freepascal.compiler/packages/ncurses/src/ocrt.pp

{$IFNDEF FPC_DOTTEDUNITS}
Unit oCrt;
{$ENDIF FPC_DOTTEDUNITS}
{---------------------------------------------------------------------------
                                 CncWare
                         (c) Copyright 1999-2000
 ---------------------------------------------------------------------------
  Filename..: ocrt.pp
  Programmer: Ken J. Wright, [email protected]
  Date......: 03/01/99

  Purpose - crt unit replacement plus OOP windows using ncurses.

  NOTE: All of the crt procedures & functions have been replaced with ncurses
  driven versions. This makes the ncurses library a little easier to use in a
  Pascal program and benefits from terminal independence.

-------------------------------<< REVISIONS >>--------------------------------
  Ver  |   Date   | Prog| Description
-------+----------+-----+-----------------------------------------------------
  1.00 | 03/01/99 | kjw | Initial Release.
       | 03/22/99 | kjw | Added nDelWindow(), delwin() does not nil pointer.
  1.01 | 11/22/99 | kjw | Added the following: nEcho, ClrEol, ClrBot, InsLine,
                        | DelLine, Delay, nClrEol, nClrBot, nInsLine, nDelLine,
                        | nRefresh, nScroll, nDrawBox, nNewWindow, nWinColor,
                        | nWriteScr, nFrame & some functions for returning
                        | line drawing character values.
  1.02 | 11/26/99 | kjw | Added nKeypressed().
  1.03 | 12/01/99 | kjw | Added global boolean nIsActive.
  1.04 | 12/03/99 | kjw | 1) Added procedures nHline, nVLine, & nWriteAC.
                        | 2) Changed all the line draw character functions
                        | (i.e., nHL, nVL) to return the longint value from
                        | ncurses rather than the character value (which was
                        | not very useful!). Now these can be passed to
                        | nWriteAC() to correctly write the line drawing
                        | characters.
                        | 3) Added more of the ACS characters.
  1.05 | 12/08/99 | kjw | 1) StartCurses() is now done as part of the unit
                        | initialization block. EndCurses() is done via an
                        | exit procedure.
                        | 2) nIsActive is now a function (safer!).
                        | 3) Added panel unit for windowing.
                        | 4) Added tnWindow object.
  1.10 | 12/12/99 | kjw | Added nSEdit().
  1.11 | 12/12/99 | kjw | Added Special property to tEC object. Now any normal
                        | character can trigger sedit to exit.
------------------------------------------------------------------------------
  2.00 | 12/13/99 | kjw | nCrt renamed to oCrt. A new nCrt has been created
                        | which is a drop-in replacement for the FPC crt unit.
                        | oCrt contains all of nCrt plus the OOP extensions.
                        | All of the common code is in ncrt.inc.
  2.01 | 12/15/99 | kjw | 1) A tnWindow object now becomes the target for
                        | stdout following Init & Show. A Hide will put the
                        | target back to stdscr.
                        | 2) Added nSetActiveWin() to manually pick a target
                        | window for stdout.
  2.02 | 12/15/99 | kjw | 1) PutFrame applied keypad to stdscr instead of sub.
                        | 2) See ncrt.inc
  2.03 | 12/16/99 | kjw | 1) See ncrt.inc
                        | 2) Added shift/f-key constants.
  2.04 | 01/04/00 | kjw | See ncrt.inc
  2.05 | 01/06/00 | kjw | 1) See ncrt.inc.
                        | 2) Added boolean internal_fwrite. FWrite was failing
                        | when trying to write outside of the active window.
                        | 3) nSEdit was not handling tec.firsttime correctly
                        | when a tec.special was processed.
  2.06 | 01/11/00 | kjw | See ncrt.inc.
  2.07 | 01/31/00 | kjw | 1) See ncrt.inc.
                        | 2) Added getcolor, getframecolor, getheadercolor
                        | methods to tnWindow.
  2.08 | 06/09/00 | kjw | 1) Added Picture property to tEC object. This is
                        | used for picture input masking in nSEdit.
                        | 2) Added nCheckPxPicture() function.
                        | 3) nSEdit() changed to use picture input masking.
                        | See pxpic.txt for a description of the picture
                        | string format.

  2.08.01 | 06/11/2000 | kjw
          | Fixed the spin cycle problem in nCheckPXPicture.
  2.09.00 | 06/16/2000 | kjw
          | 1) nSEdit renamed to nEdit. Now nSEdit just calls nEdit() for
          | compatibility.
          | 2) Added overloaded nEdit functions for Integer, LongInt, and
          | Real types.
          | 3) Changed nEdit() embedding of control characters to preface
          | with a ^P. Also now uses a highlight attribute for the control
          | characters.
          | 4) Added control character cursor control to nEdit().
          | 5) Added Esc/1..0 = F1..F10 to nEdit().
          | 6) Added '@' to match set in pxpic.inc.
          | 7) tnWindow.Align was not positioning properly. Off by one.
          | 8) tnWindow.Init used wrong pointer for keypad and intrflush.
          | 9) tnWindow.Edit was messing up ec.Special.
  2.09.01 | 06/16/2000 | kjw
          | 1) nStdScr (tnWindow) added and initialized at unit startup.
          | nStdScr can be used for a default full screen window.
          | 2) nEdit overloaded to work without a window pointer. It works
          | with the currently active window.
  2.10.00 | 06/23/2000 | kjw
          | 1) Added character mapping to the tEC object. This includes the
          | ChMap property and the AddChMap() and ClrChMap() methods.
          | 2) Added AppendMode property to the tEC object. The character
          | typed in nEdit() is always appended to the current string
          | regardless of cursor position. Useful when ExitMode is true.
          | 3) tnWindow.Done was not re-assigning an ActiveWn.
          | 4) nEdit LeftArrow was allowing < x.
          | 5) Added nEditNumber() function.
          | 6) Added nEditDate() function.
          | 7) I made a command decision and renamed the tEC.FirstTime
          | property to tEC.ClearMode as it is more descriptive.
  2.11.00 | 1) Cleaned up some loose ends with 2.10.
          | 2) Some more overloading
          | 3) Removed tnWindow.readln, write, and writeln methods.
          | 4) See ncrt.inc.
  2.12.00 | 1) Remove the "n" from the tnWindow.editxxx functions for
          | consistancy. Procedurals are prefaced with an "n". Object methods
          | are not.
          | 2) Procedural FWrite renamed to nFWrite.
          | 3) tEC object type renamed to tnEC.
          | 4) Added nMakeWindow(), a one line procedural wrapper for
          | tnWindow.Init and tnWindow.PutHeader.
          | 5) Added GetX, GetY, IsFramed methods to tnWindow;
          | 6) Fixed nFWrite for too long strings;
          | 7) tnWindow.Align was wrong when justify was none.
  2.13.00 | 06/30/00 | kjw | See ncrt.inc
  2.14.00 | 07/05/00 | kjw | See ncrt.inc
  2.15.00 | 07/12/00 | kjw |
          | 1) Renamed IsBold to nIsBold. Renamed SetColorPair to nSetColorPair.
          | 2) Added tnMenu object (not functional);
          | 07/17/00 | kjw |
          | 2) Argh!! Align method had another mistake. Changed x/y=1 to =0.
          | 3) Added nShowMessage() function.
          | 4) tnMenu is now minimally functional.
          | 07/25/00 | kjw |
          | 1) tnMenu fully functional for current level.
  2.16.00 | 08/14/2000 | kjw |
          | 1) Added Get/SetMark(), IsActive(), IsValid(), IsAssigned(),
          | SetIndex() to tnMenu.
          | 08/18/2000 | kjw |
          | 1) Added nkXXX constants for all(?) extended keys.
          | 2) Changed all uses of extended keys to use new nkXXX's.
          | 3) Edit overloaded to return a nkXXX in ch rather that a AnsiChar.
          | 4) Resize method added to tnWindow.
          | 5) AddChMap overloaded for preferred (easier) use with nkXXX's.
          | 08/24/2000 | kjw |
          | 1) Added nReadScr, nReadScrStr, nReadScrColor, nWriteScrStr,
          | nGrabScreen, nPopScreen, nReleaseScreen.
          | 2) Fixed some trouble with PrevWn accuracy.
  2.16.01 | 05/26/2009 | kjw |
          | 1) Corrected error with tnWindow.PutFrame and wattr_get. Recent
          | updates to ncurses and ocrt by the FreePascal team introduced an
          | error with tnWindow.PutFrame's use of wattr_get.
------------------------------------------------------------------------------
}
Interface

{$IFDEF FPC_DOTTEDUNITS}
Uses
{$ifdef Unix}
    UnixApi.Base,
    UnixApi.TermIO,
{$endif}
  Api.Ncurses,Api.NCurses.Panel,Api.NCurses.Menu,
  TP.DOS;  {TP.DOS needed for TextRec}
{$ELSE FPC_DOTTEDUNITS}
Uses
{$ifdef unix}
    baseunix,
    termio,
{$endif}
  ncurses,panel,menu,
  dos;  {dos needed for TextRec}
{$ENDIF FPC_DOTTEDUNITS}

Const

   { decimal number format, us or european }
   nUS = 0;
   nEURO = 1;
   nDecFmt : byte = nUS;

   { border styles for text boxes }
   btNone : integer = 0;
   btSingle : integer = 1;
   btDouble : integer = 2;

   { ordinal keycodes, new style, preferred }
   nkEnter     = 13;       { Enter key }
   nkEsc       = 27;       { Home key }
   nkHome      = -71;      { Home key }
   nkUp        = -72;      { Up arrow }
   nkPgUp      = -73;      { PgUp key }
   nkLeft      = -75;      { Left arrow }
   nkRight     = -77;      { Right arrow }
   nkEnd       = -79;      { End key }
   nkDown      = -80;      { Down arrow }
   nkPgDn      = -81;      { PgDn key }
   nkIns       = -82;      { Insert key }
   nkDel       = -83;      { Delete key }
   nkCtrlLeft  = -115;     { Ctrl/left arrow }
   nkCtrlRight = -116;     { Ctrl/right arrow }
   nkF1        = -59;      { f1 key }
   nkF2        = -60;      { f2 key }
   nkF3        = -61;      { f3 key }
   nkF4        = -62;      { f4 key }
   nkF5        = -63;      { f5 key }
   nkF6        = -64;      { f6 key }
   nkF7        = -65;      { f7 key }
   nkF8        = -66;      { f8 key }
   nkF9        = -67;      { f9 key }
   nkF10       = -68;      { f10 key }
   nkF11       = -84;      { shift/f1 key }
   nkF12       = -85;      { shift/f2 key }
   nkF13       = -86;      { shift/f3 key }
   nkF14       = -87;      { shift/f4 key }
   nkF15       = -88;      { shift/f5 key }
   nkF16       = -89;      { shift/f6 key }
   nkF17       = -90;      { shift/f7 key }
   nkF18       = -91;      { shift/f8 key }
   nkF19       = -92;      { shift/f9 key }
   nkF20       = -93;      { shift/f10 key }
   nkAltA      = -30;      { alt/a }
   nkAltB      = -48;      { alt/b }
   nkAltC      = -46;      { alt/c }
   nkAltD      = -32;      { alt/d }
   nkAltE      = -18;      { alt/e }
   nkAltF      = -33;      { alt/f }
   nkAltG      = -34;      { alt/g }
   nkAltH      = -35;      { alt/h }
   nkAltI      = -23;      { alt/i }
   nkAltJ      = -36;      { alt/j }
   nkAltK      = -37;      { alt/k }
   nkAltL      = -38;      { alt/l }
   nkAltM      = -50;      { alt/m }
   nkAltN      = -49;      { alt/n }
   nkAltO      = -24;      { alt/o }
   nkAltP      = -25;      { alt/p }
   nkAltQ      = -16;      { alt/q }
   nkAltR      = -19;      { alt/r }
   nkAltS      = -31;      { alt/s }
   nkAltT      = -20;      { alt/t }
   nkAltU      = -22;      { alt/u }
   nkAltV      = -47;      { alt/v }
   nkAltW      = -17;      { alt/w }
   nkAltX      = -45;      { alt/x }
   nkAltY      = -21;      { alt/y }
   nkAltZ      = -44;      { alt/z }
   nkAlt1      = -120;     { alt/1 }
   nkAlt2      = -121;     { alt/2 }
   nkAlt3      = -122;     { alt/3 }
   nkAlt4      = -123;     { alt/4 }
   nkAlt5      = -124;     { alt/5 }
   nkAlt6      = -125;     { alt/6 }
   nkAlt7      = -126;     { alt/7 }
   nkAlt8      = -127;     { alt/8 }
   nkAlt9      = -128;     { alt/9 }
   nkAlt0      = -129;     { alt/0 }
   nkAltMinus  = -130;     { alt/- }
   nkAltEqual  = -131;     { alt/= }
   nkAltTab    = -15;      { alt/tab }

