[Fluxus] mouse events handling

[Kassen]

On Wed, Mar 20, 2013 at 04:39:09PM +0400, Ivan Youroff wrote:
>    Hello there!
>    I checked documentation and reference, and haven't found any natural way
>    to implement mouse event handler. Fluxus manual suggests to handle it in
>    every-frame loop using states of (mouse-button). I thinks it's possible to
>    get the switch moment keeping the state from prevous frame, but it will
>    definitely skip short touches (with apple's trackpad for example).
>    Is there any simple way to write the callback for exact events like
>    button-down/button-up?

This sounds a bit similar to the problem I had with MIDI; quantising
all analysis of the clock to the frame-rate would give considerable
jitter when trying to figure out the BPM. I went into the C++ code
dealing with incoming MIDI and time-stamped the events there. I
imagine something like that will be needed here, it depends a bit on
what you need. I can see how if this would happen;
-frame tick
-button down
-button up
-frame tick
....you'd miss the button event. A "button-down-since-last-frame"
would cure that. The keyboard interface has it, maybe the mouse lacks
it. I wonder whether that would be enough. It sounds a bit like what
you want would be more like linking buttons to functions that would
-at a event- be called with -say- the current mouse cursor location as
a parameter. That would be more powerful but considerably harder, I
don't think we have anything like that right now. Without something
like that I don't see how we'll keep awareness of the mouse cursor's
location at the moment of a button-down event; clearly that is likely
important information.

Interesting issue.

Yours,
Kas.