Pending Messages

[Phil Davis]

Hi Michael,

On 2/14/12 2:09 PM, Michael Doub wrote:
> I am looking for some advise before start trying to figure out how throw away messages .
>
> I am currently catching touch movement events and rendering a graph within a slider.  Clearly the rendering is slowing things a bit and I am
> experiencing some sluggishness.   I am thinking about trying to look at the pending messages from within the touch move handler and only processing the last move message.

One way to do that:

local sDoitID -- ID of a pending message

on touchMove tID, x, y
     cancel sDoitID -- works OK if no ID exists too
     send "doit x,y" to me in 1 tick
     put the result into sDoitID
end touchMove

This way there is only one pending message at any time - and it's the last one 
sent. Maybe that will improve responsiveness.

Best -
Phil Davis

> Initially I was thinking of replacing the doit command below with a send after 0 ticks command but it seems to me this would only work if the TouchMove message is a higher priority than the doit message.  For that matter checking in the touch move handler assumes that the engine is adding touch messages to the pending message list at a higher priority that the TouchMove handler itself.
>
> I don't think there is any notion of priority in the message path, so I am not sure if I am thinking about this problem correctly.   Can anyone provide me with a bit of advice on this topic.
>
> Thanks
>    Mike
>
>
>
>
> today:
>
> On TouchMove tID, x, y
>    doit x, y
> end TouchMove
>
> On doit
> -- render here
> End doit
>
>
> Option 1:
>
> On TouchMove tID,x,y
>     look at pending messages
>     capture the x y of the last message
>     cancel all of the touch move messages
>    doit x,y
> End TouchMove
>
>
> Option 2:
>
> On TouchMove tID, x, y
>    send ("doit"&&   x&  comma&  y) to me in 0 ticks
> end TouchMove
>
> On doit
>     look at pending messages
>     capture the x y of the last doit message
>     cancel all of the doit messages
> -- render here using last x y
> End doit
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-- 
Phil Davis

PDS Labs
Professional Software Development
http://pdslabs.net