How can I give variables to the event handler?

问题

How can I give a variable to a function when I bind something? As a simple example:

def test(self):
    self.MyTextCtrl.Bind(wx.EVT_TEXT, self.something, AnyVariable)

def something(self, event, x)
    # do something
    print x

As you see, I want to give the value "AnyVariable" to the function "something" so that it will be used as the "x". How can I do this? This example doesn't work.

Edit: @ Paul McNett: Yeah, what I'm trying to do is more like:

def test(self):
    self.MyTextCtrl1.Bind(wx.EVT_TEXT, self.something, Variable1)
    self.MyTextCtrl2.Bind(wx.EVT_TEXT, self.something, Variable2)
    self.MyTextCtrl3.Bind(wx.EVT_TEXT, self.something, Variable3)

def something(self, event, x)
    # do something by including x

x=Variable1 when "MyTextCtrl1" is edited, x=Variable2 when "MyTextCtrl2" is edited and x=Variable3 when "MyTextCtrl3" is edited.

Of course I also could write 3 different functions ("def something1", "def something2", "def something3") and bind them to "MyTextCtrl1", "MyTextCtrl2" or "MyTextCtrl3". But I thought it could be much easier when I use this variable instead ;)

回答1:

One of the following approaches should do it:

Introduce a global variable (variable declaration outside the function scope at module level).

x = None
def test(self):
    self.MyTextCtrl.Bind(wx.EVT_TEXT, self.something)

def something(self, event):
    global x
    x = ... # alter variable on event

Introduce a member variable of a class.

Furthermore wx.EVTHandler suggests anything as event handler that is callable. For this case I've written a simple class to hold one value (extendable for multiple values) and that implements a __call__ method. Interfering special methods is an advanced topic, for this case I've put together example code:

import wx

class TestFrame(wx.Frame):
    def __init__(self, *args, **kwargs):
        wx.Frame.__init__(self, None, -1, *args, **kwargs)
        sizer = wx.BoxSizer(wx.VERTICAL)
        self.SetSizer(sizer)
        b = wx.Button(self, -1, "Test")
        sizer.Add(b)
        b.Bind(wx.EVT_BUTTON, TestHandler("foo"))
        self.Show()

class TestHandler:
    def __init__(self, value):
        self.value = value

    def __call__(self, event):
        print event
        print "My value is:", self.value

if __name__ == "__main__":
    app = wx.App()
    TestFrame("")
    app.MainLoop()

来源：https://stackoverflow.com/questions/12570856/how-can-i-give-variables-to-the-event-handler

标签

wxpython