IMPLEMENTATION MODULE InputManager;
(*
 *  REPERTOIRE
 *  Release 1.6
 *  By Charles Bradford and Cole Brecheen
 *  (c) Copyright 1985-1992 PMI
 *  Green Bay, Wisconsin
 *  All rights reserved
 *  (414) 468-6040
 *
 *  $Header:   D:/logfiles/mods/inputman.mov   1.5   10 Mar 1991 15:28:34   coleb  $
 *
 *)



IMPORT BigSets;
IMPORT ErrorManager;
IMPORT ErrorNames;
IMPORT FieldTypes;
IMPORT FrameManager;
IMPORT FramePainter;
IMPORT GenLists;
IMPORT KbdInput;
IMPORT Key;
IMPORT ListUtils;
IMPORT M2Strings;
IMPORT MsgBox2;
IMPORT Numbers;
IMPORT PosUtils;
IMPORT Rectangles;
IMPORT ScrnTypes;
IMPORT ScrnUtl1;
IMPORT StrConv;
IMPORT StrEdit;
IMPORT SYSTEM;
IMPORT UserOps;
IMPORT VWindows;

VAR
  Initialized : BOOLEAN;

  PROCEDURE Init();
    BEGIN
      IF Initialized THEN
        RETURN;
      ELSE
        Initialized := TRUE;
      END;
      BigSets.Init();
      ErrorManager.Init();
      ErrorNames.Init();
      FieldTypes.Init();
      FrameManager.Init();
      FramePainter.Init();
      GenLists.Init();
      KbdInput.Init();
      Key.Init();
      ListUtils.Init();
      M2Strings.Init();
      MsgBox2.Init();
      Numbers.Init();
      PosUtils.Init();
      Rectangles.Init();
      ScrnTypes.Init();
      ScrnUtl1.Init();
      StrConv.Init();
      StrEdit.Init();
      UserOps.Init();
      VWindows.Init();
    END Init;

CONST
  RequiredMessage = "This field must be filled in. Press Return to continue.";

    PROCEDURE GetScrollableArea(TheFrame : ScrnTypes.DisplayFrame;
        VAR ScrollRect : Rectangles.ARectangle);
    (*
        Returns a rectangle with the absolute field coordinates of
        the scrollable area in the frame
    *)
    BEGIN
      ScrnUtl1.GetVisibleArea(TheFrame, ScrollRect);
        (* Gets physical screen coordinates of visible part of frame. *)
      IF TheFrame^.headline > 0 THEN
        IF NOT ScrnUtl1.BoxInFrame(TheFrame) THEN
          INC(ScrollRect.row1, TheFrame^.headline)
        ELSE
          INC(ScrollRect.row1, TheFrame^.headline-1)
        END;
      END;
    END GetScrollableArea;


  PROCEDURE ClosestField( TheFrame: ScrnTypes.DisplayFrame;
      TheField, col, row: CARDINAL; direction: VWindows.Compass ): CARDINAL;

    (*Returns the number of the field closest to TheField in the
      direction specified.  If you pass 0 to col and row, it
      figures out where TheField is automatically.  If you pass 0
      to TheField, it assumes the cursor is presently outside of
      a field, and that col and row indicate where it is.*)

    VAR
      dist, FieldCount, BestGuess, BestDistance,
          ListStart, ListEnd, StartField, OldField: CARDINAL;
      p1, p2, BestPoint: Rectangles.APoint;

    PROCEDURE Candidate( TheFrame: ScrnTypes.DisplayFrame;
        TheField: CARDINAL; VAR Cursor, FieldSpot:
        Rectangles.APoint; direction: VWindows.Compass; VAR dist:
        CARDINAL ): BOOLEAN;
      VAR
        tmpcol, tmprow: CARDINAL;
      BEGIN
        tmpcol := ScrnUtl1.VirtualFieldCol( TheFrame, TheField );
        tmprow := ScrnUtl1.VirtualFieldRow( TheFrame, TheField );
        FieldSpot.col := INTEGER(tmpcol);
        FieldSpot.row := INTEGER(tmprow);

        CASE direction OF
          VWindows.North, VWindows.NE, VWindows.NW:
            IF (tmprow >= CARDINAL(Cursor.row)) THEN
              RETURN FALSE;
            END
        ELSE
        END;
        CASE direction OF
          VWindows.South, VWindows.SE, VWindows.SW:
            IF (tmprow <= CARDINAL(Cursor.row)) THEN
              RETURN FALSE;
            END;
        ELSE
        END;
        CASE direction OF
          VWindows.East, VWindows.SE, VWindows.NE:
            IF (tmpcol <= CARDINAL(Cursor.col)) THEN
              RETURN FALSE;
            END
        ELSE
        END;
        CASE direction OF
          VWindows.West, VWindows.NW, VWindows.SW:
            IF (tmpcol >= CARDINAL(Cursor.col)) THEN
              RETURN FALSE;
            END;
        ELSE
        END;
        dist := Rectangles.Distance( Cursor, p2 );
        RETURN TRUE;
      END Candidate;

    BEGIN (*ClosestField*)
      OldField := TheFrame^.CurrentField;
      IF TheField # 0 THEN
        col := ScrnUtl1.VirtualFieldCol( TheFrame, TheField );
        row := ScrnUtl1.VirtualFieldRow( TheFrame, TheField );
      ELSE
        TheFrame^.CurrentField := 0;
      END;
      p1.col := INTEGER(col);
      p1.row := INTEGER(row);
      BestGuess := 0;
      BestDistance := 65535;

      CASE direction OF
        VWindows.East, VWindows.SW, VWindows.South, VWindows.SE:
          ListEnd := LastInputField(TheFrame);
          FieldCount := NextInputField( TheFrame, 0 );
          BestPoint.col := 32767;
          BestPoint.row := 32767;
          LOOP
            IF TheFrame^.CurrentField = ListEnd THEN
              EXIT
            END;
            IF Candidate( TheFrame, FieldCount, p1, p2, direction, dist ) THEN
              IF (dist < BestDistance) THEN
                BestDistance := dist;
                BestPoint := p2;
                BestGuess := FieldCount;
              END;
              IF (direction = VWindows.South)
                  AND (p2.row > BestPoint.row) THEN
                EXIT
              ELSIF (direction = VWindows.East) AND ((p2.col >
                  BestPoint.col) OR (p2.row > BestPoint.row)) THEN
                EXIT
              END;
            END;
            TheFrame^.CurrentField := FieldCount;
            FieldCount := NextInputField( TheFrame, 0 );
          END;
      ELSE
        ListStart := FirstInputField(TheFrame);
        FieldCount := PrevInputField( TheFrame, 0 );
        BestPoint.col := 0;
        BestPoint.row := 0;
        LOOP
          IF TheFrame^.CurrentField = ListStart THEN
            EXIT
          END;
          IF Candidate( TheFrame, FieldCount, p1, p2, direction, dist ) THEN
            IF (dist < BestDistance) THEN
              BestDistance := dist;
              BestPoint := p2;
              BestGuess := FieldCount;
            END;
            IF (direction = VWindows.North)
                AND (p2.row < BestPoint.row) THEN
              EXIT
            ELSIF (direction = VWindows.West) AND ((p2.col <
                BestPoint.col) OR (p2.row < BestPoint.row)) THEN
              EXIT
            END;
          END;
          TheFrame^.CurrentField := FieldCount;
          FieldCount := PrevInputField( TheFrame, 0 );
        END;
      END;

