MODULE dialog;

(* Press D for a form dialog, M for a message box, Esc to quit. *)

FROM InOut IMPORT WriteString, WriteLn;
IMPORT tv;

VAR e : tv.Event; quit : BOOLEAN; st : tv.ViewPtr;
    iName, iCity, cOn, rFast, rSafe, cmd : INTEGER;
    s, msg : ARRAY [0..127] OF CHAR;

BEGIN
    IF NOT tv.Init() THEN WriteString("not a tty"); WriteLn; HALT END;
    st := tv.NewView(tv.VText, 0, tv.Rows() - 1, tv.Cols(), 1);
    tv.SetText(st, " D: dialog   M: message box   Esc: quit");
    tv.AddView(tv.Desk(), st);
    tv.Finish;

    quit := FALSE;
    WHILE NOT quit DO
        IF tv.Resized() THEN tv.Finish END;
        IF tv.ReadEvent(e) THEN
            IF (e.kind = tv.evKey) AND (e.key = tv.kEsc) THEN
                quit := TRUE
            ELSIF (e.kind = tv.evKey) AND (e.key = tv.kChar) AND
                  ((e.ch = VAL(CARDINAL, ORD('d'))) OR (e.ch = VAL(CARDINAL, ORD('D')))) THEN
                tv.Dialog("Options", 44, 12);
                iName := tv.DlgInput("Name:", "Modula-2");
                iCity := tv.DlgInput("City:", "Paris");
                cOn := tv.DlgCheck("Enabled", TRUE);
                rFast := tv.DlgRadio("Fast mode", TRUE);
                rSafe := tv.DlgRadio("Safe mode", FALSE);
                tv.DlgButton("OK", tv.cmOK);
                tv.DlgButton("Cancel", tv.cmCancel);
                cmd := tv.DlgRun();
                IF cmd = tv.cmOK THEN
                    tv.DlgTextAt(iName, s);
                    tv.CopyText(msg, "Name=");
                    tv.AppendText(msg, s);
                    tv.AppendText(msg, "  Enabled=");
                    IF tv.DlgValue(cOn) = 1 THEN tv.AppendText(msg, "yes")
                    ELSE tv.AppendText(msg, "no") END;
                    tv.AppendText(msg, "  Fast=");
                    IF tv.DlgValue(rFast) = 1 THEN tv.AppendText(msg, "yes")
                    ELSE tv.AppendText(msg, "no") END;
                    IF tv.MessageBox("Result", msg, tv.mbOK) = tv.cmOK THEN END
                END
            ELSIF (e.kind = tv.evKey) AND (e.key = tv.kChar) AND
                  ((e.ch = VAL(CARDINAL, ORD('m'))) OR (e.ch = VAL(CARDINAL, ORD('M')))) THEN
                IF tv.MessageBox("Question", "Proceed with the operation?",
                                 tv.mbYesNo) = tv.cmYes THEN
                    tv.Message("Info", "You chose Yes.")
                ELSE
                    tv.Message("Info", "You chose No.")
                END
            END;
            IF NOT quit THEN tv.Finish END
        END
    END;
    tv.Done
END dialog.