Johannes, if you ever look into this, maybe text editors could provide an
inspiration, because they apply most changes live, without any explicit
"commit" action from the user, and yet have a highly granular undo history.
Another inspiration could be Adobe Lightroom. The end of action (mouse
release), as suggested by Štěpán, could certainly work very well, both for
curve-based and for slider based modules.
George
> Date: Thu, 29 Nov 2012 17:14:23 +1300
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: [Darktable-users] "OK" button
>
> On Thu, Nov 29, 2012 at 12:59 PM, francis <[email protected]> wrote:
> > On 12-11-28 01:40 PM, George Pop wrote:
> >
> > I didn't mean branching in any way, just a linear undo/redo. The history
> > stack as it exists right now is limited in one significant way.
> >
> > For example, if you adjust the tone curve, now the tone curve is at the top
> > of the stack, and you can certainly go back to the previous state. But let's
> > say you make one further adjustment to the tone curve, and you don't like
> > it, and you want to go to the previous state _of the tone curve_. You can't,
> > because the history stack only has one entry for the module at the top, and
> > will create a new entry only when you switch to a different module. This is
> > problematic especially with the curve-based modules, because you can't
> > easily restore the previous curve.
>
> the hard part is to tell what's the previous one while you're
> continuously dragging a curve point. you need some mechanism to avoid
> spamming your history stack with one million entries per second.
> introducing a new item after a certain timeout sounds like a terrible
> plan.
>
> j.
>
> >
> > Right now, we can work around this limitation by doing a fake/dummy
> > operation (like toggling a random module) to make sure that a new entry will
> > be created in the history before a new adjustment, but this is less than
> > ideal.
> >
> > Am I making sense?
> >
> > George
> >
> >
> > Rrevvr (+1 in blazingsaddlish).
> >
> > F
> >
> >
> >> Date: Thu, 29 Nov 2012 09:44:07 +1300
> >> Subject: Re: [Darktable-users] "OK" button
> >> From: [email protected]
> >> To: [email protected]
> >> CC: [email protected]; [email protected]
> >>
> >> On Wed, Nov 28, 2012 at 11:10 PM, George Pop <[email protected]> wrote:
> >> > Actually, I don't think the OK button is the solution. I like how
> >> > changes
> >> > are applied live, I just would like to have undo.
> >>
> >> the history stack is precisely an undo list. it's just not a tree, so
> >> if you go back and re-apply new stuff, you lose the old branch.
> >>
> >> > The two aren't
> >> > incompatible with one another. A text editor, for example, applies the
> >> > changes live, and every keystroke adds a step to the undo history.
> >> >
> >> > George
> >> >
> >> >
> >> > ________________________________
> >> > Date: Wed, 28 Nov 2012 09:26:23 +0100
> >> > From: [email protected]
> >> > To: [email protected]
> >> > Subject: [Darktable-users] "OK" button
> >> >
> >> >
> >> > I agree with you, Ivan. I also use a fake operation to create the proper
> >> > steps in the history (usually, I just toggle the over/underexposed
> >> > indicator). I don't know what would be the ideal solution. This problem
> >> > is a
> >> > consequence of the fact that changes are applied live, without an "OK"
> >> > button. It would be nice to have real undo, especially with the modules
> >> > that
> >> > don't take numerical inputs (Tone curve, Color zones etc.). It's almost
> >> > impossible to restore a curve perfectly, and that discourages
> >> > experimentation.
> >> > George
> >> >
> >> >
> >> > + 1
> >> >
> >> > Philippe DELETREE
> >> >
> >
> >
> > Island Light Photography
> > www.islandlight.ca
> >
> >
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> >
>
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