unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    DXImageList1: TDXImageList;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{借用其他 VCL 控件加载图片}
procedure TForm1.FormCreate(Sender: TObject);
var
  pic: TPicture;
begin
  pic := TPicture.Create;
  pic.LoadFromFile('c:\Temp\Test.bmp');
  DXImageList1.Items.Add;
  DXImageList1.Items[0].Picture.Assign(pic);
  pic.Free;
end;

{这个代码貌似简单, 但代码提示不好}
procedure TForm1.Button1Click(Sender: TObject);
begin
  Self.Refresh;
  Self.Canvas.Draw(0, 0, DXImageList1.Items[0].Picture.Graphic);
end;

{使用 TPictureCollectionItem 对象中转一下, 写起来更顺手}
procedure TForm1.Button2Click(Sender: TObject);
var
  picItem: TPictureCollectionItem;
begin
  Self.Refresh;
  picItem := DXImageList1.Items[0];
  Self.Canvas.StretchDraw(ClientRect, picItem.Picture.Graphic);
end;

end.