(******************************************************************************)
(*                              SAMPLE20.MOD                                  *)
(*                                                                            *)
(*                             PopUps Example                                 *)
(* Taken from SAMPLE20.PAS - Metagraphics Software Corporation (c) 1987-1989  *)
(*                                                                            *)
(* PSW 10/31/90 11:39pm                                                       *)
(******************************************************************************)

MODULE Sample20;
(*
 *  Graphix
 *  Release 3.7
 *  (c) Copyright 1986-1992 PMI
 *  Green Bay, Wisconsin
 *  (414) 468-6040
 *  All rights reserved
 *
 *)

  IMPORT GrQry;
  IMPORT GrConst;
  IMPORT GrPorts;
  IMPORT GrFonts;
  IMPORT Meta;
  IMPORT IO;
  IMPORT Lib;

  FROM GrConst IMPORT rect;
  FROM GrPorts IMPORT adsPort;
  FROM GrFonts IMPORT adsFont;

(* standard memory allocation procedures *)
  FROM Storage IMPORT ALLOCATE, DEALLOCATE, Available;

  VAR
    GrafixCard,
    CommPort:   INTEGER;
    ch:         CHAR;
    scrnR,tR:   GrConst.rect;
    imagePtr:   GrConst.adsImage;
    i,j:        INTEGER;
    imBytes:    CARDINAL;
    memBytes:   WORD;
    menuTitle:  ARRAY [0..128] OF CHAR;


  PROCEDURE OpenWindow(VAR R: rect; TITLE: ARRAY OF CHAR);
    VAR
      tR:rect;
      tsize:    INTEGER;
      tdescent: INTEGER;
      scrnPort: adsPort;
      txftptr: adsFont;
  BEGIN

    imBytes := VAL(CARDINAL, Meta.ImageSize(R));

    IF NOT(Available(imBytes)) THEN
      GrQry.GrQuit('Insufficient memory', 1);
    END;

    ALLOCATE(ADDRESS(imagePtr), imBytes );

    Meta.ReadImage(R,imagePtr);     (* Save the window area *)
    Meta.FillRect(R,1);             (* Clear the window     *)
    Meta.PenMode(GrConst.zXORz);            (* Outline the window   *)
    Meta.FrameRect(R);

    Meta.GetPort( scrnPort );   (* get address of current port *)

    (* assign address of the current port's font record *)
    txftptr := scrnPort^.txFont;

    (* get values of some font fields *)
    tdescent := txftptr^.descent;
    tsize := txftptr^.lnSpacing;

    (* Display title block  *)
    Meta.SetRect(tR, R.Xmin,R.Ymin,R.Xmax,R.Ymin+tsize);
    Meta.FillRect(tR,0);
    Meta.MoveTo (tR.Xmin+5, tR.Ymax - tdescent );
    Meta.DrawString(TITLE)
  END OpenWindow;

  PROCEDURE CloseWindow(VAR R:rect);
  BEGIN
   Meta.RasterOp (GrConst.zREPz);
   Meta.WriteImage (R, imagePtr);   (* Restore the window area *)
   DEALLOCATE(imagePtr, imBytes);
  END CloseWindow;

BEGIN
  (* init the system *)

  GrQry.GrInit(GrafixCard, CommPort);

  i := Meta.InitGrafix(-GrafixCard);
  IF (i # 0) THEN
     GrQry.GrInitErr(GrafixCard, CommPort, i)
  END;

  Meta.SetDisplay(GrConst.GrafPg0);
  Meta.ScreenRect(scrnR);
  Meta.FillRect(scrnR, 3);
  Meta.SetRect(tR, 75, 75, 250, 150);

  FOR j := 1 TO 3 DO
    Meta.MoveTo(10,20);
    Meta.DrawString('Press a key to show menu  ');
    ch := IO.RdKey();            (* Wait for a keypress        *)
    menuTitle := 'Menu Title';
    OpenWindow (tR, menuTitle);

    Meta.MoveTo(10,20);
    Meta.DrawString('Press a key to remove menu');
    ch := IO.RdKey();            (* Wait for a keypress        *)
    CloseWindow(tR);
    Meta.OffsetRect(tR, 150,20)
  END;

  Meta.MoveTo(10,20);
  Meta.DrawString('Press Return to terminate   ');
  ch := IO.RdKey();              (* Wait for a keypress        *)

  GrQry.GrQuit('', 0);
END Sample20.