在Delphi中实现任意形状的窗体

Form的TEXT：

object Form1: TForm1
  Left = 192
  Top = 107
  BorderStyle = bsNone
  Caption = 'Form1'
  ClientHeight = 348
  ClientWidth = 536
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = Button1Click
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 392
    Top = 152
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 432
    Top = 24
    Width = 17
    Height = 17
    Caption = 'Button2'
    TabOrder = 1
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 448
    Top = 40
    Width = 17
    Height = 17
    Caption = 'Button2'
    TabOrder = 2
    OnClick = Button3Click
  end
  object Button4: TButton
    Left = 464
    Top = 56
    Width = 17
    Height = 17
    Caption = 'Button2'
    TabOrder = 3
    OnClick = Button4Click
  end
end

各种不同的事件声名：

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    procedure WMmove(var Message: TWMNCHITTEST); Message WM_NCHITTEST;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMmove(var Message: TWMNCHITTEST);
begin
  Message.Result :=  HTCAPTION;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
R1,R2,R3,R4,R5: HRGN;
begin
  R1 := CreateEllipticRgn(0,0,Round(ClientWidth / 2),ClientHeight);
  R2 := CreateEllipticRgn(Round(ClientWidth / 2),0,ClientWidth,ClientHeight);
  R3 := CreateEllipticRgn(Round(ClientWidth / 4 ),Round(ClientHeight / 4 *3),Round(ClientWidth / 4 *3),ClientHeight);
  R4 := CreateRectRgn(0,0,0,0);
  R5 := CreateRectRgn(0,0,0,0);
  CombineRgn(R4,R2,R1,RGN_or);
  CombineRgn(R5,R4,R3,RGN_or);

  SetWindowRGN(Handle,R5,True);
  DeleteObject(R1);
  DeleteObject(R2);
  DeleteObject(R3);
  DeleteObject(R4);
  DeleteObject(R5);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  SendMessage(Handle,WM_SYSCOMMAND,SC_MINIMIZE,0);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  SendMessage(Handle,WM_SYSCOMMAND,SC_DEFAULT,0);
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  Application.Terminate;
end;

end.