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python-3.xgtkpygobject

Is there a better way to handle double click in pygobject

I've been using the following for handling double click:

    def do_button_press_event(self, eb: Gdk.EventButton):
    if eb.type == Gdk.EventType._2BUTTON_PRESS:
        # todo: code double click
        pass

Accessing the private property _2BUTTON_PRESS feels a bit dirty. Is there a better way to handle this?

Solution

  • It's not a private property: it's an artefact of the C enumeration member being GDK_2BUTTON_PRESS. Python does not allow identifiers to start with a number, so when translating the symbol GDK_2BUTTON_PRESS in the GdkEventType C enumeration into a field in Gdk.EventType Python class, PyGOBject needs to escape the 2BUTTON_PRESS part.

    To avoid this, GTK introduced a GDK_DOUBLE_BUTTON_PRESS, which is correctly translated as Gdk.EventType.DOUBLE_BUTTON_PRESS.

    The same explanation also applies to the GDK_3BUTTON_PRESS/GDK_TRIPLE_BUTTON_PRESS enumeration fields.