      TheFrame^.CurrentField := OldField;
        (* Preserve current field *)
      IF BestGuess # 0 THEN
        RETURN BestGuess;
      ELSE
        RETURN TheField;
      END;
    END ClosestField;



  PROCEDURE InSameRow( TheFrame: ScrnTypes.DisplayFrame; Field1, Field2:
      CARDINAL ): BOOLEAN;
    BEGIN
      RETURN (ScrnUtl1.VirtualFieldRow(TheFrame, Field1) =
          ScrnUtl1.VirtualFieldRow(TheFrame, Field2) );
    END InSameRow;


  PROCEDURE InSameCol( TheFrame: ScrnTypes.DisplayFrame; Field1, Field2:
      CARDINAL ): BOOLEAN;
    BEGIN
      RETURN (ScrnUtl1.VirtualFieldCol(TheFrame, Field1) =
          ScrnUtl1.VirtualFieldCol(TheFrame, Field2) );
    END InSameCol;


(*Probably ought to move following two procedures to MakeFrame and
  add Horizontal boolean to FieldRecType.*)

  PROCEDURE InHorizGroup( TheFrame: ScrnTypes.DisplayFrame; TheField:
      CARDINAL ): BOOLEAN;
    BEGIN
      IF ScrnUtl1.FieldType( TheFrame, TheField ) # ScrnTypes.GroupMember THEN
        RETURN FALSE;
      END;
      IF ScrnUtl1.ChoiceNumber( TheFrame, TheField ) <
          ScrnUtl1.NumberOfChoices( TheFrame, TheField ) THEN
        IF (NOT InSameRow( TheFrame, TheField, TheField + 1 )) THEN
          RETURN FALSE;
        END;
      END;
      IF ScrnUtl1.ChoiceNumber( TheFrame, TheField ) > 1 THEN
        IF (NOT InSameRow( TheFrame, TheField, TheField - 1 )) THEN
          RETURN FALSE;
        END;
      END;
      RETURN TRUE;
    END InHorizGroup;

  PROCEDURE InVerticalGroup( TheFrame: ScrnTypes.DisplayFrame; TheField:
      CARDINAL ): BOOLEAN;
    BEGIN
      IF ScrnUtl1.FieldType( TheFrame, TheField ) # ScrnTypes.GroupMember THEN
        RETURN FALSE;
      END;
      IF ScrnUtl1.ChoiceNumber( TheFrame, TheField ) <
          ScrnUtl1.NumberOfChoices( TheFrame, TheField ) THEN
        IF (NOT InSameCol( TheFrame, TheField, TheField + 1 )) THEN
          RETURN FALSE;
        END;
      END;
      IF ScrnUtl1.ChoiceNumber( TheFrame, TheField ) > 1 THEN
        IF (NOT InSameCol( TheFrame, TheField, TheField - 1 )) THEN
          RETURN FALSE;
        END;
      END;
      RETURN TRUE;
    END InVerticalGroup;


  PROCEDURE NextSelection( TheFrame: ScrnTypes.DisplayFrame; TheField:
      CARDINAL ): CARDINAL;
    VAR
      TmpPtr: ScrnTypes.InputFieldPtr;
    BEGIN
      ScrnUtl1.GetFieldPtr( TheFrame, TheField, TmpPtr );
      IF TmpPtr^.GroupID = TmpPtr^.GroupSize THEN
        RETURN ScrnUtl1.FirstMember( TheFrame, TheField );
      ELSE
        RETURN TheField + 1;
      END;
    END NextSelection;


  PROCEDURE PrevSelection( TheFrame: ScrnTypes.DisplayFrame; TheField:
      CARDINAL ): CARDINAL;
    VAR
      TmpPtr: ScrnTypes.InputFieldPtr;
    BEGIN
      ScrnUtl1.GetFieldPtr( TheFrame, TheField, TmpPtr );
      IF TmpPtr^.GroupID = 1 THEN
        RETURN ScrnUtl1.FirstMember( TheFrame, TheField )
            + TmpPtr^.GroupSize - 1;
      ELSE
        RETURN TheField - 1;
      END;
    END PrevSelection;

  PROCEDURE SelectionKeyMatch( TheFrame: ScrnTypes.DisplayFrame; KeyHit:
      CARDINAL; VAR SelectedFieldNum: CARDINAL ): BOOLEAN;
    VAR
      found: BOOLEAN;
      ListEnd, cnt: CARDINAL;
      FieldPtr: ScrnTypes.InputFieldPtr;
    BEGIN
      IF KeyHit = 0 THEN
        (*Jonathan March's 21 Jun 88 fix.*)
        RETURN FALSE;
      END;
      cnt := 0;
      found := FALSE;
      ListEnd := GenLists.ListLength( TheFrame^.FieldList );
      WHILE (NOT found) AND (cnt < ListEnd) DO
        INC( cnt );
        ScrnUtl1.GetFieldPtr( TheFrame, cnt, FieldPtr );
        IF FieldPtr^.typ = ScrnTypes.GotoCode THEN
          found := KbdInput.CAPkey(KeyHit) = KbdInput.CAPkey(FieldPtr^.MenuKey);
        ELSIF FieldPtr^.typ = ScrnTypes.GroupMember THEN
          found := KbdInput.CAPkey(KeyHit) = KbdInput.CAPkey(FieldPtr^.ChoiceKey);
        END;
      END;
      IF found THEN
        SelectedFieldNum := cnt;
      END;
      RETURN found;
    END SelectionKeyMatch;


  PROCEDURE InSameGroup( TheFrame: ScrnTypes.DisplayFrame; Field1, Field2:
      CARDINAL ): BOOLEAN;
    BEGIN
      IF (ScrnUtl1.FieldType(TheFrame, Field1) # ScrnTypes.GroupMember) OR
         (ScrnUtl1.FieldType(TheFrame, Field2) # ScrnTypes.GroupMember) THEN
        RETURN FALSE;
      END;
      RETURN ScrnUtl1.FirstMember( TheFrame, Field1 ) =
          ScrnUtl1.FirstMember( TheFrame, Field2 );
    END InSameGroup;


  PROCEDURE MoveToSelected( VAR TheFrame: ScrnTypes.DisplayFrame; VAR
      TheField: CARDINAL );
    (* Pass this routine any field number that's a GroupMember,
       and it moves TheFrame^.CurrentField to the selected member
       of the group (and also sets TheField to the field number
       of that member).  We assume the caller has sense enough
       not to call this for fields that are not GroupMembers. *)
    VAR
      cnt, FieldNum: CARDINAL;
      TmpPtr: ScrnTypes.InputFieldPtr;
    BEGIN
      FieldNum := ScrnUtl1.FirstMember( TheFrame,
          TheField );
      TheField := FieldNum;
        (*Save the number of the first choice in TheField, in
          case we don't find one that's selected.*)
      cnt := 1;
      LOOP
        ScrnUtl1.GetFieldPtr( TheFrame, FieldNum, TmpPtr );
        IF (cnt = TmpPtr^.GroupSize) OR (TmpPtr^.selected) THEN
          EXIT;
        END;
        INC( FieldNum );
        INC( cnt );
      END;
      IF TmpPtr^.selected THEN
        TheFrame^.CurrentField := FieldNum;
        TheField := FieldNum;
      ELSE
        TheFrame^.CurrentField := TheField;
        ScrnUtl1.GetFieldPtr( TheFrame, TheField, TmpPtr );
          (* 28 Dec 88:  added this to guarantee that we're
             setting the ^.selected field of the first choice
             field rather than the last one.  Fix contributed by
             Ulrik Schmidt. *)
        TmpPtr^.selected := TRUE;
      END;
    END MoveToSelected;


