Re: [Jsynthlib-devel] Limitations in ParamModel

[Bill Z. <wrz...@po...>]

Joe Emenaker wrote:

> I made a "DataModel" interface. The idea behind it is that it handles 
> all of the nuisance of stripping off leading bytes (ie, F0, manufID, 
> devID, etc) and trailing F0 and it handles any conversion to/from 
> 8-bit bytes or whatnot.
>
> Then, I made a new ParamModel which, when it needs data, asks the 
> DataModel for it. So, the ParamModel and addWidget never need to see 
> the actual Patch.

So did I, good job.  :)

Two things to watch out for:
* In Java, bytes are signed.   So if the range is 0..255 before, casting 
it to a (Byte) will change that to -128..127.  Thus, reading 
patch.sysex[index] may yield negative numbers.  I had to compensate in 
my CZModel.getByte.
* Java ints are only 4 bytes, so you can't grab any more than that at 
once.  Ints are also signed, so if you grab 4 bytes, you'll get negative 
numbers again.  Longs are 8 bytes.

-Bill