DelphiXE8FMX工程实现无边框托动(FMX内部方法)

注意：

可以实现效果，但不知道我的用法对不对(或着说是不是最优化的用法)，望高手们指教。

实例代码：

 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.