Python QDateEdit increment

Question

I'm using a QDateEdit control in a GUI in Python. I want to control it just by using keyboard, so when I press the up arrow key it changes from 31-jan-2000 to 01-feb-2000, by instance.

Currently, it just changes year, month and day independiently, but I want to change it like a block, increasing by calendar days.

In the gif, you could see the behavior of the control, I changed day, month and year independently, but I couldn't change it as a "whole date".

Thanks in advance.

Answer 1

It is possible override the default behaviour by reimplementing stepBy :

class DateEdit(QtGui.QDateEdit):    
    def stepBy(self, steps):
        self.setDateTime(self.dateTime().addDays(steps)) 

However, this doesn't quite work perfectly, because the cursor must be in the year section to get continuous increments. If it's in the month section , it will only increment through all months/days in the year; and if it's in the day section , it will only increment through all days in the month. Personally, I think I would treat this as a "feature", and leave it at that (since the implementaion is so simple).

You could try to force the cursor to stay in the year section , but that would prevent manual editing, which significantly reduces usability. However, I suppose you could use the calendar-popup to provide manual editing, and then make the line-edit read-only:

class DateEdit(QtGui.QDateEdit):
    def __init__(self, *args, **kwargs):
        super(DateEdit, self).__init__(*args, **kwargs)
        self.setCalendarPopup(True)
        edit = self.lineEdit()
        edit.setReadOnly(True)
        edit.selectionChanged.connect(lambda edit=edit: edit.end(False))

    def stepBy(self, steps):
        self.setDateTime(self.dateTime().addDays(steps))