  PROCEDURE RequiredFilled( FrameRec: ScrnTypes.DisplayFrame; VAR FieldNum:
      CARDINAL ): BOOLEAN;
    VAR
      LocalList : GenLists.GenList;
      TmpPtr: ScrnTypes.InputFieldPtr;
      ImagePtr: ScrnTypes.ImageElmtPtr;
      ListEnd : CARDINAL;
    BEGIN
      ListEnd := ScrnUtl1.FieldListTotal( FrameRec );
      FieldNum := 1;
      WHILE FieldNum <= ListEnd DO
        (* look at each required field, until one is not filled *)
        ScrnUtl1.GetFieldPtr( FrameRec, FieldNum, TmpPtr );
        IF (TmpPtr^.typ = ScrnTypes.EditorCode) AND TmpPtr^.req THEN
          (*We've got a required Editor field*)
          IF ScrnUtl1.ListFromEdField( FrameRec,
              FrameRec^.CurrentField, LocalList ) AND
              ListUtils.IsBlankList( LocalList ) THEN
            RETURN FALSE;
          END;
        ELSIF TmpPtr^.req THEN
          ScrnUtl1.GetFieldImagePtr( FrameRec, FieldNum, ImagePtr );
          (* if field is required and not filled, flag it and exit *)
          IF PosUtils.IsBlank( ImagePtr^.text ) THEN
            RETURN FALSE;
          END;
        END;
        INC( FieldNum );
      END;
      FieldNum := 0;
      RETURN TRUE;
    END RequiredFilled;


    PROCEDURE MakeLegalKeys( TheFrame: ScrnTypes.DisplayFrame; VAR
        NewLegalKeys: KbdInput.KeyNumSet );
      (* construct the sets of legal keys for the field types *)
      VAR
        tmpkey, ListEnd, cnt: CARDINAL;
        FieldPtr: ScrnTypes.InputFieldPtr;
      BEGIN
        BigSets.SetUnion( UserOps.ScreenKeySet,
            UserOps.FunctKeySet, NewLegalKeys );
          (*Add the FunctKeySet to the ScreenKeySet.*)
        ListEnd := ScrnUtl1.FieldListTotal( TheFrame );
        IF ListEnd = 0 THEN
          RETURN;
        END;
        FOR cnt := 1 TO ListEnd DO
          ScrnUtl1.GetFieldPtr( TheFrame, cnt, FieldPtr );
          CASE FieldPtr^.typ OF
            ScrnTypes.GotoCode, ScrnTypes.GroupMember:
              IF FieldPtr^.typ = ScrnTypes.GotoCode THEN
                tmpkey := FieldPtr^.MenuKey;
              ELSE
                tmpkey := FieldPtr^.ChoiceKey;
              END;
              IF (tmpkey >= ORD('a')) AND (tmpkey <= ORD('z')) THEN
                (*This stuff gives us case insensitivity in selection
                  characters.*)
                BigSets.InclSet( NewLegalKeys, tmpkey );
                BigSets.InclSet( NewLegalKeys, KbdInput.CAPkey(tmpkey) );
              ELSIF (tmpkey >= ORD('A')) AND (tmpkey <= ORD('Z')) THEN
                BigSets.InclSet( NewLegalKeys, tmpkey );
                BigSets.InclSet( NewLegalKeys, tmpkey + 32 );
              ELSE
                BigSets.InclSet( NewLegalKeys, tmpkey );
              END;
          ELSE
            (* fall through *)
          END;
        END;
      END MakeLegalKeys;


PROCEDURE MovePointerBar( FrameRec: ScrnTypes.DisplayFrame; NewField :
    CARDINAL );
  VAR
    TmpStr : ARRAY [0..80] OF CHAR;
    NewRowsScrolled, NewColsScrolled : CARDINAL;
    FirstFieldCol, FirstFieldRow, LastFieldCol, LastFieldRow : CARDINAL;
    FirstVisibleRow, FirstVisibleCol, LastVisibleRow,
        LastVisibleCol : CARDINAL;
    Vis : Rectangles.ARectangle;

  PROCEDURE ChangeSelection( TheFrame: ScrnTypes.DisplayFrame; NewField:
      CARDINAL );
    VAR
      FieldPtr: ScrnTypes.InputFieldPtr;
    BEGIN
      ScrnUtl1.GetFieldPtr( TheFrame, TheFrame^.CurrentField,
          FieldPtr );
      FieldPtr^.selected := FALSE;
      FramePainter.RedrawField( FrameRec, FrameRec^.CurrentField, FALSE );
        (* Takes the pointer bar off the old field. *)
      FramePainter.RedrawField( TheFrame, NewField, TRUE );
      TheFrame^.CurrentField := NewField;
      ScrnUtl1.GetFieldPtr( TheFrame, TheFrame^.CurrentField,
          FieldPtr );
      FieldPtr^.selected := TRUE;
      IF UserOps.DoPrompting THEN
        GetPromptStr( FrameRec, FrameRec^.CurrentField, TmpStr );
        ShowPrompt( FrameRec, TmpStr );
      END;
    END ChangeSelection;

  BEGIN (* MovePointerBar *)
    IF NewField < FirstInputField(FrameRec) THEN
      NewField := LastInputField(FrameRec);
    ELSIF NewField > LastInputField( FrameRec ) THEN
      NewField := FirstInputField(FrameRec);
    ELSIF (ScrnUtl1.FieldType(FrameRec, NewField) =
        ScrnTypes.DispCode) THEN
      NewField := NextInputField( FrameRec, 0 );
    END;
    IF NewField = FrameRec^.CurrentField THEN
      RETURN;
    ELSIF FrameRec^.CurrentField = 0 THEN
      FrameRec^.CurrentField := FirstInputField(FrameRec);
    ELSIF InSameGroup( FrameRec, FrameRec^.CurrentField,
        NewField) THEN
      ChangeSelection( FrameRec, NewField );
      RETURN;
    ELSE
      FramePainter.RedrawField( FrameRec, FrameRec^.CurrentField, FALSE );
        (* Takes the pointer bar off the old field.  This is
           in the ELSE clause because, if CurrentField is 0,
           we're placing the first pointer bar, and we don't
           need to take it off any other field.*)
    END;
    IF ScrnUtl1.FieldType(FrameRec, NewField) = ScrnTypes.GroupMember THEN
      (* This doesn't actually redraw the new field with the
         pointer bar on it.  It just sets the variables that
         will put us on the right field if we're moving into
         a group from somewhere outside it; notice that we RETURN
         above if we're moving inside the same group. *)
      MoveToSelected( FrameRec, NewField );
    END;

