Difference between revisions of "MOUSEWHEEL"

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     DO WHILE {{Cl|_MOUSEINPUT}}
 
     DO WHILE {{Cl|_MOUSEINPUT}}
 
       Scroll = Scroll + {{Cl|_MOUSEWHEEL}}
 
       Scroll = Scroll + {{Cl|_MOUSEWHEEL}}
       LOCATE 10, 20: PRINT Scroll
+
       LOCATE 10, 20: PRINT Scroll; {{Cl|SPACE$}}(2)
 
     LOOP
 
     LOOP
 
  LOOP UNTIL INKEY$ = CHR$(13) ' press Enter to quit
 
  LOOP UNTIL INKEY$ = CHR$(13) ' press Enter to quit

Revision as of 07:51, 3 January 2011

The _MOUSEWHEEL function returns a positive or negative INTEGER value indicating the mouse scroll wheel clicks since the last mouse read.


Syntax

scroll% = _MOUSEWHEEL


Description

  • Positive return value of 1 represents one "click" the mouse wheel was moved toward the user.
  • Negative return value of -1 represents one "click" the mouse wheel was moved away from the user.
  • After a "click" has been read, the value resets to 0 automatically.
  • If no movement on the wheel has occurred since the last _MOUSEINPUT read, _MOUSEWHEEL returns 0.
  • You may want to use a cumulative mouse wheel scroll value using a total variable.


Example 1: Reading the cumulative mouse wheel "clicks" (Enter quits).

DO: _LIMIT 100 DO WHILE _MOUSEINPUT Scroll = Scroll + _MOUSEWHEEL LOCATE 10, 20: PRINT Scroll; SPACE$(2) LOOP LOOP UNTIL INKEY$ = CHR$(13) ' press Enter to quit


Example 2: A simple text scrolling routine using the mouse wheel value to read a text array.

DIM Array$(100) LINE INPUT "Enter a file name with 100 or more lines of text: ", file$ OPEN file$ FOR INPUT AS #1 DO UNTIL EOF(1) inputcount = inputcount + 1 LINE INPUT #1, Array$(inputcount) IF inputcount = 100 THEN EXIT DO LOOP FOR n = 1 TO 21: PRINT Array$(n): NEXT CLOSE #1 DO DO WHILE _MOUSEINPUT row = row + _MOUSEWHEEL IF prevrow <> row THEN 'look for a change in row value IF row > 0 AND row <= inputcount - 20 THEN CLS: LOCATE 2, 1 FOR n = row TO row + 20 PRINT Array$(n) NEXT END IF END IF prevrow = row 'store previous row value LOOP LOOP UNTIL INKEY$ > ""

Code by Ted Weissgerber


See also



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