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#coding=utf-8
import tkinter as tk
class NotifyVar(tk.Variable):
def __init__(self, *args, **kwargs):
tk.Variable.__init__(self, *args, **kwargs)
self._prevValue = self.get()
self._root.after(0, self.trace, 'w', self._onChange)
def _onChange(self, *args):
if self._prevValue != self.get():
self._root.event_generate('<<ValueChanged>>', when='tail')
self._prevValue = self.get()
class NumericVar(tk.StringVar):
def get(self, default=None):
try:
return int(str(tk.StringVar.get(self)).strip())
except ValueError:
return default
class NotifyStringVar(NotifyVar, tk.StringVar):
pass
class NotifyIntVar(NotifyVar, tk.IntVar):
pass
class NotifyNumericVar(NotifyVar, NumericVar):
pass
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