[api-dev] HowTo Customize Number Formats

[Irné Barnard]

I'm trying to create some custom number formats for calc. In particular 
to fix issue 5930. I've already created some add-on functions to 
"format" numbers by converting them to strings and back. I'd like to 
create an extra format type (instead of conversion functions) in the 
properties dialog so the user could select this, instead of modifying 
the formula.

Unfortunately this would be my first attempt at this level of extension 
to OOo. Going through the API documentation I'm a bit confused by the 
*Number Format**** services, interfaces & constant. It appears to be 
impossible to add another number format type.

The one I want to add most is Engineering Format, which would be a 
variant on Scientific Format = 32. Could someone please give me an 
indication of how to go about this, or even if I'm on the right track. 
I'd prefer to write the extension in Java / sBasic ... but if needs must 
I can flip to C++, will just have to dust off that 10 year old part of 
my brain :-D .

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Regards Irné Barnard