Thomas Perl wrote:
> Ohai!
>
> 2011/1/17 Fars- mo :
> > Wouldn't it be plain beauty to be able to write a one-line hello world?
> >
> > with QtGui.QApplication: QtGui.QLabel("Hello world!").show()
>
> The one-liner wouldn't work, because the QLabel will be destroyed
> after show() was called (because it drops out of context - you have to
> keep a reference to it for it to stay alive).I forgot to mention this in the mailing list, but I recently found out that all the enhancements in this thread are dependent on the fact that this behavior gets changed. I filed this as a bug, although because it's controversial and a pretty big change it will likely become a PSEP: http://bugs.openbossa.org/show_bug.cgi?id=619 > This can be done with a simple context manager, actually: > > ============ > from contextlib import contextmanager > import sys > > from PySide.QtGui import * > > @contextmanager > def QtApp(): > app = QApplication(sys.argv) > yield app > sys.exit(app.exec_()) > ============ > > Usage: > > with QtApp(): > l = QLabel("Hello world!") > l.show() > > Or also with access to the QApplication object should the need arise: > > with QtApp() as app: > w = QMainWindow() > w.setWindowTitle('blubb') > pb = QPushButton('heya') > pb.clicked.connect(lambda: app.exit(2)) > w.setCentralWidget(pb) > w.show() No, your examples would fall prey to the same issue as the one-liner because if I'm not mistaken, l and w would have ended their lifetimes when the context manager's __exit__ is called. Cheers, Farsmo _______________________________________________ PySide mailing list PySide@lists.openbossa.org http://lists.openbossa.org/listinfo/pyside
