Associating arguments to an event-handler function
from Tkinter import *
class curry:
"""from Scott David Daniels'recipe
"curry -- associating parameters with a function"
in the "Python Cookbook"
http://aspn.activestate.com/ASPN/Python/Cookbook/
"""
def __init__(self, fun, *args, **kwargs):
self.fun = fun
self.pending = args[:]
self.kwargs = kwargs.copy()
def __call__(self, *args, **kwargs):
if kwargs and self.kwargs:
kw = self.kwargs.copy()
kw.update(kwargs)
else:
kw = kwargs or self.kwargs
return self.fun(*(self.pending + args), **kw)
def event_lambda(f, *args, **kwds ):
"""A helper function that wraps lambda in a prettier interface.
Thanks to Chad Netzer for the code."""
return lambda event, f=f, args=args, kwds=kwds : f( *args, **kwds )
# ---------- code for function: event_lambda (end) -----------
class MyApp:
def __init__(self, parent):
self.myParent = parent
self.myContainer1 = Frame(parent)
self.myContainer1.pack()
button_name = "OK"
# command binding -- using curry
self.button1 = Button(self.myContainer1,
command = curry(self.buttonHandler, button_name, 1, "Good stuff!"))
# event binding -- using the event_lambda helper function
self.button1.bind("<Return>",
event_lambda( self.buttonHandler, button_name, 1, "Good stuff!" ) )
self.button1.configure(text=button_name, background="green")
self.button1.pack(side=LEFT)
self.button1.focus_force() # Put keyboard focus on button1
button_name = "Cancel"
# command binding -- using curry
self.button2 = Button(self.myContainer1,
command = curry(self.buttonHandler, button_name, 2, "Bad stuff!"))
# event binding -- using the event_lambda helper function in two steps
event_handler = event_lambda( self.buttonHandler, button_name, 2, "Bad stuff!" )
self.button2.bind("<Return>", event_handler )
self.button2.configure(text=button_name, background="red")
self.button2.pack(side=LEFT)
def buttonHandler(self, argument1, argument2, argument3):
print " buttonHandler routine received arguments:", \
argument1.ljust(8), argument2, argument3
def buttonHandler_a(self, event, argument1, argument2, argument3):
print "buttonHandler_a received event", event
self.buttonHandler(argument1, argument2, argument3)
root = Tk()
myapp = MyApp(root)
root.mainloop()
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