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tbwhile.prg
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1991-08-15
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/*
* File......: TBWHILE.PRG
* Author....: Jim Orlowski
* Date......: $Date: 15 Aug 1991 23:04:20 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/tbwhile.prv $
*
* This is an original work by Jim Orlowski and is placed in the
* public domain.
*
* The tricks are:
*
* 1. Setting up functions for goTop() and goBottom() so that you can
* quickly move to the right record when the user presses the
* Ctrl-PgUp ( goTop() ) and Ctrl-PgDn ( goBottom() ) keys.
*
* 2. Passing and evaluating the block for the TbSkipWhil().
*
* Modification history:
* ---------------------
*
* $Log: E:/nanfor/src/tbwhile.prv $
*
* Rev 1.2 15 Aug 1991 23:04:20 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:53:08 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:02:22 GLENN
* Nanforum Toolkit
*
*/
#command DEFAULT <param> TO <val> [, <paramn> TO <valn> ];
=> ;
<param> := IIF(<param> = NIL, <val>, <param> ) ;
[; <paramn> := IIF(<paramn> = NIL, <valn>, <paramn> ) ]
#include "inkey.ch"
#ifdef FT_TEST
/*
* THIS DEMO SHOWS TBNAMES.DBF CONSISTING OF LAST, FIRST, ADDR, CITY,
* STATE, ZIP WITH ACTIVE INDEX ON LAST + FIRST. IT SHOWS LAST NAME,
* FIRST NAME, CITY ONLY FOR THOSE LAST NAMES THAT BEGIN WITH LETTER
* THAT YOU INPUT FOR THE CKEY GET.
*
* TBNAMES.DBF/.NTX ARE AUTOMATICALLY CREATED BY THIS TEST PROGRAM
*/
#INCLUDE "SETCURS.CH"
FUNCTION TBWHILE()
LOCAL aFields := {}, cKey := "O", cOldColor
LOCAL nFreeze := 1, lSaveScrn := .t., nRecSel
LOCAL cColorList := "N/W, N/BG, B/W, B/BG, B/W, B/BG, R/W, B/R"
LOCAL cColorShad := "N/N"
MEMVAR GetList
IF ! FILE( "TBNAMES.DBF" )
MAKE_DBF()
ENDIF
USE TBNames
IF ! FILE( "TBNAMES.NTX" )
INDEX ON last + first TO TBNAMES
ENDIF
SET INDEX TO TBNAMES
* Pass Heading as character and Field as Block including Alias
* To eliminate the need to use FIELDWBLOCK() function in FT_BRWSWHL()
AADD(aFields, {"Last Name" , {||TBNames->Last} } )
AADD(aFields, {"First Name", {||TBNames->First} } )
AADD(aFields, {"City" , {||TBNames->City} } )
cOldColor := SetColor("N/BG")
CLEAR SCREEN
@ 5,10 SAY "Enter First Letter Of Last Name:" GET cKey PICTURE "!"
READ
* TBNames->Last = cKey is the Conditional Block passed to this function
* you can make it as complicated as you want, but you would then
* have to modify TBWhileSet() to find first and last records
* matching your key.
nRecSel := FT_BRWSWHL( aFields, {||TBNames->Last = cKey}, cKey, nFreeze,;
lSaveScrn, cColorList, cColorShad, 3, 6, MaxRow() - 2, MaxCol() - 6)
* Note you can use Compound Condition
* such as cLast =: "Pierce " and cFirst =: "Hawkeye "
* by changing above block to:
* {||TBNames->Last = cLast .AND. TBNames->First = cFirst}
* and setting cKey := cLast + cFirst
?
IF nRecSel == 0
? "Sorry, NO Records Were Selected"
ELSE
? "You Selected " + TBNames->Last +" "+ ;
TBNames->First +" "+ TBNames->City
ENDIF
?
