BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OOP & Visual Component & Object inspector          BorlandTalk.com Forum Index -> Delphi OO design View previous topic :: View next topic   Author Message Maziar Guest Posted: Thu Jan 13, 2005 7:20 pm    Post subject: OOP & Visual Component & Object inspector Hi I have one question : I try write FULL OOP program with Delphi I define one class base of my APP : unit uMainDB TMainDB = class(TDataModule) private //some code public IBD : TIBDatabase; end; unit uDataTable1 uses uA,uMainDB; TIBT1 = class(TDataModule) private //some code public IBT1 : TIBDataset end; unit uA; uses uMainDB; TAPP = class(TDataModule) private //some code public MainDB : TMainDB; //some other code; end; var APP : TAPP; I never define public var in uMainDB; I no understand why in design time in object inspector for IBT1(TIBDataset) can not link database property in to APP.MainDB.IBD ? (in only can in run time) ? Back to top Kyle A. Miller Guest Posted: Thu Jan 13, 2005 7:45 pm    Post subject: Re: OOP & Visual Component & Object inspector Maziar wrote: Quote: I no understand why in design time in object inspector for IBT1(TIBDataset) can not link database property in to APP.MainDB.IBD ? (in only can in run time) ? Does App.MainDB exist at design time? It can't because you don't create it till run-time. The form designer can't link to something that doesn't exist yet. You might try, though I haven't tested, to wrap TApp into a TComponent and expose MainDB as a published property. Create TApp in the creation of your TComponent. Back to top Maziar Guest Posted: Thu Jan 13, 2005 8:00 pm    Post subject: Re: OOP & Visual Component & Object inspector can do me more comment seem OOdesign have some conflict with visual relation ? "Kyle A. Miller" <kyle@millerdevelopment##remove#.info> wrote Quote: Maziar wrote: I no understand why in design time in object inspector for IBT1(TIBDataset) can not link database property in to APP.MainDB.IBD ? (in only can in run time) ? Does App.MainDB exist at design time? It can't because you don't create it till run-time. The form designer can't link to something that doesn't exist yet. You might try, though I haven't tested, to wrap TApp into a TComponent and expose MainDB as a published property. Create TApp in the creation of your TComponent. Back to top Joanna Carter (TeamB) Guest Posted: Fri Jan 14, 2005 10:06 am    Post subject: Re: OOP & Visual Component & Object inspector "Maziar" <mnavahan (AT) yahoo (DOT) com> a écrit dans le message de news: [email]41e6ca06 (AT) newsgroups (DOT) borland.com[/email]... Quote: I try write FULL OOP program with Delphi I define one class base of my APP : Quote: I no understand why in design time in object inspector for IBT1(TIBDataset) can not link database property in to APP.MainDB.IBD ? (in only can in run time) ? If you are trying to design a fully OO application then I don't see why you are deriving from TDataModule just to include one component. If components are not declared in the default visibility (published) then they are certainly not visible in the Object Inspector. Do you understand or do we need to explain further ? Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Maziar Guest Posted: Fri Jan 14, 2005 1:59 pm    Post subject: Re: OOP & Visual Component & Object inspector hi Joanna i need link IBT1(TIBDataset) database property in to IBD(TIBDatabase) in design time if move the IBT1 or IBD to published section no problem resolved ... how do visual realtion in this topic ? "Joanna Carter (TeamB)" <joanna (AT) nospam (DOT) co.uk> wrote Quote: "Maziar" <mnavahan (AT) yahoo (DOT) com> a écrit dans le message de news: [email]41e6ca06 (AT) newsgroups (DOT) borland.com[/email]... I try write FULL OOP program with Delphi I define one class base of my APP : I no understand why in design time in object inspector for IBT1(TIBDataset) can not link database property in to APP.MainDB.IBD ? (in only can in run time) ? If you are trying to design a fully OO application then I don't see why you are deriving from TDataModule just to include one component. If components are not declared in the default visibility (published) then they are certainly not visible in the Object Inspector. Do you understand or do we need to explain further ? Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Joanna Carter (TeamB) Guest Posted: Fri Jan 14, 2005 2:21 pm    Post subject: Re: OOP & Visual Component & Object inspector "Maziar" <mnavahan (AT) yahoo (DOT) com> a écrit dans le message de news: [email]41e7d034 (AT) newsgroups (DOT) borland.com[/email]... Quote: i need link IBT1(TIBDataset) database property in to IBD(TIBDatabase) in design time if move the IBT1 or IBD to published section no problem resolved ... how do visual realtion in this topic ? I have now asked you twice; why are you deriving from TDataModule ? Answer this and then we can progress further. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Kyle A. Miller Guest Posted: Fri Jan 14, 2005 3:51 pm    Post subject: Re: OOP & Visual Component & Object inspector Maziar wrote: Quote: can do me more comment seem OOdesign have some conflict with visual relation ? Or the OO design is flawed. I don't understand what you are trying to achieve with that design. Why do you need two database components? If you have one datamodule that is the "main" datamodule for the application, then why have another called TAPP? Back to top Maziar Guest Posted: Fri Jan 14, 2005 4:10 pm    Post subject: Re: OOP & Visual Component & Object inspector 1. what is problem if use base class Tdatamodule ? 2. because i need put some VCL in it ! (for example TIBDatabase) "Joanna Carter (TeamB)" <joanna (AT) nospam (DOT) co.uk> wrote Quote: "Maziar" <mnavahan (AT) yahoo (DOT) com> a écrit dans le message de news: [email]41e7d034 (AT) newsgroups (DOT) borland.com[/email]... i need link IBT1(TIBDataset) database property in to IBD(TIBDatabase) in design time if move the IBT1 or IBD to published section no problem resolved ... how do visual realtion in this topic ? I have now asked you twice; why are you deriving from TDataModule ? Answer this and then we can progress further. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Joanna Carter (TeamB) Guest Posted: Fri Jan 14, 2005 4:40 pm    Post subject: Re: OOP & Visual Component & Object inspector "Maziar" <mnavahan (AT) yahoo (DOT) com> a écrit dans le message de news: [email]41e7ef05 (AT) newsgroups (DOT) borland.com[/email]... Quote: 1. what is problem if use base class Tdatamodule ? Are you using the IDE wizard to create the data modules or are you writing them yourself in a new unit ? If you are writing it yourself, then you cannot expect the object inspector to work unless there is also a .dfm file which the IDE wizard automatically creates. Quote: 2. because i need put some VCL in it ! (for example TIBDatabase) Then why not use the visual designer and add as many of your components to one module as you need for one form, etc. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Quote: Back to top Maziar Guest Posted: Fri Jan 14, 2005 6:39 pm    Post subject: Re: OOP & Visual Component & Object inspector Quote: Then why not use the visual designer and add as many of your components to one module as you need for one form, etc. i do it but my qustion is clear : how crate link between my database and dataset usign designer please see my last post ... Back to top Bob Dawson Guest Posted: Sat Jan 15, 2005 2:22 am    Post subject: Re: OOP & Visual Component & Object inspector "Maziar" wrote Quote: how crate link between my database and dataset usign designer please see my last post ... Design time linking of components isn't really an oodesign topic. 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