Задачи в Windows Forms

Перемещение кнопки

unit Unit1;

interface

uses System, System.Drawing, System.Windows.Forms;

type
  Form1 = class(Form)
    procedure Move_MouseDown(sender: Object; e: MouseEventArgs);
    procedure Move_MouseMove(sender: Object; e: MouseEventArgs);
  {$region FormDesigner}
  private 
    {$resource Unit1.Form1.resources}
    {$include Unit1.Form1.inc}
    {$endregion FormDesigner}
  public 
    Loc: Point;
    
    constructor;
    begin
      InitializeComponent;
    end;
  end;

implementation

procedure Form1.Move_MouseDown(sender: Object; e: MouseEventArgs);
begin
  if e.Button = System.Windows.Forms.MouseButtons.Left then
    Loc := e.Location;
end;

procedure Form1.Move_MouseMove(sender: Object; e: MouseEventArgs);
begin
  var btn := sender as Button;
  if e.Button = System.Windows.Forms.MouseButtons.Left then
  begin
    btn.Left += e.X - Loc.X;
    btn.Top += e.Y - Loc.Y;
  end;
end;
end.