Entry validation: Logical Name : Pmw Validation Field « GUI Pmw « Python






Entry validation: Logical Name

Entry validation: Logical Name
#Pmw copyright

#Copyright 1997-1999 Telstra Corporation Limited, Australia 
#Copyright 2000-2002 Really Good Software Pty Ltd, Australia

#Permission is hereby granted, free of charge, to any person obtaining a copy 
#of this software and associated documentation files (the "Software"), to deal 
#in the Software without restriction, including without limitation the rights 
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
#copies of the Software, and to permit persons to whom the Software is furnished 
#to do so, subject to the following conditions:

#The above copyright notice and this permission notice shall be included in all 
#copies or substantial portions of the Software.

#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
#INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
#PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
#HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
#OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
#SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 




import string
from Tkinter import *
from tkMessageBox   import askquestion, showerror

def validLName(value):
    valid = 0
    try:
        if len(value) >= 3:
            ucFTC = string.upper(value[:2])
            if ucFTC == 'CP':
                valid = 1
    except:
        pass
    if valid:
        retval = 'CP' + value[2:]
        replace = 1
    else:
        showerror(title='Invalid Logical Name',
                  message='Format: CP+<text>')
        retval = value
        replace = 0
    return (retval, replace, valid)


class EntryValidation:
    def __init__(self, master):
        self._ignoreEvent = 0
        self._ipAddrV = self._crdprtV = self._lnameV = ''
        
        frame = Frame(master)
        Label(frame, text='   ').grid(row=0, column=0,sticky=W)
        Label(frame, text='   ').grid(row=0, column=3,sticky=W)
        
        self._lname = self.createField(frame, width=20, row=2, col=2,
           label='Logical Name:', valid=self.validate, enter=self.activate)

        self._wDict = {self._lname:  ('_lnameV',  validLName) }
                                        
        frame.pack(side=TOP, padx=15, pady=15)
        
    def createField(self, master, label='', text='', width=1,
                    valid=None, enter=None, row=0, col=0):
        Label(master, text=label).grid(row=row,   column=col-1, sticky=W)
        id = Entry(master, text=text, width=width, takefocus=1)
        id.bind('<Any-Leave>', valid)
        id.bind('<FocusOut>', valid)
        id.bind('<Return>',   enter)
        id.grid(row=row, column=col, sticky=W)
        return id
    
    def activate(self, event):
        print '<Return>: value is', event.widget.get()

    def validate(self, event):
        if self._ignoreEvent:
            self._ignoreEvent = 0
        else:
            currentValue = event.widget.get()
            if currentValue:
                var, validator = self._wDict[event.widget]
                nValue, replace, valid = validator(currentValue)
                if replace:
                    self._ignoreEvent = 1
                    setattr(self, var, nValue)
                    event.widget.delete(0, END)
                    event.widget.insert(0, nValue)

                if not valid:
                    self._ignoreEvent = 1
                    event.widget.focus_set()
  
root = Tk()
root.option_add('*Font', 'Verdana 10 bold')
root.option_add('*Entry.Font', 'Courier 10')
root.title('Entry  Validation')

top = EntryValidation(root)
quit = Button(root, text='Quit', command=root.destroy)
quit.pack(side = 'bottom')
 
root.mainloop()


           
       








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