Mastering GUI Programming with Python

Using a custom delegate

The reviews table contains a column with a date; while we can certainly edit dates using a regular QLineEdit, it would be nicer if we could use the more appropriate QDateEdit widget. Unlike the situation with our coffee list view, Qt doesn't have a ready-made delegate that will do this for us. Fortunately, we can easily create our own delegate:

1. Above the CoffeeForm class, let's define a new delegate class:

class DateDelegate(qtw.QStyledItemDelegate):    def createEditor(self, parent, option, proxyModelIndex):        date_inp = qtw.QDateEdit(parent, calendarPopup=True)        return date_inp

The delegate class inherits QStyledItemDelegate, and its createEditor() method is responsible for returning the widget that will be used for ...