TKinter problem

[ezd]

C D Wood wrote:
> To whom this may concern,
>                                         Below is the source code, which
>
> demonstrates a
> problem I am having making a GUI for my python project  work.
> 'table.txt'
> is a file that is read from the same folder.
>
> My code writes to a text file 'table.txt', and 'table.txt' is displayed
> in
> the GUI. The user can generate new data at the click of a button
> which re-writes 'table.txt', but I can only add the new table to the
> GUI
>  window rather than 'update' the existing one.
>
> Any assistance would be much appreciated,
>
> Regards,
> Christian Wood.
> Part III Aerospace Engineering
> University of Southampton, UK.
>
> ##################################################################
> from Tkinter import *
>
> #Tkinter User Interface
> class MoC:
>     def __init__(self, master):
>         frame = Frame(master, width=600, height=800, bd=1)
>         frame.pack()
>
>         #Button frame
> 	iframe4 = Frame(frame, bd=2, relief=SUNKEN)
> 	#Using this button below, I want to update the text box in iframe5.
>         Button(iframe4, text='Display table.txt',
> command=self.DisplayUpdate).pack(side=LEFT, padx=5)
>         Button(iframe4, text='Quit', command=self.quit).pack(side=LEFT,
> padx=5)
>         iframe4.pack(expand=1, fill=X, pady=10, padx=5)
>
>         #Text box frame
>         iframe5 = Frame(frame, bd=2, relief=SUNKEN)
>         text=Text(iframe5, height=10, width =70)
>         fd = open('table.txt')  #table.txt must be in the same folder
>         lines = fd.read()
>         fd.close()
>         text.insert(END, lines)
>         text.pack(side=LEFT, fill=X, padx=5)
>         sb = Scrollbar(iframe5, orient=VERTICAL, command=text.yview)
>         sb.pack(side=RIGHT, fill=Y)
> 	text.configure(yscrollcommand=sb.set)
>         iframe5.pack(expand=1, fill=X, pady=10, padx=5)
>
>     #Command definitions
>     def quit(self):
>         root.destroy()
>
>     def DisplayUpdate(self): #The command definition used to update the
> display.
>         #Could I insert a line here to remove the existing frame/text
> box first?      <<<<<=====
>         iframe5 = Frame(root, bd=2, relief=SUNKEN)
>         text = Text(iframe5, height=10, width =70)
>         fd = open('table.txt')
>         lines = fd.read()
>         fd.close()
>         text.insert(END, lines)
>         text.pack(side=LEFT, fill=X, padx=5)
>         sb = Scrollbar(iframe5, orient=VERTICAL, command=text.yview)
>         sb.pack(side=RIGHT, fill=Y)
> 	text.configure(yscrollcommand=sb.set)
>         iframe5.pack(expand=1, fill=X, pady=10, padx=5)
>
> root = Tk()
> root.option_add('*font', ('arial', 10))
> all = MoC(root)
> root.title('2D Method of Characteristics')
> root.update
> root.mainloop()

What you want probably looks like this:

from Tkinter import *
class MoC:
    def __init__(self, master):
        frame = Frame(master, width=600, height=800, bd=1)
        frame.pack()
        iframe4 = Frame(frame, bd=2, relief=SUNKEN)
        Button(iframe4, text='Display table.txt',
            command=self.DisplayUpdate).pack(side=LEFT, padx=5)
        Button(iframe4, text='Quit',
command=self._quit).pack(side=LEFT, padx=5)
        iframe4.pack(expand=1, fill=X, pady=10, padx=5)
        iframe5 = Frame(frame, bd=2, relief=SUNKEN)
        self.text=Text(iframe5, height=10, width =70)
        # read the file in the update function; create Text & Scrollbar
only once
        self.text.pack(side=LEFT, fill=X, padx=5)
        sb = Scrollbar(iframe5, orient=VERTICAL,
command=self.text.yview)
        sb.pack(side=RIGHT, fill=Y)
        self.text.configure(yscrollcommand=sb.set)
        iframe5.pack(expand=1, fill=X, pady=10, padx=5)
        self.DisplayUpdate()
    def _quit(self):  # quit is a keyword in python 2.4 IDE
        root.destroy()
    def DisplayUpdate(self):
        fd = open('table.txt')
        lines = fd.read()
        fd.close()
        self.text.config(state=NORMAL)
        self.text.delete(1.0, END)
        self.text.insert(END, lines)
        self.text.config(state=DISABLED)
        # previous 4 lines are to make the text READONLY, see more in:
        #
http://www.pythonware.com/library/tkinter/introduction/x8309-patterns.htm
root = Tk()
root.option_add('*font', ('arial', 10))
all = MoC(root)
root.title('2D Method of Characteristics')
root.update 
root.mainloop() 

ezd