Other Library functions exposure

S

sorex

Expert

Licensed User

Longtime User

• Jul 2, 2020

• #1

Hello,

I have a lot of classes that are almost or completely identical between projects.

I'm thinking about making small libs of them.

I was wondering how the exposure of functions, variables etc is done by just calling the library name.

A good example is B4XPages where you can access everything by just using B4XPages.xxx from in any class without declaring an object first.

 

agraham

Expert

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Longtime User

• Jul 2, 2020

• #2

B4XPages is a code module. In general Erel deprecates the use of code modules and recommends classes instead. On the other hand, for what you envisage a code module does seem appropriate.

 

S

sorex

Expert

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Longtime User

• Jul 2, 2020

• #3

Is he then using a mixture of a code module and classes?

you can't have variables like activity, panels etc in a code module's Globals so he must store it somewhere else.

 

agraham

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Longtime User

• Jul 2, 2020

• #4

sorex said:

Is he then using a mixture of a code module and classes?

Click to expand...

Yes. B4XPages code module basically forwards stuff to B4XPagesManager class. B4XPagesManager implents all the functionality and B4XPages is meant to be the public API of B4XPages exposing only what Erel deems needed.

 

S

sorex

Expert

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Longtime User

• Jul 2, 2020

• #5

Interesting.

I'll do some testing with this.

Thanks for the info.

 

Erel

B4X founder

Staff member

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• Jul 2, 2020

• #6

Note that you can unzip B4XPages.b4xlib and see the source code.

 

S

sorex

Expert

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Longtime User

• Jul 2, 2020

• #7

Thanks for the hint, Erel.

Needless to say that it was very interesting material.

But it also contains a big mistery (for me atleast).

How on earth did you manage to write the lines that reference the B4XMainPage class when that class didn't even exist yet in your B4Xlibrary file?

Or was that class as dummy added and after compilation removed from the jar/b4xlib files?

 

agraham

Expert

Licensed User

Longtime User

• Jul 2, 2020

• #8

sorex said:

Or was that class as dummy added and after compilation removed from the jar/b4xlib files?

Click to expand...

A B4XLib library is not compiled, it is just a set of source code files that are merged when the IDE compiles the project