In article <4acca070.3050...@codebykevin.com>,
Kevin Walzer <k...@codebykevin.com> wrote:
>...
> My question is this: how can I get Python callbacks to fire when a raw
> Tk widget is being called via 'self.tk.call'? Do I have to write a fancy
> wrapper that turns the widget into a Python object that will respond to
> Python callbacks, or is there a simpler way to do this?
I use this class (from the RO package's module RO.TkUtil):
class TclFunc:
"""Register a python function as a tcl function.
Based on Tkinter's _register method (which, being private,
I prefer not to use explicitly).
If the function call fails, a traceback is printed.
Please call deregister when you no longer
want the tcl function to exist.
"""
tkApp = None
def __init__(self, func, debug=False):
if self.tkApp == None:
self.tkApp =Tkinter.Frame().tk
self.func = func
self.tclFuncName = "pyfunc%s" % (id(self),)
self.debug = bool(debug)
try:
self.tclFuncName += str(func.__name__)
except AttributeError:
pass
if self.debug:
print "registering tcl function %s for python function %s" %
(self.tclFuncName, func)
self.tkApp.createcommand(self.tclFuncName, self)
def __call__(self, *args):
try:
self.func(*args)
except (SystemExit, KeyboardInterrupt):
raise
except Exception, e:
sys.stderr.write("tcl function %s failed: %s\n" %
(self.tclFuncName, e))
traceback.print_exc(file=sys.stderr)
def deregister(self):
"""Deregister callback and delete reference to python function.
Safe to call if already deregistered.
"""
if self.debug:
print "%r.deregister()" % (self,)
if not self.func:
if self.debug:
print "already deregistered"
return
try:
self.tkApp.deletecommand(self.tclFuncName)
except Tkinter.TclError, e:
if self.debug:
print "deregistering failed: %r" % (e,)
pass
self.func = None
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, self.tclFuncName)
def __str__(self):
return self.tclFuncName
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