   { ordinal key codes (old style, don't break any apps!) }
   nKeyEnter     = nkEnter;
   nKeyEsc       = nkEsc;
   nKeyHome      = abs(nkHome);
   nKeyUp        = abs(nkUp);
   nKeyPgUp      = abs(nkPgUp);
   nKeyLeft      = abs(nkLeft);
   nKeyRight     = abs(nkRight);
   nKeyEnd       = abs(nkEnd);
   nKeyDown      = abs(nkDown);
   nKeyPgDn      = abs(nkPgDn);
   nKeyIns       = abs(nkIns);
   nKeyDel       = abs(nkDel);
   nKeyCtrlLeft  = abs(nkCtrlLeft);
   nKeyCtrlRight = abs(nkCtrlRight);
   nKeyF1        = abs(nkF1);
   nKeyF2        = abs(nkF2);
   nKeyF3        = abs(nkF3);
   nKeyF4        = abs(nkF4);
   nKeyF5        = abs(nkF5);
   nKeyF6        = abs(nkF6);
   nKeyF7        = abs(nkF7);
   nKeyF8        = abs(nkF8);
   nKeyF9        = abs(nkF9);
   nKeyF10       = abs(nkF10);
   nKeyF11       = abs(nkF11);
   nKeyF12       = abs(nkF12);
   nKeyF13       = abs(nkF13);
   nKeyF14       = abs(nkF14);
   nKeyF15       = abs(nkF15);
   nKeyF16       = abs(nkF16);
   nKeyF17       = abs(nkF17);
   nKeyF18       = abs(nkF18);
   nKeyF19       = abs(nkF19);
   nKeyF20       = abs(nkF20);

   { character mapping }
   nMaxChMaps    = 255;     { maximun index for character mapping }

   { menus }
   nMAXMENUITEMS = 100;

Type
   {*** structures to save a screen via nGrabScreen ***}
   pnOneRow = pchtype;
   { a buffer for a max of 256 chtype items accessed via PAnsiChar }
   tnOneRow = array [0..1023] of AnsiChar;
   { a one way linked list of screen rows }
   pnRowBuf = ^tnRowBuf;
   tnRowBuf = Record
      row : pnOneRow;    { one row of a screen }
      next : pnRowBuf;   { next row in the list }
   End;
   { the header record of a saved screen }
   pnScreenBuf = ^tnScreenBuf;
   tnScreenBuf = Record
      x,                 { column origin }
      y,                 { row origin }
      n : integer;       { number of columns }
      first : pnRowBuf;  { pointer to first row in list }
   End;

   tnS10 = string[10];

   { for scrolling a window }
   tnUpDown = (up,down);
   { for window & header positioning }
   tnJustify = (none,left,center,right,top,bottom);
   { used for nEC character mapping }
   (********* Note : these are obsolete *******)
   nChMapStr = string[4];
   {nChMap = array [1..nMaxChMaps] of nChMapStr;}
   (*******************************************)
   nChMap = array [1..nMaxChMaps,1..2] of integer;

   { used for nSEdit }
   {------------------------------------------------------------------------
     ClearMode = true : passed string is initialized to ''.
      IsHidden = true : causes a string of '*' to display in place of
                        the actual characters typed.
       InsMode        : toggle for insert/overwrite mode.
      ExitMode = true : sedit exits after every keystroke.
               = false: sedit only exits when #27,#13, or any extended
                        key *except* for Home,End,RArrow,LArrow.
       Special        : If a pressed key is found in this string, then
                        sedit exits without processing.
       Picture        : An input mask string. See pxpic.txt for an
                        explanation of picture strings.
     CtrlColor        : The highlight color for embedded control characters.
         ChMap        : An array of character triplets describing a character
                        that is typed and what it should map to.
    ------------------------------------------------------------------------}
   tnEC = Object
      ClearMode,
      IsHidden,
      InsMode,
      ExitMode,
      AppendMode : boolean;
      Special : shortstring;
      Picture : shortstring;
      CtrlColor : integer;
      ChMap : nChMap;
      Constructor Init(ft,ih,im,em,ap : boolean;
                                  s,p : shortstring;
                                   cc : integer;
                                   mp : nChMap);
      Destructor Done;
      Function AddChMap(_in,_out : integer) : integer;
      Function AddChMap(mp : nChMapStr) : integer;
      Procedure ClrChMap(idx : integer);
   End;

   pwin = PWindow;

   pnWindow = ^tnWindow;
   tnWindow = Object
      Private
          wn : pwindow;       { pointer to win or sub to read/write to }
         win : pwindow;       { pointer to main window record }
         sub : pwindow;       { sub window if a bordered window }
         pan : ppanel;        { pointer to panel record }
         subp : ppanel;       { sub panel if a bordered window }
         visible : boolean;   { is the window visible? }
         hasframe : boolean;
         wincolor,            { window color }
         framecolor,          { frame color }
         hdrcolor : integer;  { header color }
         hdrpos : tnJustify;  { header alignment }
         header : string[80]; { header string }
         Procedure init_wins(x,y,x1,y1 : integer);
         Procedure done_wins;
      Public
         data : pointer;      { a pointer to user defined data }
         ec : tnEC;           { edit control settings }
         Constructor Init(x,y,x1,y1,wcolor : integer;
                                    border : boolean;
                                    fcolor : integer);
         Destructor Done;
         Procedure Resize(cols_,rows_ : integer);
         Procedure Active;  { make this the current window }
         Procedure Show;    { display the window }
         Procedure Hide;    { hide the window }
         Procedure ClrScr;
         Procedure ClrEol;
         Procedure ClrBot;
         Procedure InsLine;
         Procedure DelLine;
         Procedure GotoXY(x,y : integer);
          Function WhereX : integer;
          Function WhereY : integer;
          Function ReadKey : AnsiChar;
         Procedure WriteAC(x,y,att,c : longint);
         Procedure FWrite(x,y,att,z : integer; s : shortstring);
         Procedure DrawBox(LineStyle,x1,y1,x2,y2,att : Integer);
          Function GetHeader : shortstring;
         Procedure PutHeader(hdr : shortstring; hcolor : integer; hpos : tnJustify);
         Procedure SetColor(att : integer);
          Function GetColor : integer;
          Function GetFrameColor : integer;
          Function GetHeaderColor : integer;
         Procedure PutFrame(att : integer);
         Procedure Move(x,y : integer);
         Procedure Scroll(ln : integer; dir : tnUpDown);
         Procedure Align(hpos,vpos : tnJustify);
          Function Rows : integer;
          Function Cols : integer;
          Function GetX : integer;
          Function GetY : integer;
          Function IsFramed : boolean;
          Function IsVisible : Boolean;
          Function Edit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : integer) : shortstring;
          Function Edit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : integer) : LongInt;
          Function Edit(x,y,att,z,CursPos:Integer;es:Real;Var ch : integer) : Real;
          Function Edit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : AnsiChar) : shortstring;
          Function Edit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : AnsiChar) : LongInt;
          Function Edit(x,y,att,z,CursPos:Integer;es:Real;Var ch : AnsiChar) : Real;
          Function EditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : real;var esc : boolean) : real;
          Function EditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : longint;var esc : boolean) : longint;
          Function EditDate(x,y,att : integer;initv : shortstring;var esc : boolean) : shortstring;
   End;

   pnMenuStr = ^tnMenuStr;
   tnMenuStr = array [0..79] of AnsiChar; { storage for menu item text }
   pnMenu = ^tnMenu;
   tnMenu = Object
      Private
         tc,   { text (item) color }
         cc,   { cursor (current item) color }
         fc,   { frame color }
         hc,   { header Color }
         gc,   { non-selectable color }
         x,y,  { top,left corner of window }
         r,c,  { how many rows & columns of items to display }
         wid,  { minimum window width }
         iidx, { item index }
         merr  { menu error code }
               : integer;
         loopon,
         framed,
         posted : boolean; { is the menu posted? }
         mark : tnS10;
         items : array[1..nMAXMENUITEMS] of pnMenuStr;
         pi : array[1..nMAXMENUITEMS] of pItem;
         pm : pMenu;
         win : pnWindow;
         Procedure InitWin;
         Procedure ClearItem(idx : integer);
         Procedure AddItem(i : integer; s : shortstring);
         Function Selectable(idx : integer) : boolean;
         Function IsValid(idx : integer) : boolean;
      Public
         Constructor Init(_x,_y,_w,_r,_c,_tc,_cc,_gc : integer;
                          _fr : boolean; _fc : integer);
         Destructor Done;
         Procedure Post;            { create the menu of current items }
         Procedure UnPost;          { unbind the items and free the menu }
         Procedure Start;           { start user input, includes show }
         Procedure Stop;            { a shortcut for hide,unpost }
         Procedure Show;            { display the menu, includes post }
         Procedure Hide;            { remove the menu from the display }
          Function Wind : pnWindow; { pointer to the window object }
         Procedure Move(_x,_y : integer);       { shortcut window move }
         Procedure Align(hpos,vpos : tnJustify);{ shortcut window align }
         Procedure PutHeader(hdr : shortstring; hcolor : integer; hpos : tnJustify);
         Procedure Clear;           { unpost and clear the menu item list }
          Function Add(s : shortstring) : integer; { append a menu item }
         Procedure Insert(idx : integer; s : shortstring); { insert a menu item }
         Procedure Remove(idx : integer);     { delete a menu item }
         Procedure Change(idx : integer; s : shortstring); { change an item }
         Procedure Active(idx : integer; b : boolean); { toggle gray }
          Function IsActive(idx : integer) : boolean; { item active ? }
         Procedure Spin(b : boolean);{ toggle item looping }
          Function Status : integer;{ return the current error/status code }
          Function Index : integer; { return the current item index }
         Procedure SetIndex(idx : integer); { set the item index }
          Function Count : integer; { number of items in the menu }
          Function Rows(_r : integer) : integer; {get/set menu rows }
          Function Cols(_c : integer) : integer; {get/set menu columns }
          Function IsAssigned(idx : integer) : boolean; { valid & assigned }
          Function GetMark : shortstring; { return the item mark shortstring }
         Procedure SetMark(ms : shortstring); { set the mark string }
         Procedure Refresh;
         Procedure SetColor(att : byte);       { change text color }
         Procedure SetCursorColor(att : byte); { change cursor color }
         Procedure SetFrameColor(att : byte);  { change frame color }
         Procedure SetGrayColor(att : byte);   { change inactive color }
   End;

Var
   nStdScr : tnWindow; { default window created at unit initialization }
   nscreen : pwin;     { pointer to ncurses stdscr }
   nEC : tnEC;         { global edit control object }