    FrameRec^.CurrentField := NewField;
      (* Now we've lost track of what the old field was. *)

    (* Check and see if scrolling is needed *)
    IF NOT ScrnUtl1.EntirelyVisible(FrameRec, NewField) THEN
      GetScrollableArea(FrameRec, Vis);

      FirstVisibleRow := CARDINAL(Vis.row1) + FrameRec^.RowsScrolled
          - FrameRec^.startrow;
      LastVisibleRow := CARDINAL(Vis.row2) + FrameRec^.RowsScrolled
          - FrameRec^.startrow;
      FirstVisibleCol := CARDINAL(Vis.col1) + FrameRec^.ColsScrolled
          - FrameRec^.startcol;
      LastVisibleCol := CARDINAL(Vis.col2) + FrameRec^.ColsScrolled
          - FrameRec^.startcol;

      FirstFieldRow := ScrnUtl1.VirtualFieldRow(FrameRec, NewField);
      FirstFieldCol := ScrnUtl1.VirtualFieldCol(FrameRec, NewField);
      LastFieldRow := FirstFieldRow +
          ScrnUtl1.FieldHeight(FrameRec, NewField) - 1;
      LastFieldCol := FirstFieldCol +
          ScrnUtl1.FieldWidth(FrameRec, NewField) - 1;
        (* Default to no scrolling *)
      NewRowsScrolled := FrameRec^.RowsScrolled;
      NewColsScrolled := FrameRec^.ColsScrolled;
        (* Vertical *)
      IF FirstFieldRow < FirstVisibleRow THEN
        IF ScrnUtl1.InputFieldsAbove(FrameRec, NewField) THEN
          DEC(NewRowsScrolled, FirstVisibleRow-FirstFieldRow);
        ELSE
          (* Make sure any text above first input field is
             visible. *)
          NewRowsScrolled := 0;
        END (* if *);
      ELSIF LastFieldRow > LastVisibleRow THEN
        IF ScrnUtl1.InputFieldsBelow(FrameRec, NewField) THEN
          INC(NewRowsScrolled, LastFieldRow-LastVisibleRow);
        ELSE
          (* Scroll to bottom of frame *)
          INC(NewRowsScrolled, ScrnUtl1.PartOutside(FrameRec, Vis,
              VWindows.South));
        END;
      END (* if *);
      (* Horizontal *)
      IF FirstFieldCol < FirstVisibleCol THEN
        IF ScrnUtl1.InputFieldsToLeft(FrameRec, NewField) THEN
          DEC(NewColsScrolled, FirstVisibleCol-FirstFieldCol);
        ELSE
          NewColsScrolled := 0;
        END;
      ELSIF LastFieldCol > LastVisibleCol THEN
        IF ScrnUtl1.InputFieldsToRight(FrameRec, NewField) THEN
          INC(NewColsScrolled, LastFieldCol-LastVisibleCol);
        ELSE
          INC(NewColsScrolled, ScrnUtl1.PartOutside(FrameRec, Vis,
              VWindows.East));
        END;
      END (* if *);
      SlideFrame(FrameRec, FrameRec^.ColsScrolled, NewColsScrolled,
          FrameRec^.RowsScrolled, NewRowsScrolled);
    END (* if not entirely visible *);

    IF ScrnUtl1.FieldType(FrameRec, NewField) # ScrnTypes.EditorCode THEN
      FramePainter.RedrawField(FrameRec, NewField, TRUE);
        (* Hightlight field *)
    END;
    IF UserOps.DoPrompting THEN
      GetPromptStr( FrameRec, FrameRec^.CurrentField, TmpStr );
      ShowPrompt( FrameRec, TmpStr );
    END;
  END MovePointerBar;


PROCEDURE PageDown(TheFrame : ScrnTypes.DisplayFrame);
(*
    Move to the field nearest to one scroll height below
    the current one.
*)
  VAR
    Vis : Rectangles.ARectangle;
    NewField, ScrollHeight, NewRow, NewCol, Distance : CARDINAL;
  BEGIN
    IF ScrnUtl1.EntirelyVisible( TheFrame, LastInputField(TheFrame) ) THEN
      MovePointerBar( TheFrame, LastInputField(TheFrame) );
      RETURN;
    END;
    (*
        The next field isn't currently visible, need to
        repaint the entire frame
    *)
    GetScrollableArea(TheFrame, Vis);
    ScrollHeight := CARDINAL(Vis.row2-Vis.row1)+1;
    NewRow := ScrnUtl1.VirtualFieldRow(TheFrame, TheFrame^.CurrentField)
        + ScrollHeight;
    NewCol := ScrnUtl1.VirtualFieldCol(TheFrame, TheFrame^.CurrentField);
    NewField := ClosestField(TheFrame, 0, NewCol, NewRow+1,
        VWindows.North);
    MovePointerBar( TheFrame, NewField );
  END PageDown;


PROCEDURE PageUp(TheFrame : ScrnTypes.DisplayFrame);
  (*
      Move to the field nearest to one scroll height above
      the current one.
  *)
  VAR
    Vis : Rectangles.ARectangle;
    NewField, vrow, ScrollHeight, NewRow, NewCol: CARDINAL;
  BEGIN
    GetScrollableArea(TheFrame, Vis);
    ScrollHeight := CARDINAL(Vis.row2-Vis.row1)+1;
    IF TheFrame^.RowsScrolled = 0 THEN
      MovePointerBar( TheFrame, FirstInputField(TheFrame) );
    ELSE
      vrow := ScrnUtl1.VirtualFieldRow(TheFrame, TheFrame^.CurrentField);
      NewRow := Numbers.IntMax( 1, INTEGER(vrow) - INTEGER(ScrollHeight) );
      NewCol := ScrnUtl1.VirtualFieldCol(TheFrame, TheFrame^.CurrentField);
      NewField := ClosestField(TheFrame, 0, NewCol, NewRow-1,
          VWindows.South);
      MovePointerBar( TheFrame, NewField );
    END;
  END PageUp;


(*================== Exported Procedures ========================*)

  PROCEDURE FirstInputField(FrameRec : ScrnTypes.DisplayFrame) : CARDINAL;
  VAR
      LastField, NewField : CARDINAL;
  BEGIN
    LastField := ScrnUtl1.FieldListTotal(FrameRec);
    NewField := 1;
    WHILE (ScrnUtl1.FieldType(FrameRec, NewField) = ScrnTypes.DispCode) DO
      IF NewField < LastField THEN
        INC(NewField);
      ELSE
        RETURN 1;
      END;
    END (* while *);
    RETURN NewField;
  END FirstInputField;

  PROCEDURE LastInputField(FrameRec : ScrnTypes.DisplayFrame) : CARDINAL;
  VAR
    NewField : CARDINAL;
  BEGIN
    NewField := ScrnUtl1.FieldListTotal(FrameRec);
    WHILE (ScrnUtl1.FieldType(FrameRec, NewField) = ScrnTypes.DispCode) DO
      IF NewField > 1 THEN
        DEC(NewField);
      ELSE
        RETURN ScrnUtl1.FieldListTotal(FrameRec);
      END (* if *);
    END (* while *);
    RETURN NewField;
  END LastInputField;

