C/C++ Users Group Library 1996 July/C-C++ Users Group Library July 1996.iso/listings/v_02_09/2n09018a

Text File | 1991-07-29 | 5.8 KB | 134 lines

  PICK.SECS FUNCTION (ACTION)
  ACTION EXTERNAL

      SCREEN, VARIABLES
          EXCLUDED FROM LISTING
      CODE
  ! SET SCREEN COLORS
  SETHUE(STG:COLORS[SCR_SEC_KIND, SCR_TAB_TYPE, 1], |
      STG:COLORS[SCR_SEC_KIND, SCR_TAB_TYPE, 2])
  OPEN(SCREEN)                      !OPEN THE SCREEN
  SETCURSOR                         !TURN OFF ANY CURSOR

  NDX = 1                           !PUT SELECTOR BAR ON TOP ITEM
  ROW = ROW(?POINT)                 !REMEMBER TOP ROW AND
  COL = COL(?POINT)                 !LEFT COLUMN OF SCROLL AREA
  CLEAR_TAGS()                      !CLEAR TAG TABLE
  SET(SEC:SYMBOL_KEY)
  DO SHOW_TABLE
  MAX = RECORDS(SEC:SYMBOL_KEY)
  LOOP                              !LOOP UNTIL USER EXITS
    IF MAX > COUNT THEN MAX = COUNT.!COUNT AND SCROLL ITEM COUNT
    POINTER# = 0                    !CLEAR POINTER
    ALERT                           !RESET ALERTED KEYS
    ALERT(REJECT_KEY)               !ALERT SCREEN REJECT KEY
    ALERT(ACCEPT_KEY)               !ALERT SCREEN ACCEPT KEY
    ALERT(ESC_KEY)
    ACCEPT                          !READ A FIELD
    IF ~RECORDS(SECURITY)           !IF THERE ARE NO RECORDS
      NO_RECS(ROW(?POINT),COL(?POINT)) ! SHOW MESSAGE
    .
    CASE KEYCODE()                  !PROCESS THE KEYSTROKE
    OF REJECT_KEY
    OROF ESC_KEY
    OROF ACCEPT_KEY
      BREAK                         !END LOOP
    OF ENTER_KEY                    !ENTER KEY OR
      DO GET_RECORD                 !SET TBLPTR
      TAG_IT(POINTER(SECURITY))     !TAG THIS RECORD
      DO SHOW_RECORD
      SKIP(SECURITY,COUNT-NDX)
      IF NDX < COUNT
        NDX += 1                    !AND MOVE DOWN ONE
      ELSE
        IF NOT EOF(SECURITY)        !IF THERE ARE MORE RECORDS
          SCROLL(ROW,COL,ROWS,COLS,ROWS(?POINT)) ! SCROLL UP
          NEXT(SECURITY)            !READ THE BOTTOM RECORD
          DO SHOW_RECORD            !AND DISPLAY IT
      . .
    OF DOWN_KEY                     !DOWN ARROW KEY
      IF NOT EOF(SECURITY)          !IF THERE ARE MORE RECORDS
        SCROLL(ROW,COL,ROWS,COLS,ROWS(?POINT)) !SCROLL UP
        NEXT(SECURITY)                   !READ THE BOTTOM RECORD
        DO SHOW_RECORD                   !AND DISPLAY IT
      .
    OF PGDN_KEY                     !PAGE DOWN KEY
      IF EOF(SECURITY)              !ON THE LAST PAGE
        NDX = MAX                        !POINT TO BOTTOM ITEM
      ELSE                          !OTHERWISE
        DO SHOW_TABLE                    !DISPLAY NEXT PAGE
      .