Procedure nSetActiveWin(win : pwindow);
Procedure nDoNow(donow : boolean);
 Function nKeypressed(timeout : word) : boolean;
Procedure nEcho(b : boolean);
Procedure nWindow(var win : pWindow; x,y,x1,y1 : integer);
Procedure nNewWindow(var win : pWindow; x,y,x1,y1 : integer);
Procedure nDelWindow(var win : pWindow);
Procedure nWinColor(win : pWindow; att : integer);
Procedure nClrScr(win : pWindow; att : integer);
Procedure nClrEol(win : pWindow);
Procedure nClrBot(win : pWindow);
Procedure nInsLine(win : pWindow);
Procedure nDelLine(win : pWindow);
Procedure nGotoXY(win : pWindow; x,y : integer);
 Function nWhereX(win : pWindow) : integer;
 Function nWhereY(win :  pWindow) : integer;
 Function nReadkey(win : pWindow) : AnsiChar;
 Function nReadln(win : pWindow) : shortstring;
Procedure nWrite(win : pWindow; s : shortstring);
Procedure nWriteln(win : pWindow; s : shortstring);
Procedure nWriteScr(win : pWindow; x,y,att : integer; s : shortstring);
Procedure nRefresh(win : pWindow);
Procedure nScroll(win : pWindow; lines : integer; dir : tnUpDown);
Procedure nDrawBox(win : pWindow; LineStyle,x1,y1,x2,y2,att : Integer);
Procedure nFrame(win : pWindow);
 Function nRows(win : pWindow) : integer;
 Function nCols(win : pWindow) : integer;
 Function nHL : longint; { horizontal line }
 Function nVL : longint; { vertical line }
 Function nUL : longint; { upper left corner }
 Function nLL : longint; { lower loft corner }
 Function nUR : longint; { upper right corner }
 Function nLR : longint; { lower right corner }
 Function nLT : longint; { left tee }
 Function nRT : longint; { right tee }
 Function nTT : longint; { top tee }
 Function nBT : longint; { bottom tee }
 Function nPL : longint; { plus, + }
 Function nLA : longint; { left arrow }
 Function nRA : longint; { right arrow }
 Function nUA : longint; { up arror }
 Function nDA : longint; { down arrow }
 Function nDI : longint; { diamond }
 Function nCB : longint; { checkerboard }
 Function nDG : longint; { degree }
 Function nPM : longint; { plus/minus }
 Function nBL : longint; { bullet }
Procedure nHLine(win : pwindow; col,row,attr,x : integer);
Procedure nVLine(win : pwindow; col,row,attr,y : integer);
Procedure nWriteAC(win : pwindow; x,y : integer; att,acs_char : longint);
 Function nIsBold(att : integer) : boolean;
 Function nSetColorPair(att : integer) : integer;
Procedure nFWrite(win : pwindow; col,row,attrib : integer; clear : integer; s : shortstring);
Procedure nFWrite(col,row,attrib : integer; clear : integer; s : shortstring);
 Function nSEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:shortstring;Var ch : AnsiChar) : shortstring;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:shortstring;Var ch : AnsiChar) : shortstring;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:LongInt;Var ch : AnsiChar) : LongInt;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:Real;Var ch : AnsiChar) : Real;
 Function nEdit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : AnsiChar) : shortstring;
 Function nEdit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : AnsiChar) : LongInt;
 Function nEdit(x,y,att,z,CursPos:Integer;es:Real;Var ch : AnsiChar) : Real;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:shortstring;Var chv : integer) : shortstring;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:LongInt;Var ch : integer) : LongInt;
 Function nEdit(win : pwindow; x,y,att,z,CursPos:Integer;es:Real;Var ch : integer) : Real;
 Function nEdit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : integer) : shortstring;
 Function nEdit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : integer) : LongInt;
 Function nEdit(x,y,att,z,CursPos:Integer;es:Real;Var ch : integer) : Real;
 Function nEditNumber(win : pwindow; x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : real;var esc : boolean) : real;
 Function nEditNumber(win : pwindow; x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : longint;var esc : boolean) : longint;
 Function nEditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : real;var esc : boolean) : real;
 Function nEditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : longint;var esc : boolean) : longint;
 Function nEditDate(win : pwindow; x,y,att : integer;initv : shortstring;var esc : boolean) : shortstring;
 Function nEditDate(x,y,att : integer;initv : shortstring;var esc : boolean) : shortstring;
Procedure nMakeWindow(var win : tnWindow;x1,y1,x2,y2,ta,ba,ha : integer;hasframe : boolean;hdrpos : tnJustify;hdrtxt : shortstring);
Procedure nMakeWindow(var win : pnWindow;x1,y1,x2,y2,ta,ba,ha : integer;hasframe : boolean;hdrpos : tnJustify;hdrtxt : shortstring);
Procedure nMakeMenu(var mnu : tnMenu;x,y,_w,_r,_c,ta,ca,ga,ba,ha : integer;hasframe : boolean;hdrpos : tnJustify;hdrtxt : shortstring);
Procedure nMakeMenu(var mnu : pnMenu;x,y,_w,_r,_c,ta,ca,ga,ba,ha : integer;hasframe : boolean;hdrpos : tnJustify;hdrtxt : shortstring);
 Function nShowMessage(msg : shortstring;matt : byte;hdr : shortstring;hatt : byte;ack : boolean) : pnWindow;
 Function nReadScr(win : pWindow; x,y,n : integer) : shortstring;
 Function nReadScr(x,y,n : integer) : shortstring;
 Function nReadScrStr(win : pWindow; x,y,n : integer; buf : pchtype) : pchtype;
 Function nReadScrStr(x,y,n : integer; buf : pchtype) : pchtype;
 Function nReadScrColor(win : pWindow; x,y : integer) : integer;
 Function nReadScrColor(x,y : integer) : integer;
Procedure nWriteScrStr(win : pWindow; x,y : integer; s : pchtype);
Procedure nWriteScrStr(x,y : integer; s : pchtype);
Procedure nGrabScreen(var p : pnScreenBuf; x,y,c,r : integer; win : pWindow);
Procedure nGrabScreen(var p : pnScreenBuf; x,y,c,r : integer);
Procedure nGrabScreen(var p : pnScreenBuf);
Procedure nPopScreen(p : pnScreenBuf; x,y : integer; win : pWindow);
Procedure nPopScreen(p : pnScreenBuf; x,y : integer);
Procedure nPopScreen(p : pnScreenBuf);
Procedure nReleaseScreen(p : pnScreenBuf);
 Function nCheckPxPicture(var s, Pic : shortstring; var CPos : integer) : word;

{$i ncrt.inc}
{$i pxpic.inc}

Var
   _chmap : nChMap;

{---------------------------------------------------------------------
  tnWindow.Init

  Create a new window.
       x = upper left corner x, screen relative
       y = upper left corner y, screen relative
      x1 = lower right corner x, screen relative
      y1 = lower right corner y, screen relative
  wcolor = window/text color
  border = include a frame?
  fcolor = frame color
 ---------------------------------------------------------------------}
Constructor tnWindow.Init(x,y,x1,y1,wcolor : integer;
                           border : boolean;
                           fcolor : integer);
Var
   mp : nChMap;
Begin
   hasframe := border;
   wincolor := wcolor;
   framecolor := fcolor;
   hdrcolor := wcolor;
   header := '';
   data := nil;
   visible := false;
   init_wins(x,y,x1,y1);
   FillChar(mp,SizeOf(mp),#0);
   ec.Init(false,false,false,false,false,'','',15,mp);
   ec.ClrChMap(0);
   SetActiveWn(wn);
End;

{ deallocate the window }
Destructor tnWindow.Done;
Begin
   done_wins;
   ec.Done;
   SetActiveWn(nscreen);
End;

Procedure tnWindow.init_wins(x,y,x1,y1 : integer);
Begin
   win := nil;
   sub := nil;
   pan := nil;
   subp := nil;
   win := newwin(y1-y+1,x1-x+1,y-1,x-1);
   pan := new_panel(win);
   hide_panel(pan);
   If hasframe Then
      PutFrame(framecolor)
   Else Begin
      wn := win;
      wbkgd(win,COLOR_PAIR(nSetColorPair(wincolor)));
      If nisbold(wincolor) then wattr_on(win,A_BOLD,nil);
      scrollok(win,bool(true));
      intrflush(win,bool(false));
      keypad(win,bool(true));
   End;
End;

Procedure tnWindow.done_wins;
Begin
   If subp <> nil Then del_panel(subp);
   If pan <> nil Then del_panel(pan);
   If sub <> nil Then delwin(sub);
   If (win <> nil) and (win <> stdscr) Then delwin(win);
   subp := nil;
   pan := nil;
   sub := nil;
   If win <> stdscr Then win := nil;
End;

Procedure tnWindow.ReSize(cols_,rows_ : integer);
Var
   xx,yy,
   mx,my : integer;
   vis : boolean;
Begin
   xx := GetX;
   yy := GetY;
   { can't be larger than full screen }
   If cols_ > nMaxCols Then cols_ := nMaxCols;
   If rows_ > nMaxRows Then rows_ := nMaxRows;
   { set the bottom, right corner }
   mx := xx+cols_-1;
   my := yy+rows_-1;
   { expand left? }
   If mx > nMaxCols Then xx := nMaxCols-cols_+1;
   { expand up? }
   If my > nMaxRows Then yy := nMaxRows-rows_+1;
   If xx < 1 Then xx := 1;
   If yy < 1 Then yy := 1;
   { reset the bottom, right corner }
   mx := xx+cols_-1;
   my := yy+rows_-1;
   { constrain to full screen }
   If mx > nMaxCols Then mx := nMaxCols;
   If my > nMaxRows Then my := nMaxRows;
   vis := visible;
   Hide;
   visible := vis;
   done_wins;
   init_wins(xx,yy,mx,my);
   If visible Then Show;
End;

{ make the window current for all normal crt requests }
Procedure tnWindow.Active;
Begin
   SetActiveWn(wn);
End;

{ display the window and move to the top }
Procedure tnWindow.Show;
Begin
   SetActiveWn(wn);
   visible := true;
   show_panel(pan);
   If subp <> nil Then show_panel(subp);
   update_panels;
   doupdate;
End;

{ hide the window }
Procedure tnWindow.Hide;
Begin
   { don't go back to yourself }
   If PrevWn <> wn Then
      SetActiveWn(PrevWn)
   Else
      SetActiveWn(stdscr);
   visible := false;
   If subp <> nil Then hide_panel(subp);
   hide_panel(pan);
   update_panels;
   doupdate;
   GotoXY(WhereX,WhereY);
End;

Procedure tnWindow.ClrScr;
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nClrScr(wn,wincolor);
   dorefresh := tmp_b;
End;

Procedure tnWindow.ClrEol;
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nClrEol(wn);
   dorefresh := tmp_b;
End;

Procedure tnWindow.ClrBot;
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nClrBot(wn);
   dorefresh := tmp_b;
End;

Procedure tnWindow.InsLine;
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nInsLine(wn);
   dorefresh := tmp_b;
End;

Procedure tnWindow.DelLine;
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nDelLine(wn);
   dorefresh := tmp_b;
End;

{ return the window border header shortstring }
Function tnWindow.GetHeader : shortstring;
Begin
   GetHeader := header;
End;

{----------------------------------------------------------------------
  put/replace a header shortstring at the top of a bordered window

     hdr = header shortstring (top line of window, only if hasframe = true)
  hcolor = header line color
    hpos = justfication of header shortstring, left, center, or right
 ----------------------------------------------------------------------}
Procedure tnWindow.PutHeader(hdr : shortstring; hcolor : integer; hpos : tnJustify);
Var
   cp,
   hx,
   len : integer;
   att,
   mx,my : longint;
Begin
   If Hasframe Then Begin
      If hdr <> '' Then Begin
         header := hdr;
         hdrcolor := hcolor;
         hdrpos := hpos;
         getmaxyx(win,my,mx);
         nHline(win,2,1,framecolor,mx-1);
         len := mx-2;
         hdr := Copy(hdr,1,len);
         len := Length(hdr);
         Case hpos of
           left   : hx := 1;
           center : hx := (mx - len) div 2;
           right  : hx := (mx - len) - 1;
         End;
         mvwaddstr(win,0,hx,StrPCopy(ps,hdr));
         cp := nSetColorPair(hcolor);
         If nIsBold(hcolor) Then
            att := A_BOLD
         Else
            att := A_NORMAL;
         mvwchgat(win,0,hx,len,att,cp,Nil);
      End;
   End;
End;

{ set the the color of the writable window }
Procedure tnWindow.SetColor(att : integer);
Begin
   wbkgd(wn,COLOR_PAIR(nSetColorPair(att)));
   If nisbold(att) then 
     wattr_set(wn,A_BOLD,0,Nil);
   wincolor := att;
   If visible Then wrefresh(wn);
End;

{ get the writeable window color }
Function tnWindow.GetColor : integer;
Begin
   GetColor := wincolor;
End;

{ get the frame color }
Function tnWindow.GetFrameColor : integer;
Begin
   GetFrameColor := framecolor;
End;

{ get the header color }
Function tnWindow.GetHeaderColor : integer;
Begin
   GetHeaderColor := hdrcolor;
End;

{ frame an un-framed window, or update the frame color of a framed window }
Procedure tnWindow.PutFrame(att : integer);
Var
   x,y,
   mx,my,
   atts : longint;
   junk : smallint;
   
Begin
   wbkgd(win,COLOR_PAIR(nSetColorPair(att)));
   wattr_get(win,@atts,@junk,nil);
   If nisbold(att) then wattr_on(win,atts or A_BOLD,Nil);
   box(win,ACS_VLINE,ACS_HLINE);
   framecolor := att;
   If framecolor = -1 Then framecolor := wincolor;
   hasframe := true;
   If header <> '' Then PutHeader(header,hdrcolor,hdrpos);
   If sub = nil Then Begin
      getbegyx(win,y,x);
      getmaxyx(win,my,mx);
      sub := newwin(my-2,mx-2,y+1,x+1);
      If sub <> nil Then Begin
         subp := new_panel(sub);
         hide_panel(subp);
         wbkgd(sub,COLOR_PAIR(nSetColorPair(wincolor)));
         If nisbold(wincolor) then wattr_on(sub,A_BOLD,Nil);
         scrollok(sub,bool(true));
         intrflush(sub,bool(false));
         keypad(sub,bool(true));
         wn := sub;
      End;
   End;
   touchwin(sub);
   If visible Then Begin
      wrefresh(win);
      wrefresh(sub);
   End;
End;

{ move the window }
Procedure tnWindow.Move(x,y : integer);
Begin
   move_panel(pan,y-1,x-1);
   If subp <> nil Then move_panel(subp,y,x);
   If visible Then Begin
      update_panels;
      doupdate;
   End;
End;

Procedure tnWindow.Align(hpos,vpos : tnJustify);
Var
   x,y,
   bx,by : longint;
Begin
   getmaxyx(win,y,x);
   getbegyx(win,by,bx);
   Case hpos of
      none   : x := bx;
      left   : x := 0;
      right  : x := MaxCols - x;
      center : x := (MaxCols - x) div 2;
   End;
   Case vpos of
      none   : y := by;
      top    : y := 0;
      bottom : y := MaxRows - y;
      center : y := (MaxRows - y) div 2;
   End;
   move(x+1,y+1);
End;

Procedure tnWindow.Scroll(ln : integer; dir : tnUpDown);
Begin
   nScroll(wn,ln,dir);
End;

Procedure tnWindow.GotoXY(x,y : integer);
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nGotoXY(wn,x,y);
   dorefresh := tmp_b;
End;

Function tnWindow.WhereX : integer;
Begin
   WhereX := nWhereX(wn);
End;

Function tnWindow.WhereY : integer;
Begin
   WhereY := nWhereY(wn);
End;

Function tnWindow.ReadKey : AnsiChar;
Begin
   ReadKey := nReadKey(wn);
End;

Procedure tnWindow.WriteAC(x,y,att,c : longint);
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nWriteAC(wn,x,y,att,c);
   dorefresh := tmp_b;
End;

Procedure tnWindow.FWrite(x,y,att,z : integer; s : shortstring);
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nFWrite(wn,x,y,att,z,s);
   dorefresh := tmp_b;
End;

