BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TCollection          BorlandTalk.com Forum Index -> Delphi VCL Components Writing View previous topic :: View next topic   Author Message Matthijs ter Woord Guest Posted: Wed Aug 27, 2003 4:31 pm    Post subject: TCollection Hi i want to create a component which has a TCollection property. in that collection i want to store TMyCollectionItem descendants. how do i make clear to the object inspector to show a list of available descendant classes? Matthijs ter Woord Back to top Robert Cerny Guest Posted: Tue Sep 02, 2003 8:11 pm    Post subject: Re: TCollection You can't. TCollection can't be polymorphic, which means it can handle only one class of items. -- Robert Cerny http://codecentral.borland.com/codecentral/ccWeb.exe/author?authorid=18355 "Matthijs ter Woord" <matthijs (AT) terwoord (DOT) nl> wrote Quote: I want to create a component which handles TRegistry settings in the component you have to add an item for each setting you want: DatabaseServer: TMyStringItem MaxProgramInstanceCount: TMyIntegerItem TMyStringItem: + Has OnValidate Event + Has Mask property + Has PasswordChar property etc TMyIntegerItem: + Has OnValidateEvent + Has Min property + Has Max property etc how to accomplish this Back to top Matthijs ter Woord Guest Posted: Wed Sep 03, 2003 12:21 pm    Post subject: Re: TCollection Quote: You can't. is there another way to do this? Matthijs ter Woord Back to top Robert Cerny Guest Posted: Thu Sep 04, 2003 11:59 am    Post subject: Re: TCollection Of course, there is always another way, at least two for this case. One is to create a superset collectionitem (item that has all properties for all needed types), with default values for properties it would not weight much. Another is to have list of items, but you would have to handle streaming and create a custom property editor. -- Robert Cerny http://codecentral.borland.com/codecentral/ccWeb.exe/author?authorid=18355 "Matthijs ter Woord" <matthijs (AT) terwoord (DOT) nl> wrote Quote: You can't. is there another way to do this? Matthijs ter Woord Back to top Matthijs ter Woord Guest Posted: Thu Sep 04, 2003 1:37 pm    Post subject: Re: TCollection so no standard delphi stuff? Matthijs ter Woord "Robert Cerny" <robert.qwe.cerny (AT) neosys (DOT) xrs.qwe.si> schreef in bericht news:bj7ggi.2rk.1 (AT) neosys (DOT) xrs.si... Quote: Of course, there is always another way, at least two for this case. One is to create a superset collectionitem (item that has all properties for all needed types), with default values for properties it would not weight much. Another is to have list of items, but you would have to handle streaming and create a custom property editor. -- Robert Cerny http://codecentral.borland.com/codecentral/ccWeb.exe/author?authorid=18355 "Matthijs ter Woord" <matthijs (AT) terwoord (DOT) nl> wrote in message news:3f55dc51 (AT) newsgroups (DOT) borland.com... You can't. is there another way to do this? 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