实现窗体随着鼠标移动(控件)--《用delphi开发共享软件》-15.1任务管理器

private  //窗体移动；
OldPos,NewPos:TPoint;
bMove:Boolean;

procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
bMove:=True;
OldPos:=ClientToScreen(Point(X,Y));
end;

procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
begin
if not bMove then Exit;
NewPos:=ClientToScreen(Point(X,Y));
Left:=Left+NewPos.X-OldPos.X;
Top:=Top+NewPos.Y-OldPos.Y;
OldPos:=NewPos;
end;

procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
bMove:=False;
end;　　

拓展：以此让一个控件可移动；

//变量
   isMouseDown : boolean ; //是否拖拽
    posX,posY : Integer; //拖动开始时候的坐标

procedure TForm1.edt2MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  isMouseDown := True;                         //告诉窗体我要拖了
  posX := Mouse.CursorPos.X  - edt2.Left ;   //记录开始的位置
  posY := Mouse.CursorPos.Y  - edt2.Top  ;   //
end;

procedure TForm1.edt2MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  if isMouseDown  then                          //鼠标是按下状态（要拖）
  begin
    edt2.Left := Mouse.CursorPos.X - posX ;   //新的位置
    edt2.Top := Mouse.CursorPos.Y - posY ;
  end;
end;

procedure TForm1.edt2MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  isMouseDown := False;                          //告诉窗体我拖完了
end;