Procedure tnWindow.DrawBox(LineStyle,x1,y1,x2,y2,att : Integer);
Begin
   tmp_b := dorefresh;
   dorefresh := visible;
   nDrawBox(wn,LineStyle,x1,y1,x2,y2,att);
   dorefresh := tmp_b;
End;

Function tnWindow.Rows : integer;
Begin
   Rows := nRows(wn);
End;

Function tnWindow.Cols : integer;
Begin
   Cols := nCols(wn);
End;

Function tnWindow.GetX : integer;
Var
   x,y : longint;
Begin
   getbegyx(win,y,x);
   GetX := x+1;
End;

Function tnWindow.GetY : integer;
Var
   x,y : longint;
Begin
   getbegyx(win,y,x);
   GetY := y+1;
End;

Function tnWindow.IsFramed : boolean;
Begin
   IsFramed := hasframe;
End;

Function tnWindow.IsVisible : boolean;
Begin
   IsVisible := visible;
End;

Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : integer) : shortstring;
var
   tmp_ec : tnec;
Begin
   { save global ec}
   tmp_ec := nEC;
   { init global ec to window ec }
   nEC := ec;
   Edit := nEdit(wn,x,y,att,z,CursPos,es,ch);
   { re-init window ec to possible changed values }
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   { init global ec to saved }
   nEC := tmp_ec;
End;

Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:shortstring;Var ch : AnsiChar) : shortstring;
var
   i : integer;
Begin
   Edit := Edit(x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ overload for longint }
Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : integer) : LongInt;
var
   tmp_ec : tnec;
Begin
   tmp_ec := nEC;
   nEC := ec;
   Edit := nEdit(wn,x,y,att,z,CursPos,es,ch);
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   nEC := tmp_ec;
End;

Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:LongInt;Var ch : AnsiChar) : LongInt;
var
   i : integer;
Begin
   Edit := Edit(x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ overload for real }
Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:Real;Var ch : integer) : Real;
var
   tmp_ec : tnec;
Begin
   tmp_ec := nEC;
   nEC := ec;
   Edit := nEdit(wn,x,y,att,z,CursPos,es,ch);
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   nEC := tmp_ec;
End;

Function tnWindow.Edit(x,y,att,z,CursPos:Integer;es:Real;Var ch : AnsiChar) : Real;
var
   i : integer;
Begin
   Edit := Edit(x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

Function tnWindow.EditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : real;var esc : boolean) : real;
var
   tmp_ec : tnec;
Begin
   tmp_ec := nEC;
   nEC := ec;
   EditNumber := nEditNumber(wn,x,y,att,wid,decm,bgd,initv,minv,maxv,esc);
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   nEC := tmp_ec;
End;

Function tnWindow.EditNumber(x,y,att,wid,decm : integer;bgd : shortstring;initv,minv,maxv : longint;var esc : boolean) : longint;
var
   tmp_ec : tnec;
Begin
   tmp_ec := nEC;
   nEC := ec;
   EditNumber := nEditNumber(wn,x,y,att,wid,decm,bgd,initv,minv,maxv,esc);
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   nEC := tmp_ec;
End;

Function tnWindow.EditDate(x,y,att : integer;initv : shortstring;var esc : boolean) : shortstring;
var
   tmp_ec : tnec;
Begin
   tmp_ec := nEC;
   nEC := ec;
   EditDate := nEditDate(wn,x,y,att,initv,esc);
   ec.ClearMode := nEC.ClearMode;
   ec.InsMode := nEC.InsMode;
   nEC := tmp_ec;
End;

{--------------------------- tnEC -------------------------------}

Constructor tnEC.Init(ft,ih,im,em,ap : boolean;
                                 s,p : shortstring;
                                  cc : integer;
                                  mp : nChMap);
Begin
   ClearMode := ft;
   IsHidden := ih;
   InsMode := im;
   ExitMode := em;
   AppendMode := ap;
   Special := s;
   Picture := p;
   CtrlColor := cc;
   ChMap := mp;
End;

Destructor tnEC.Done;
Begin
End;

{ Add or replace a character map }
{ Preferred }
Function tnEC.AddChMap(_in,_out : integer) : integer;
Var
   i : integer;
Begin
   i := 0;
   Repeat
      inc(i);
   Until (i > nMaxChMaps) or (ChMap[i,1] = _in) or (ChMap[i,1] = 0);
   If i <= nMaxChMaps Then Begin
      AddChMap := i;
      ChMap[i,1] := _in;
      ChMap[i,2] := _out;
   End Else
      AddChMap := 0;
End;

{ Add or replace a character map }
{ Obsolete, overloaded }
Function tnEC.AddChMap(mp : nChMapStr) : integer;
Var
   i : integer;
   _in,_out : integer;
Begin
   { convert to new type }
   If mp[1] = #0 Then
      _in := ord(mp[2]) * (-1)
   Else
      _in := ord(mp[1]);
   If mp[3] = #0 Then
      _out := ord(mp[4]) * (-1)
   Else
      _out := ord(mp[3]);
   AddChMap := AddChMap(_in,_out);
End;

Procedure tnEC.ClrChMap(idx : integer);
Begin
   Case idx of
      0 : FillChar(ChMap,SizeOf(ChMap),0);
      1..nMaxChMaps : Begin
         ChMap[idx,1] := 0;
         ChMap[idx,2] := 0;
      End;
   End;
End;

{==========================================================================}

{ set the active window for write(ln), read(ln) }
Procedure nSetActiveWin(win : pwindow);
Begin
   SetActiveWn(win);
End;

{----------------------------------------------------------------
  Set the refresh toggle.
  If true, then all changes to a window are immediate. If false,
  then changes appear following the next call to nRefresh.
 ----------------------------------------------------------------}
Procedure nDoNow(donow : boolean);
Begin
   dorefresh := donow;
End;

{-----------------------------------------------------
  Set the echo flag.
  This determines whether or not, characters are
  echoed to the display when entered via the keyboard.
 -----------------------------------------------------}
Procedure nEcho(b : boolean);
Begin
   Case b of
      true : echo;
      false: noecho;
   End;
   isEcho := b;
End;

{ create a new subwindow of stdscr }
Procedure nWindow(var win : pWindow; x,y,x1,y1 : integer);
Begin
   nDelWindow(win);
   win := subwin(stdscr,y1-y+1,x1-x+1,y-1,x-1);
   If win = nil then Exit;
   intrflush(win,bool(false));
   keypad(win,bool(true));
   scrollok(win,bool(true));
   SetActiveWn(win);
End;

{ create a new window }
Procedure nNewWindow(var win : pWindow; x,y,x1,y1 : integer);
Begin
   nDelWindow(win);
   win := newwin(y1-y+1,x1-x+1,y-1,x-1);
   If win = nil then Exit;
   intrflush(win,bool(false));
   keypad(win,bool(true));
   scrollok(win,bool(true));
   SetActiveWn(win);
End;

{ repaint a window }
Procedure nRefresh(win : pWindow);
Begin
   touchwin(win);
   wrefresh(win);
End;

{----------------------------------------------
 Wait for a key to be pressed, with a timeout.
 If a key is pressed, then nKeypressed returns
 immediately as true, otherwise it return as
 false after the timeout period.
 ----------------------------------------------}
function nKeypressed(timeout : word) : boolean;
var
   fds : TFDSet;
   maxFD : longint;
Begin
   fpFD_Zero(fds);
   maxFD := 1;
   { turn on stdin bit }
   If fpFD_IsSet(STDIN,fds)=0 Then
     fpFD_Set(STDIN,fds);
   { wait for some input }
   If fpSelect(maxFD,@fds,nil,nil,timeout) > 0 Then
      nKeypressed := TRUE
   Else
      nKeypressed := FALSE;
End;

{---------------------------------
  read input shortstring from a window
 ---------------------------------}
Function nReadln(win : pWindow) : shortstring;
Begin
   wgetstr(win,ps);
   nReadln := StrPas(ps);
End;

{ write a shortstring to a window without refreshing screen }
{ DON'T update PrevWn! }
Procedure nWriteScr(win : pWindow; x,y,att : integer; s : shortstring);
Var
   tmp : pwindow;
Begin
   tmp := ActiveWn;
   tmp_b := doRefresh;
   ActiveWn := win;
   doRefresh := false;
   nFWrite(win,x,y,att,0,s);
   ActiveWn := tmp;
   doRefresh := tmp_b;
End;

{----------------------------------------------------------
  Scroll a window, up or down, a specified number of lines.
  lines = number of lines to scroll.
  dir = direction, up or down.
 ----------------------------------------------------------}
Procedure nScroll(win : pWindow; lines : integer; dir : tnUpDown);
Begin
   ScrollOk(win,bool(True));
   Case dir of
        up : lines := abs(lines);
      down : lines := abs(lines) * (-1);
   End;
   wscrl(win,lines);
   If doRefresh Then wRefresh(win);
End;

{ draw a colored box, with or without a border }
Procedure nDrawBox(win : pWindow; LineStyle,x1,y1,x2,y2,att : Integer);
Var
   sub : pWindow;
   x,y : longint;
Begin
   getbegyx(win,y,x);
   sub := subwin(win,y2-y1+1,x2-x1+1,y+y1-1,x+x1-1);
   If sub = nil Then exit;
   wbkgd(sub,CursesAtts(att));
   werase(sub);
   case LineStyle of
      1,2 : box(sub, ACS_VLINE, ACS_HLINE);
   End;
   If doRefresh Then wrefresh(sub);
   nDelWindow(sub);
End;

{---------------------------
  add a border to a window,
  waits for a refresh
 ---------------------------}
Procedure nFrame(win : pWindow);
Begin
   box(win, ACS_VLINE, ACS_HLINE);
End;

{-----------------------------------------------------------
  write a string to a window at the current cursor position
  followed by a newline
 -----------------------------------------------------------}
Procedure nWriteln(win : pWindow; s : shortstring);
Begin
   waddstr(win,StrPCopy(ps,s+#10));
   If doRefresh Then wrefresh(win);
End;

{ return then number of rows in a window }
Function nRows(win : pWindow) : integer;
Var
   x,y : longint;
Begin
   getmaxyx(win,y,x);
   nRows := y;
End;

{ return then number of columns in a window }
Function nCols(win : pWindow) : integer;
Var
   x,y : longint;
Begin
   getmaxyx(win,y,x);
   nCols := x;
End;

{-------------------------------------------------------
 Line drawing characters have to be handled specially.
 Use nWriteAC() to write these characters. They cannot
 be simply included as characters in a string.
 -------------------------------------------------------}

{ returns horizontal line character }
Function nHL : longint;
Begin
   nHL := ACS_HLINE;
End;

{ returns vertical line character }
Function nVL : longint;
Begin
   nVL := ACS_VLINE;
End;

{ returns upper left corner character }
Function nUL : longint;
Begin
   nUL := ACS_ULCORNER;
End;

{ returns lower left corner character }
Function nLL : longint;
Begin
   nLL := ACS_LLCORNER;
End;

{ returns upper right corner character }
Function nUR : longint;
Begin
   nUR := ACS_URCORNER;
End;

{ returns lower right corner character }
Function nLR : longint;
Begin
   nLR := ACS_LRCORNER;
End;

{ returns left tee character }
Function nLT : longint;
Begin
   nLT := ACS_LTEE;
End;

{ returns right tee character }
Function nRT : longint;
Begin
   nRT := ACS_RTEE;
End;

{ returns top tee character }
Function nTT : longint;
Begin
   nTT := ACS_TTEE;
End;

{ returns bottom tee character }
Function nBT : longint;
Begin
   nBT := ACS_BTEE;
End;

{ returns plus/cross character }
Function nPL : longint;
Begin
   nPL := ACS_PLUS;
End;

{ returns left arrow character }
Function nLA : longint;
Begin
   nLA := ACS_LARROW;
End;

{ returns right arrow character }
Function nRA : longint;
Begin
   nRA := ACS_RARROW;
End;

{ returns up arrow character }
Function nUA : longint;
Begin
   nUA := ACS_UARROW;
End;

{ returns down arrow character }
Function nDA : longint;
Begin
   nDA := ACS_DARROW;
End;

{ returns diamond character }
Function nDI : longint;
Begin
   nDI := ACS_DIAMOND;
End;

{ returns checkerboard character }
Function nCB : longint;
Begin
   nCB := ACS_CKBOARD;
End;

{ returns degree character }
Function nDG : longint;
Begin
   nDG := ACS_DEGREE;
End;

{ returns plus/minus character }
Function nPM : longint;
Begin
   nPM := ACS_PLMINUS;
End;

{ returns bullet character }
Function nBL : longint;
Begin
   nBL := ACS_BULLET;
End;

{ draw a horizontal line with color and a start & end position }
Procedure nHLine(win : pwindow; col,row,attr,x : integer);
var
   sub : pwindow;
   bx,by : longint;
Begin
   getbegyx(win,by,bx);
   sub := subwin(win,1,x-col+1,by+row-1,bx+col-1);
   If sub = nil Then Exit;
   x := getmaxx(sub);
   wbkgd(sub,CursesAtts(attr));
   mvwhline(sub,0,0,ACS_HLINE,x);
   If doRefresh Then wrefresh(sub);
   delwin(sub);
End;

