Re: [UOPL-Architect] how design uopl gui applications
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Re: [UOPL-Architect] how design uopl gui applications
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From: Dennis L. <de...@de...> - 2004-12-07 18:46:05
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OK.
I just had a look at the D7 implementations of tInterfacedPersisent and
tComponent. There have been quite a few changes since D5.
TComponent and TInterfacedPersistent are declared, respectively:
TComponent = class(TPersistent, IInterface, IInterfaceComponentReference)
and
TInterfacedPersistent = class(TPersistent, IInterface)
The definition of IInterface is
IInterface = interface
['{00000000-0000-0000-C000-000000000046}']
function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
function _AddRef: Integer; stdcall;
function _Release: Integer; stdcall;
end;
IOW, both classes have functional parity in regard to the QueryInterface
functionality (They share IInterface).
We simply need to duplicate these on the FreePascal side. (This is assuming
the FP support interfaces at all, otherwise its all moot).
We can leave the choice up to individual developers wether or not to descend
from TInterfacedPersistent or TPersistent, we should just alert them to the
benefit of using TInterfacedPersistent. If they descend from tComponent,
then they automatically get the "IInterface" functionality for free...
So you get all this for free, if you use D7 as the "porting target".
(Another issue, I suppose).
Dennis Landi
Allied Data, Inc.
800 204 2722
http://www.dennislandi.com
----- Original Message -----
From: "Dennis Landi" <de...@de...>
To: <uop...@li...>
Sent: Tuesday, December 07, 2004 1:02 PM
Subject: Re: [UOPL-Architect] how design uopl gui applications
>
>
> > True, but I think the point that was trying to be made is that these
> > private variables often
> > get surfaced as Public properties.
>
> You would do that in descendants.
>
> That has nothing to do with the TComponentClass classtype which is the
> typecast, and all the streaming mechanism sees.
>
>
> Dennis Landi
> Allied Data, Inc.
> 800 204 2722
> http://www.dennislandi.com
> ----- Original Message -----
> From: "Thomas Miller" <tm...@bs...>
> To: <uop...@li...>
> Sent: Tuesday, December 07, 2004 12:24 PM
> Subject: Re: [UOPL-Architect] how design uopl gui applications
>
>
> We could have both Owner and
> > OwnerInterface as
> > a property or function.
> >
> > I think the sooner we work some of these little detail out and can start
> > the CVS tree,
> > the better. I will continue working on website stuff for you.
> >
> > Dennis Landi wrote:
> >
> > >>By the way, couldn't we have both an FOwner and FOwnerInterface?
> > >>
> > >>
> > >>
> > >
> > >Private fields shouldn't interfere with the RTTI streaming system at
all.
> I
> > >doubt its an issue, but the experiment needs to happen.
> > >
> > >Three or four years ago I created my own tInterfacedComponent. I'll
see
> if
> > >I can find it.
> > >
> > >Dennis Landi
> > >Allied Data, Inc.
> > >800 204 2722
> > >http://www.dennislandi.com
> > >
> > >
> > >
> > >
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> > --
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> > Wash DC Delphi SIG Chairperson
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> >
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>
>
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