[Tkinter-discuss] Re: Problem with Text widget's "see" method

[Jared Cohen]

Sorry, I forgot to include the previous message text:

>Martin Franklin wrote:
>> Jared Cohen wrote:
>> 
>>>>
>>>>
>>>> I see you got lots of help on the 'see' problem I just wanted to 
>>>> point out the Text widget comes with it's own undo/redo methods as of 
>>>> Tk 8.4
>>>> so if you have an up to date Python & Tk you should be able to use them
>>>>
>>>
>>> Thanks anyway, but the undo doesn't seem to work. It's weird, because 
>>> there IS an edit_undo() method in Tkinter.py (the Python wrapper), but 
>>> apparently, the underlying Tk doesn't understand the command. Oh well.
>> 
>> 
>> I guess your Tk version is not >= 8.4 thats too bad.
>> 
>>>
>>> Anyway, I still need some help with this "see" problem. Come on guys, 
>>> isn't there a way to fix this?
>>>
>>>
>> 
>> I have tried a couple of things but it boils down to the fact you are
>> replacing all the text in the widget, it just has to move (without the
>> see call it moves the viewpoint to the top of the text widget)  If I
>> were you I would investigate the IDLE undo / redo stuff Fredrik pointed
>> you to, it undoes / redoes just the small changes (not the entire
>> document)  I must admit *I* looked into that code when I needed undo /
>> redo in a small project, I couldn't quite grok the code, eventually the
>> need went away, but it would be nice if we could use the undo/redo from
>> idlelib on *any* Tkinter Text widget - I seem to remember when I was
>> looking at it it had a lot of idle dependencies... you couldn't just,
>> for example:
>> 
>> undoer = idlelib.Undoer(myTextWidget) # or whatever it's called
>> 
>> and have it look after the undo and redo 'ing of your text widget
>> would be nice if we could though;-)
>
>And it seems (after a little more investigation) we can...
>
>from Tkinter import Tk, Text
>
>from idlelib.Percolator import Percolator
>from idlelib.UndoDelegator import UndoDelegator
>root= Tk()
>
>
>text = Text(root)
>text.pack()
>
>per = Percolator(text)
>undo = UndoDelegator()
>per.insertfilter(undo)
>
>text.bind("<F1>", undo.undo_event)
>text.bind("<F2>", undo.redo_event)
>
>root.mainloop()
>
>*Seems to work* but has only been tested for 1 minute....
>
>Cheers,
>Martin.
>
>
>
>
>
>  
>
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