[Lazarus] How do you create some kind of type definition based on adding a set if identical functions to different objects with different ancestors?

Frank Church vfclists at gmail.com
Fri Nov 19 08:50:01 CET 2010

On 17 November 2010 10:39, Frank Church <vfclists at gmail.com> wrote:

> I don't know whether interfaces are what I am looking for here.
> I am creating an object called TStateInfoSource which needs to display its
> state using different objects, mainly a TForm, a TFrame, some future
> TComponent based visual object and a  web interface as yet undecided.
> eg, both the TForm, the TFrame and web object are to implement a function
> called DisplayState in their own way.
> Is there some way to create some kind of type definition called a
> TImplementsDisplayState so that TStateInfoSource can call the DisplayState
> function of  TImplementsDisplayState object it is associated with at
> runtime?
> In effect the TImplementsDisplayState facility is added or associated with
> existing objects, rather then having TForm, TFrame etc as its sub properties
> or components. In this way the display code is implemented directly by the
> form or frame, rather than having the TImplementsDisplayState object
> manipulate the form or frame's elements directly.
> In effect is it possible to put a group of unrelated objects into the same
> type definition by adding to them a set of identically defined functions?
> --
> Frank Church
> =======================
> http://devblog.brahmancreations.com

I think interfaces are what I need here. I'm going to do some more reading.

Frank Church

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