WAIT
SetColor(cOldColor)
CLEAR SCREEN
RETURN nil
STATIC FUNCTION make_dbf
LOCAL x, aData := { ;
{ "SHAEFER","KATHRYN","415 WEST CITRUS ROAD #150","LOS ANGELES","CA","90030" },;
{ "OLSON","JAMES","225 NORTH RANCH ROAD","LOS ANGELES","CA","90023" },;
{ "KAYBEE","JOHN","123 SANDS ROAD","CAMARILLO","CA","93010" },;
{ "HERMAN","JIM","123 TOON PAGE ROAD","VENTURA","CA","93001" },;
{ "BURNS","FRANK","123 VIRGINA STREET","OXNARD","CA","93030" },;
{ "PIERCE","HAWKEYE","123 OLD TOWN ROAD","PORT MUGU","CA","93043" },;
{ "MORGAN","JESSICA","123 FRONTAGE ROAD","CAMARILLO","CA","93010" },;
{ "POTTER","ROBERT","123 FIR STREET","OXNARD","CA","93030" },;
{ "WORTH","MARY","123-1/2 JOHNSON DRIVE","OXNARD","CA","93033" },;
{ "JOHNSON","SUSAN","123 QUEENS STREET","OXNARD","CA","93030" },;
{ "SAMSON","SAM","215 MAIN STREET","OXNARD","CA","93030" },;
{ "NEWNAME","JAMES","215 MAIN STREET","LOS ANGELES","CA","90000" },;
{ "OLEANDAR","JILL","425 FLORAL PARK DRIVE","FLORAL PARK","NY","10093" },;
{ "SUGARMAN","CANDY","1541 SWEETHEART ROAD","HERSHEY","PA","10132" } }
DbCreate( "TBNAMES", { { "LAST ", "C", 18, 0, } ,;
{ "FIRST", "C", 9, 0, } ,;
{ "ADDR ", "C", 28, 0, } ,;
{ "CITY ", "C", 21, 0, } ,;
{ "STATE", "C", 2, 0, } ,;
{ "ZIP ", "C", 9, 0, } } )
USE tbnames
FOR x := 1 TO Len( aData )
APPEND BLANK
Aeval( aData[x], {|e,n| FieldPut( n, e ) } )
NEXT
USE
RETURN NIL
#endif
/* $DOC$
* $FUNCNAME$
* FT_BRWSWHL()
* $CATEGORY$
* Menus/Prompts
* $ONELINER$
* Browse an indexed database limited to a while condition
* $SYNTAX$
* FT_BRWSWHL( <aFields>, <bWhileCond>, <cKey>, ;
* [ <nFreeze> ], [ <lSaveScrn> ], [ <cColorList> ], ;
* [ <cColorShadow> ], [ <nTop> ], [ <nLeft> ], ;
* [ <nBottom> ], [ <nRight> ] -> nRecno
* $ARGUMENTS$
* <aFields> is array of field blocks of fields you want to display.
* Example to set up last name and first name in array:
* aFields := {}
* AADD(aFields, {"Last Name" , {||Names->Last} } )
* AADD(aFields, {"First Name", {||Names->First} } )
*
* <bWhileCond> is the limiting WHILE condition as a block.
* Example 1: { ||Names->Last == "JONES" }
* Example 2: { ||Names->Last == "JONES" .AND. Names->First == "A" }
*
* <cKey> is the key to find top condition of WHILE.
* cLast := "JONES "
* cFirst := "A"
* Example 1: cKey := cLast
* Example 2: cKey := cLast + cFirst
*
* <nFreeze> is number of fields to freeze in TBrowse. Defaults
* to 0 if not passed.
*
* <lSaveScrn> is a logical indicating whether or not you want to
* save the screen from the calling program. Defaults to .T. if
* not passed.
*
* <cColorList> is a list of colors for the TBrowse columns.
* The 1st color is used as SAY/TBrowse Background and the
* 3rd and 4th colors are used as part of column:defColor := {3, 4}
* Thus if you pass a cColorList, you MUST pass at least 4 colors.
* Defaults to "N/W, N/BG, B/W, B/BG, B/W, B/BG, R/W, B/R" if not passed.
*
* <cColorShad> is the color of the TBrowse box shadow. Defaults
* to "N/N" if not passed.
*
* <nTop>, <nLeft>, <nBottom>, <nRight> are the coordinates of
* the area to display the TBrowse in. Defaults to 2, 2,
* MAXROW() - 2, MAXCOL() - 2 with shadowed box, i.e. full screen.
* $RETURNS$
* nRecno is the number of the record selected by the <Enter> key.
