MODULE demo;

(* Demo of the terminal TVision-style toolkit (view tree, widgets, mouse).

   Build (from this directory):
       gm2 -fiso -I. tv.o demo.mod -o demo
   Run from a normal terminal.  Tab cycles widgets, arrow keys navigate,
   Enter/Space activate, the mouse drags windows and clicks controls,
   Esc exits. *)

FROM InOut IMPORT WriteString, WriteLn;
FROM SYSTEM IMPORT ADR, CAST;
IMPORT tv;

CONST
    mNew   = 100;
    mQuit  = 101;
    mAbout = 102;
    mCut   = 103;
    mCopy  = 104;
    mPaste = 105;

VAR
    desk, w1, w2, status : tv.ViewPtr;
    input, check, r1, r2, listv, okb, closeb : tv.ViewPtr;
    t : tv.ViewPtr;
    listData : tv.ListData;
    e : tv.Event;
    quit : BOOLEAN;
    cmd : INTEGER;
    sender : tv.ViewPtr;
    tmp, msgbuf : ARRAY [0..63] OF CHAR;

BEGIN
    IF NOT tv.Init() THEN
        WriteString("cannot initialise the terminal (not a tty?)"); WriteLn;
        HALT
    END;
    desk := tv.Desk();

    (* menu bar *)
    tv.MenuBarInit;
    tv.MenuAdd("File");
    tv.MenuItemAdd("New", mNew);
    tv.MenuItemAdd("Open...", mNew);
    tv.MenuSep;
    tv.MenuItemAdd("Quit", mQuit);
    tv.MenuAdd("Edit");
    tv.MenuItemAdd("Cut", mCut);
    tv.MenuItemAdd("Copy", mCopy);
    tv.MenuItemAdd("Paste", mPaste);
    tv.MenuAdd("Help");
    tv.MenuItemAdd("About", mAbout);

    (* status bar (bottom line) *)
    status := tv.NewView(tv.VText, 0, tv.Rows() - 1, tv.Cols(), 1);
    tv.SetText(status, " F10/click: menu   Tab: next   Enter: press   mouse: drag titles   Esc: quit");
    tv.AddView(desk, status);

    (* ---- Editor window ---- *)
    w1 := tv.NewView(tv.VWindow, 3, 2, 56, 16);
    tv.SetText(w1, "Editor");

    t := tv.NewView(tv.VText, 5, 4, 24, 1);
    tv.SetText(t, "Name:"); tv.AddView(w1, t);

    input := tv.NewView(tv.VInput, 12, 4, 32, 1);
    tv.SetText(input, "Modula-2"); tv.AddView(w1, input);

    check := tv.NewView(tv.VCheck, 12, 6, 24, 1);
    tv.SetText(check, "Enabled"); check^.flags := tv.vfSelected; tv.AddView(w1, check);

    t := tv.NewView(tv.VText, 5, 8, 6, 1);
    tv.SetText(t, "Mode:"); tv.AddView(w1, t);

    r1 := tv.NewView(tv.VRadio, 12, 8, 12, 1);
    tv.SetText(r1, "Fast"); r1^.flags := tv.vfSelected; tv.AddView(w1, r1);
    r2 := tv.NewView(tv.VRadio, 26, 8, 12, 1);
    tv.SetText(r2, "Safe"); tv.AddView(w1, r2);

    listData.items[0] := "Alpha";   listData.items[1] := "Bravo";
    listData.items[2] := "Charlie"; listData.items[3] := "Delta";
    listData.items[4] := "Echo";    listData.items[5] := "Foxtrot";
    listData.count := 6;
    listv := tv.NewView(tv.VList, 5, 10, 22, 6);
    listv^.list := CAST(tv.ListDataPtr, ADR(listData));
    tv.AddView(w1, listv);

    okb := tv.NewView(tv.VButton, 30, 15, 8, 1);
    tv.SetText(okb, "OK"); tv.SetTag(okb, tv.cmOK); tv.AddView(w1, okb);
    closeb := tv.NewView(tv.VButton, 41, 15, 10, 1);
    tv.SetText(closeb, "Close"); tv.SetTag(closeb, tv.cmCancel); tv.AddView(w1, closeb);

    tv.AddView(desk, w1);

    (* ---- About window ---- *)
    w2 := tv.NewView(tv.VWindow, 38, 7, 38, 8);
    tv.SetText(w2, "About");
    t := tv.NewView(tv.VText, 40, 9, 34, 1);
    tv.SetText(t, "tvision-m2"); tv.AddView(w2, t);
    t := tv.NewView(tv.VText, 40, 10, 34, 1);
    tv.SetText(t, "A TVision-style toolkit in GNU M2."); tv.AddView(w2, t);
    t := tv.NewView(tv.VText, 40, 11, 34, 1);
    tv.SetText(t, "Drag window titles with the mouse."); tv.AddView(w2, t);
    tv.AddView(desk, w2);

    tv.BringToFront(w1);
    tv.FocusView(input);
    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
            ELSE
                cmd := tv.HandleEvent(e);
                sender := tv.Sender();
                IF cmd = mQuit THEN
                    quit := TRUE
                ELSIF cmd = mAbout THEN
                    tv.Message("About", "tvision-m2 menus - GNU Modula-2")
                ELSIF cmd >= 100 THEN
                    tv.CopyText(msgbuf, "Menu command: ");
                    tv.IntToText(tmp, cmd, 0);
                    tv.AppendText(msgbuf, tmp);
                    tv.SetText(status, msgbuf)
                ELSIF cmd = tv.cmClose THEN
                    IF sender # NIL THEN tv.DelView(sender) END
                ELSIF cmd = tv.cmOK THEN
                    tv.Message("Info", "You pressed OK.")
                ELSIF cmd = tv.cmCancel THEN
                    tv.DelView(w1)
                ELSIF (sender = r1) OR (sender = r2) THEN
                    r1^.flags := 0; r2^.flags := 0;
                    IF sender # NIL THEN sender^.flags := tv.vfSelected END
                END
            END;
            IF NOT quit THEN tv.Finish END
        END
    END;

    tv.Done
END demo.