URL highlighting in TRichEdit

Problem/Question/Abstract:

URL highlighting in TRichEdit

Answer:

This functionality is implemented in
RichEdit from Microsoft (and MS Outlook use this feature, for example) and
only Borland's developers didn't publish it for us.)

{....}

protected

procedure WndProc(var Message: TMessage); override;

{....}

uses Richedit, ShellApi;

procedure TForm1.FormCreate(Sender: TObject);
var
mask: Word;
begin
mask := SendMessage(RichEdit1.Handle, EM_GETEVENTMASK, 0, 0);
SendMessage(RichEdit1.Handle, EM_SETEVENTMASK, 0, mask or ENM_LINK);
SendMessage(RichEdit1.Handle, EM_AUTOURLDETECT, Integer(True), 0);

//Some text in RichEdit
RichEdit1.Text := 'Scalabium Software'#13#10 +
' Site is located at www.scalabium.com. Welcome to our site.';
end;

procedure TForm1.WndProc(var Message: TMessage);
var
p: TENLink;
strURL: string;
begin
if (Message.Msg = WM_NOTIFY) then
begin
if (PNMHDR(Message.lParam).code = EN_LINK) then
begin
p := TENLink(Pointer(TWMNotify(Message).NMHdr)^);
if (p.Msg = WM_LBUTTONDOWN) then
begin
SendMessage(RichEdit1.Handle, EM_EXSETSEL, 0, Longint(@(p.chrg)));
strURL := RichEdit1.SelText;
ShellExecute(Handle, 'open', PChar(strURL), 0, 0, SW_SHOWNORMAL);
end
end
end;

inherited;
end;