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

[Albert C. <aca...@gm...>]

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.