Is it possible to pass arguments into event bindings?

Question

I haven\'t found an answer elsewhere and this doesn\'t appear to have been asked yet on SO.

When creating an event binding in wxPython, is it possible to pass additi

Answer 1

You can always use a lambda or another function to wrap up your method and pass another argument, not WX specific.

b = wx.Button(self, 10, "Default Button", (20, 20))
        self.Bind(wx.EVT_BUTTON, lambda event: self.OnClick(event, 'somevalue'), b)
def OnClick(self, event, somearg):
        self.log.write("Click! (%d)\n" % event.GetId())

If you're out to reduce the amount of code to type, you might also try a little automatism like:

class foo(whateverwxobject):
    def better_bind(self, type, instance, handler, *args, **kwargs):
        self.Bind(type, lambda event: handler(event, *args, **kwargs), instance)

    def __init__(self):
        self.better_bind(wx.EVT_BUTTON, b, self.OnClick, 'somevalue')

Answer 2

The nicest way would be to make a generator of event handlers, e.g.:

def getOnClick(self, additionalArgument):
    def OnClick(event):
        self.log.write("Click! (%d), arg: %s\n" 
                         % (event.GetId(), additionalArgument))
    return OnClick

Now you bind it with:

b = wx.Button(self, 10, "Default Button", (20, 20))
b.Bind(wx.EVT_BUTTON, self.getOnClick('my additional data'))