Update of /cvsroot/pymerase/pymerase/output/PyTkWidgets
In directory sc8-pr-cvs1:/tmp/cvs-serv9600
Added Files:
ValidatingEntry.py
Log Message:
Validating Entries
--- NEW FILE: ValidatingEntry.py ---
#!/usr/bin/env python
from Tkinter import *
class ValidatingEntry(Entry):
"""
ValidatingEntry Class in full or in part from
http://effbot.org/zone/tkinter-entry-validate.htm
"""
# base class for validating entry widgets
def __init__(self, master, value="", **kw):
apply(Entry.__init__, (self, master), kw)
self.__value = value
self.__variable = StringVar()
self.__variable.set(value)
self.__variable.trace("w", self.__callback)
self.config(textvariable=self.__variable)
def __callback(self, *dummy):
value = self.__variable.get()
newvalue = self.validate(value)
if newvalue is None:
self.__variable.set(self.__value)
elif newvalue != value:
self.__value = newvalue
self.__variable.set(newvalue)
else:
self.__value = value
def validate(self, value):
# override: return value, new value, or None if invalid
return value
class IntegerEntry(ValidatingEntry):
"""
IntergerEntry in full or in part from http://effbot.org/zone/tkinter-entry-validate.htm
"""
def validate(self, value):
try:
if value == '':
return value
elif value:
v = int(value)
return value
except ValueError:
return None
class FloatEntry(ValidatingEntry):
"""
FloatEntry in full or in part from http://effbot.org/zone/tkinter-entry-validate.htm
"""
def validate(self, value):
try:
if value == '':
return value
elif value:
v = float(value)
return value
except ValueError:
return None
class MaxLengthEntry(ValidatingEntry):
"""
MaxLengthEntry in full or in part from http://effbot.org/zone/tkinter-entry-validate.htm
"""
def __init__(self, master, value="", maxlength=None, **kw):
self.maxlength = maxlength
apply(ValidatingEntry.__init__, (self, master), kw)
def validate(self, value):
if self.maxlength:
value = value[:self.maxlength]
return value
else:
return value
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