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Add trace methods to class Variable

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This commit is contained in:
Guido van Rossum 1998-01-14 16:44:34 +00:00
parent f473cb007b
commit e2c6e203c6
1 changed files with 15 additions and 5 deletions
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20
Lib/lib-tk/Tkinter.py
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@ -63,12 +63,11 @@ _varnum = 0
class Variable:
_default = ""
def __init__(self, master=None):
global _default_root
global _varnum
if master:
self._tk = master.tk
else:
self._tk = _default_root.tk
if not master:
master = _default_root
self._master = master
self._tk = master.tk
self._name = 'PY_VAR' + `_varnum`
_varnum = _varnum + 1
self.set(self._default)
@ -78,6 +77,17 @@ class Variable:
return self._name
def set(self, value):
return self._tk.globalsetvar(self._name, value)
def trace_variable(self, mode, callback):
cbname = self._master._register(callback)
self._tk.call("trace", "variable", self._name, mode, cbname)
return cbname
trace = trace_variable
def trace_vdelete(self, mode, cbname):
self._tk.call("trace", "vdelete", self._name, mode, cbname)
self._tk.deletecommand(cbname)
def trace_vinfo(self):
return map(self._tk.split, self._tk.splitlist(
self._tk.call("trace", "vinfo", self._name)))
class StringVar(Variable):
_default = ""