Pyqt5 rapid development and practice 4.12 calendar and time

PyQt5 Rapid development and actual combat

4. The first 4 Chapter PyQt5 Basic window control

4.12 Calendar and time

4.12.1 QCalendar

QCalendar Is a calendar control , It provides a month based view , Allows the user to select a date through the mouse or keyboard , Today's date is selected by default . You can also specify the date range of the calendar .

QCalendar Common methods in class

Method	describe
setDataRange()	Set the date range for selection
setFirstDayOfWeek()	Reset the first day of the week , The default is Sunday . The parameter enumeration values are as follows :Qt.Monday, Monday ;Qt.Tuesday, Tuesday ;Qt.Wednesday, Wednesday ;Qt.Thursday, Thursday ;Qt.Friday, Friday ;Qt.Saturday, Saturday ;Qt.Sunday, Sunday
setMinimumDate()	Set minimum date
setMaximumDate()	Set the maximum date
setSelectedDate()	Set up a QDate object , The date selected as the date control
maximumDate	Get the maximum date of the calendar control
minimumDate	Get the minimum date of the calendar control
selectedDate()	Returns the currently selected date
setGridvisible()	Sets whether the calendar control displays a grid

Case study ——QCalendar Use

import sys
from PyQt5 import QtCore
from PyQt5.QtWidgets import *
from PyQt5.QtCore import QDate

class CalendarExample(QWidget):
    def __init__(self):
        super(CalendarExample, self).__init__()
        self.initUI()

    def initUI(self):
        self.cal = QCalendarWidget(self)
        self.cal.setMinimumDate(QDate(1980 , 1, 1))
        self.cal.setMaximumDate(QDate(3000 , 1, 1,))
        self.cal.setGridVisible(True)
        self.cal.move(20 , 20)
        self.cal.clicked[QtCore.QDate].connect(self.showDate)
        self.lb1 = QLabel(self)
        date = self.cal.selectedDate()
        self.lb1.setText(date.toString("yyyy-MM-dd dddd"))
        self.lb1.move(20 , 300)
        self.setGeometry(100 , 100 , 400 , 350)
        self.setWindowTitle("Calendar Case study ")

    def showDate(self,date):
        self.lb1.setText(date.toString("yyyy-MM-dd dddd"))

if __name__ == '__main__':
    from pyqt5_plugins.examples.exampleqmlitem import QtCore
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    app = QApplication(sys.argv)
    win = CalendarExample()
    win.show()
    sys.exit(app.exec_())

4.12.2 QDateTimeEdit

QDateTimeEdit Is a control that allows users to edit date and time , You can use the keyboard and 、 Use the down arrow button to increase or decrease the date time value . such as , When using the mouse to select QDateTimeEdit The year in , You can use the on the keyboard 、 Press the key to change the value .

ODateTimeEdit adopt setDisplavFormat() Function to set the displayed date and time format .

QDateTimeEdit Common methods in class .

Method	describe
setDisplayFormat()	Format date and time : yyyy, Represents the year , use 4 Digit representation ;MM, Represents the month , The value range is 01~12; dd, On behalf of the day , The value range is 0131;HH, For hours , The value range is 00-23; mm, For minutes , The value range is 0059;ss, On behalf of the second , The value range is 0059;
setMinimumDate()	Set the minimum date of the control
setMaximumDate()	Set the maximum date of the control
time()	Return to the editing time
date()	Return to the edited date

QDateTimeEdit Class

The signal	meaning
dateChanged	Send this signal when the date changes
dateTimeChanged	Send this signal when the date and time change
timeChanged	Transmit this signal when time changes

• QDateTimeEdit Subclasses of

  QDateEdit and QTimeEdit Classes inherit from QDateTimeEdit class , Many of their features and functions are provided by QDateTimeEdit Class provides .

  QWidget → QAbstractSpinBox → QDateTimeEdit → QDateEdit → QTimeEdit

  Pay attention to when setting the display format :QDateEdit The date used to edit the control , Year only 、 Month and day ;QTimeEdit Time used to edit the control , Hours only 、 Minutes and seconds .

  Do not use QDateEdit To set or get the time , Don't use QTimeEdit To set or get the date . If you want to operate date and time at the same time , Use QDateTimeEdit.