  PROCEDURE NextInputField( FrameRec : ScrnTypes.DisplayFrame;
      skip: CARDINAL ): CARDINAL;
  VAR
    LastField, NewField : CARDINAL;
  BEGIN
    LastField := ScrnUtl1.FieldListTotal(FrameRec);
    IF FrameRec^.CurrentField < (LastField - skip) THEN
      NewField := FrameRec^.CurrentField + skip + 1;
    ELSE
      NewField := 1;
    END;
    WHILE (ScrnUtl1.FieldType(FrameRec, NewField) = ScrnTypes.DispCode)
      AND (NewField # FrameRec^.CurrentField) DO
      IF NewField < LastField THEN
        INC(NewField);
      ELSE
        NewField := 1;
      END;
    END (* while *);
    RETURN NewField;
  END NextInputField;

  PROCEDURE PrevInputField( VAR FrameRec : ScrnTypes.DisplayFrame;
      skip: CARDINAL ) : CARDINAL;
  VAR
    NewField : CARDINAL;
  BEGIN
    IF (FrameRec^.CurrentField + skip) > 1 THEN
      NewField := (FrameRec^.CurrentField - skip) - 1;
    ELSE
      NewField := ScrnUtl1.FieldListTotal(FrameRec);
    END;
    WHILE (ScrnUtl1.FieldType(FrameRec, NewField) = ScrnTypes.DispCode)
        AND (NewField # FrameRec^.CurrentField) DO
      IF NewField > 1 THEN
        DEC(NewField);
      ELSE
        NewField := ScrnUtl1.FieldListTotal(FrameRec);
      END;
    END (* while *);
    RETURN NewField;
  END PrevInputField;


  PROCEDURE HiLiteSelChars( TheFrame: ScrnTypes.DisplayFrame );
    VAR
      FieldListEnd, cnt: CARDINAL;
      TmpType : CHAR;
    BEGIN
      FieldListEnd := ScrnUtl1.FieldListTotal( TheFrame );
      FOR cnt := 1 TO FieldListEnd DO
        TmpType := ScrnUtl1.FieldType( TheFrame, cnt );
        IF (TmpType = ScrnTypes.GotoCode) OR
            (TmpType = ScrnTypes.GroupMember) THEN
          IF ScrnUtl1.EntirelyVisible( TheFrame, cnt ) THEN
            FramePainter.RedrawField( TheFrame, cnt, FALSE );
          END;
        END;
      END;
    END HiLiteSelChars;


  PROCEDURE LookAlive( TheFrame: ScrnTypes.DisplayFrame );
    VAR
      TmpStr: ARRAY [0..127] OF CHAR;
      fldtype : CHAR;
    BEGIN
      IF TheFrame^.action <= 'Z' THEN
        (* We are temporarily lowercasing the .action character
           to tell us whether the frame is under the control of
           ControlFrame.  We use this to disable LookAlive when
           it is called in places where it probably shouldn't be.
           Not good. *)
        RETURN;
      END;
      HiLiteSelChars( TheFrame );
      IF (TheFrame^.CurrentField > 0) AND
          (TheFrame^.CurrentField <= ScrnUtl1.FieldListTotal(TheFrame)) THEN
        IF UserOps.DoPrompting THEN
          GetPromptStr( TheFrame, TheFrame^.CurrentField, TmpStr );
          ShowPrompt( TheFrame, TmpStr );
        END;
        fldtype := ScrnUtl1.FieldType( TheFrame, TheFrame^.CurrentField );
        IF ScrnUtl1.EntirelyVisible( TheFrame, TheFrame^.CurrentField ) THEN
          FramePainter.RedrawField( TheFrame, TheFrame^.CurrentField, TRUE );
          IF (fldtype # ScrnTypes.GotoCode) AND (fldtype #
              ScrnTypes.GroupMember) AND (fldtype #
              ScrnTypes.DispCode) THEN
            VWindows.SetCursorHeight( VWindows.CurrentWindow, 2 );
          END;
        END;
      END;
    END LookAlive;


  PROCEDURE ReconstructFrame( TheFrame: ScrnTypes.DisplayFrame );
    VAR
      TmpStr: ARRAY [0..127] OF CHAR;
    BEGIN
      FramePainter.ShowDisplayFrame( TheFrame, 0, 0, 0, 0 );
      LookAlive( TheFrame );
    END ReconstructFrame;


  PROCEDURE ShowPrompt( FrameRec: ScrnTypes.DisplayFrame;
      str : ARRAY OF CHAR );
    (*Display the prompt centered within the prompt line
      specified in UserOps.*)
    VAR
      tmp: ARRAY [0..127] OF CHAR;
        (*We use tmp because the caller may not have left enough
          room in str to pad it with blanks.*)
    BEGIN
      ScrnUtl1.SetPromptColors( FrameRec );
      M2Strings.Assign( str, tmp );
      StrEdit.Center( tmp, UserOps.PromptLength );

      VWindows.DrawStr( FrameRec^.WindowHandle, UserOps.PromptCol,
          UserOps.PromptRow, SYSTEM.ADR(tmp),
          UserOps.PromptLength );
    END ShowPrompt;


  PROCEDURE GetPromptStr( TheFrame: ScrnTypes.DisplayFrame; TheField:
      CARDINAL; VAR TheStr: ARRAY OF CHAR );
    VAR
      FieldRec: ScrnTypes.InputFieldRecord;
      TypeCode: CARDINAL;
      MaxStr, MinStr: ARRAY [0..31] OF CHAR;
    BEGIN
      ScrnUtl1.GetFieldRec( TheFrame, TheField, FieldRec );
      IF FieldRec.PromptNum # 0 THEN
        GenLists.GetElmt( TheFrame^.PromptList, FieldRec.PromptNum,
            TheStr, TypeCode );
      ELSE
        FieldTypes.GetDefaultPrompt( FieldRec.typ, TheStr );
        CASE FieldRec.typ OF
          ScrnTypes.IntCode :
            StrConv.LongIntegerToStr( FieldRec.iMax, 1, MaxStr );
            StrConv.LongIntegerToStr( FieldRec.iMin, 1, MinStr);
        | ScrnTypes.RealCode :
            StrConv.RealToStr( FieldRec.rMax, 1, 0, MaxStr );
            StrConv.RealToStr( FieldRec.rMin, 1, 0, MinStr);
        ELSE
          RETURN;
        END;
        StrEdit.ReplaceStr( 'MAX', MaxStr, TheStr );
        StrEdit.ReplaceStr( 'MIN', MinStr, TheStr );
      END;
    END GetPromptStr;


