unit Unit1;

 interface

 uses

   System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,

   FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Objects;

 type

   TForm1 = class(TForm)

     Image1: TImage;

     procedure Image1MouseMove(Sender: TObject; Shift: TShiftState; X,

       Y: Single);

     procedure FormCreate(Sender: TObject);

     procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;

       Shift: TShiftState; X, Y: Single);

     procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;

       Shift: TShiftState; X, Y: Single);

     procedure FormShow(Sender: TObject);

   private

     { Private declarations }

   public

     { Public declarations }

   end;

 var

   Form1: TForm1;

 implementation

 {$R *.fmx}

 var IsDrag: Boolean;

 procedure TForm1.FormShow(Sender: TObject);

 begin

   Self.BorderStyle := TFmxFormBorderStyle.None; //窗体样式

   Image1.WrapMode := TImageWrapMode.Stretch; //图片加载方式

 end;

 procedure TForm1.FormCreate(Sender: TObject);

 begin

   IsDrag := False;

 end;

 procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;

   Shift: TShiftState; X, Y: Single);

 begin

   if ssLeft in Shift then

   begin

     IsDrag := True;

   end;

 end;

 procedure TForm1.Image1MouseMove(Sender: TObject; Shift: TShiftState; X,

   Y: Single);

 begin

   if IsDrag = True then

     Self.StartWindowDrag

   else

   begin

     //

   end;

 end;

 procedure TForm1.Image1MouseUp(Sender: TObject; Button: TMouseButton;

   Shift: TShiftState; X, Y: Single);

 begin

   IsDrag := False;

 end;

 end.