How to get all the dates displayed in a QCalendarWidget - c++

Question

I am using a QCalendarWidget in my application, and I overloaded the updateCells method to put a red background on every dates which meet certain conditions.
My problem is I don't know how to get the first date displayed in the calendar (not the first date in the month), and the last date displayed.
Example: in february, the first date displayed is january the 25th, and the last date displayed is march the 7th.
There isn't any useful method in QCalendarWidget and I can't think of an algorithm for this.
Do you have any idea how to do this ?

Answer 1

As you've got access to the currently shown month and year, you can use the QDate::dayOfWeek on the first and last date of the shown contents. Taking QCalendarWidget::firstDayOfWeek into account, you aught to be able to decide how far back and forth you have to go.

Answer 2

QCalendarWidget class is a combination of more simple widgets, you can see Qt source code for help. Just use loop to get all dates between:
class myQCalendar(QCalendarWidget):
"""custum QCalendarWidget"""
def __init__(self, parent=None):
self.table = self.findChild(QTableView)
def return_first_last_dates(self) -> Tuple[QDate, QDate]:
# first row(0) and col(0) - headers, so we use second(1,1)
first_date = self.date_by_index(
self.table.model().index(1, 1))
last_date = self.date_by_index(
self.table.model().index(6, 7))
return first_date, last_date
# self.table.model().dateForCell(1,1) didn't work in python
# maybe it will work in c++
def date_by_index(self, index: QModelIndex) -> QDate:
""" Return QDate by index of model of QTableView """
date = self.selectedDate()
day = int(index.data())
mnth = date.month() # current month always the same as current date
if day > 15 and index.row() < 3: # qcalendar always display 6 rows( and 0 - is header)
mnth = date.month() - 1
if day < 15 and index.row() > 4:
mnth = date.month() + 1
return QDate(date.year(), mnth, day)