控件的移动、改变大小（DELPHI实现）

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    procedure Panel1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure Panel1MouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
 releasecapture;
  if (x>=0)and(x<=3) then
  begin
    if (y>=0)and(y<=3) then panel1.perform(wm_syscommand,$f004,0);
    if (y>3)and(y<panel1.height-3) then panel1.perform(wm_syscommand,$f001,0);
    if (y>=panel1.height-3)and(y<=panel1.height) then panel1.perform(wm_syscommand,$f007,0);
  end
  else if (x>3)and(x<panel1.width-3) then
  begin
    if (y>=0)and(y<=3) then panel1.perform(wm_syscommand,$f003,0);
    if (y>3)and(y<panel1.height-3) then panel1.perform(wm_syscommand,$f012,0);
    if (y>=panel1.height-3)and(y<=panel1.width) then panel1.perform(wm_syscommand,$f006,0);
  end
  else if (x>=panel1.width-3)and(x<=panel1.width) then
  begin
    if (y>=0)and(y<=3) then panel1.perform(wm_syscommand,$f005,0);
    if (y>3)and(y<panel1.height-3) then panel1.perform(wm_syscommand,$f002,0);
    if (y>=panel1.height-3)and(y<=panel1.width) then panel1.perform(wm_syscommand,$f008,0);
  end;
end;

procedure TForm1.Panel1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
if (x>=0)and(x<=3) then
  begin
    if (y>=0)and(y<=3) then panel1.cursor:=crsizenwse;
    if (y>3)and(y<panel1.height-3) then panel1.cursor:=crsizewe;
    if (y>=panel1.height-3)and(y<=panel1.height) then panel1.cursor:=crsizenesw;
  end
  else if (x>3)and(x<panel1.width-3) then
  begin
    if (y>=0)and(y<=3) then panel1.cursor:=crsizens;
    if (y>3)and(y<panel1.height-3) then panel1.cursor:=crarrow;
    if (y>=panel1.height-3)and(y<=panel1.width) then panel1.cursor:=crsizens;
  end
  else if (x>=panel1.width-3)and(x<=panel1.width) then
  begin
    if (y>=0)and(y<=3) then panel1.cursor:=crsizenesw;
    if (y>3)and(y<panel1.height-3) then panel1.cursor:=crsizewe;
    if (y>=panel1.height-3)and(y<=panel1.width) then panel1.cursor:=crsizenwse;
  end;
end;

end.