mainfrm.pas

来自「Delphi面向对象编程思想附书源码 好用哦！」· PAS 代码 · 共 59 行

unit MainFrm;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    ListBox1: TListBox;
    Label1: TLabel;
    StaticText1: TStaticText;
    Bevel1: TBevel;
    Label2: TLabel;
    Edit2: TEdit;
    LabeledEdit1: TLabeledEdit;
    procedure ControlMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure ListBox1DragDrop(Sender, Source: TObject; X, Y: Integer);
    procedure ListBox1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.ControlMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
 if Button=mbLeft then
  TControl(sender).BeginDrag(False,10);
end;

procedure TForm1.ListBox1DragDrop(Sender, Source: TObject; X, Y: Integer);
begin
  if  Source is TCustomEdit then
    ListBox1.Items.Add((Source as TCustomEdit).Text) ;
  if  Source is TLabel then
    ListBox1.Items.Add((Source as TLabel).Caption);
end;

procedure TForm1.ListBox1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
   Accept:=(Source is TControl);
end;

end.