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authorGuido van Rossum <guido@python.org>1998-01-14 16:44:34 (GMT)
committerGuido van Rossum <guido@python.org>1998-01-14 16:44:34 (GMT)
commite2c6e203c607f2e8791641e937f04a66bbbe8bcb (patch)
tree9ebf1f4f1a2c81491dfad9ee3ac7a1e1a0db0f5f /Lib
parentf473cb007b774cabcb712e8c4f36fbf2dae1b85d (diff)
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Add trace methods to class Variable
Diffstat (limited to 'Lib')
-rw-r--r--Lib/lib-tk/Tkinter.py20
1 files changed, 15 insertions, 5 deletions
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index fbf90e4..5220c9d 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -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 = ""