Il 16/01/19 08:51, Peter Otten ha scritto:
def make_ui(self):
''' create user interface '''
def vcmd(maxlength):
return self.parent.register(
partial(self.maxlength_validate, maxlength=maxlength)
), "%P"
...
ok following your advice and that of Rick in the previous post, I
developed 2 solutions, one without classes and one with classes. I write
to you if you need someone:
1) solution with class
(taking a cue from here:
http://effbot.org/zone/tkinter-entry-validate.htm - I wanted to reduce
the code, I'm working on it)
from Tkinter import *
class View():
''' example for set max length of char in Entry widget.
-Class implantation-
'''
def __init__(self, parent):
self.parent = parent
self.make_ui()
def make_ui(self):
''' create user interface '''
self.id1_entry = self.make_entry(self.parent, maxlen=1).pack()
self.id2_entry = self.make_entry(self.parent, maxlen=2).pack()
self.id3_entry = self.make_entry(self.parent, maxlen=3).pack()
self.id4_entry = self.make_entry(self.parent, maxlen=4).pack()
self.id5_entry = self.make_entry(self.parent, maxlen=5).pack()
def make_entry(self, parent, width=50, maxlen=30,
highlightcolor='blue',
validate='key'):
entry = MyEntry(parent, maxlen=maxlen)
entry.configure(width=width, highlightcolor=highlightcolor)
return entry
class ValidatingEntry(Entry):
# 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)
self.configure(highlightcolor='blue')
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 MyEntry(ValidatingEntry):
def __init__(self, master, value="", maxlen=None, **kw):
self.maxlength = maxlen
apply(ValidatingEntry.__init__, (self, master), kw)
def validate(self, value):
return value[:self.maxlength]
def run():
root = Tk()
root.title('test')
View(root)
root.mainloop()
if __name__ == "__main__":
run()
------------------------------------------------------------
2) classless solution (part of your code)
from Tkinter import *
from functools import partial
class View():
''' example for set max length of char in Entry widget.
-Functions implantation-
'''
def __init__(self, parent):
self.parent = parent
self.make_ui()
def make_ui(self):
''' create user interface '''
self.id1_entry = self.make_entry(self.parent, maxlen=1).pack()
self.id2_entry = self.make_entry(self.parent, maxlen=2).pack()
self.id3_entry = self.make_entry(self.parent, maxlen=3).pack()
self.id4_entry = self.make_entry(self.parent, maxlen=4).pack()
self.id5_entry = self.make_entry(self.parent, maxlen=5).pack()
def make_entry(self, parent, width=50, maxlen=30,
highlightcolor='blue',
validate='key'):
def vcmd(maxlength):
return self.parent.register(partial(self.maxlength_validate,
maxlength=maxlength)), "%P"
entry = Entry(parent)
entry.configure(width=width, highlightcolor=highlightcolor,
validate='key', validatecommand=vcmd(maxlen))
return entry
def maxlength_validate(self, value, maxlength):
return len(value) <= maxlength
def run():
root = Tk()
root.title('test')
View(root)
root.mainloop()
if __name__ == "__main__":
run()
Thank you all
--
https://mail.python.org/mailman/listinfo/python-list
