Prevent a callback form being invoked until the mouse button is released

[miguel-winfield]

Hi ,Am current writing a command plugin utilizing MAnimMessage::addAnimCurveEditedCallback ()

the callback is invoked whenever a animcurve is made or edited (which is I want) , but what I don't like is, the callback keeps being invoked even when you are hold and dragging to edit animcurves in grapheditor. what I want is only invoke the callback after the mouse is released,cos the callback may be heavy sometimes.

there seems no provided ways from MAnimMessage class. 
so I think maybe in callback function, I will set some if statements , if the mouse is still holding then return and do nothing.
problem is how can I know whether the mouse is currently released or not? 

anyone got a suggestion? Thanks a lot

 file:///D:/Program%20Files/Autodesk/Maya2008/docs/Maya2008/en_US/API/MAnimMessage.html#DOC.10.7.1

[joojaa]

What one usually does in flood situation is as follows, when callback comes in it cheks a timer, if the timer is smaller than say under 40 milliseconds, then return otheriwise issue compute. Alternatively computre on first change but do it in background and dont accepts new jubs untill its done, just keep a flag that its asked to update then when finsihed check if still needs to update and update in bg untill theres no need to update.

a seocdary alternate way is to just ask the mouse state form the operating system. Even cleaner if its down dont do anything, so just note thet you need to compute then wait for next mouse up.

[miguel-winfield]

thank you Joojaa   I think the second way could be better for me.  

So there's  no way to detect the mouse hold/ release condition in maya api? ( except context command. )

By the way, how do you do a job in BG in maya api? I try threadPool and threadAsync class, but maya still be halted during the execution.  MGlobal::excuteCommandOnIdle seems not working either.   maybe it is my  problem?  

[joojaa]

hold/ release condition in maya api?

theres really no need your not supposed to do heavy caluculation in callbacks. mark dirty for timer/defeeral is light for allmost all applications, and its trivial to implement. You have to understand thet even maya works like this.

Well theres really no need to duplicate stuff you get for free from the underlying system. But yeah i suppose there actually is if your using maya 2011 or 12 you can ask qt to spit that out for you. Sicne qt api is qt api its described under that stuff insetad of api docs.