step1 在窗体上打个矩形的洞｛鼠标可以穿透这个窗体｝
procedure MakeRectHole(Ctrl:TWinControl;Form:TForm);
var
Rgn1, Rgn2: HRGN;
begin
Rgn1 := CreateRectRgn(0,0, Form.Width, Form.Height);
Rgn2 := CreateRectRgn(Ctrl.Left, Ctrl.Top,Ctrl.Left+ Ctrl.Width,Ctrl.Top+ Ctrl.Height);
CombineRgn(Rgn1, Rgn1, Rgn2, RGN_DIFF);
SetWindowRgn(Form.Handle, Rgn1, TRUE);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
MakeRectHole(Panel1,Form1);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
BorderStyle:=BsNone;
WindowState:= wsMaximized;
end;procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture();
SendMessage(Panel1.Handle,WM_NCLBUTTONDOWN,HTCAPTION,0);
MakeRectHole(Panel1,Form1);
end;
无标题 但能拖拽
procedure TForm1.FormCreate(Sender: TObject);
begin
SetWindowLong(Handle, GWL_STYLE, GetWindowLong(Handle, GWL_STYLE) xor WS_CAPTION);
Height := ClientHeight;
end;