CODEWITHSUNDEEP
pythonpyqtpyqt4
Driedan
Driedan

Reputation: 275

Update QWidget every minutes

Is their a way possible to update a Qwidget in PyQT4 every 15 minutes ? I know their is something like a Qtimer but is it also possible to make a QWidget update itself at a specific time,for example 00h00 00h15 00h30 00h45 01h00,... . So is their a way to make the Qtimer depend on the time?

Upvotes: 1

Views: 2737

Answers (1)

Andy
Andy

Reputation: 50540

The QTimer class has a setInterval method. You can utilize this to change the wait time on the fly. As a short example, this block of code will show the current second. However, if the second is a multiple of 10 it will wait 5 seconds before starting again:

import sys
from PyQt4 import QtGui, QtCore
from time import strftime

class Main(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.initUI()

    def initUI(self):
        self.timer = QtCore.QTimer(self)
        self.timer.timeout.connect(self.Time)
        self.timer.start(1000)
        self.lcd = QtGui.QLCDNumber(self)
        self.lcd.display(strftime("%S"))
        self.setCentralWidget(self.lcd)
        self.setGeometry(300,300,250,100)

    def Time(self):
        if int(strftime("%S")) % 10 == 0:
            self.timer.setInterval(5000)
        else:
            self.timer.setInterval(1000)
        self.lcd.display(strftime("%S"))

def main():
    app = QtGui.QApplication(sys.argv)
    main = Main()
    main.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

(This was modified slightly from a tutorial showing how to build a digital clock)

It looks like this for 4 consecutive changes of the display:

Seconds

For your particular problem, when you start the application, you can find how long it is until the next quarter hour via a function like is presented in this answer: 

def next_quarter_hour(self):
    dt = datetime.datetime.now()
    nsecs = dt.minute*60+dt.second+dt.microsecond*1e-6  
    delta = (nsecs//900)*900+900-nsecs
    return delta * 1000.0

This would change the following:

def initUI(self):
    ...
    self.timer.start(next_qt_hour)
    ...

def Time(self):
    if int(strftime("%M")) % 15 == 0:
        self.timer.setInterval(900000)
    self.lcd.display(strftime("%M"))

Use this to set your first interval. Then once that timer has been exhausted, reset your interval to 15 minutes.

Upvotes: 3

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