[Okular-devel] An Undo / Redo framework for annotations

[Fabio D'Urso]

On Saturday, October 13, 2012 11:43:38 PM Jon Mease wrote:
> Hello all,
Hi,

> My next goal for enhancing Okular's annotation framework is to
> add undo / redo support when creating/editing/deleting annotations.
> Looking back at the list archives it seems like this is something that
> has been asked for and mentioned in bug reports for several years now.
> Before starting in I wanted to ask whether anyone has already started
> work on this.

It's still unexplored land :D
No one has worked on this yet

> I have some experience with Qt's Undo/Redo framework and this is what
> I'm planning on using.  At the highest level my thought is to write
> QUndoCommands for each of the following annotation actions
>     1) Creating a new annotation with a particular set of properties
>     2) Deleting an existing annotation
>     3) Editing an annotation's properties (color, opacity, etc)
>     4) Moving an annotation's position
>     5) Editing text in a text annotation (this would rely on the
> undoAvailable signal of QTextEdit)

Sounds mostly correct to me. You can join #okular on freenode to discuss your 
ideas live with other developers.

> Does anyone have any thoughts on the subject?  Does an existing
> undo/redo branch or patch exists somewhere?  If not, I'll probably get
> started on one this coming week.

Great! Keep us informed ;)

Thank you,
Fabio