Re: [Tuxpaint-devel] Magic API updated: switchin() and switchout()

[Bill K. <nb...@so...>]

I understand the jist, but could you give me an example chunk of code
(within a Magic tool) where this is used, so I can make sure I do it
properly?  (I don't want to forget to do this, which I will in a matter
of days :^/ )

-bill!

On Tue, Jul 08, 2008 at 04:48:24AM -0400, Albert Cahalan wrote:
> On Mon, Jul 7, 2008 at 9:57 PM, Bill Kendrick <nb...@so...> wrote:
> >
> > Magic Tools now receive calls to "switchin()" and "switchout()" functions
> > to tell them when they are being activated and deactivated.
> >
> > Currently, deactivation includes when temporary events happen,
> > such as the user clicking Undo or Redo (or hitting Ctrl-Z, etc.),
> 
> Quick, before this feature gets abused, add this:
> 
> Each history level should have a void* that can be
> filled in by a tool, and a void(fn*)(void*,etc) that gets
> called when the history level is destroyed. This would
> allow tool-private data.
> 
> For example, suppose I paint with bricks. At long as
> the top-most history level is the bricks tool, I want to
> keep using the same old brick connectivity map. When
> the user draws with something else, I need a fresh map.
> If the user reverts via undo however, I want my old map.
> 
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-- 
-bill!
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