Source code for validator_mixins

'''
Validator MixIns

by Patrick Ruoff in 2012
'''

import wx
import string


ACCEPT_ALPHA = 1
ACCEPT_NUM = 2
ACCEPT_MINUS = 4
ACCEPT_POINT = 8

ACCEPT_UINT = ACCEPT_NUM
ACCEPT_INT = ACCEPT_NUM | ACCEPT_MINUS
ACCEPT_UFLOAT = ACCEPT_NUM | ACCEPT_POINT
ACCEPT_FLOAT = ACCEPT_NUM | ACCEPT_MINUS | ACCEPT_POINT 

class CTextFilterMixin(object):
    """ A text filter, accepting only specified characters """
    
    flag = None;
    
    def __init__(self, flag):
        """ Construct a CTextFilterMixin which accepts the characters specified by the *flag* bitfield 
        (see above for possible values) """ 
        super(CTextFilterMixin, self).__init__();
        self.flag = flag;
        self.Bind(wx.EVT_CHAR, self.OnChar);

    def OnChar(self, event):
        key = event.GetKeyCode();

        if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
            event.Skip();
            return;

        if (self.flag & ACCEPT_ALPHA and chr(key) in string.letters) or \
           (self.flag & ACCEPT_NUM   and chr(key) in string.digits ) or \
           (self.flag & ACCEPT_MINUS and chr(key)=='-' ) or \
           (self.flag & ACCEPT_POINT and chr(key)=='.' ):
            event.Skip();
            return;
        
        if not wx.Validator_IsSilent():
            wx.Bell();
            
        print 'not skip'


def MixIn(V, VM):
    """ Mixin function: mixes the ValidatorMixin *VM* to the Validator *V*,
    returns a new Validator inheriting from both """
    class C(V, VM):
        def __init__(self, v_args, vm_args):
            V.__init__(self, *v_args);
            VM.__init__(self, *vm_args);
            self.vm_args = vm_args
    
        def Clone(self):
            clone = V.Clone(self);
            clone.__class__ = C;
            VM.__init__(clone, *self.vm_args);
            return clone;
        
    return C;