    PROCEDURE SlideFrame( FrameRec: ScrnTypes.DisplayFrame;
        OldColsScrolled, NewColsScrolled, OldRowsScrolled,
        NewRowsScrolled: CARDINAL );
      VAR
        Vis: Rectangles.ARectangle;
        vdist, ScrollableHeight : INTEGER;
      BEGIN
        FrameRec^.ColsScrolled := NewColsScrolled;
        FrameRec^.RowsScrolled := NewRowsScrolled;
        vdist := INTEGER(NewRowsScrolled) - INTEGER(OldRowsScrolled);
        IF (vdist = 0) AND (NewColsScrolled = OldColsScrolled) THEN
          RETURN;
        END;
        ScrnUtl1.SetNormalColors( FrameRec );
        GetScrollableArea( FrameRec, Vis );
        WITH Vis DO
          IF NewColsScrolled # OldColsScrolled THEN
            (*We repaint the whole window if we're going to have to
              scroll horizontally.*)
            VWindows.ClearPart( FrameRec^.WindowHandle, col1,
                row1, col2, row2 );
            FramePainter.RedrawArea( FrameRec, CARDINAL(col1),
                CARDINAL(row1), CARDINAL(col2), CARDINAL(row2) );
            RETURN;
          END;
          ScrollableHeight := CARDINAL(row2) - CARDINAL(row1) + 1;
          IF ABS(vdist) > ScrollableHeight THEN
            IF vdist > 0 THEN
              vdist := ScrollableHeight;
            ELSE
              vdist := -ScrollableHeight;
            END;
          END;
          IF NOT VWindows.ScrollVertically(FrameRec^.WindowHandle,
              col1, row1, col2, row2, vdist ) THEN
            (*tough luck if the window manager doesn't support scrolling*)
          END;
          IF vdist > 0 THEN
            (*Redraw the area at the bottom because we scrolled up.*)
            FramePainter.RedrawArea( FrameRec, CARDINAL(col1),
                (CARDINAL(row2) - CARDINAL(ABS(vdist))) + 1,
                CARDINAL(col2), CARDINAL(row2) );
          ELSE
              (*Redraw the area at the top because we scrolled down.*)
            FramePainter.RedrawArea( FrameRec, CARDINAL(col1),
                CARDINAL(row1),CARDINAL(col2),CARDINAL(row1+ABS(vdist)-1));
          END (* if *);
        END (* with Vis *);
      END SlideFrame;


  PROCEDURE ControlFrame(VAR FrameRec : ScrnTypes.DisplayFrame;
        LandingField : CARDINAL; message : ARRAY OF CHAR;
        RedrawFirst : BOOLEAN; VAR NextFrame: ScrnTypes.AFrameName );
    VAR
      MaxChoices, SavedFieldNum: CARDINAL;
      ReturnValue, FrameAbove, FrameBelow, FrameLeft,
          FrameRight : ScrnTypes.AFrameName;
      LastKey : CARDINAL;
      AbsFldCol, AbsFldRow: INTEGER;
      LocalMessage : ARRAY [0..79] OF CHAR;
      TmpScreenKeys: KbdInput.KeyNumSet;
      FieldRec: ScrnTypes.InputFieldRecord;


  PROCEDURE HitAnyKey( VAR NextFrame: ScrnTypes.AFrameName );
    (* prompt for any key to be hit and exit, returning
       either normal next or TheKeyHandler result (keep
       asking for input if user asks for help or time) *)
    VAR
      key : CARDINAL;
      tryagain : BOOLEAN;
    BEGIN
      IF UserOps.DoPrompting THEN
        ShowPrompt( FrameRec, 'Press Any Key To Continue.' );
      END;
      REPEAT
        key := KbdInput.KeyHit( KbdInput.AnyKeyNum );
        IF BigSets.InSet( UserOps.FunctKeySet, key ) THEN
          (* if in special key set, execute user program *)
          SavedFieldNum := FrameRec^.CurrentField;
          UserOps.TheKeyHandler( FrameRec, key, NextFrame );
          ScrnUtl1.SetCurrentField( FrameRec, SavedFieldNum );
          tryagain := PosUtils.Equal( NextFrame, ScrnTypes.ContinueInput );
        ELSE
          (* they hit a key not in the special key set, so
             return *)
          M2Strings.Assign( FrameRec^.normlnext, NextFrame );
          tryagain := FALSE;
        END;
      UNTIL NOT tryagain;
    END HitAnyKey;


    PROCEDURE ShowBadType( FrameRec: ScrnTypes.DisplayFrame );
      VAR
        ImageRec: ScrnTypes.ImageElement;
        dumstr: ARRAY [0..79] OF CHAR;
      BEGIN
        ScrnUtl1.GetFieldImageRec( FrameRec, FrameRec^.CurrentField,
            ImageRec );
        M2Strings.Concat("Bad type in ControlFrame. Text = ", ImageRec.text,
            dumstr );
        ErrorManager.WARN( dumstr );
      END ShowBadType;


