Patch for thumbnail update in layerbox

[Boudewijn Rempt]

On Tuesday 21 September 2010, Cyrille Berger wrote:
> On Sunday 19 September 2010, Boudewijn Rempt wrote:
> > On Sunday 19 September 2010, Dmitry Kazakov wrote:
> > > I think adding parameters is the worst thing that we can do here =(
> > 
> > Maybe it would be better to bite the bullet & not use the locked system to
> > hint for updates, but add a signal updated() to KisBaseNode that can be
> > emitted by tools when they are done.
> Yes I quite agree. Sounds like it is a workaround, that abuse an other 
> workaround. The reason systemLock was added is because we didn't had a system 
> to queue actions.
> 
> This is why I also agree with Dmitry that systemLock should disappear one day.
> 
> It should be replaced by a list of action that need to be applied on a node, 
> and in a thread, the first action of that list is applied in thread, and tools 
> only add new actions to that list. And some tools (or paintops) that needs an 
> empty list (think the duplicate op) would simply be locked or prevented to 
> paint (and show the "blocked" cursor).
> 
> We basically have all the bricks to implement this with the ThreadApplicator 
> framework, and the action recorder to provide the actions.

I think that's 2.4 stuff, though.

-- 
Boudewijn Rempt | http://www.valdyas.org
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