Zabin Farishta wrote:
Hey!
I am trying to implement the undo and redo facility in pyqt. I have gone
through some sites and was wondering whether iyou always need to
create subclasses and their definitions for the undo/redo action. My program
currently has a single window in which the user enters information which is
used to update a text file as soon as the user
leaves the field- so i essentially need to undo the text in that field as
well as the file. I am puzzled as to how to approach this. Any help will be
much appreciated!
You need to save the data somewhere every time it changes. For my app I
pickle a document class every time something changes and keep a list of
the pickle files. A undo/redo loads the pickled class to current and
refresh. I delete all the pickle files on program exit. It might make
sense in your case just to save the deltas. My app is used on images
and it was just easier to pickle everything.
Russell Valentine
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