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type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure FormResize(Sender: TObject);
  private
    { Private-Deklarationen }
    procedure WMACTIVATE(var Msg: TMessage); Message WM_ACTIVATE;
    procedure WMNCHITTEST(var Msg: TWMNChittest); Message WM_NCHITTEST;
    procedure WMNCLBUTTONDOWN(var Msg: TMessage); Message WM_NCLBUTTONDOWN;
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

var
  bHit: Boolean;

procedure TForm1.WMNCHITTEST(var Msg: TWMNChittest);
var
  x,y: SmallInt;
  dc: HDC;
  rect: TRect;
begin
  DefaultHandler(Msg);
  x := Msg.XPos-Left;
  y := Msg.YPos-Top;
  GetWindowRect(Handle, rect);
  if (x <= width) and (x >= width-21)
    and (y >= 0) and
    (y <= GetSystemmetrics(SM_CYEDGE)+14) then
  begin
    bHit := TRUE;
  end
  else
    bHit := FALSE;
end;

procedure TForm1.WMNCLBUTTONDOWN(var Msg: TMessage);
begin
  if bHit = TRUE then Close
  else
    inherited;
end;

procedure TForm1.WMACTIVATE(var Msg: TMessage);
var
  rgn: HRGN;
  rect, btnrect: TRect;
  dc: HDC;
  szBuffer: array[0..255] of Char;
  bmp: TBITMAP;
  brush : HBRUSH;
begin
  if Msg.Msg = WM_ACTIVATE then
  begin
    dc := GetWindowDC(Handle);
    rect.Left := GetSystemmetrics(SM_CXEDGE);
    rect.Top := GetSystemmetrics(SM_CYEDGE);
    rect.Right := Form1.Width-GetSystemmetrics(SM_CYEDGE);
    rect.Bottom := Getsystemmetrics(SM_CYCAPTION)+GetSystemmetrics(SM_CYFRAME);
    try
      bmp := TBITMAP.Create;
      bmp.loadfromfile('.\MyButton.bmp');
      btnrect.Left := Width-21;
      btnrect.Top := rect.Top+1;
      brush := CreateSolidBrush(RGB(255,0,0));
      SelectObject(dc, brush);
      Rectangle(dc, rect.Left, rect.Top, rect.Right, rect.Bottom);
      StretchBlt(dc, btnrect.Left, btnrect.Top+2, bmp.Width, bmp.Height,
        bmp.Canvas.Handle, 0, 0, bmp.Width, bmp.Height, SRCCOPY);
      lstrcpy(szBuffer, 'Meine Fenstercaption');
      SetBkMode(dc, TRANSPARENT);
      SetTextColor(dc, RGB(255,255,255));
      DrawText(dc, szBuffer, lstrlen(szBuffer), rect, DT_CENTER or DT_VCENTER);
    finally
      bmp.Free;
    end;
      ReleaseDC(Handle, dc);
  end
  else
    Inherited;
  ReleaseDc(Handle, dc);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  PostMessage(Handle, WM_ACTIVATE, 0, 0);
end;

procedure TForm1.FormPaint(Sender: TObject);
begin
  SendMessage(handle, WM_ACTIVATE, 0 , 0);
end;

procedure TForm1.FormResize(Sender: TObject);
begin
  SendMessage(handle, WM_ACTIVATE, 0 , 0);
end;                    

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procedure TForm1.FormCreate(Sender: TObject);
begin
  PostMessage(Handle, WM_ACTIVATE, 0, 0);
  tmouse.Create;
  {m:tmouse}
  m.capture := GetWindowDC(Handle);
end;

procedure TForm1.FormPaint(Sender: TObject);
begin
  SendMessage(handle, WM_ACTIVATE, 0 , 0);
end;

procedure TForm1.FormResize(Sender: TObject);
begin
  SendMessage(handle, WM_ACTIVATE, 0 , 0);
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
 if ((m.CursorPos.X>10)and(m.CursorPos.X<200)and(m.CursorPos.y>1)and (m.CursorPos.y<200))
  then  {die editfelder sind nur zu testzwecken da}
   Edit1.Text:='ok'
  else
   Edit1.Text:='False';
 Edit2.Text:=inttostr(m.cursorpos.X);
 Edit3.Text:=inttostr(m.cursorpos.y);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
 m.Free;
end;                    

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procedure TForm1.WMNCHITTEST(var Msg: TWMNChittest);