_MOUSEINPUT - mkilgore/QB64pe GitHub Wiki
The _MOUSEINPUT function is used to monitor any new mouse positions, button presses or movements of the scroll wheel. Must be called before other mouse information becomes available.
- infoExists%% = _MOUSEINPUT
- Returns -1 if new mouse information is available, otherwise it returns 0.
- Must be called before reading any of the other mouse functions. The function will not miss any mouse input even during an INPUT entry.
- Use in a loop to monitor the mouse buttons, scroll wheel and coordinate positions.
- To clear all previous mouse data, use _MOUSEINPUT in a loop until it returns 0.
Example 1: Mouse coordinate, click and scroll events are returned sequentially inside of a _MOUSEINPUT loop.
'' '' DO DO...LOOP WHILE _MOUSEINPUT ' Check the mouse status PRINT _MOUSEX, _MOUSEY, _MOUSEBUTTON(1), _MOUSEWHEEL LOOP LOOP UNTIL INKEY$ <> "" '' '' |
- Explanation: The latest mouse function status can be read after the loop. _LIMIT and _DELAY loops will slow returns down.
DO...LOOP ' main program loop ' your program code DO...LOOP WHILE _MOUSEINPUT'mouse status changes only x = _MOUSEX y = _MOUSEY IF...THEN x > 0 AND (boolean) x < 640 AND (boolean) y > 0 AND (boolean) y < 480 THEN IF...THEN _MOUSEBUTTON(2) THEN PSET (x, y), 15 LOCATE 1, 1: PRINT x, y END IF END IF LOOP ' your program code LOOP UNTIL INKEY$ = CHR$(27) '' '' |
Example 3: Clearing any mouse data read before or during an INPUT entry. Press "I" to enter input:
PRINT "Press I to enter input! Press Q to quit" DO...LOOP K$ = UCASE$(INKEY$) DO...LOOP IF...THEN _MOUSEBUTTON(1) = -1 THEN PRINT "*" 'indicates a mouse click event LOOP WHILE _MOUSEINPUT IF...THEN K$ = "Q" THEN END IF...THEN K$ = "I" THEN 'press I to enter text INPUT "Click the mouse and enter something: ", entry$ 'enter some text GOSUB Clickcheck 'clear mouse data END IF LOOP END Clickcheck: count = 0 DO...LOOP count = count + 1 LOOP WHILE _MOUSEINPUT PRINT count 'returns the number of loops before mouse data is cleared RETURN '' '' |
- Explanation: Click the mouse a few times while entering INPUT text. When Enter is pressed, the number of loops are displayed.
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