Gotchya with sigslot library

Hello all,

I'm using the sigslots library separately in a project and I came across 
this gotchya. Now, this is probably going to seem like common sense to you 
guys, but I'm just a beginner with sigslots so bear with me.

I've discovered you cannot connect to a slot that is a function defined as 
a prototype function of the slot object if more than one of that type of 
object exists.

This is because, as a prototype function the FP is identical for all 
objects of that type and the emitWithArgs function will apply the first 
connArr[fp] it finds which may or may not be the correct slot object.

Phew! Took a day to find that one.

Example:
===============
I have 2 tabRow objects each with 3 tab objects. A tab object has a 
'click' signal connected to its parent row's 'activateTab' slot. 
'activateTab' is defined as a prototype function of the tabRow class.

Problem is: When row #2's tabs are clicked row #1 get's the signal. This 
is because row #1 is instantiated first and thus it gets added to connArr 
first. Then when the tab does an emitWithArgs, if finds row #1's fp and 
finds that it matches every time.

So if defined like this there are problems:

tabRow.prototype.activateTab = function() {}

But change it to this and it works fine:

function tabRow() {
        ...
        this.activateTab = function() {}
}
===============

As I said it's probably common sense to you guys, but might be a common 
gotchya for punters like me. the class.prototype method of making 
object.methods is quite common (useful for inheritance).

Cheers,
Andrew Tetlaw

Bligh Voller Nield
http://www.bvn.com.au
p: (07) 3251 5778
f: (07) 3852 2544


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