How to implement undo/redo of files mapped in a treeview

Question

Can anyone give an idea of how should I implement undo/redo of cutting/copying/pasting of files (dirs, subdirs) mapped in a treeview in C#?

It would be great to have some code samples.

What do you mean undo / redo? What are you doing with them? – xan Dec 15 '08 at 11:32 — xan, Dec 15 '08 at 11:32
Could you please change the topic to something meanfully? – Oliver Friedrich Dec 15 '08 at 11:42 — Oliver Friedrich, Dec 15 '08 at 11:42

score 7 · Answer 1 · answered Dec 15 '08 at 11:52

Consider implementing Command pattern (GoF):

Put your actions logic into classes which implement common ICommand {Do(); Undo();} interface.
On each user action you create object of command requested and initialize it with context parameters like new and old filename.
Call Do(), put object into stack of completed commands.
Each command is supplied with context, so by calling Undo() it can reverse changes.
Consider moving files into temporary folder instead of removals.

score 5 · Answer 2 · answered Dec 15 '08 at 11:39

5

Undo / redo is typically implemented using the so-called "command pattern". Search with Google or read the following article:

http://blogs.vbcity.com/jspano/articles/198.aspx

answered Dec 15 '08 at 11:39

Dirk Vollmar

+1 for a Good answer, but no idea if it answers the question :) – Robert Gould Dec 15 '08 at 11:46
I also have no idea whether it answers the question ;-) – Dirk Vollmar Dec 15 '08 at 12:00
with the new subject, do you understand the question? – Cornel Dec 15 '08 at 13:43
No. What are the actions that you want to do/undo? – Dirk Vollmar Dec 15 '08 at 16:38
P.S.: Your subject simply repeats now what was already written in the first sentence. – Dirk Vollmar Dec 15 '08 at 16:39
The TreeView can Cut/Copy/Paste mapped files. Undo/Redo should also be supported. Understood? – Cornel Dec 16 '08 at 07:30

score 1 · Accepted Answer · answered Dec 15 '08 at 11:52

1

For a quick linear undo/redo, you can use Memento pattern using zip of file as memento.

answered Dec 15 '08 at 11:52

Eugene Yokota

3 Answers3