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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 關於類的入門的例子(6): 類引用示例

關於類的入門的例子(6): 類引用示例

編輯:Delphi

unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  RadioGroup1: TRadioGroup;
  procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
   Shift: TShiftState; X, Y: Integer);
  procedure FormCreate(Sender: TObject);
  procedure RadioGroup1Click(Sender: TObject);
 private
  { Private declarations }
 public
  { Public declarations }
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
var
 ClassRef: TControlClass; //TControlClass 是 TControl 的類引用
procedure TForm1.FormCreate(Sender: TObject);
begin
 RadioGroup1.Width := 300;
 RadioGroup1.Columns := 3;
 RadioGroup1.Items.Add('Button');
 RadioGroup1.Items.Add('Edit');
 RadioGroup1.Items.Add('Lable');
 RadioGroup1.ItemIndex := 0;
 ClassRef := TButton;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
 case RadioGroup1.ItemIndex of
  0: ClassRef := TButton;
  1: ClassRef := TEdit;
  2: ClassRef := TLabel;
 end;
end;
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
 Shift: TShiftState; X, Y: Integer);
var
 NewCtrl: TControl;
begin
 NewCtrl := ClassRef.Create(Self);
 NewCtrl.Name := ClassRef.ClassName + IntToStr(Self.ControlCount);
 NewCtrl.Parent := Self;
 NewCtrl.Left := X;
 NewCtrl.Top := Y;
end;
end.


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