bruno modulix a écrit : > You may want to have a look at the Factory pattern... > > # outrageously oversimplified dummy exemple > class Gui(object): > def __init__(self, installer): > self.installer = installer > > class PosixGui(Gui): > pass > > class Win32Gui(Gui): > pass > > class GuiFactory(object): > def getGui(self, installer): > if os.name == 'posix': > return PosixGui(installer) > elif os.name == 'win32': > return Win32Gui(installer) > else: > raise "os %s not supported" % os.name > > class Installer(object): > def __init__(self, guiFactory): > self.gui = guiFactory.getGui(self) > > def main(): > inst = Installer(GuiFactory()) > return inst.gui.main() > > NB 1: > You may want to hide away the gui stuff: > > class Installer(object): > def __init__(self): > self.gui = GuiFactory().getGui(self) > > def main(self): > return self.gui.main() > > def main(): > return Installer().main() >
Thanks for this, Bruno. It is much more elegant and adaptable than my first attempt. > > NB 2 : > if it has to run in text mode, you should consider renaming "gui" to > "ui", since a CLI is not really a 'graphical' ui !-) You're right :)) > NB 3 : > I made the GuiFactory a class, but it could also be a simple function. > NB 4 : > there are of course other solutions to the problem, which may or not be > more appropriate... > Thanks a lot for these detailed explanations. -- http://mail.python.org/mailman/listinfo/python-list