* 0 is returned if there are either no records matching the WHILE
* condition or an <Esc> is pressed instead of an <Enter>
* $DESCRIPTION$
* This is a demonstration of TBrowse with a WHILE condition for an
* indexed database.
* $EXAMPLES$
* * This example will only show those people with last name of "JONES"
* * in the TBNames.dbf which contains at least the fields:
* * Last, First, City AND is indexed on Last + First.
* LOCAL nRecSel := 0
* LOCAL aFields := {}
* LOCAL bWhile := {||TBNames->Last = "JONES"}
* LOCAL cKey := "JONES"
* LOCAL nFreeze := 1
* LOCAL lSaveScrn := .t.
* LOCAL cColorList := "N/W, N/BG, B/W, B/BG, B/W, B/BG, R/W, B/R"
* LOCAL cColorShad := "N/N"
*
* USE TBNames INDEX TBNames NEW // indexed on Last + First
*
* * Pass Heading as character and Field as Block including Alias
* * To eliminate the need to use FIELDWBLOCK() function in FT_BRWSWHL()
* AADD(aFields, {"Last Name" , {||TBNames->Last} } )
* AADD(aFields, {"First Name", {||TBNames->First} } )
* AADD(aFields, {"City" , {||TBNames->City} } )
*
* IF FT_BRWSWHL( aFields, bWhile, cKey, nFreeze, lSaveScrn, ;
* cColorList, cColorShad, 3, 6, MaxRow() - 2, MaxCol() - 6) == 0
* ? "Sorry, NO Records Were Selected"
* ELSE
* ? "You Selected: " + TBNames->Last +" "+ ;
* TBNames->First +" "+ TBNames->City
* ENDIF
* $END$
*/
FUNCTION FT_BRWSWHL(aFields, bWhileCond, cKey, nFreeze, lSaveScrn, ;
cColorList, cColorShad, nTop, nLeft, nBottom, nRight )
LOCAL b, column, cType, i
LOCAL cHead, bField, lKeepScrn, cScrnSave
LOCAL cColorSave, cColorBack, nCursSave
LOCAL lMore, nKey, nPassRec
DEFAULT nFreeze TO 0, ;
lSaveScrn TO .t., ;
cColorList TO "N/W, N/BG, B/W, B/BG, B/W, B/BG, R/W, B/R", ;
cColorShad TO "N/N", ;
nTop TO 2, ;
nLeft TO 2, ;
nBottom TO MaxRow() - 2, ;
nRight TO MaxCol() - 2
lKeepScrn := (PCOUNT() > 6)
SEEK cKey
IF .NOT. FOUND() .OR. LASTREC() == 0
RETURN(0)
ENDIF
/* make new browse object */
b := TBrowseDB(nTop, nLeft, nBottom, nRight)
/* default heading and column separators */
b:headSep := "═╤═"
b:colSep := " │ "
b:footSep := "═╧═"
/* add custom 'TbSkipWhil' (to handle passed condition) */
b:skipBlock := {|x| TbSkipWhil(x, bWhileCond)}
/* Set up substitute goto top and goto bottom */
/* with While's top and bottom records */
b:goTopBlock := {|| TbWhileTop(cKey)}
b:goBottomBlock := {|| TbWhileBot(cKey)}
/* colors */
b:colorSpec := cColorList
/* add a column for each field in the current workarea */
FOR i = 1 TO LEN(aFields)
cHead := aFields[i, 1]
bField := aFields[i, 2]
/* make the new column */
column := TBColumnNew( cHead, bField )
/* these are color setups from tbdemo.prg from Nantucket */
* IF ( cType == "N" )
* column:defColor := {5, 6}
* column:colorBlock := {|x| if( x < 0, {7, 8}, {5, 6} )}
*ELSE
* column:defColor := {3, 4}
*ENDIF
/* To simplify I just used 3rd and 4th colors from passed cColorList */
/* This way 1st is SAY, 2nd is GET, 3rd and 4th are used here,
/* 5th is Unselected Get, extras can be used as in tbdemo.prg */
column:defColor := {3, 4}
b:addColumn(column)
NEXT
/* freeze columns */
IF nFreeze <> 0
b:freeze := nFreeze
ENDIF
/* save old screen and colors */
IF lSaveScrn
cScrnSave = SAVESCREEN(0, 0, 24, 79)
ENDIF
cColorSave := SetColor()
/* Background Color Is Based On First Color In Passed cColorList
cColorBack := IF(',' $ cColorList, ;
SUBSTR(cColorList, 1, AT(',', cColorList) - 1), cColorList )
IF .NOT. lKeepScrn
SetColor(cColorBack)
CLEAR SCREEN
ENDIF
/* make a window shadow */
SetColor(cColorShad)
@ nTop+1, nLeft+1 CLEAR TO nBottom+1, nRight+1
SetColor(cColorBack)
@ nTop, nLeft CLEAR TO nBottom, nRight
SetColor(cColorSave)
nCursSave := SetCursor(0)
lMore := .t.
