[fpc-devel] Interface delegation fix: backport to FPC 2.4.2 ...?

Luiz Americo Pereira Camara luizmed at oi.com.br
Thu May 20 19:16:47 CEST 2010

Michael Van Canneyt escreveu:
> On Thu, 20 May 2010, Florian Klaempfl wrote:
>> I've no opinion if it's usefull to add or not, I use TPersistent+ too
>> little but my concern is: if I create an observer for an instance, I'd
>> expect to get notified about every change to the instance. But I cannot
>> see how this will be achieved, no existing class is prepared for this?
> Not every change. What you get notified about is defined by the class
> that uses the observable interface. TStrings will notify you of 
> additions/removals, and TList/TObjectList as well. 

It will send some kind of info (like index or address of the object) to 
know what and where the item was added or removed?

Can the same Obsever observe (:-D) more than of one type of object? e.g. 
i want to observe a object list for adding or removals, but also want to 
know if one of the child objects changed.

(I use something like this in one of my works)


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