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RL_PICKR.PRG
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1989-08-23
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* Function: PICKREC
* Author..: Richard Low
* Syntax..: PICKREC( top, left, bottom, right, output, proc, condition, row )
* Notes...: Function for cursoring through a box-menu selection of records
* from the currently selected database, and selecting a record
* to work with by pressing the enter key.
* Returns.: The row number of the selected record, or zero if the Escape
* Key was pressed to exit. If either the insert or delete keys
* are pressed, the routine exits to the calling procedure which
* can test for Insert or Delete with the LASTKEY() function.
*
* Assumes.: Expects to be passed the following parameters:
*
* top = exp<N> - top row of the box contents
* left = exp<N> - top left column of box contents
* bottom = exp<N> - bottom row of box contents
* right = exp<N> - bottom column of box contents
* output = exp<C> - character expression for output display
* proc = exp<C> - Optional PROCEDURE to call on each keypress
* condition = exp<C> - Optional condition expression
* row = exp<N> - current row number (used to reposition bar)
* = 0 - GO TOP and fill the box with records
* < 0 - erase box and re-fresh from current record
*
* If a parameter is to be skipped, pass a 'dummy' parameter
* such as a null string in place of the actual parameter.
*
* Ex: foutput = "Lastname + ', ' + Firstname"
*
* rownum = PICKREC( 6, 40, 18, 78, foutput, 'REDISPLAY', '', rownum )
*
FUNCTION PICKREC
PARAMETERS p_top, p_left, p_bot, p_rite, p_output, p_proc, p_cond, p_row
PRIVATE do_proc, num_cols, padding, mrec, lkey, counter, f_rowcount,;
in_color, f_bright, f_reverse, f_seekstr
*-- verify first 5 parameters given are correct type
IF TYPE('p_top') + TYPE('p_left') + TYPE('p_bot') +;
TYPE('p_rite') + TYPE('p_output') != 'NNNNC'
RETURN 0
ENDIF
*-- verify procedure name is a character string
p_proc = IF( TYPE('p_proc') = 'C', p_proc, '' )
do_proc = (.NOT. EMPTY(p_proc))
*-- verify any condition given is a character string
p_cond = IF( TYPE('p_cond') = 'C', p_cond, '.T.' )
*-- and that it evaluates to a logical answer
IF TYPE(p_cond) != 'L'
p_cond = '.T.'
ENDIF
*-- get incoming color setting and build the bright and reverse settings
in_color = UPPER(SETCOLOR())
f_bright = BRIGHT(in_color)
f_reverse = GETPARM(2,in_color)
SETCOLOR(in_color)
num_cols = p_rite - p_left + 1 && available width in box
IF LEN(&p_output) > num_cols
p_output = 'SUBSTR(' + p_output + ',1,num_cols)' && shorten output
ENDIF
IF LEN(&p_output) < num_cols
padding = SPACE( num_cols - LEN(&p_output) )
p_output = p_output + " + padding" && pad output with spaces
ENDIF
IF TYPE('p_row') != 'N'
p_row = 0
ENDIF
IF p_row <= 0 && first time being called by proc
IF p_row = 0
IF p_cond = '.T.' && if no condition provided
GO TOP && go to top of database
ELSE
*-- if the current record does not meet the supplied condition
IF .NOT. &p_cond
*-- position the record pointer to EOF()
GO BOTTOM
SKIP
ENDIF
*-- otherwise, find first record meeting the condition specified
DO WHILE (&p_cond) .AND. (.NOT. BOF())
mrec = RECNO()
SKIP-1
IF BOF() .OR. (.NOT. (&p_cond))
GOTO mrec
EXIT
ENDIF
ENDDO
ENDIF
ENDIF
mrec = RECNO() && x marks the spot
@ p_top,p_left SAY ' ' && put normal video blank, otherwise scroll get reverse
SCROLL( p_top, p_left, p_bot, p_rite, 0 ) && clear inside of box to be filled with records
p_row = p_top && set up first row for display
DO WHILE p_row <= p_bot .AND. (&p_cond) .AND. (.NOT. EOF()) && fill box with available records
@ p_row,p_left SAY &p_output && from database in normal video
p_row = p_row + 1
SKIP
ENDDO
p_row = p_top && set back to first row
GOTO mrec && go back to where we started
ENDIF
f_rowcount = p_bot - p_top + 1
f_seekstr = "" && string to initialize for key searches
DO WHILE .T.
