Hi,
Thank you, Joost, Niklas and Bjoern.
It's still abit abstract for me. I know SlotIDs are constants defined
in .hrc files, e.g., sc.hrc. What about WhichIDs?
Could you please give me a simple example to illustrate the relationship
between "module", "item", "whichId" and "SlotId"?
>From Niklas' explanation, I sense each module have a range of WhichIDs.
What does "module" means here? Does it mean the application module? ie,
Writer, calc, impress and so on. "an ItemPool can define a Slot-ID for
each Which-ID. The same Slot-ID is then used for an item across the
modules", I can't understand the above explanation. Different module
have different WhichIDs. How can it use same SlotID? Does it define the
same SlotID for different WhichID in different modules?
I havn't finised reading the article Bjoern provided. Maybe I can get
more from the article.
Thank you again for the help. I just dig into the source code and know
very little about it now. Please don't feel boring.
Best regards,
Lihua
在 2009-08-05三的 09:30 +0000，Bjoern Michaelsen写道：
> Zhu Lihua <zhulihua <at> redoffice.com> writes:
>
> >
> > Hi all,
> >
> > I read the following code in OOo source code(itempool.hxx):
> >
> > #define SFX_WHICH_MAX 4999
> >
> > static int IsWhich(USHORT nId) {
> > return nId && nId <= SFX_WHICH_MAX; }
> > static int IsSlot(USHORT nId) {
> > return nId && nId > SFX_WHICH_MAX; }
> >
> > I think: if nId > 4999, it's a "Slot". if nId <= 4999 and nId !=0 , it's a
> "Which".
> >
> > What are the terms "slot" and "which" mean?
> > Thank you!
>
> A WhichId is the id by which items are stored in SfxItemSets and SfxItemPools.
> You cannot have two items with the same WhichId in on SfxItemSet. However,
> there are multiple uses for WhichIds: SfxSlotIds are only one and they are
> required to start at 5000. In writer for example HintIds can also be used
> as WhichIds. To make sure those do not collide, HintIds must be <5000.
>
> SlotIds are used in the Sfx2 framework. see:
>
>
> http://wiki.services.openoffice.org/wiki/Framework/Article/Implementation_of_the_Dispatch_API_In_SFX2
>
> SlotIds are at least unique per Shell (*).
>
> There are some fine differences in the way SfxItemSets/SfxPropertySets handle
> ids <5000 and ids >=5000. For example, the Changed(..)-Callback in SfxItemSet
> only gets called for WhichIds <5000. For more details, Im afraid you will have
> to dig into the code.
>
> Have Fun,
>
> Bjoern
>
>
> (*) I guess, they might even be unique OOo-wide, but Im not sure about that.
>
>
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