  PROCEDURE NormalKeyResponse( VAR FrameRec:
      ScrnTypes.DisplayFrame; VAR TheFieldRec:
      ScrnTypes.InputFieldRecord; VAR LastKey: CARDINAL; VAR
      ReturnValue: ScrnTypes.AFrameName );
    VAR
      NewField: CARDINAL;
    BEGIN
      NewField := FrameRec^.CurrentField;
        (*Just in case we don't need to move it.*)
      IF LastKey = Key.Down THEN
        IF InVerticalGroup( FrameRec, FrameRec^.CurrentField ) THEN
          NewField := NextSelection( FrameRec, FrameRec^.CurrentField );
        ELSIF NOT ScrnUtl1.InputFieldsBelow( FrameRec,
            FrameRec^.CurrentField ) THEN
          IF FrameBelow[0] # 0C THEN
            M2Strings.Assign( FrameBelow, ReturnValue );
          ELSE
            NewField := FirstInputField(FrameRec);
          END;
        ELSE
          NewField := ClosestField( FrameRec,
              FrameRec^.CurrentField, 0, 0, VWindows.South );
        END;
        MovePointerBar( FrameRec, NewField );
      ELSIF LastKey = Key.Up THEN
        IF InVerticalGroup( FrameRec, FrameRec^.CurrentField ) THEN
          NewField := PrevSelection( FrameRec, FrameRec^.CurrentField );
        ELSIF NOT ScrnUtl1.InputFieldsAbove( FrameRec,
            FrameRec^.CurrentField ) THEN
          IF FrameAbove[0] # 0C THEN
            M2Strings.Assign( FrameAbove, ReturnValue );
          ELSE
            NewField := LastInputField( FrameRec );
          END;
        ELSE
          NewField := ClosestField( FrameRec,
              FrameRec^.CurrentField, 0, 0, VWindows.North );
        END;
        MovePointerBar( FrameRec, NewField );
      (* RST Change *)
      ELSIF LastKey = Key.CtrlPgUp THEN
        MovePointerBar( FrameRec, FirstInputField(FrameRec));
      ELSIF LastKey = Key.CtrlPgDn THEN
        MovePointerBar( FrameRec, LastInputField(FrameRec));
      ELSIF LastKey = Key.PgUp THEN
        PageUp(FrameRec);
      ELSIF LastKey = Key.PgDn THEN
        PageDown(FrameRec);
      ELSIF LastKey = Key.Right THEN
        IF InHorizGroup( FrameRec, FrameRec^.CurrentField ) THEN
          NewField := NextSelection( FrameRec, FrameRec^.CurrentField );
        ELSIF (NOT ScrnUtl1.InputFieldsToRight( FrameRec,
            FrameRec^.CurrentField )) AND (FrameRight[0] # 0C) THEN
          M2Strings.Assign( FrameRight, ReturnValue );
        ELSE
          NewField := NextInputField( FrameRec, 0 );
        END;
        MovePointerBar( FrameRec, NewField );
      ELSIF LastKey = Key.Left THEN
        IF InHorizGroup( FrameRec, FrameRec^.CurrentField ) THEN
          NewField := PrevSelection( FrameRec, FrameRec^.CurrentField );
        ELSIF (NOT ScrnUtl1.InputFieldsToLeft( FrameRec,
            FrameRec^.CurrentField )) AND (FrameLeft[0] # 0C) THEN
          M2Strings.Assign( FrameLeft, ReturnValue );
        ELSE
          NewField := PrevInputField( FrameRec, 0 );
        END;
        MovePointerBar( FrameRec, NewField );
      ELSIF LastKey = Key.Tab THEN
        MovePointerBar( FrameRec, NextInputField( FrameRec, 0 ));
      ELSIF LastKey = Key.BackTab THEN
        MovePointerBar( FrameRec, PrevInputField( FrameRec, 0 ));
      ELSIF LastKey = Key.Return THEN
        IF TheFieldRec.typ = ScrnTypes.GotoCode THEN
          (* force jump *)
          M2Strings.Assign( TheFieldRec.ReturnVal, ReturnValue );
        ELSIF (TheFieldRec.typ = ScrnTypes.GroupMember) THEN
          IF (MaxChoices = 1) THEN
              (* There are no other fields in the frame except
                 this group.  We know we have to leave, but first
                 we have to choose a return value (for
                 compatibility with 1.4.) *)
            IF M2Strings.Length(TheFieldRec.fnam) > 0 THEN
              (*This lets you store the return value in the
                field name of the choice. *)
              M2Strings.Assign( TheFieldRec.fnam, ReturnValue );
            ELSE
              M2Strings.Assign( FrameRec^.normlnext, ReturnValue );
            END;
          ELSE
            (* There are fields outside this group. Move to the
               first one following it.*)
            NewField := NextInputField( FrameRec, (TheFieldRec.GroupSize -
               TheFieldRec.GroupID) );
            MovePointerBar( FrameRec, NewField );
          END;
        ELSIF MaxChoices#1 THEN
          MovePointerBar( FrameRec, NextInputField( FrameRec, 0 ) );
        ELSE
          M2Strings.Assign( FrameRec^.normlnext, ReturnValue);
            (* only one field, and it's an input field; leave.*)
        END;
      ELSIF SelectionKeyMatch( FrameRec, LastKey, NewField ) THEN
        MovePointerBar( FrameRec, NewField );
        ScrnUtl1.GetFieldRec( FrameRec, NewField, TheFieldRec );
        IF (ScrnUtl1.AllFieldsThisType(FrameRec, ScrnTypes.GotoCode)) THEN
          (* If the user presses the selection character of a menu item
             and the frame contains a mixture of field types, we move the
             pointer bar to the goto field, but we don't submit the frame, as
             we do if the frame contains only goto fields.  If you want to
             submit the frame in that case, change this IF to
             something like 'IF TheFieldRec.typ = ScrnTypes.GotoCode' *)
          M2Strings.Assign( TheFieldRec.ReturnVal, ReturnValue );
        END;
        IF (ScrnUtl1.AllFieldsThisType(FrameRec, ScrnTypes.GroupMember)) THEN
          M2Strings.Assign( TheFieldRec.fnam, ReturnValue );
        END;
      END;
    END NormalKeyResponse;


  PROCEDURE NoFieldsKeyResponse( VAR FrameRec: ScrnTypes.DisplayFrame;
      VAR LastKey: CARDINAL; VAR ReturnValue: ScrnTypes.AFrameName );
    VAR
      VisibleArea: Rectangles.ARectangle;
      nOutside, oldcs, oldrs, WindowHeight: CARDINAL;
    BEGIN
      ScrnUtl1.GetVisibleArea( FrameRec, VisibleArea );
      WindowHeight := VisibleArea.row2 - VisibleArea.row1 + 1;
      oldcs := FrameRec^.ColsScrolled;
      oldrs := FrameRec^.RowsScrolled;
      StrEdit.AssignStr( ScrnTypes.ContinueInput, ReturnValue );
      IF LastKey = Key.Down THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.South ) > 0 THEN
          INC( FrameRec^.RowsScrolled );
        END;
      ELSIF LastKey = Key.Up THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.North ) > 0 THEN
          DEC( FrameRec^.RowsScrolled );
        END;
      ELSIF LastKey = Key.PgUp THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.North ) > WindowHeight THEN
          DEC( FrameRec^.RowsScrolled, WindowHeight );
        ELSE
          FrameRec^.RowsScrolled := 0;
        END;
      ELSIF LastKey = Key.PgDn THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.South ) > WindowHeight THEN
          INC( FrameRec^.RowsScrolled, WindowHeight );
        ELSIF FrameRec^.VirtualHeight > WindowHeight THEN
          FrameRec^.RowsScrolled := FrameRec^.VirtualHeight - WindowHeight;
        ELSE
          FrameRec^.RowsScrolled := 0;
        END;
      ELSIF LastKey = Key.Right THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.East ) > 0 THEN
          INC( FrameRec^.ColsScrolled );
        END;
      ELSIF LastKey = Key.Left THEN
        IF ScrnUtl1.PartOutside( FrameRec, VisibleArea,
            VWindows.West ) > 0 THEN
          DEC( FrameRec^.ColsScrolled );
        END;
      ELSIF LastKey = Key.Tab THEN
        nOutside := ScrnUtl1.PartOutside( FrameRec, VisibleArea, VWindows.East);
        IF nOutside > 8 THEN
          INC( FrameRec^.ColsScrolled, 8 );
        ELSIF nOutside > 0 THEN
          INC( FrameRec^.ColsScrolled, nOutside);
        END;
      ELSIF LastKey = Key.BackTab THEN
        nOutside := ScrnUtl1.PartOutside( FrameRec, VisibleArea,VWindows.West);
        IF nOutside > 8 THEN
          DEC( FrameRec^.ColsScrolled, 8 );
        ELSIF nOutside > 0 THEN
          DEC( FrameRec^.ColsScrolled, nOutside);
        END;
      ELSIF LastKey = Key.Return THEN
        M2Strings.Assign( FrameRec^.normlnext, ReturnValue);
        RETURN;
      END;
      SlideFrame( FrameRec, oldcs, FrameRec^.ColsScrolled,
          oldrs, FrameRec^.RowsScrolled );
    END NoFieldsKeyResponse;


  PROCEDURE RepaintVisibleArea();
    VAR
      FirstVisibleRow, FirstVisibleCol, LastVisibleRow,
          LastVisibleCol : CARDINAL;
      Vis : Rectangles.ARectangle;
    BEGIN
      ScrnUtl1.GetVisibleArea(FrameRec, Vis);
      WITH Vis DO
        FirstVisibleRow := CARDINAL(row1);
        LastVisibleRow := CARDINAL(row2);
        FirstVisibleCol := CARDINAL(col1);
        LastVisibleCol := CARDINAL(col2);
          (* 11 Oct 88:  removed +RowsScrolled from each of
             these lines at suggestion of Karta Khalsa and
             Ulrik Schmidt. *)
      END;
      FramePainter.RedrawArea( FrameRec, FirstVisibleCol, FirstVisibleRow,
          LastVisibleCol, LastVisibleRow);
    END RepaintVisibleArea;

    BEGIN
      (*ControlFrame*)

