TRichEdit实现URL

TRichEdit实现URL

Author: Mike Shkolnik

{....}

protected

procedure WndProc(var Message: TMessage); override;

　

{....}

　

uses Richedit, ShellApi;

{Today I want to show how to implement URL highlighting and URL navigation

without any third-party components. 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.}

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;