SETCOLOR(f_reverse)
@ p_row, p_left SAY &p_output
SETCOLOR(in_color)
*-- do routine if it exists and they are not stomping on a key
IF do_proc .AND. NEXTKEY() = 0
DO &p_proc
ENDIF
mrec = RECNO()
lkey = INKEY(0)
DO CASE
CASE lkey = 5
*-- Up Arrow
f_seekstr = '' && cancel current search string
@ p_row, p_left SAY &p_output
SKIP-1
IF BOF() .OR. (.NOT. (&p_cond))
GOTO mrec
LOOP
ENDIF
p_row = p_row - 1
IF p_row < p_top
SCROLL( p_top, p_left, p_bot, p_rite, -1 )
p_row = p_top
ENDIF
CASE lkey = 24
*-- DownArrow
f_seekstr = '' && cancel current search string
@ p_row, p_left SAY &p_output
SKIP
IF EOF() .OR. (.NOT. (&p_cond))
GOTO mrec
LOOP
ENDIF
p_row = p_row + 1
IF p_row > p_bot
SCROLL( p_top, p_left, p_bot, p_rite, 1 )
p_row = p_bot
ENDIF
CASE lkey = 27
*-- EscapeKey
@ p_row, p_left SAY &p_output
p_row = 0
EXIT
CASE lkey = 13
*-- EnterKey
SETCOLOR(f_bright)
@ p_row, p_left SAY &p_output
SETCOLOR(in_color)
EXIT
CASE lkey = 18
*-- PageUp
f_seekstr = '' && cancel current search string
FOR counter = 1 TO f_rowcount
@ p_row,p_left SAY &p_output
mrec = RECNO()
SKIP-1
IF BOF() .OR. (.NOT. (&p_cond))
GOTO mrec
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
EXIT
ENDIF
p_row = p_row - 1
IF p_row < p_top
SCROLL( p_top, p_left, p_bot, p_rite, -1 )
p_row = p_top
ENDIF
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
NEXT counter
CASE lkey = 3
*-- PageDown
f_seekstr = '' && cancel current search string
FOR counter = 1 TO f_rowcount
@ p_row,p_left SAY &p_output
mrec = RECNO()
SKIP
IF EOF() .OR. (.NOT. (&p_cond))
GOTO mrec
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
EXIT
ENDIF
p_row = p_row + 1
IF p_row > p_bot
SCROLL( p_top, p_left, p_bot, p_rite, 1 )
p_row = p_bot
ENDIF
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
NEXT counter
CASE lkey = 1
*-- Home Key
f_seekstr = '' && cancel current search string
IF p_cond = '.T.'
*-- if no condition supplied, go to top of database
GO TOP
ELSE
*-- otherwise, find first record meeting condition
DO WHILE (&p_cond) .AND. (.NOT. BOF())
mrec = RECNO()
SKIP-1
IF BOF() .OR. (.NOT. (&p_cond))
GOTO mrec
EXIT
ENDIF
ENDDO
ENDIF
*-- now clear window and display records
mrec = RECNO()
@ p_top,p_left SAY ' ' && put normal video blank, otherwise scroll get reverse
SCROLL( p_top, p_left, p_bot, p_rite, 0 ) && clear inside of box to be filled with records
p_row = p_top
DO WHILE p_row <= p_bot .AND. (&p_cond) .AND. (.NOT. EOF())
@ p_row,p_left SAY &p_output
p_row = p_row + 1
SKIP
ENDDO
p_row = p_top
GOTO mrec
CASE lkey = 6
*-- End Key
f_seekstr = '' && cancel current search string
lkey = 0
DO WHILE lkey = 0 .AND. (&p_cond) .AND. (.NOT. EOF())
@ p_row,p_left SAY &p_output
mrec = RECNO()
SKIP
IF EOF() .OR. (.NOT. (&p_cond))
GOTO mrec
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
EXIT
ENDIF
p_row = p_row + 1
IF p_row > p_bot
SCROLL( p_top, p_left, p_bot, p_rite, 1 )
p_row = p_bot
ENDIF
SETCOLOR(f_reverse)
@ p_row,p_left SAY &p_output
SETCOLOR(in_color)
lkey = INKEY()
ENDDO
CASE lkey = 22
*-- Insert Key
SETCOLOR(in_color)
@ p_row, p_left SAY &p_output
EXIT
CASE lkey = 7
*-- Delete Key
EXIT
* CASE lkey = 28
* *-- F1 = Help Key
* DO Help WITH PROCNAME(), PROCLINE(), "LKEY"
CASE lkey > 31 .AND. lkey < 127 && printable character range
IF EMPTY(INDEXKEY(0)) && if no index is controlling
LOOP && skip this proc
ENDIF
mrec = RECNO() && save record number
f_seekstr = f_seekstr + UPPER(CHR(lkey))
SEEK f_seekstr && seek upper case first
IF EOF() .OR. (.NOT. (&p_cond))
SEEK LOWER(f_seekstr) && try finding lower case match
IF EOF() .OR. (.NOT. (&p_cond))
f_seekstr = ''
GOTO mrec
?? CHR(7)
LOOP
ENDIF
ENDIF
mrec = RECNO()
@ p_top,p_left SAY ' ' && put normal video blank, otherwise scroll get reverse
SCROLL( p_top, p_left, p_bot, p_rite, 0 ) && clear inside of box to be filled with records
p_row = p_top && set up first row for display
DO WHILE p_row <= p_bot .AND. (&p_cond) .AND. (.NOT. EOF()) && fill box with available records
@ p_row,p_left SAY &p_output && from database in normal video
p_row = p_row + 1
SKIP
ENDDO
p_row = p_top && set back to first row
GOTO mrec
ENDCASE
ENDDO
SETCOLOR(in_color)
RETURN (p_row)