> It doesn't seem too hard to implement a button - just check for the
> mouse to be in certain coordinates and then execute the same procedure that
> button would have done. RIght?
Also consider cancellability -- if you click in the button, and then drag
outside it, it should revert to an unpressed state, and then if you drag
back it, it should be pressed again, etc. There can be a lot of these
details to try to replicate. Then there's the problem of what happens when
your platform changes its standard look...
(I am mindful of a well-known web usability testing company's recent report
that of all sites they had tested that implemented non-standard scroll bars,
using Flash or some such, a whopping 0% were successfully used by real-world
users.)
That said, it can certainly be done. Clickable, draggable objects within a
canvas are a good way to solve many UI problems. I'd just concentrate on new
kinds of controls, rather than replicating existing ones.
lj
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