[Tkinter-discuss] TclError when destroying parent windows

[Jusa]

Mick O'Donnell wrote:
> 
> Hi Jusa,
> 
>   Can you post some sample code which causes the problem?
> 
> Mick
> _______________________________________________
> Tkinter-discuss mailing list
> Tkinter-discuss at python.org
> http://mail.python.org/mailman/listinfo/tkinter-discuss
> 
> 

Hi Mick, 

It's rather lengthy but here goes (the error-causing lines are at the
bottom):


from Tkinter import *

class MyDialog(Toplevel):
    '''
    Base class for custom dialogs.
    '''
    
    def __init__(self, master, title, size):
        Toplevel.__init__(self, master)
        
        self.title(title)
        self.accepted = False

        x = self.master.winfo_rootx() + self.master.winfo_width() / 2
        y = self.master.winfo_rooty() + self.master.winfo_height() / 2
        
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        self.wndSize = size
        self.geometry('+%d+%d' % (size[0], size[1]))
        
    def display(self):
        '''
        Displays the dialog and returns the parameters polled from the user.
        '''
        
        self.build()
        self.transient(self.master)
        self.grab_set()
        self.protocol('WN_DELETE_WINDOW', self.onCancel)
        x = self.master.winfo_rootx() + self.master.winfo_width() / 2
        y = self.master.winfo_rooty() + self.master.winfo_height() / 2
        self.geometry('+%d+%d' % (x, y))
        self.wait_window(self)
        return self.output()

    def build(self):
        '''
        Override: use this to construct the widgets on the dialog.
        '''
    
    def output(self):
        '''
        Override: use this to return any dialog-specific parameters at the
        end of display()
        '''
        
        return None
    
    def validate(self):
        '''
        Override: use this to validate user input in the dialog.
        '''
        
        return True
    
    def onOk(self, event=None):
        '''
        Callback for accepting the dialog.
        '''
        if self.validate() == False:
            return
        
        self.accepted = True
        self.withdraw()
        self.update_idletasks()
        self.onCancel()
    
    def onCancel(self, event=None):
        '''
        Callback for rejecting the dialog.
        '''
        self.master.focus_set()
        self.master.grab_set()
        self.destroy()

class MyMessageDialog(MyDialog):
    '''
    A simple custom message dialog.
    '''
    
    def __init__(self, master, title, message, btnText='Ok', size=(200,
80)):
        MyDialog.__init__(self, master, title, size)
        
        self.message = message
        self.btnText = btnText
    
    def build(self):
        self.frame = Frame(self, padx=7, pady=7)
        self.frame.pack(fill=BOTH, expand=YES)
            
        self.messageLbl = Label(self.frame, text=self.message,
wraplength=self.wndSize[0]-7*2, justify=CENTER)
        self.messageLbl.pack(fill=BOTH, expand=YES)
        
        self.yesBtn = Button(self.frame, text=self.btnText,
command=self.onOpenError)
        self.yesBtn.pack(pady=5)
        self.bind('<Return>', self.onOk)
        self.bind('<Escape>', self.onOk)

    def onOpenError(self):
        dlg = MyMessageDialog(self, 'Watch out', 'En error occurs when you
close the window \'Hello\'.', 'Don\'t press this')
        dlg.display()
        
        #ERROR:
        dlg = MyMessageDialog(self, 'Error', 'This dialog causes the
error.')
        dlg.display()
        #/ERROR

root = Tk()

hello = MyMessageDialog(root, 'Hello', 'Good day!', 'Open error')
params = hello.display()

root.mainloop()

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