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unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, ADODB;

type
  TForm2 = class(TForm)
    ADOConnection1: TADOConnection;
    Button1: TButton;
    Button2: TButton;
    procedure FormCanResize(Sender: TObject; var NewWidth, NewHeight: Integer; var Resize: Boolean);
    procedure FormCreate(Sender: TObject);
  private
    VH:Double;
    FIsInResize:Boolean;
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.FormCanResize(Sender: TObject; var NewWidth, NewHeight: Integer; var Resize: Boolean);
var
 w,h:Integer;
begin
  if FIsInResize then exit;
  try
    FIsInResize := true;
    w := width;
    h := Height;
    ScaleBy(NewWidth,w);
    NewHeight := Round(NewWidth / vh);
  finally
    FIsInResize := false;
  end;

end;

procedure TForm2.FormCreate(Sender: TObject);
begin
  vh := Width/Height;
end;

end.                    

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|     |
|X X X|
|_____|                    

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procedure TForm1.FormCanResize(Sender: TObject; var NewWidth,
  NewHeight: Integer; var Resize: Boolean);
  var
  w,h:Integer;
begin
 if FIsInResize then exit;
  try
    FIsInResize := true;
    w := width;
    h := Height;
    if vh<1 then
        begin
          ScaleBy(NewHeight,h);
          NewWidth := Round(NewHeight * vh);
        end
    else
        begin
          ScaleBy(NewWidth,w);
          NewHeight := Round(NewWidth / vh);
        end;

  finally
    FIsInResize := false;
  end;
end;