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How do I inherit a Form? 3 years 3 months ago #15384

Roman
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I need to implement almost the same interface in several projects. I want to create a base form class with immutable components, and then in the application make a form inheriting from this class, adding the necessary components (and inheriting the "base").
I create a module "my_form" in which I write:

{ TCommonForm }
 TCommonForm = class(TForm)
  procedure FormCreate(Sender : TObject);
 private

 public

 end;

In the main module, I do this:

{ TForm1 }
 TForm1 = class(TCommonForm)
  procedure FormCreate(Sender : TObject);
 private

 public

 end;

and

procedure TForm1.FormCreate(Sender : TObject);
begin
  inherited;
end;

This code compiles fine, the call to the inherited FormCreate method is done, the visual form editor works - everything is fine as intended. But this only works until IDE is closed or my project is closed. If I try to open this project with this description of my form, IDE hangs and then falls.

How can I properly inherit my form from my class, and not from the standard class TForm, in order to keep the form visually editable in the editor?

I am assuming that IDE and the compiler run at different times, so it would be possible to use the conditional compilation directives {$if}-{$else}, but this requires having a predefined macro that exists for "IDE"-time and does not exist for the compiler-time, for example:

{$if defined(IS_IDE_WORK)} // do not work!!! I figured it out later and corrected the message.
TForm1 = class(TForm)
{$else}
TForm1 = class(TCommonForm}
{$endif}

~~Is there such a predefined macro?~~

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Last edit: by Roman.

How do I inherit a Form? 3 years 3 months ago #15385

Sternas Stefanos Offline Moderator Ex Pilot, M.Sc, Ph.D Posts: 4508 Thank you received: 1100	My suggestion, try to create your form in runtime manual. Modules can handle only some of CT Components PilotLogic Architect and Core Programmer
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How do I inherit a Form? 3 years 3 weeks ago #15712

𝓚𝓸𝓭𝓮𝓩𝔀𝓮𝓻𝓰
Offline
Junior Member
I do love ObjectPascal and WinApi
Posts: 20
Thank you received: 2

Untested but maybe possible with CT, Intercept the Unit and add whatever you like as base values/settings.
How-To:
create a unit called Interceptor.pas.

(*
 *** KodeZwergs Interceptor Example ***
  copy "Interceptor.pas" into your Path where it's accessible from everywhere.
  must be included as last "Uses" statement in "Interface" section to let it work automagically.
*)

unit Interceptor;

interface

uses
  Forms;

type
  { interceptor class for TForm }
  TForm = class(Forms.TForm)
  protected
  private
  public
    constructor Create(AOwner: TComponent); override;
  public
  end;

implementation

constructor TForm.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
// add more code here
end;

initialization

end.

This way you can tweak TForm to whatever you want it to be.
Or add own methods to it, or or or....

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Last edit: by 𝓚𝓸𝓭𝓮𝓩𝔀𝓮𝓻𝓰.

How do I inherit a Form? 3 years 3 weeks ago #15714

𝓚𝓸𝓭𝓮𝓩𝔀𝓮𝓻𝓰 Offline Junior Member I do love ObjectPascal and WinApi Posts: 20 Thank you received: 2	i completely forgot to mention that you can also make something different out of a TForm this way, the limitation of the possibilities is only in the imagination.
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How do I inherit a Form?