BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to limit droped components          BorlandTalk.com Forum Index -> Delphi VCL Components Writing View previous topic :: View next topic   Author Message murn Guest Posted: Wed Nov 12, 2003 12:16 pm    Post subject: How to limit droped components How to limit components that are droped on my component in design time? I tryed : procedure TMyComponent.Notification(AComponent: TComponent; Operation: TOperation); begin if csDesigning in ComponentState then if Operation = opInsert then if (AComponent.ClassName <> 'TMy2ndComponent') then begin MessageBox(Application.Handle,PChar('Not allowed!'),PChar('Error !'),MB_OK); AComponent.Free; end; inherited Notification(AComponent,Operation); end; ;but this couses access violation. Regards Milos Back to top Maris Janis Vasilevskis Guest Posted: Wed Nov 12, 2003 1:54 pm    Post subject: Re: How to limit droped components Notification is called from TMy2ndComponent.Create, so it is not ready for Free yet. Raise exception. Mahris murn wrote: Quote: How to limit components that are droped on my component in design time? I tryed : procedure TMyComponent.Notification(AComponent: TComponent; Operation: TOperation); begin if csDesigning in ComponentState then if Operation = opInsert then if (AComponent.ClassName <> 'TMy2ndComponent') then begin MessageBox(Application.Handle,PChar('Not allowed!'),PChar('Error !'),MB_OK); AComponent.Free; end; inherited Notification(AComponent,Operation); end; ;but this couses access violation. Regards Milos Back to top Marc Rohloff Guest Posted: Wed Nov 12, 2003 2:05 pm    Post subject: Re: How to limit droped components On Wed, 12 Nov 2003 13:16:40 +0100, murn<miloo (AT) email (DOT) si> said ... Quote: How to limit components that are droped on my component in design time? Override the ValidateInsert method of TComponent and throw an exception. Marc Back to top murn Guest Posted: Fri Nov 14, 2003 8:05 am    Post subject: Re: How to limit droped components Hi, Quote: Override the ValidateInsert method of TComponent and throw an exception. I did ! Thank you all ! 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