{ draw a vertical line with color and a start & end position }
Procedure nVLine(win : pwindow; col,row,attr,y : integer);
var sub : pwindow;
Begin
   sub := subwin(win,y-row+1,1,row-1,col-1);
   If sub = nil Then Exit;
   wbkgd(sub,CursesAtts(attr));
   mvwvline(sub,0,0,ACS_VLINE,y);
   If doRefresh Then wrefresh(sub);
   delwin(sub);
End;

{----------------------------------------------------------------
  Write a character from the alternate character set. A normal
  value from the alternate character set is larger than $400000.
  If the value passed here is 128..255, then we assume it to be
  the ordinal value from the IBM extended character set, and try
  to map it to curses correctly. If it does not map, then we just
  make it an alternate character and hope the output is what the
  programmer expected. Note: this will work on the Linux console
  just fine, but for other terminals the passed value must match
  the termcap definition for the alternate character.
  Note: The cursor returns to it's original position.
 ----------------------------------------------------------------}
Procedure nWriteAC(win : pwindow; x,y : integer; att,acs_char : longint);
var
   xx,yy,
   cp : longint;
Begin
   If acs_char in [0..255] Then Begin
      Case acs_char of
         176 : acs_char := ACS_CKBOARD;
         179 : acs_char := ACS_VLINE;
         180 : acs_char := ACS_RTEE;
         191 : acs_char := ACS_URCORNER;
         192 : acs_char := ACS_LLCORNER;
         193 : acs_char := ACS_BTEE;
         194 : acs_char := ACS_TTEE;
         195 : acs_char := ACS_LTEE;
         196 : acs_char := ACS_HLINE;
         197 : acs_char := ACS_PLUS;
         218 : acs_char := ACS_ULCORNER;
         217 : acs_char := ACS_LRCORNER;
         241 : acs_char := ACS_PLMINUS;
         248 : acs_char := ACS_DEGREE;
         249 : acs_char := ACS_BULLET;
         else  acs_char := acs_char or A_ALTCHARSET;
      End;
   End;
   { save the current cursor position }
   getyx(win,yy,xx);
   cp := nSetColorPair(att);
   { write character with current attributes }
   mvwaddch(win,y-1,x-1,acs_char);
   { update with new attributes }
   If nIsBold(att) Then
      att := A_BOLD or A_ALTCHARSET
   Else
      att := A_NORMAL or A_ALTCHARSET;
   mvwchgat(win,y-1,x-1,1,att,cp,Nil);
   { return cursor to saved position }
   wmove(win,yy,xx);
   If doRefresh Then wrefresh(win);
End;

{-------------------------------------------------------------------
 write a string to stdscr with color, without moving the cursor

   Col    = x start position
   Row    = y start position
   Attrib = color (0..127), note color = (background*16)+foreground
   Clear  = clear line up to x position
   s      = string to write
 -------------------------------------------------------------------}
Procedure nFWrite(win : pwindow; col,row,attrib : integer; clear : integer; s : shortstring);
var
   clr : array [0..255] of AnsiChar;
   cs : shortstring;
   sub : pWindow;
   x,y,
   mx,my,
   xx,yy : longint;
   ctrl : boolean;
Begin
   if Clear > 0 Then Begin
      FillChar(clr,SizeOf(clr),' ');
      clr[SizeOf(clr)-1] := #0;
      If Clear > MaxCols Then Clear := MaxCols;
      cs := Copy(StrPas(clr),1,(Clear-Col)-Length(s)+1);
   End Else
      cs := '';
   s := s+cs;
   If s = '' Then Exit;
   getyx(win,yy,xx);
   getbegyx(win,y,x);
   getmaxyx(win,my,mx);
   If Length(s) > mx Then s := Copy(s,1,mx);
   sub := subwin(win,1,Length(s),y+row-1,x+col-1);
   If sub = nil Then Exit;
   cs := s;
   ctrl := false;
   { look for embedded control characters }
   For x := 1 to Length(s) Do Begin
      If s[x] in [#0..#31] Then Begin
         s[x] := ' ';
         ctrl := true;
      End;
   End;
   wbkgd(sub,COLOR_PAIR(nSetColorPair(Attrib)));
   If nisbold(Attrib) then
      wattr_on(sub,A_BOLD,Nil);
   mvwaddstr(sub,0,0,StrPCopy(ps,s));
   { highlight the embedded control characters substitutes }
   If ctrl Then Begin
      { nEC is always the current edit control object }
      If Attrib <> nEC.CtrlColor Then
         nWinColor(sub,nEC.CtrlColor)
      Else Begin
         { reverse the highlight color if same as current attribute }
         bg := nEC.CtrlColor div 16;
         fg := nEC.CtrlColor - (bg * 16);
         While bg > 7 Do dec(bg,8);
         While fg > 7 Do dec(fg,8);
         nWinColor(sub,(fg*16)+bg);
      End;
      For x := 1 to Length(cs) Do Begin
         If cs[x] in [#0..#31] Then
            mvwaddch(sub,0,x-1,ord(cs[x])+64);
      End;
   End;
   If doRefresh Then wrefresh(sub);
   delwin(sub);
   wmove(win,yy,xx);
End;

{ overload - no pointer }
Procedure nFWrite(col,row,attrib : integer; clear : integer; s : shortstring);
Begin
   nFWrite(ActiveWn,col,row,attrib,clear,s);
End;

{ compatibility for the old function name }
Function nSEdit(win : pwindow; x,y,att,z,CursPos:integer;
                es:shortstring;var ch : AnsiChar) : shortstring;
Var
   s : shortstring;
Begin
   s := nEdit(win,x,y,att,z,CursPos,es,ch);
   nSEdit := s;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
{                            String Editor                           }
Function nEdit(win : pwindow;     { window to work in }
               x,y,               { base x,y coordinates of edit region }
               att,               { color attribute }
               z,                 { right-most column of edit region }
               CursPos:integer;   { place cursor on this column at start }
               es:shortstring;         { initial value of shortstring }
               var chv : integer  { ordinal value of character typed, }
                                  { negative for extended keys }
               ) : shortstring;
Var
   ZMode,
   AppendMode,
   SEditExit : boolean;
   prvx,
   prvy,
   pidx,
   pres,
   Index : integer;
   ts,
   hes : shortstring;
   isextended : boolean;
   ch : AnsiChar;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure NewString;
BEGIN
   nEdit := es;
   hes := es;
   FillChar(hes[1],Length(hes),'*');
END;

Procedure WriteString;
Var
   xx,yy : integer;
Begin
   xx := nWhereX(win);
   yy := nWhereY(win);
   If nEC.IsHidden Then
      nFWrite(win,x,y,att,z,hes)
   Else
      nFWrite(win,x,y,att,z,es);
   nGotoXY(win,xx,yy);
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EInsMode;
Begin
   nEC.InsMode := (not nEC.InsMode)
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure WriteChar;
var s : shortstring;
Begin
   ts := es;
   If AppendMode Then Begin
      es := es + ' ';
      Index := Length(es);
   End Else Begin
      If nWhereX(win) >= Length(es)+x Then Repeat
         es := es + ' ';
      Until Length(es)+x-1 = nWhereX(win);
      If es = '' Then es := ' ';
      If Length(es)+x-1 = nWhereX(win) Then Index := Length(es);
   End;
   es[Index] := ch;
   s := Copy(es,1,Index);
   If nCheckPxPicture(s,nEC.Picture,pidx) <> 0 Then Begin
      { no error, picture satisfied }
      If (Length(s) > Length(es)) or
         ((Length(s) = Length(es)) and (s <> es)) Then Begin
         { expanded/changed by picture }
         es := s;
      End;
      If pidx > Index Then Begin
         If pidx > Length(es) Then pidx := Length(es);
         If pidx > Index Then Index := pidx;
      End;
   End Else Begin
      { error, did not fit the picture }
      Sound(1000);
      Delay(50);
      NoSound;
      es := ts;
      Dec(Index);
   End;
   NewString;
   WriteString;
   If (Index < z-x+1) or not ZMode Then Begin
      Index := Index+1;
      nGotoXY(win,x+Index-1,y);
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EInsert;            { Insert      }
Begin
   If Length(es) < Z-X+1 Then Begin
      ts := es;
      Insert(' ',es,Index);
      If nCheckPXPicture(es,nEC.Picture,pidx) = 0 Then Begin
         Sound(1000);
         Delay(50);
         NoSound;
         es := ts;
         ch := #255;
      End;
      NewString;
      WriteString;
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EDelete;            { Delete      }
Begin
   ts := es;
   Delete(es,Index,1);
   If nCheckPXPicture(es,nEC.Picture,pidx) = 0 Then Begin
      Sound(1000);
      Delay(50);
      NoSound;
      es := ts;
      ch := #255;
   End;
   NewString;
   WriteString;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ECtrlEnd;           { <CTRL> End  }
Begin
   Delete(es,Index,Length(es));
   NewString;
   WriteString;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EHome;             { Home        }
Begin
   Index := 1;
   nGotoXY(win,x,y);
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ELeftArrow;         { Left Arrow  }
Begin
   If nWhereX(win) > x Then Begin
      dec(Index);
      nGotoXY(win,nWhereX(win)-1,nWhereY(win));
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ERightArrow;       { Right Arrow }
Begin
   If Index < z-x+1 Then Begin
      nGotoXY(win,nWhereX(win)+1,nWhereY(win));
      Index := Index + 1;
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EEnd;               { End         }
Begin
   Index := Length(es)+1;
   If Index > z-x+1 Then Index := Length(es);
   If Index < 1 Then Index := 1;
   If Index > MaxCols Then Index := MaxCols;
   nGotoXY(win,x+(Index-1),y);
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure EBackSpace;          { Backspace  }
Begin
   Index := Index - 1;
   If Index < 1 Then Begin
      Index := 1;
      Exit;
   End Else
      If nWhereX(win) > x Then nGotoXY(win,nWhereX(win) - 1,nWhereY(win));
   Delete(es,Index,1);
   NewString;
   WriteString;
   nGotoXY(win,x+(Index-1),y);
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ETurboBackSpace; { Ctrl/Backspace  }
Begin
   If Index = 1 Then Exit;
   Delete(es,1,Index-1);
   NewString;
   Index := 1;
   If nWhereX(win) > x Then nGotoXY(win,1,nWhereY(win));
   WriteString;
   nGotoXY(win,x,y);
END;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ECtrlLeftArrow;{ Ctrl Left Arrow }
Begin
   If nEC.IsHidden Then Begin
      EHome;
      Exit;
   End;
   If es[Index-1] = ' ' Then Index := Index-1;
   If es[Index] <> ' ' Then Begin
      While (Index > 1) And (es[Index] <> ' ') Do
         Index := Index-1;
   End Else
   If es[Index] = ' ' Then Begin
      While (Index > 1) And (es[Index] = ' ') Do
         Index := Index-1;
      While (Index > 1) And (es[Index] <> ' ') Do
         Index := Index-1;
   End;
   If Index = 1 Then
      nGotoXY(win,x,y)
   Else Begin
      nGotoXY(win,x+Index,y);
      Index := Index+1;
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ECtrlRightArrow;{ Ctrl Right Arrow  }
Begin
   If nEC.IsHidden Then Begin
      EEnd;
      Exit;
   End;
   While (Index < Length(es)) And (es[Index] <> ' ') Do
   Begin
        Index := Index+1;
   End;
   While (Index < Length(es)) And (es[Index] = ' ') Do
   Begin
        Index := Index+1;
   End;
   nGotoXY(win,x+Index-1,y);
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure CheckForWriteChar(embed : boolean);
Begin
   If embed or Not (Ch In [#27,#255]) Then Begin
      If (ch in [#10,#13]) and (not embed) {and not ControlKey} Then exit;
      If nEC.ClearMode Then Begin
         es := '';
         WriteString;
         nGotoXY(win,X,Y);
         Index := 1;
         WriteChar;
         nEC.ClearMode := False;
      End Else Begin
         If nEC.InsMode Then Begin
            EInsert;
            WriteChar;
         End Else WriteChar;
      End;
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ProcessSpecialKey;
begin
   If ch = #129 Then ch := #68; { Linux, map Esc/0 to F10 }
   chv := ord(ch) * (-1);       { set the return value }

   Case ch of
   #16..#25,
   #30..#38,
   #44..#50,
   #59..#68,
   #84..#90,
  #92..#113,
       #118,
       #132,
        #72,
        #73,
        #80,
        #81 : Begin SEditExit:=True;Exit;End;
        #71 : EHome;
        #75 : ELeftArrow;
        #77 : ERightArrow;
        #79 : EEnd;
        #82 : EInsMode;
        #83 : EDelete;
        #15,
       #115 : ECtrlLeftArrow;
       #116 : ECtrlRightArrow;
       #117 : ECtrlEnd;
   End;
End;

{~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure ProcessNormalKey;
Var
   i : integer;
   ctrl : boolean;
begin
   chv := ord(ch); { set the return value }
   For i := 1 to Length(nEC.Special) Do Begin
      If ch = nEC.Special[i] Then Begin
         SEditExit:=True;
         Exit;
      End;
   End;
   ctrl := false;
   { standard control key assignments }
   case ch of
      #0..#15,
      #17..#31 : Begin
         nEC.ClearMode := False;
         Case ch of
            #1 : EHome;
            #5 : EEnd;
            #2 : ELeftArrow;
            #6 : ERightArrow;
           #19 : ECtrlLeftArrow;
            #4 : ECtrlRightArrow;
            #7 : EDelete;
            #9 : EInsMode;
            #8 : EBackSpace;
           #10 : ch := #13;
           #13 : Begin
                    pres := nCheckPxPicture(es,nEC.Picture,pidx);
                    If pres <> 2 Then Begin
                       Sound(1000);
                       Delay(50);
                       NoSound;
                       ch := #255;
                    End;
                 End;
           #27 : If KeyPressed Then Begin
                    { covers up a Linux peculiarity where the next }
                    { character typed bleeds through with esc/1..9 }
                    nGotoXY(win,prvx,prvy);
                    WriteString;
                    ch := ReadKey;
                    { make it a function key }
                    If ch in ['1'..'9'] Then Begin
                       ch := AnsiChar(Ord(ch)+10);
                       chv := ord(ch) * (-1);
                    End Else ch := #27;
                    SEditExit := true;
                 End;
         End;
         Exit;
      End;
      #16 : Begin
               { embed control characters in the shortstring }
               ch := UpCase(ReadKey);
               If ch in ['@','2','A'..'Z'] Then Begin
                  ctrl := true;
                  If ch = '2' Then ch := '@';
                  ch := AnsiChar(Ord(ch)-64);
                  chv := ord(ch);
               End;
            End;
     #127 : Begin nEC.ClearMode := False;ETurboBackSpace;Exit;End;
   end;
   CheckForWriteChar(ctrl);
   ch := #0;
end;

{-----------------------------------------------------------------------
  Map a keystroke to another character, normal or extended.