  When setting the pop-up calendar, pay attention to : The only class used to pop up the calendar is QDateTimeEdit and QDateEdit, and QTimeEdit Class can set the pop-up calendar in Syntax , But it doesn't work .

• initialization QDateTimeEdit class

  By default , If QDateTimeEdit Class is constructed without specifying a date time , Then the system will set the same date and time format as the local , And the value of 2000 year 1 month 1 Japan 0 when 0 branch 0 second . You can also manually specify the date and time displayed by the control .

  In addition to specifying the displayed date and time through the constructor , It can also be based on QDateTimeEdit Provided slot function to set , such as setDate Time()、setDate()、setTime() function .

• Format date and time

  If you don't want to use the system default format , You can use the setDisplayFormat() Customize date time format .

• Set the date time range

  dateEdit = QDateTimeEdit (QDateTime.currentDateTime (),self)
  dateEdit.setDisplayFormat("yyyy-MM-dd HH:mm:ss")
  # Set minimum date 
  dateEdit.setMinimumDate (QDate.currentDate().addDays (-365))
  # Set the maximum date 
  dateEdit.setMaximumDate (QDate.currentDate().addDays (365))
  

• Pop up calendar

  By default , You can only change the date and time through the up and down arrows . If you want to pop up the calendar control , Just call setCalendarPopup(True) that will do .

• Get date time

  Can pass date()、 dateTime() And other methods to get the date time object , If you want to get years 、 month 、 Japan and other information , You can call QDate Of year()、month()、day() Such as function .

• Signal and slot function

QDateTimeEdit The commonly used signal of the control is dateChanged 、 dateTimeChanged and ·timeChanged, Change the date 、 Date time 、 Time emission .

QDateTimeEdit Use case of

import sys
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import QDate, QDateTime, QTime


class DateTimeEditDemo(QWidget):
    def __init__(self):
        super(DateTimeEditDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QDateTimeEdit Example ')
        self.resize(300, 90)

        vlayout = QVBoxLayout()
        self.dateEdit = QDateTimeEdit(QDateTime.currentDateTime(), self)
        self.dateEdit.setDisplayFormat("yyyy-MM-dd HH:mm:ss")
        #  Set minimum date 
        self.dateEdit.setMinimumDate(QDate.currentDate().addDays(-365))
        #  Set the maximum date 
        self.dateEdit.setMaximumDate(QDate.currentDate().addDays(365))
        self.dateEdit.setCalendarPopup(True)

        self.dateEdit.dateChanged.connect(self.onDateChanged)
        self.dateEdit.dateTimeChanged.connect(self.onDateTimeChanged)
        self.dateEdit.timeChanged.connect(self.onTimeChanged)

        self.btn = QPushButton(' Get the date and time ')
        self.btn.clicked.connect(self.onButtonClick)

        vlayout.addWidget(self.dateEdit)
        vlayout.addWidget(self.btn)
        self.setLayout(vlayout)

    #  Execute when the date changes 
    def onDateChanged(self, date):
        print(date)

    #  No matter the date or time changes , It will be carried out 
    def onDateTimeChanged(self, dateTime):
        print(dateTime)

    #  Execute when time changes 
    def onTimeChanged(self, time):
        print(time)

    def onButtonClick(self):
        dateTime = self.dateEdit.dateTime()
        #  Maximum date 
        maxDate = self.dateEdit.maximumDate()
        #  Maximum date time 
        maxDateTime = self.dateEdit.maximumDateTime()
        #  Maximum time 
        maxTime = self.dateEdit.maximumTime()
        #  Minimum date 
        minDate = self.dateEdit.minimumDate()
        #  Minimum date time 
        minDateTime = self.dateEdit.minimumDateTime()
        #  Minimum time 
        minTime = self.dateEdit.minimumTime()

        print('\n Choose the date and time ')
        print('dateTime=%s' % str(dateTime))
        print('maxDate=%s' % str(maxDate))
        print('maxDateTime=%s' % str(maxDateTime))
        print('maxTime=%s' % str(maxTime))
        print('minDate=%s' % str(minDate))
        print('minDateTime=%s' % str(minDateTime))
        print('minTime=%s' % str(minTime))

if __name__ == '__main__':
    from pyqt5_plugins.examples.exampleqmlitem import QtCore
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    app = QApplication(sys.argv)
    win = DateTimeEditDemo()
    win.show()
    sys.exit(app.exec_())