Python C++ Template Equivalent

[deanhystad]

I tried a mixin. It works, but the mixin provides only half the additional functionality because it really needs to act like a QWidget to get the show/close events.

class BaseView():
    """Abstract base class for views"""
    def __init__(self):
       self.update_list = UpdateList(1.0)

    def upload(self):
        """Forward update message to all ValueControl objects"""
        if self.isVisible():
            for child in self.children():
                if isinstance(child, ValueControl):
                    child.update_value()


class View(QtWidgets.QWidget, BaseView):
    """Add upload and update loop to QWidget"""

    def __init__(self, *args, **kwargs):
        QtWidgets.QWidget.__init__(self, *args, **kwargs)
        BaseView.__init__(self)

    def showEvent(self, event):
        """Start update loop when window is shown"""
        self.upload()
        self.update_list.start()
        event.accept()

    def closeEvent(self, event):
        """Stop update loop when window is closed"""
        self.update_list.stop()
        event.accept()

A benefit of this approach is giving View and GroupView a common superclass makes them easier to find using methods like QtWidget.findChildren(BaseView).