Programmer 7500/MAX_PROGRAMMERS.iso/PASCAL/PAS_ALL.ZIP/TI670.ASC

Text File | 1992-02-28 | 5.4 KB | 265 lines

  PRODUCT  :  Turbo Pascal                           NUMBER  :  670
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  February 28, 1992                        PAGE  :  1/4

    TITLE  :  Messaging Between Two Dialogs and Update Background
              Events




  {
     This program will create two modeless dialog boxes and will
     allow only one dialog to be created at any time.

     Additionally, it demonstrates how to broadcast messages to
     background windows and update information without changing
     the selected dialog.

  }
  {$X+}

  Program DialogCommunication;

  uses Objects, Drivers, Views, Menus, Dialogs, App, Crt;
  const
    cmDialog1 = 100;
    cmDialog2 = 101;
    cmDialog1Button = 200;
    cmDialog2Button = 201;

  type

   PHelloApp = ^THelloApp;
    THelloApp = object(TApplication)
      procedure MakeDialog;
      procedure HandleEvent(var Event: TEvent); virtual;
      procedure InitMenuBar; virtual;
      procedure InitStatusLine; virtual;
    end;

    PMyDialog1 = ^TMyDialog1;
    TMyDialog1 = object(TDialog)
      procedure MakeDialog2;
      procedure HandleEvent(var Event:TEvent); virtual;
    end;

    PMyDialog2 = ^TMyDialog2;
    TMyDialog2 = object(TMyDialog1)
      procedure HandleEvent(var Event:TEvent); virtual;
    end;

  procedure TMyDialog1.HandleEvent(var Event: TEvent);
  var












  PRODUCT  :  Turbo Pascal                           NUMBER  :  670
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  February 28, 1992                        PAGE  :  2/4

    TITLE  :  Messaging Between Two Dialogs and Update Background
              Events




    AreYouThere: PView;
  begin
    TDialog.HandleEvent(Event);
    if Event.What = evCommand then
      begin
        case Event.Command of
           cmDialog1Button:
             begin
               AreYouThere:= Message(DeskTop, evBroadcast,
  cmDialog2, nil);
               if AreYouThere = nil then
                  MakeDialog2
                else
                  ClearEvent(Event);
             end
        else
          Exit;
        end;
          ClearEvent(Event);
      end;
  end;

  procedure TMyDialog1.MakeDialog2;
  var
    Dialog2: PMyDialog2;
    R: TRect;
    Button: PButton;
  begin
    R.Assign(1,1,40,20);
    Dialog2:= New(PMyDialog2, init(R,'Dialog2'));
    R.Assign(10,10,20,12);
    Button:= New(PButton,Init(R,'Beep', cmDialog2Button,
  bfdefault));
    Dialog2^.Insert(Button);
    DeskTop^.Insert(Dialog2);
  end;

  procedure TMyDialog2.HandleEvent(var Event: TEvent);
  begin
    case Event.Command of
      cmDialog2: begin
                   sound(2000); delay(10); nosound;
                   Title:=newstr('Hello world');












  PRODUCT  :  Turbo Pascal                           NUMBER  :  670
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  February 28, 1992                        PAGE  :  3/4

    TITLE  :  Messaging Between Two Dialogs and Update Background
              Events




                   ReDraw;
                   ClearEvent(Event);
                 end;
    end;
    TDialog.HandleEvent(Event);
    if Event.What = evCommand then
      begin
        case Event.Command of
           cmDialog2Button: begin
                              Sound(1000); delay(100); NoSound;
                            end;
        else
          Exit;
        end;
          ClearEvent(Event);
      end;
  end;

  { THelloApp }

  procedure THelloApp.MakeDialog;
  var
    R:TRect;
    Button1: PButton;
    Dialog1: PMyDialog1;
  begin
    R.Assign(25, 5, 65, 16);
    Dialog1:= New(PMyDialog1, init(R,'Dialog1'));
    R.Assign(16, 8, 38, 10);
    Button1:= New(PButton, Init(R,'Call Dialog2', cmDialog1Button,
  bfDefault));
    Dialog1^.Insert(Button1);
    DeskTop^.Insert(Dialog1);
  end;

  procedure THelloApp.HandleEvent(var Event: TEvent);
  begin
    TApplication.HandleEvent(Event);
    if Event.What = evCommand then
      begin
        case Event.Command of
           cmDialog1:begin
                       MakeDialog;












  PRODUCT  :  Turbo Pascal                           NUMBER  :  670
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  February 28, 1992                        PAGE  :  4/4

    TITLE  :  Messaging Between Two Dialogs and Update Background
              Events




                     end;
        else
          Exit;
        end;
          ClearEvent(Event);
       end;
  end;

  procedure THelloApp.InitMenuBar;
  var
    R: TRect;
  begin
    GetExtent(R);
    R.B.Y := R.A.Y + 1;
    MenuBar := New(PMenuBar, Init(R, NewMenu(
      NewSubMenu('~O~pen Dialogs', hcNoContext, NewMenu(
        NewItem('~D~ialog1','', 0, cmDialog1, hcNoContext,
        NewLine(
        NewItem('E~x~it', 'Alt-X', kbAltX, cmQuit,
          hcNoContext, nil)))), nil))));
  end;

  procedure THelloApp.InitStatusLine;
  var
    R: TRect;
  begin
    GetExtent(R);
    R.A.Y := R.B.Y-1;
    StatusLine := New(PStatusLine, Init(R,
      NewStatusDef(0, $FFFF,
        NewStatusKey('', kbF10, cmMenu,
        NewStatusKey('~Alt-X~ Exit', kbAltX, cmQuit, nil)), nil)));
  end;

  var
    HelloWorld: THelloApp;

  begin
    HelloWorld.Init;
    HelloWorld.Run;
    HelloWorld.Done;
  end.