about.pas

《Kylix程序设计》一书中附带的例程源代码

unit About;

interface

uses
  SysUtils, Types, Classes, QGraphics, QControls, QForms, QDialogs,
  QExtCtrls, QButtons, QStdCtrls;

type
  TAboutbox = class(TForm)
    AboutPanel: TPanel;
    ProgramIcon: TImage;
    ProductName: TLabel;
    Version: TLabel;
    Copyright: TLabel;
    OKButton: TButton;
    LblComments: TLabel;
    BtnMore: TButton;
    procedure FormCreate(Sender: TObject);
    procedure BtnMoreClick(Sender: TObject);
  private
    { Private declarations }
    FLeft: Integer;
    FTop: Integer;
    FFullHeight: Integer;
    FHalfHeight: Integer;
    FMore: Boolean;
  public
    { Public declarations }
  end;
{
var
  Aboutbox: TAboutbox;
}

implementation

{$R *.xfm}

procedure TAboutbox.FormCreate(Sender: TObject);
begin
  FLeft := Left;
  FTop := Top;
  FHalfHeight := 130;
  FFullHeight := 190;
  ClientHeight := FHalfHeight;
  FMore := true;
  BtnMore.Caption := 'More >>';
end;

procedure TAboutbox.BtnMoreClick(Sender: TObject);
var
  i: Integer;
begin
  Left := FLeft;
  Top := FTop;
  if FMore then
  begin
//    ClientHeight := FFullHeight;
    for i := FHalfHeight to FFullHeight do
      ClientHeight := i;
    BtnMore.Caption := 'Less <<';
  end
  else
  begin
//    ClientHeight := FHalfHeight;
    for i := FFullHeight downto FHalfHeight do
      ClientHeight := i;
    BtnMore.Caption := 'More >>';
  end;
  FMore := not FMore;
end;

end.