    OF CTRL_PGDN                    !CTRL-PAGE DOWN KEY
      NDX = MAX                     !POINT TO BOTTOM ITEM
      IF NOT EOF(SECURITY)          !ON THE LAST PAGE
        SET(SEC:SYMBOL_KEY)         !SET TO BOTTOM RECORD MINUS
        SKIP(SECURITY,-COUNT)       !ONE PAGE OF RECORDS
        DO SHOW_TABLE                    !DISPLAY THE LAST PAGE
      .
    OF UP_KEY                       !UP ARROW KEY
      SKIP(SECURITY,-(COUNT-1))     !SET TO TOP RECORD MINUS 1
      IF NOT BOF(SECURITY)          !IF THERE IS A PRIOR RECORD
        PREVIOUS(SECURITY)               !READ THE TOP RECORD
        IF NOT ERROR()                   !IF READ A RECORD
          SCROLL(ROW,COL,ROWS,COLS,-(ROWS(?POINT)))!SCROLL DOWN
          DO SHOW_RECORD            !AND DISPLAY IT
      . .
      SKIP(SECURITY,COUNT-1)        !SET RECORD FOR NEXT PAGE
    OF PGUP_KEY                     !PAGE UP KEY
      SKIP(SECURITY,-(COUNT-1))     !SET TO TOP RECORD MINUS ONE
      IF BOF(SECURITY)              !IF THERE IS NO PRIOR RECORD
        NDX = 1                     !THEN POINT TO TOP ITEM
        SKIP(SECURITY,COUNT-1)      !SET RECORD FOR THIS PAGE
      ELSE                          !OTHERWISE
        SKIP(SECURITY,-(COUNT+1))   !SET RECORD FOR PRIOR PAGE
        DO SHOW_TABLE                    !AND DISPLAY THE PAGE
      .
    OF CTRL_PGUP                    !CTRL-PAGE UP
      SET(SEC:SYMBOL_KEY)           !SET TO FIRST RECORD
      NDX = 1                       !POINT TO TOP ITEM
      DO SHOW_TABLE                 !AND DISPLAY THE PAGE
  . .
  SETHUE()                          !RESET COLORS
  IF ANY_TAGS() THEN RETURN(ACT_DONE). !RETURN DONE IF ANY TAGGED
  RETURN(ACTION)                    !NOT DONE IF NONE TAGGED

SHOW_TABLE ROUTINE                  !DISPLAY A PAGE OF RECORDS
  SKIP(SECURITY,COUNT-1)            !SET TO THE BOTTOM RECORD
  IF EOF(SECURITY)                  !FOR A PARTIAL PAGE
    SET(SEC:SYMBOL_KEY)             !SET TO THE LAST RECORD
    SKIP(SECURITY,-COUNT)           !AND BACK UP ONE PAGE
  ELSE                              !OTHERWISE
    SKIP(SECURITY,-(COUNT-1))       !SET RECORD FOR THIS PAGE
  .
  NDX# = NDX                        !SAVE REPEAT INDEX
  LOOP NDX = 1 TO COUNT             !LOOP THRU THE SCROLL AREA
    IF EOF(SECURITY) THEN BREAK.    !BREAK ON END OF FILE
    NEXT(SECURITY)                  !READ THE NEXT RECORD
    DO SHOW_RECORD                  !AND DISPLAY IT
  .
  NDX = NDX#
  IF RECORDS(SEC:SYMBOL_KEY) < COUNT !IF RECORDS DO NOT FILL
     NDX#= RECORDS(SEC:SYMBOL_KEY)
     BLANK(ROW + NDX#,COL,ROWS-NDX#,COLS) !BLANK REMAINING AREA
  .

SHOW_RECORD  ROUTINE                !DISPLAY SCROLLING LINE
  SCR:SYMBOL = SEC:SYMBOL
  SCR:NAME = SEC:NAME
  IF IS_TAG(POINTER(SECURITY))      !IF RECORD TAGGED,SHOW CHECK
      SCR:TAG = '√'
  ELSE
      SCR:TAG = ' '                 !RECORD NOT TAGGED,SHOW SPACE
  .

GET_RECORD ROUTINE                  !READ SELECTED RECORD
  SKIP(SECURITY,-(MAX-NDX+1))       !SET TO SELECTED RECORD
  NEXT(SECURITY)                    !AND READ IT

SAME_PAGE ROUTINE                   !SET TO SAME PAGE ROUTINE
  POINTER# = POINTER(SECURITY)      !SAVE ITS RECORD POINTER
  GET(SECURITY,POINTER#)            !GET THE RECORD
  SET(SEC:SYMBOL_KEY,SEC:SYMBOL_KEY) !SET TO THE SAME RECORD
  SKIP(SECURITY,-1)                 !SKIP TO TOP OF SAME PAGE