      VWindows.SetCursorHeight( FrameRec^.WindowHandle, 0 );
      M2Strings.Assign(message, LocalMessage);
      IF RedrawFirst THEN
        RepaintVisibleArea();
      END;

      MaxChoices := ScrnUtl1.FieldGroupTotal( FrameRec );
        (* Number of choices or fields in the frame, counting each
           group of choice fields as a single choice. *)
      M2Strings.Assign( FrameRec^.normlnext, NextFrame );
      MakeLegalKeys( FrameRec, TmpScreenKeys );
      StrEdit.LowerStr( FrameRec^.action );
        (* Added 13 Nov 88.  We lowercase the action char while
           the frame is active and restore it to uppercase when it is
           not so that we have a temporary way of determining
           whether the frame is active.  Don't rely on this.  In
           a future release we will add a boolean to the DisplayFrame
           record and quit using this kludge. *)
      IF CAP(FrameRec^.action) = ScrnTypes.DispCode THEN
        (* Do not process user input.  Note that we don't call
           EraseFrame if the frame is both DisplayOnly and
           ClearAfter, since this combination really doesn't make
           sense -- latter is probably programmer's mistake. *)
        RETURN;
      END;
      IF FrameRec^.EntryBox[0] # 0C THEN
        (*Now we change the appearance of the border to let the
          user know the frame is active.*)
        ScrnUtl1.BoxFrame( FrameRec, TRUE );
      END;
      IF (CAP(FrameRec^.action) = 'W') THEN
        (* wait for any user input, then exit *)
        HitAnyKey( NextFrame );
        IF FrameRec^.ExitBox[0] # 0C THEN
          (*Now we change the appearance of the border to let the
            user know the frame is no longer active.*)
          ScrnUtl1.BoxFrame( FrameRec, FALSE );
        END;
        IF FrameRec^.ClearAfter THEN
          FrameManager.EraseFrame( FrameRec );
        END;
        RETURN;
      END;
      HiLiteSelChars( FrameRec );
      StrEdit.SetLength( ReturnValue, 0 );
      ScrnUtl1.GetFrameLinks( FrameRec, FrameAbove, FrameBelow, FrameLeft,
          FrameRight );
      FrameRec^.CurrentField := 0;
        (*Prevent MovePointerBar from exiting if CurrentField
          happens to equal LandingField.*)
      IF (LandingField=0) AND (MaxChoices > 0) THEN
        MovePointerBar( FrameRec, FirstInputField(FrameRec));
        (*highlights first choice*)
      END;

      REPEAT
        IF (LandingField # 0) AND (MaxChoices > 0) THEN
          (* LandingField is not 0, so highlight the specified
             field.  We do this at the top of each loop so that
             ControlFrame can signal errors from within the loop. *)
          MovePointerBar( FrameRec, LandingField );
          LandingField := 0;
        END;
        IF M2Strings.Length( LocalMessage ) > 0 THEN
          MsgBox2.StrMsgBox( FrameRec, VWindows.SE, LocalMessage );
          StrEdit.SetLength( LocalMessage, 0 );
        END;

        IF (MaxChoices = 0) OR
            (ScrnUtl1.AllFieldsThisType(FrameRec, ScrnTypes.DispCode)) THEN
          LastKey := KbdInput.KeyHit( TmpScreenKeys );
          UserOps.TheKeyHandler( FrameRec, LastKey, ReturnValue );
          IF PosUtils.Equal( ReturnValue, ScrnTypes.ContinueInput ) THEN
            NoFieldsKeyResponse( FrameRec, LastKey, ReturnValue );
          END;
        ELSE
          ScrnUtl1.GetFieldRec( FrameRec, FrameRec^.CurrentField, FieldRec );
          SavedFieldNum := FrameRec^.CurrentField;
          CASE FieldRec.typ OF
            ScrnTypes.GotoCode, ScrnTypes.GroupMember :
            LastKey := KbdInput.KeyHit( TmpScreenKeys );
            UserOps.TheKeyHandler( FrameRec, LastKey, ReturnValue );
          ELSE
            AbsFldRow := ScrnUtl1.AbsFieldRow(FrameRec,
            FrameRec^.CurrentField);
            AbsFldCol := ScrnUtl1.AbsFieldCol(FrameRec,
            FrameRec^.CurrentField);
            UserOps.TheFieldHandler( FrameRec,
                AbsFldCol, AbsFldRow, LastKey, ReturnValue );
            ScrnUtl1.GetFieldRec( FrameRec, FrameRec^.CurrentField,
                FieldRec );
            IF FieldRec.ChangeMade THEN
              FrameRec^.FrameChanged := TRUE;
            END;
          END;
          IF PosUtils.Equal( 'MovePointerBar', ReturnValue ) THEN
            StrEdit.AssignStr( ScrnTypes.ContinueInput, ReturnValue );
            MovePointerBar( FrameRec, FrameRec^.CurrentField );
          ELSE
            ScrnUtl1.SetCurrentField( FrameRec, SavedFieldNum );
            IF PosUtils.Equal( ReturnValue, ScrnTypes.ContinueInput ) THEN
              (* Now, process defined action keys *)
              NormalKeyResponse( FrameRec, FieldRec, LastKey, ReturnValue );
            END;
          END;

          IF (NOT PosUtils.Equal(ReturnValue, ScrnTypes.ContinueInput))
              AND (LastKey # UserOps.BackupKey)
              AND (LastKey # UserOps.ExitKey) THEN
            (* Looks like they want to submit the screen.  Let's
               check to see if all required fields are full *)
            IF PosUtils.Equal( ReturnValue, ScrnTypes.SubmitInput ) THEN
              ReturnValue := FrameRec^.normlnext;
            END;
            IF PosUtils.Equal( ReturnValue, ScrnTypes.CancelInput ) THEN
              ReturnValue := FrameRec^.parent;
            ELSIF (NOT RequiredFilled( FrameRec, LandingField )) THEN
              StrEdit.AssignStr( RequiredMessage, LocalMessage );
              LastKey := 65535;
              StrEdit.AssignStr( ScrnTypes.ContinueInput,
                  ReturnValue );
                (*We do this to make sure we go back through the loop.*)
            END;
          END;
        END;

      UNTIL (NOT PosUtils.Equal(ReturnValue, ScrnTypes.ContinueInput));

      M2Strings.Assign( ReturnValue, NextFrame );
(*
      IF MaxChoices > 0 THEN
        FramePainter.RedrawField( FrameRec, FrameRec^.CurrentField, FALSE );
      END;
        Taken care of by RepaintVisibleArea, below.
*)
      FrameRec^.action := CAP( FrameRec^.action );
      IF FrameRec^.ExitBox[0] # 0C THEN
        (*Now we change the appearance of the border to let the
          user know the frame is no longer active.*)
        ScrnUtl1.BoxFrame( FrameRec, FALSE );
      END;
      IF FrameRec^.ClearAfter THEN
        FrameManager.EraseFrame( FrameRec );
      ELSE
        RepaintVisibleArea();
          (* Erases pointer bar and selection characters.  We do
             this mostly to avoid the problem of restoring things
             like highlighted selection characters when things
             pop up over inactive frames. *)
      END;
    END ControlFrame;


BEGIN
  Initialized := FALSE;
  Init();
END InputManager.