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| #!/usr/bin/env python
# -*- coding: UTF-8 -*-
#
# class myvar for jlg_47
# http://www.developpez.net/forums/d915461/autres-langages/python-zope/general-python/crash-aleatoire-thread/
# Based on Tkinter variable class
class myvar:
_default = ""
def __init__(self, master=None, value=None, name=None, trace=None, mode=None):
if not master:
master = self
self._master = master
if name:
self._name = name
else:
self._name = None
if value is not None:
self._value=value
else:
self._value=self._default
if trace:
self._trace=trace
else:
self._trace=None
if mode:
self._mode=mode
else:
self._mode=None
self._oldmode=None
self._oldtrace=None
def __str__(self):
return str(self._name)
def set(self, value):
self._value=value
if self._trace is not None and (self._mode == 'u' or self._mode == 'w'):
self.savetrace()
self._oldtrace()
elif self._oldtrace is not None:
self.restauretrace()
def get(self):
if self._trace is not None and (self._mode == 'u' or self._mode == 'r'):
self.savetrace()
self._oldtrace()
elif self._oldtrace is not None:
self.restauretrace()
return self._value
def trace_variable(self, mode, callback):
self._mode=mode
self._trace=callback
trace = trace_variable
def trace_vdelete(self):
self._mode=None
self._trace=None
def trace_vinfo(self):
return self._mode, self._trace
def varinfo(self):
return "Master", self._master, "Name", self._name, "Value", str(self._value), "Trace callback", self._trace, "Trace mode", self._mode
# TODO For callback recursion
def restauretrace(self):
self._trace=self._oldtrace
self._mode=self._oldmode
self._oldtrace=None
self._oldmode=None
def savetrace(self):
self._oldtrace=self._trace
self._oldmode=self._mode
self._trace=None
self._mode=None
if __name__ == "__main__":
a=myvar()
# Default value = ""
print a.get()
# Set a value
a.set(10)
# Get the value
print a.get()
# trace value
def callback():
# Please, don't use multiples get()/set() whith callback
print 'a in callback', a.get()
# a.set(30)
a.trace('u', callback)
a.set(20)
print 'a after callback'
print a.get()
# Callback informations
print 'Callback informations', a.trace_vinfo()
# Name
b=myvar(name='b')
print 'b name', b
# Variable informations
print 'Variable informations'
dir(b)
print b.varinfo()
# Delete callback
a.trace_vdelete()
print a.trace_vinfo() |
