PyQt5正确破坏程序

Question

I'm using self.setWindowFlags(Qt.Tool) to hide the application on task bar. However, I realized that even I press x on the right-top corner of the program, it's still running on the background ( I see it on task manager/processes). So that means the program doesn't close properly. Is this because I use self.setWindowFlags(Qt.Tool) ? How can I fix this, that flag option hide program's icon but even if I press x to close the program, it's still running on the background.

Answer 1

In Qt an application will continue to run until the main event loop receives the signal to exit. In most applications this is provided when the last (or only) QMainWindow is destroyed (see QApp.setQuitOnLastWindowClosed() ).

Setting the Qt.Tool flag on a QMainWindow clears the WA_QuitOnClose flag meaning that closing the window will no longer signal to exit the application. However, you can turn this flag back on as described in this post on the Qt forum .

window = QMainWindow(None, Qt.Tool)
window.show() # must be called before setting Qt::WA_QuitOnClose
window.setAttribute(Qt.WA_QuitOnClose)

Alternatively, you could also trigger the exit manually using QApp.quit() .

Answer 2

I found the solution, make your own quit button and connect the signal like below

self.xbutton = QPushButton(self)
self.xbutton.setText("Quit")
self.xbutton.clicked.connect(self.close)

This destroy the app properly. Also instead of Qt.Tool use self.setWindowFlags(QtCore.Qt.FramelessWindowHint)