[fpc-devel]TDataModul

[Michael.VanCanneyt at Wisa.be]

On Sat, 28 Dec 2002, [ISO-8859-1] Sebastian Günther wrote:

> Michael.VanCanneyt at wisa.be schrieb:
> >
> > Personally, I don't understand why it should be in classes at all
> > except maybe for some action stuff, but if Delphi puts it there, then I
> > guess we'll have to do it too for compatibility's sake.
>
> TDataModule is a non-visual class, just a container for components (as
> you know anyway). So I think it's quite logical to put it into classes.pp

In that case the name 'TDataModule' is not really representative.
TComponentModule might be a better name. And then create a TDataModule
descendent.

>
> BTW, we have another problem: InitInheritedComponent. Currently it is
> not implemented in the FCL; fpGUI and fpWeb have their own
> implementation, but we urgently need a common (and portable)
> implementation for this function. Perhaps we should add a callback
> function which is responsible for reading components from a stream. (see
> fpgui.pp for an example, what has to be done. Basically: What extensions
> should the files have, and where should they be located. fpGUI actually
> uses the folders unit; perhaps we should finally add this to the FCL?)

As far as I can see, we need a function that returns a stream which contains
the component data. All the rest can be handled in a 'global' way; Only the
instancing of the stream is specific to the kind of streaming used.

For lazarus, this would probably be a memory stream which is instantiated
from the lazarus resources. For fpgui, this would be a file stream which
points to the .dfm file. A combined approach is possible, of course.

So, basically we need a callback which returns the appropriate stream to
instantiate the component ? Do I undertand this correct ?

Michael.