  The maps are 4 character strings interpreted as 2 sets of character
  pairs that represent the following:

  1st AnsiChar - If it is #0 then it is an extended AnsiChar. Use the 2nd
             character to identify.
  2nd AnsiChar - Only used if 1st AnsiChar is #0.

  The first pair of the shortstring is the actual key pressed.
  The second pair is what that key should be become.

  #0#59 = F1, extended key
  #59#0 = ; , normal key

  So a map of #0#59#59#0 maps the F1 key to the ; key,
          and #0#59#0#60 maps the F1 key to the F2 key,
          and #0#59#0#0 maps the F1 key to a null.

   Examples:
     #0#59#0#60 = map F1 to F2
     #1#0#0#59  = map ^A to F1
     #0#59#1#0  = map F1 to ^A
     #0#59#0#0  = map F1 to ^@ (null)
     #0#0#0#59  = map ^@ to F1
     #97#0#65#0 = map a to A
}
Procedure MapKey(var ch : AnsiChar;var eflag : boolean);
Var
   i,
   cv : integer;
   s2 : string[2];
   s4 : string[4];
Begin
   cv := Ord(ch);
   If eflag Then cv := cv * (-1);
   i := 0;
   { look for a character map assignment }
   Repeat
      inc(i);
   Until (i > nMaxChMaps) or (nEC.ChMap[i,1] = cv);
   { if found, then re-assign ch to the mapped key }
   If i <= nMaxChMaps Then Begin
      cv := nEC.ChMap[i,2];
      eflag := (cv < 0);
      ch := chr(abs(cv));
   End;
(*
   { look for a character map assignment }
   i := 0;
   s4 := #0#0#0#0;
   Case eflag of
      true  : s2 := #0+ch;
      false : s2 := ch+#0;
   End;
   Repeat
      inc(i);
   Until (i > nMaxChMaps) or (pos(s2,nEC.ChMap[i]) = 1);
   { if found, then re-assign ch to the mapped key }
   If i <= nMaxChMaps Then Begin
      system.Move(nEC.ChMap[i,1],s4[1],Length(nEC.ChMap[i]));
      s2 := Copy(s4,3,2);
      eflag := (s2[1] = #0);
      Case eflag of
         true  : ch := s2[2];
         false : ch := s2[1];
      End;
      If ch = #0 Then eflag := false;
   End;
*)
End;

{============================================================================}
Begin
   SEditExit := nEC.ExitMode;
   AppendMode := nEC.AppendMode;
   ZMode := z <> 0;
   If CursPos > Length(es)+x Then
      Index := Length(es)+1                { End Of String    }
   Else Index := CursPos+1-x;              { Inside Of String }
   If Not ZMode then z := x+length(es);
   Newstring;
   WriteString;
   nGotoXY(win,CursPos,y);
   Repeat
      prvx := nWhereX(win); { save for ProcessNormalKey }
      prvy := nWhereY(win);
      If Not ZMode then z := x+length(es);
      ch := ReadKey;
      isextended := (ch = #0);
      If isextended Then
         ch := ReadKey;
      MapKey(ch,isextended);
      If isextended Then
         ProcessSpecialKey
      Else
         ProcessNormalKey;
   Until (ch In [#13,#27]) or SEditExit;
   nEC.ClearMode := False;
   NewString;
End;{ of nEdit }

{ compatibility for old ch type }
Function nEdit(win : pwindow; x,y,att,z,CursPos:integer;
                es:shortstring;var ch : AnsiChar) : shortstring;
Var i : integer;
Begin
   nEdit := nEdit(win,x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ nEdit using currently active window }
Function nEdit(x,y,att,z,CursPos:integer;
               es:shortstring;var ch : integer) : shortstring;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,ch);
End;

Function nEdit(x,y,att,z,CursPos:integer;
               es:shortstring;var ch : AnsiChar) : shortstring;
Var i : integer;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,i);
   ch := chr(ord(i));
End;

{ overload for longint type }
Function nEdit(x,y,att,z,CursPos:integer;
               es:longint;var ch : integer) : longint;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,ch);
End;

Function nEdit(x,y,att,z,CursPos:integer;
               es:longint;var ch : AnsiChar) : longint;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,ch);
End;

{ longint with pointer }
Function nEdit(win : pwindow; x,y,att,z,CursPos:integer;
                es:LongInt;var ch : integer) : LongInt;
Var
   savpic,
   ess : string;
   esv,
   err : longint;
Begin
   Str(es:0,ess);
   savpic := nEC.Picture;
   If savpic = '' Then nEC.Picture := '[-]#*#';
   ess := nEdit(win,x,y,att,z,CursPos,ess,ch);
   nEC.Picture := savpic;
   val(ess,esv,err);
   nEdit := esv;
End;

Function nEdit(win : pwindow; x,y,att,z,CursPos:integer;
               es:longint;var ch : AnsiChar) : longint;
Var i : integer;
Begin
   nEdit := nEdit(win,x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ overload for real type }
Function nEdit(x,y,att,z,CursPos:integer;
               es:real;var ch : integer) : real;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,ch);
End;

Function nEdit(x,y,att,z,CursPos:integer;
               es:real;var ch : AnsiChar) : real;
Var i : integer;
Begin
   nEdit := nEdit(ActiveWn,x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ with pointer }
Function nEdit(win : pwindow; x,y,att,z,CursPos:integer;
                es:Real;var ch : integer) : Real;
Var
   savpic,
   ess : string;
   esv : real;
   i,
   err : Integer;
Begin
   Str(es:0:12,ess);
   While ess[Length(ess)] = '0' Do Delete(ess,Length(ess),1);
   savpic := nEC.Picture;
   If savpic = '' Then Begin
      Case nDecFmt of
         nUS   : nEC.Picture := '[+,-]#*#[[.*#][{E,e}[+,-]#[#][#][#]]]';
         nEURO : Begin
                    nEC.Picture := '[+,-]#*#[[;,*#][{E,e}[+,-]#[#][#][#]]]';
                    For i := 1 to Length(ess) Do
                       If ess[i] = '.' Then ess[i] := ',';
                 End;
      End;
   End;
   ess := nEdit(win,x,y,att,z,CursPos,ess,ch);
   nEC.Picture := savpic;
   For i := 1 to Length(ess) Do If ess[i] = ',' Then ess[i] := '.';
   val(ess,esv,err);
   nEdit := esv;
End;

Function nEdit(win : pwindow; x,y,att,z,CursPos:integer;
               es:real;var ch : AnsiChar) : real;
Var i : integer;
Begin
   nEdit := nEdit(win,x,y,att,z,CursPos,es,i);
   ch := chr(abs(i));
End;

{ And now some sugar for Rainer Hantsch! }
{------------------------------------------------------------------------
  This is a right justified number editor. As a digit is typed, the
  existing number string gets pushed left and the new digit is appended.
  If decimal columns are specified, then pressing <space> will enter the
  decimal character (. or ,). A background string can be specified that
  fills the empty spaces.
 ------------------------------------------------------------------------}
Function nEditNumber(
       win : pwindow;
         x,              { edit field start column }
         y,              { edit field start row }
       att,              { edit field color attribute }
       wid,              { edit field width }
      decm : integer;    { number of decimal columns }
       bgd : shortstring;     { background string -
                           if bgd = '', then no background
                           if bgd = a single character, then is used as the
                           background fill character.
                           if bgd length is longer than wid, then the entire
                           bgd string is used as the background.}
     initv,              { initial value }
      minv,              { range minimum value }
      maxv  : real;      { range maximum value }
   var esc : boolean     { if Esc key pressed = true, else = false }
) : real;

Const
   { up to 12 decimal places }
   decs : shortstring = '[#][#][#][#][#][#][#][#][#][#][#][#]';
Var
   r : real;
   s,s1,s2 : shortstring;
   i,
   e,
   bc,
   bx : integer;
   ch : AnsiChar;
   fill : array [0..255] of AnsiChar;
   tmp_ec : tnEC;
Begin
   tmp_ec := nEC;
   nEC.ExitMode := true;
   nEC.AppendMode := true;
   nEC.ClrChMap(0);
   nEC.AddChMap(#7#0#0+AnsiChar(nKeyDel));
   nEC.AddChMap(#8#0#0+AnsiChar(nKeyDel));
   If decm > (Length(decs) div 3) Then
      decm := (Length(decs) div 3);
   If decm >= wid Then decm := (wid - 1);
   If decm > 0 Then Begin
      nEC.Picture := '[-]*#[{.}'+Copy(decs,1,(decm*3))+']';
      If nDecFmt = nEURO Then Begin
         nEC.Picture[8] := ',';
         Insert(';',nEC.Picture,8);
         nEC.AddChMap('.'+#0+','+#0);
      End;
   End Else
      nEC.Picture := '[-]*#';
   If bgd = '' Then Begin
      bgd := ' ';
      bc := att;
   End Else
      bc := nEC.CtrlColor;
   If Length(bgd) < wid Then Begin
      FillChar(fill,wid,bgd[1]);
      fill[wid] := #0;
      bgd := StrPas(fill);
   End;
   bx := x;
   If Length(bgd) > wid Then inc(x);
   str(initv:wid:decm,s);
   While s[1] = ' ' Do Delete(s,1,1);
   If Pos('.',s) <> 0 Then
      While s[Length(s)] = '0' Do Delete(s,Length(s),1);
   If decm = 0 Then Delete(s,Pos('.',s),1);
   If nDecFmt = nEURO Then For i := 1 to Length(s) Do
      If s[i] = '.' Then s[i] := ',';
   Repeat
      nFWrite(win,bx,y,bc,bx+Length(bgd)-(x-bx),copy(bgd,1,wid-length(s)+(x-bx)));
      If x > bx Then
         nFWrite(win,x+wid,y,bc,0,copy(bgd,wid+2,length(bgd)));
      s1 := nEdit(win,x+wid-Length(s),y,att,x+wid-1,x+wid-1,s,ch);
      s2 := s1;
      If nDecFmt = nEURO Then For i := 1 to Length(s2) Do
         If s2[i] = ',' Then s2[i] := '.';
      val(s2,r,e);
      If (s1 = '') or ((e = 0) and (r >= minv) and (r <= maxv)) Then
         s := s1
      Else
         If ch <> #27 then Begin
            ch := #0;
            Sound(1000);
            Delay(50);
            NoSound;
         End;
      nEC.AppendMode := Length(s) < wid;
   Until ch in [#13,#27];
   esc := (ch = #27);
   nEditNumber := r;
   nEC := tmp_ec;
End;

{ overload - real, no pointer }
Function nEditNumber(
   x,y,att,wid,decm : integer;
                bgd : shortstring;
              initv,
               minv,
               maxv : real;
            var esc : boolean) : real;
Begin
   nEditNumber := nEditNumber(ActiveWn,x,y,att,wid,decm,bgd,initv,minv,maxv,esc);
End;

{ overload for longint }
Function nEditNumber(
                win : pwindow;
   x,y,att,wid,decm : integer;
                bgd : shortstring;
              initv,
               minv,
               maxv : longint;
            var esc : boolean) : longint;
Var
   r : real;
Begin
   r := nEditNumber(win,x,y,att,wid,0,bgd,Real(initv),Real(minv),Real(maxv),esc);
   nEditNumber := Trunc(r);
End;

{ overload - longint, no pointer }
Function nEditNumber(
   x,y,att,wid,decm : integer;
                bgd : shortstring;
              initv,
               minv,
               maxv : longint;
            var esc : boolean) : longint;
Var
   r : real;
Begin
   r := nEditNumber(ActiveWn,x,y,att,wid,0,bgd,Real(initv),Real(minv),Real(maxv),esc);
   nEditNumber := Trunc(r);
End;

