CODEWITHSUNDEEP
pythonpyqtpyqt5spyder
eric
eric

Reputation: 8029

How to show a dialog all by itself (without parent widget) in PyQt?

In the context of a parent class like a main window, it is easy to pop up a dialog like a message box:

QMessageBox.information(self, "Title", "Here is your informative message")

This pops up the message I want, with parent being self, the widget already open. But what if I want to show such a dialog in the middle of a Python program all by itself (say, to tell them their program has finished running, or whatever), without invoking a parent class?

I tried the following, and the dialog shows, but when I click OK my system hangs for a few seconds, no message is printed, and my Python kernel restarts (with no error message):

import sys
from PyQt5.QtWidgets import QApplication, QMessageBox

app = QApplication(sys.argv)
mess = QMessageBox()
mess.setText("Here is your message")
mess.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
returnValue = mess.exec_()
if returnValue == QMessageBox.Ok:
    print("Clicked OK!")
elif returnValue == QMessageBox.Cancel:
    print("Cancelled?!")
print("\n\nNow we are done")

When I click Cancel, it seems to work fine. I am not sure what Qt rules I am breaking here. I could just roll my own little popup using a QWidget I suppose.

I am in pyqt5/python 3.7 running in Spyder/iPython. When I run directly from the command line, it actually seems to work, so this could be an iPython or Spyder problem.

Upvotes: 2

Views: 3003

Answers (2)

eric
eric

Reputation: 8029

The above code was only "broken" when using Spyder, and now works for newer versions of Spyder (versions 4.1+). So it wasn't a PyQt issue at all, ultimately, but an IDE interaction effect.

Upvotes: 1

Zachary Taylor
Zachary Taylor

Reputation: 183

Simply replacing self with None seems to display the QMessageBox in the middle of the screen.

QMessageBox.information(None, "Title", "Here is your informative message")

Upvotes: 2

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