Re: Subtree array purpose

[Jeff Morriss <jeff.morriss.ws () gmail com>]

Max wrote:
> Can anybody please explain the purpose of subtree array (ett_...)?
>
> I don't get why should i have several different etts in my dissector's
> code, while there is no information assotiated with these integers.

Each ett_ stores information about whether the particular subtree 
created using that variable is expanded or not.

For example, if a GUI user expands subtree B (but not A or C) and if the 
3 subtrees use different ett_ variables then when the user clicks on the 
next packet then only subtree B will be automatically expanded.  I find 
this behavior extremely useful when I'm comparing information (hanging 
off that subtree) between packets.

If OTOH only one ett_ variable is used for all 3 subtrees then all 3 
subtrees in the next packet will be either expanded or collapsed 
(depending on the last action of the user on the last packet--whether 
they last expanded a subtree or collapsed one).
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