{ More sugar for Rainer }
{------------------------------------------------------------------------
  A date string editor.
 ------------------------------------------------------------------------}
Function nEditDate(
       win : pwindow;
         x,           { edit field start column }
         y,           { edit field start row }
       att : integer; { edit field color attribute }
     initv : shortstring;     { initial value }
   var esc : boolean     { if Esc key pressed = true, else = false }
) : shortstring;

Var
   s : shortstring;
   i : integer;
   ch : AnsiChar;
   tmp_ec : tnEC;

Begin
   tmp_ec := nEC;
   nEC.InsMode := false;
   nEC.ClearMode := false;
   nEC.ExitMode := false;
   nEC.AppendMode := false;
   Case nDecFmt of
      nUS :  Begin
         nEC.Picture := '{#,m,M}{#,m,M}/{#,d,D}{#,d,D}/{#,y,Y}{#,y,Y}{#,y,Y}{#,y,Y}';
         s := 'mm/dd/yyyy';
      End;
      nEURO : Begin
         nEC.Picture := '{#,d,D}{#,d,D}/{#,m,M}{#,m,M}/{#,y,Y}{#,y,Y}{#,y,Y}{#,y,Y}';
         s := 'dd/mm/yyyy';
      End;
   End;
   If nCheckPxPicture(initv,nEC.Picture,i) <> 0 Then
      system.move(initv[1],s[1],Length(initv));
   nEC.AddChMap(#7#0#0+AnsiChar(nKeyLeft));
   nEC.AddChMap(#8#0#0+AnsiChar(nKeyLeft));
   nEC.AddChMap(#0+AnsiChar(nKeyDel)+#0+AnsiChar(nKeyLeft));
   Repeat
      s := nEdit(win,x,y,att,x+9,x,s,ch);
      If ch = #13 Then Begin
         For i := 1 to Length(s) Do
            If s[i] in ['m','d','y'] Then ch := #0;
      End;
   Until ch in [#13,#27];
   esc := (ch = #27);
   nEditDate := s;
   nEC := tmp_ec;
End;

{ overload - no pointer }
Function nEditDate(x,y,att : integer;initv : shortstring;var esc : boolean) : shortstring;
Begin
   nEditDate := nEditDate(ActiveWn,x,y,att,initv,esc);
End;

{ A one-line procedural wrapper }
Procedure nMakeWindow(
    var win : tnWindow;
    x1,y1,
    x2,y2,
    ta,ba,ha : integer;
    hasframe : boolean;
    hdrpos : tnJustify;
    hdrtxt : shortstring);
Begin
   win.init(x1,y1,x2,y2,ta,hasframe,ba);
   If hdrtxt <> '' Then win.PutHeader(hdrtxt,ha,hdrpos);
End;

{ And with a window pointer }
Procedure nMakeWindow(
    var win : pnWindow;
    x1,y1,
    x2,y2,
    ta,ba,ha : integer;
    hasframe : boolean;
    hdrpos : tnJustify;
    hdrtxt : shortstring);
Begin
   New(win,init(x1,y1,x2,y2,ta,hasframe,ba));
   If hdrtxt <> '' Then win^.PutHeader(hdrtxt,ha,hdrpos);
End;

{--------------------------------------------------------------------
  Display a message in a centered and framed box. With ack set to
  false, the window remains active for further use in the program.

  Inputs:
     msg = message to display
     matt = message color
     hdr  = header text at frame top
     hatt = header/frame color
     ack  = TRUE : display ftr text and wait for a keypress, then
                   remove the window.
            FALSE: don't display ftr, don't wait for a keypress, and
                   don't remove the window.
  Output:
     a nil pointer if ack = true,
     a pointer to the tnWindow object if ack = false
 --------------------------------------------------------------------}
Function nShowMessage(msg : shortstring;
                     matt : byte;
                      hdr : shortstring;
                     hatt : byte;
                      ack : boolean) : pnWindow;
const
   ftr = 'Press Any Key';
   acklns : shortint = 0;
var
   i,j,
   cr,
   wid,
   maxwid,
   lines : integer;
   mwin : pnWindow;
Begin
   wid := 0;
   maxwid := Length(hdr);
   If ack and (Length(ftr) > maxwid) Then
      maxwid := Length(ftr);
   lines := 1;
   { how many rows does this window need ? }
   For i := 1 to Length(msg) Do Begin
      inc(wid);
      { let's be consistant! }
      If msg[i] = #13 Then msg[i] := #10;
      { either a forced line break or we need to word-wrap }
      If (msg[i] = #10) or (wid >= (MaxCols-2)) Then Begin
         inc(lines);
         j := 0;
         If not (msg[i] in [#10,#32]) Then Begin
            { we're in a word, so find the previous space (if any) }
            Repeat
               inc(j);
            Until (j=wid) or ((i-j) <= 0) or (msg[i-j] = #32);
            If ((i-j) > 0) and (msg[i-j] = #32) Then Begin
               wid := wid-j;
               msg[i-j] := #10  { force a line break }
            End Else
               j := 0;
         End;
         If wid > maxwid Then maxwid := wid;
         wid := j; { either 0 or word-wrap remnent }
      End;
   End;
   If wid > maxwid Then maxwid := wid;
   If ack Then acklns := 1 else acklns := 0;
   { make the message window }
   New(mwin,Init(1,1,maxwid+2,lines+acklns+2,matt,true,hatt));
   With mwin^ Do Begin
      PutHeader(hdr,hatt,center);
      Align(center,center);
      If lines = 1 Then
         { one-liners get centered }
         Write(msg:Length(msg)+((maxwid-Length(msg)) div 2))
      Else
         Write(msg);
      Show;
      If ack Then Begin
         cr := nCursor(cOff);
         FWrite(((cols-Length(ftr)) div 2)+1,rows,matt,0,ftr);
{
  The following line can be used in place of the line above to place the
  footer text in the frame instead of with the message body. Make sure to
  keep acklns=0.

         nFWrite(win,((ncols(win)-Length(ftr)) div 2)+1,nrows(win),hatt,0,ftr);
}
         Readkey;
         While Keypressed Do Readkey;
         Hide;
         nCursor(cr);
      End;
   End;
   If ack Then Begin
      Dispose(mwin,Done);
      mwin := nil;
   End;
   nShowMessage := mwin;
End;

{---------------------------------------
  Read a character string from a window
  win - window to extract info from.
    x - starting column.
    y - starting row.
    n - number of characters to read.
 ---------------------------------------}
Function nReadScr(win : pWindow; x,y,n : integer) : shortstring;
Var
   i,idx : integer;
   s : shortstring;
   c : longint;
   { array of AnsiChar/attr values, 4 bytes each, max 256 }
   buf : array[0..1023] of AnsiChar;
   p : pchtype;
Begin
   s := '';
   p := nReadScrStr(win,x,y,n,@buf);
   If p <> nil Then Begin
      idx := 0;
      For i := 1 to n Do Begin
         system.move(buf[idx],c,SizeOf(c));
         s := s + chr(c and A_CHARTEXT);
         inc(idx,SizeOf(c));
      End;
   End;
   nReadScr := s;
End;

{ overload for current window }
Function nReadScr(x,y,n : integer) : shortstring;
Begin
   nReadScr := nReadScr(ActiveWn,x,y,n);
End;

Function nReadScrStr(win : pWindow; x,y,n : integer; buf : pchtype) : pchtype;
Var
   cx,cy : integer;
   mx,my : longint;
Begin
   cx := nWhereX(win);
   cy := nWhereY(win);
   If win <> nil Then Begin
      getmaxyx(win,my,mx);
      If (x in [1..mx]) and (y in [1..my]) Then Begin
         { n is contrained to the right margin, so no need to range check }
         mvwinchnstr(win,y-1,x-1,buf,n);
         nGotoXY(win,cx,cy);
      End;
   End;
   nReadScrStr := buf;
End;

{ overload for current window }
Function nReadScrStr(x,y,n : integer; buf : pchtype) : pchtype;
Begin
   nReadScrStr := nReadScrStr(ActiveWn,x,y,n,buf);
End;

Function nReadScrColor(win : pWindow; x,y : integer) : integer;
Var
   cl,
   fg,bg,
   cx,cy : integer;
   c,cv,
   mx,my : longint;
Begin
   cl := -1;
   cx := nWhereX(win);
   cy := nWhereY(win);
   If win <> nil Then Begin
      getmaxyx(win,my,mx);
      If (x in [1..mx]) and (y in [1..my]) Then Begin
         c := mvwinch(win,y-1,x-1);
         nGotoXY(win,cx,cy);
         cv := PAIR_NUMBER(c and A_COLOR);
         pair_content(cv,@fg,@bg);
         fg := c2ibm(fg);
         bg := c2ibm(bg);
         cv := (c and A_ATTRIBUTES);
         If A_BOLD and cv = A_BOLD Then inc(fg,8);
         cl := (bg*16)+fg;
      End;
   End;
   nReadScrColor := cl;
End;

{ overload for current window }
Function nReadScrColor(x,y : integer) : integer;
Begin
   nReadScrColor := nReadScrColor(ActiveWn,x,y);
End;

{ write a shortstring with attributes, previously saved with nReadScrStr }
Procedure nWriteScrStr(win : pWindow; x,y : integer; s : pchtype);
Begin
   mvwaddchstr(win,y-1,x-1,s);
   If doRefresh Then wrefresh(win);
End;

{ overload for current window }
Procedure nWriteScrStr(x,y : integer; s : pchtype);
Begin
   mvwaddchstr(ActiveWn,y-1,x-1,s);
   If doRefresh Then wrefresh(ActiveWn);
End;

{---------------------------------------
 save a rectangular portion of a window
   x = start column
   y = start row
   c = number of columns
   r = number of rows
 ---------------------------------------}
Procedure nGrabScreen(var p : pnScreenBuf; x,y,c,r : integer; win : pWindow);
Var
   mx,my : longint;
   i,
   cx,cy : integer;
   prb,trb : pnRowBuf;
Begin
   nReleaseScreen(p);
   getmaxyx(win,my,mx);
   If not (x in [1..mx]) or Not (y in [1..my]) Then Begin
      p := nil;
      Exit;
   End;
   cx := nWhereX(win);
   cy := nWhereY(win);
   New(p);
   p^.x := x;
   p^.y := y;
   p^.n := c;
   p^.first := nil;
   trb := nil;
   For i := 0 to r-1 Do Begin
      If (y+i in [1..my]) Then Begin
         New(prb);
         GetMem(prb^.row,c*SizeOf(chtype));
         mvwinchnstr(win,y-1+i,x-1,prb^.row,c);
         If trb <> nil Then trb^.Next := prb;
         prb^.next := nil;
         trb := prb;
         If i = 0 Then p^.First := prb;
      End;
   End;
   nGotoXY(win,cx,cy);
End;

{ overload for current window }
Procedure nGrabScreen(var p : pnScreenBuf; x,y,c,r : integer);
Begin
   nGrabScreen(p,x,y,c,r,ActiveWn);
End;

{ overload for current full window }
Procedure nGrabScreen(var p : pnScreenBuf);
Var
   c,r : longint;
Begin
   getmaxyx(ActiveWn,r,c);
   nGrabScreen(p,1,1,c,r,ActiveWn);
End;

{-----------------------------------------
 restore a window saved with nGrabScreen
   p = pointer to the saved buffer
   x = start restore to this column
   y = start restore to this row
   win = restore to this window
 -----------------------------------------}
Procedure nPopScreen(p : pnScreenBuf; x,y : integer; win : pWindow);
Var
   cx,cy : integer;
   mx,my : longint;
   pb : pnRowBuf;
Begin
   If p = nil Then Exit;
   getmaxyx(win,my,mx);
   If Not (x in [1..mx]) or Not (y in [1..my]) Then Exit;
   dec(x);
   cx := nWhereX(win);
   cy := nWhereY(win);
   pb := p^.First;
   While pb <> nil Do Begin
      If (pb^.row <> nil) and (y in [1..my]) Then
         mvwaddchnstr(win,y-1,x,pb^.row,p^.n);
      inc(y);
      pb := pb^.next;
   End;
   nGotoXY(win,cx,cy);
   If doRefresh Then wrefresh(win);
End;

{ overload for current window, defined position }
Procedure nPopScreen(p : pnScreenBuf; x,y : integer);
Begin
   nPopScreen(p,x,y,ActiveWn);
End;

{ overload for current window, saved position }
Procedure nPopScreen(p : pnScreenBuf);
Begin
   If p = nil Then Exit;
   nPopScreen(p,p^.x,p^.y,ActiveWn);
End;

{ free up the memory used to store a grabbed screen }
Procedure nReleaseScreen(p : pnScreenBuf);
Var
   cur,tmp : pnRowBuf;
Begin
   If p = nil Then Exit;
   If p^.first <> nil Then Begin
      cur := p^.first;
      While cur <> nil Do Begin
         tmp := cur^.next;
         If cur^.row <> nil Then FreeMem(cur^.row,p^.n * SizeOf(chtype));
         Dispose(cur);
         cur := tmp;
      End;
   End;
   Dispose(p);
End;

{============================== tnMenu ====================================}

{ A one-line procedural wrapper }
Procedure nMakeMenu(
    var mnu : tnMenu;
    x,y,
    _w,_r,_c,
    ta,ca,ga,ba,ha : integer;
    hasframe : boolean;
    hdrpos : tnJustify;
    hdrtxt : shortstring);
Begin
   mnu.init(x,y,_w,_r,_c,ta,ca,ga,hasframe,ba);
   If hdrtxt <> '' Then mnu.PutHeader(hdrtxt,ha,hdrpos);
End;

