type
TForm1 = class(TForm)
private
{ Private declarations }
procedure WmNCHitTest(var Msg : TWMNCHitTest); message WM_NCHITTEST;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.WmNCHitTest(var Msg: TWMNCHitTest);
const v=3; //border width
var p:TPoint;
begin
Inherited;
p:=Point(Msg.XPos,Msg.YPos);
p:=ScreenToClient(p);
if PtInRect(Rect(0,0,v,v),p) then
Msg.Result:=HTTOPLEFT
else if PtInRect(Rect(Width-v,Height-v,Width,Height),p) then
Msg.Result:=HTBOTTOMRIGHT
else if PtInRect(Rect(Width-v,0,Width,v),p) then
Msg.Result:=HTTOPRIGHT
else if PtInRect(Rect(0,Height-v,v,Height),p) then
Msg.Result:=HTBOTTOMLEFT
else if PtInRect(Rect(v,0,Width-v,v),p) then
Msg.Result:=HTTOP
else if PtInRect(Rect(0,v,v,Height-v),p) then
Msg.Result:=HTLEFT
else if PtInRect(Rect(Width-v,v,Width,Height-v),p) then
Msg.Result:=HTRIGHT
else if PtInRect(Rect(v,Height-v,Width-v,Height),p) then
Msg.Result:=HTBOTTOM
else
Msg.Result:=HTCAPTION;
end;