)        self.coffees_model.insertRows(            self.coffees_model.rowCount(), 1)

To delete a row from the model, ...