{ And with a menu pointer }
Procedure nMakeMenu(
    var mnu : pnMenu;
    x,y,
    _w,_r,_c,
    ta,ca,ga,ba,ha : integer;
    hasframe : boolean;
    hdrpos : tnJustify;
    hdrtxt : shortstring);
Begin
   New(mnu,init(x,y,_w,_r,_c,ta,ca,ga,hasframe,ba));
   If hdrtxt <> '' Then mnu^.PutHeader(hdrtxt,ha,hdrpos);
End;

Constructor tnMenu.Init(_x,_y,_w,_r,_c,_tc,_cc,_gc : integer;
                         _fr : boolean; _fc : integer);
Begin
   x := _x;
   y := _y;
   wid := _w;
   r := _r;
   c := _c;
   tc := _tc;
   cc := _cc;
   gc := _gc;
   framed := _fr;
   fc := _fc;
   hc := fc;
   iidx := 0;
   mark := '';
   posted := false;
   If wid > MaxCols Then wid := MaxCols;
   InitWin;
   Spin(false);
End;

Destructor tnMenu.Done;
Begin
   UnPost;
   Clear;
   Dispose(win,Done);
End;

Procedure tnMenu.InitWin;
Const
   xhgt : shortint = 0;
Begin
   If framed Then xhgt := 2 Else xhgt := 0;
   New(win,Init(x,y,(x+wid-1),(y+r+xhgt-1),tc,framed,fc));
End;

Procedure tnMenu.Post;
Var
   bx,by,
   mx,my : longint;
   p : PAnsiChar;
   a : array[0..SizeOf(tnS10)-1] of AnsiChar;
Begin
   { could already be posted }
   UnPost;
   { see if the window size has changed (a new longer item added?) }
   getmaxyx(win^.win,my,mx);
   If (wid <> mx) Then Begin
      getbegyx(win^.win,by,bx);
      Dispose(win,Done);
      x := bx+1;
      y := by+1;
      InitWin;
   End;
   { create the new menu }
   pm := new_menu(@pi);
   { only show item text }
   menu_opts_off(pm,O_SHOWDESC);
   { bind the windows }
   set_menu_win(pm,win^.win);
   set_menu_sub(pm,win^.wn);
   { set the rows and columns }
   set_menu_format(pm,r,c);
   { set the colors }
   set_menu_fore(pm,CursesAtts(cc));
   set_menu_back(pm,CursesAtts(tc));
   set_menu_grey(pm,CursesAtts(gc));
   p := StrPCopy(a,mark);
   set_menu_mark(pm,p);
   merr := post_menu(pm);
   posted := (merr = E_OK);
   Spin(loopon);
End;

Procedure tnMenu.UnPost;
Begin
   merr := unpost_menu(pm);
   merr := free_menu(pm);
   pm := nil;
   posted := false;
End;

Procedure tnMenu.Show;
Begin
   If not posted Then Post;
   win^.Show;
End;

{ Start user interaction loop }
Procedure tnMenu.Start;
Const
   select = #13;
   cancel = #27;
Var
   key : AnsiChar;
   i,cnt,
   prev,
   savecurs,
   xkey : integer;
   direction : longint;
Begin
   Show;
   iidx := 0;
   savecurs := nCursor(cOFF);
   Repeat
      prev := iidx;
      win^.Show;
      key := readkey;
      xkey := 0;
      case key of
         #0 : xkey := ord(readkey);
         ^F : xkey := nKeyHome;
         ^L : xkey := nKeyEnd;
         #9,
         ^N : xkey := nKeyDown;
         ^P : xkey := nKeyUp;
         else menu_driver(pm,ord(key));
      end;
      case xkey of
         nKeyHome : menu_driver(pm,REQ_FIRST_ITEM);
         nKeyEnd  : menu_driver(pm,REQ_LAST_ITEM);
         nKeyRight,
         nKeyDown : menu_driver(pm,REQ_NEXT_ITEM);
         nKeyLeft,
         nKeyUp   : menu_driver(pm,REQ_PREV_ITEM);
      end;
      iidx := item_index(current_item(pm)) + 1;
      If (not Selectable(iidx)) and (key <> cancel) Then Begin
         cnt := Count;
         If cnt > 1 Then Begin
            { temporarily enable spinning }
            If not loopon Then
               menu_opts_off(pm,O_NONCYCLIC);
            { which way to another item? }
            If iidx > prev Then
               direction := REQ_NEXT_ITEM
            Else
               direction := REQ_PREV_ITEM;
            Repeat
               menu_driver(pm,direction);
               i := item_index(current_item(pm)) + 1;
            Until Selectable(i) or (i = iidx);
            { reset spin }
            Spin(loopon);
            { keep prev honest }
            iidx := item_index(current_item(pm)) + 1;
         End;
      End;
   Until key in [select,cancel];
   menu_driver(pm,REQ_CLEAR_PATTERN);
   If iidx = ERR Then merr := iidx;
   If key = cancel Then iidx := 0;
   nCursor(savecurs);
End;

Procedure tnMenu.Stop;
Begin
   Hide;
   UnPost;
End;

Procedure tnMenu.Hide;
Begin
   win^.Hide;
End;

Function tnMenu.Wind : pnWindow;
Begin
   Wind := win;
End;

Procedure tnMenu.Align(hpos,vpos : tnJustify);
Begin
   win^.Align(hpos,vpos);
End;

Procedure tnMenu.Move(_x,_y : integer);
Begin
   win^.Move(_x,_y);
End;

Procedure tnMenu.PutHeader(hdr : shortstring; hcolor : integer; hpos : tnJustify);
Begin
   win^.PutHeader(hdr,hcolor,hpos);
End;

Procedure tnMenu.Clear;
Var
   i : integer;
Begin
   UnPost;
   For i := 1 to nMAXMENUITEMS Do ClearItem(i);
End;

{ is this menu item selectable }
Function tnMenu.Selectable(idx : integer) : boolean;
Begin
   Selectable := IsAssigned(idx) and
   ((O_SELECTABLE and item_opts(pi[idx])) = O_SELECTABLE);
End;

Function tnMenu.IsValid(idx : integer) : boolean;
Begin
   IsValid := ((idx >= 1) and (idx <= nMAXMENUITEMS));
End;

Function tnMenu.IsAssigned(idx : integer) : boolean;
Begin
   IsAssigned := IsValid(idx) and (pi[idx] <> nil);
End;

Procedure tnMenu.ClearItem(idx : integer);
Begin
   If IsValid(idx) Then Begin
      If items[idx] <> nil Then Begin
         merr := free_item(pi[idx]);
         If merr = E_OK Then Begin
            FreeMem(items[idx],StrLen(items[idx]^)+1);
            pi[idx] := nil;
            items[idx] := nil;
         End;
      End;
   End Else merr := E_BAD_ARGUMENT;
End;

Procedure tnMenu.AddItem(i : integer; s : shortstring);
Const
   fwid : shortint = 0;
   iwid : shortint = 1;
Var
   rl : integer;
   sp1,sp2,sp3 : plongint;
Begin
   If IsValid(i) Then Begin
      sp1:=nil; sp2:=nil; sp3:=nil;
      ClearItem(i);
      GetMem(items[i],Length(s)+1);
      StrPCopy(items[i]^,s);
      pi[i] := new_item(PAnsiChar(items[i]),nil);
      If pi[i] <> Nil Then Begin
         merr := E_OK;
         { Expand the window width if necessary. Limit to screen width.
           Add possibly 2 for the frame, the item indicator length, and
           the item spacing value. }
         If framed Then fwid := 2;
         if c > 1 Then Begin
            If posted Then Begin
               { need a valid pm }
               menu_spacing(pm,sp1,sp2,sp3);
               iwid := Length(GetMark) + sp3^;
            End Else
               iwid := Length(GetMark) + 1;
         End Else
            iwid := 0;
         { required length }
         rl := ((Length(s)+iwid)*c)+fwid;
         { expand? }
         If rl > wid Then wid := rl;
         If wid > MaxCols Then wid := MaxCols;
      End Else merr := E_REQUEST_DENIED;
   End Else merr := E_BAD_ARGUMENT;
End;

Function tnMenu.Add(s : shortstring) : integer;
Var
   i : integer;
Begin
   i := 0;
   Add := 0;
   Repeat
      inc(i);
   Until (i > nMAXMENUITEMS) or (items[i] = nil);
   AddItem(i,s);
   If merr = E_OK Then Add := i;
End;

Procedure tnMenu.Insert(idx : integer; s : shortstring);
Begin
   If IsValid(idx) Then Begin
      ClearItem(nMAXMENUITEMS);
      If idx < nMAXMENUITEMS Then Begin
         { shift the pointer list up and keep lists syncronized }
         system.Move(pi[idx],pi[idx+1],SizeOf(pnMenuStr)*(nMAXMENUITEMS-idx));
         system.Move(items[idx],items[idx+1],SizeOf(pItem)*(nMAXMENUITEMS-idx));
         pi[idx] := nil;
         items[idx] := nil;
      End;
      AddItem(idx,s);
   End Else merr := E_BAD_ARGUMENT;
End;

Procedure tnMenu.Remove(idx : integer);
Begin
   If IsValid(idx) Then Begin
      ClearItem(idx);
      { shift the pointer list down and keep lists syncronized }
      system.Move(pi[idx+1],pi[idx],SizeOf(pnMenuStr)*(nMAXMENUITEMS-idx));
      system.Move(items[idx+1],items[idx],SizeOf(pItem)*(nMAXMENUITEMS-idx));
      pi[nMAXMENUITEMS] := nil;
      items[nMAXMENUITEMS] := nil;
   End Else merr := E_BAD_ARGUMENT;
End;

Procedure tnMenu.Change(idx : integer; s : shortstring);
Begin
   AddItem(idx,s);
End;

{ toggle a menu item's selectability }
Procedure tnMenu.Active(idx : integer; b : boolean);
Begin
   Case b of
      true : item_opts_on(pi[idx],O_SELECTABLE);
      false : item_opts_off(pi[idx],O_SELECTABLE);
   End;
End;

{ is the item selectable? }
Function tnMenu.IsActive(idx : integer) : boolean;
Begin
   IsActive := Selectable(idx);
End;

{ Toggle item looping. Moves to first/last when bottom/top is reached }
Procedure tnMenu.Spin(b : boolean);
Begin
   loopon := b;
   If posted Then
    Case b of
       true : menu_opts_off(pm,O_NONCYCLIC);
       false : menu_opts_on(pm,O_NONCYCLIC);
    End;
End;

{ return most recent error status }
Function tnMenu.Status : integer;
Begin
   Status := merr;
End;

Function tnMenu.Index : integer;
Begin
   Index := iidx;
End;

Procedure tnMenu.SetIndex(idx : integer);
Begin
   If IsValid(idx) and IsAssigned(idx) and Selectable(idx) Then Begin
      set_current_item(pm,pi[idx]);
      iidx := idx;
   End;
End;

Function tnMenu.Count : integer;
Begin
   Count := item_count(pm);
End;

Function tnMenu.Rows(_r : integer) : integer;
Begin
   Rows := r;
   If _r > 0 Then r := _r;
End;

Function tnMenu.Cols(_c : integer) : integer;
Begin
   Cols := c;
   If _c > 0 Then c := _c;
End;

{ get the item indicator prefix shortstring }
Function tnMenu.GetMark : shortstring;
Begin
   If posted Then
      GetMark := StrPas(menu_mark(pm))
   Else
      GetMark := mark;
End;

{ set the item indicator prefix shortstring }
Procedure tnMenu.SetMark(ms : shortstring);
Begin
   mark := ms;
End;

Procedure tnMenu.Refresh;
Begin
   Post;
   Show;
End;

Procedure tnMenu.SetColor(att : byte);
Begin
   tc := att;
   If posted Then set_menu_back(pm,CursesAtts(tc));
End;

Procedure tnMenu.SetCursorColor(att : byte);
Begin
   cc := att;
   If posted Then set_menu_fore(pm,CursesAtts(cc));
End;

Procedure tnMenu.SetFrameColor(att : byte);
Begin
   fc := att;
   If posted Then Wind^.PutFrame(att);
End;

Procedure tnMenu.SetGrayColor(att : byte);
Begin
   gc := att;
   If posted Then set_menu_grey(pm,CursesAtts(gc));
End;

{----------------------- initialize the unit!------------------------- }
Begin
   FillChar(_chmap,SizeOf(_chmap),0);
   nEC.Init(false,false,false,false,false,'','',15,_chmap);
   { load the color pairs array with color pair indices (0..63) }
   For bg := 0 to 7 Do For fg := 0 to 7 do cp[bg,fg] := (bg*8)+fg;
   { initialize ncurses }
   If StartCurses(ActiveWn) Then Begin
      { save pointer to ncurses stdscr }
      nscreen := ActiveWn;
      { defaults, crtassign, etc. }
      nInit;
      { create the default full screen, non-bordered window object }
      nStdScr.Init(1,1,MaxCols,MaxRows,7,false,0);
      { default read/write to stdscr }
      ActiveWn := nscreen;
   End Else Begin
      CursesFailed;
   End;
End. { of Unit oCrt }