How to use the '?' on a QDialog window tile bar?

Question

With a window generated by a QDialog with QT Designer there is a '?' button on the window title bar. How do you connect this button to a html file that displays help information? I expected that there would be an object within QT Designer that references the '?' button, but, I can't locate it.

Answer 1

I do not understand why you want to use the button, but if you want to detect the click event and assuming you are in Windows then a possible solution is to use the nativeEvent() method since that element depends on each platform:

import ctypes.wintypes
import win32con
from  PyQt5 import QtWidgets


class Dialog(QtWidgets.QDialog):
    def nativeEvent(self, eventType, message):
        msg = ctypes.wintypes.MSG.from_address(message.__int__())
        if eventType == "windows_generic_MSG":
            if msg.message == win32con.WM_NCLBUTTONDOWN:
                print("Hello World")
        return super(Dialog, self).nativeEvent(eventType, message)


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Dialog()
    w.exec_()