WHILE (lMore)
/* stabilize the display */
WHILE ( .NOT. b:stabilize() )
nKey := INKEY()
IF ( nKey <> 0 )
EXIT /* (abort IF a key is waiting) */
ENDIF
ENDDO
IF ( b:stable )
/* display is stable */
IF ( b:hitTop .OR. b:hitBottom )
Tone(125, 0)
ENDIF
/* everything's done; just wait for a key */
nKey := INKEY(0)
ENDIF
/* process key */
DO CASE
CASE ( nKey == K_DOWN )
b:down()
CASE ( nKey == K_UP )
b:up()
CASE ( nKey == K_PGDN )
b:pageDown()
CASE ( nKey == K_PGUP )
b:pageUp()
CASE ( nKey == K_CTRL_PGUP )
b:goTop()
CASE ( nKey == K_CTRL_PGDN )
b:goBottom()
CASE ( nKey == K_RIGHT )
b:right()
CASE ( nKey == K_LEFT )
b:left()
CASE ( nKey == K_HOME )
b:home()
CASE ( nKey == K_END )
b:end()
CASE ( nKey == K_CTRL_LEFT )
b:panLeft()
CASE ( nKey == K_CTRL_RIGHT )
b:panRight()
CASE ( nKey == K_CTRL_HOME )
b:panHome()
CASE ( nKey == K_CTRL_END )
b:panEnd()
CASE ( nKey == K_ESC )
nPassRec := 0
lMore := .f.
CASE ( nKey == K_RETURN )
nPassRec := RECNO()
lMore := .f.
ENDCASE
ENDDO // for WHILE (lmore)
/* restore old screen */
IF lSaveScrn
RESTSCREEN(0, 0, 24, 79, cScrnSave)
ENDIF
SetCursor(nCursSave)
SetColor(cColorSave)
RETURN (nPassRec)
STATIC FUNCTION TbSkipWhil(n, bWhileCond)
LOCAL i
i := 0
IF ( LASTREC() <> 0 )
IF ( n == 0 )
SKIP 0
ELSEIF ( n > 0 .AND. RECNO() <> LASTREC() )
WHILE ( i < n )
SKIP 1
IF ( EOF() .OR. .NOT. Eval(bWhileCond) )
SKIP -1
EXIT
ENDIF
i++
ENDDO
ELSEIF ( n < 0 )
WHILE ( i > n )
SKIP -1
IF ( BOF() )
EXIT
ELSEIF .NOT. Eval( (bWhileCond) )
SKIP
EXIT
ENDIF
i--
ENDDO
ENDIF
ENDIF
RETURN (i)
* EOFcn TbSkipWhil()
STATIC FUNCTION TbWhileTop(cKey)
SEEK cKey
RETURN NIL
STATIC FUNCTION TbWhileBot(cKey)
* SeekLast: Finds Last Record For Matching Key
* Developed By Jon Cole
* With softseek set on, seek the first record after condition.
* This is accomplished by incrementing the right most character of the
* string cKey by one ascii character. After SEEKing the new string,
* back up one record to get to the last record which matches cKey.
#include "set.ch"
LOCAL cSoftSave := SET(_SET_SOFTSEEK, .t.)
SEEK LEFT(cKey, LEN(cKey) -1) + CHR( ASC( RIGHT(cKey,1) ) +1)
SET(_SET_SOFTSEEK, cSoftSave)
SKIP -1
RETURN NIL