I know that the Ableton programmers have joked about the challenges of designing their endless undo system. I am guessing that it relies upon keeping track of every change between state saves, since they also have a nifty feature that will rescue unsaved changes if the system crashes for some reason. This is stored in a temporary file location specified in the preferences menu of the program.<br>
<br>So basically the multiple undo system would have to keep a running log in some temporary file, documenting each state change in the software. Beyond me, but I agree that this feature is much-desired!<br><br>~Kyle<br><br>
<div class="gmail_quote">On Sat, Jan 31, 2009 at 10:04 AM, Mathieu Bouchard <span dir="ltr"><<a href="mailto:matju@artengine.ca">matju@artengine.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On Sat, 31 Jan 2009, Enrique Erne wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
there has been many good ideas about usability features, so here come my most beloved ones: multiple undo be a great improvement. would that be difficult?<br>
</blockquote>
<br></div>
When I originally harassed Miller so that he implements undo, I thought he'd go for multiple undo. Instead, he went for single. Basically there's not much more you have to do to get multiple undo if the single undo was done "right", but that means "if the single undo has been implemented with a future multiple undo in mind". The undo-system is one of the rare parts of pd source-code that I haven't read, because I wanted to reimplement it from scratch anyway. So I can't really tell you right away whether Miller's system could be adapted or not.<br>
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My own multiple-undo code doesn't really work well, but that's not because it's multiple, it's because it's implemented in the client instead, and there were too many things that had to be changed in the server to get that working, and I have other excuses as well ;)<br>
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