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50 lines
2 KiB
Plaintext
50 lines
2 KiB
Plaintext
The '''_BUTTONCHANGE''' function returns -1 or 1 when a specified button number on a controller device has been pressed or released.
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{{PageSyntax}}
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::: press = _BUTTONCHANGE(''button_number%'')
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* Values returned are -1 for a press and 1 when a button is released. No press or release event returns zero.
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* The ''button_number'' must be a number which does not exceed the number of buttons found by the [[_LASTBUTTON]] function.
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* '''The number of [[_DEVICES]] MUST be read before using [[_DEVICE$]], [[_DEVICEINPUT]] or [[_LASTBUTTON]]!'''
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* '''Note:''' The center mouse button is button number 2. Center can also be read using [[_MOUSEBUTTON]](3).
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''Example:'' Reading multiple controller device buttons, axis and wheels.
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{{CodeStart}} '' ''
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{{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} {{Cl|_DEVICES}}
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{{Cl|PRINT}} {{Cl|STR$}}(i) + ") " + {{Cl|_DEVICE$}}(i) + " Buttons:"; {{Cl|_LASTBUTTON}}(i); ",Axis:"; {{Cl|_LASTAXIS}}(i); ",Wheel:"; {{Cl|_LASTWHEEL}}(i)
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{{Cl|NEXT}}
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{{Cl|DO...LOOP|DO}}
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d& = {{Cl|_DEVICEINPUT}}
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{{Cl|IF...THEN|IF}} d& {{Cl|THEN}} ' the device number cannot be zero!
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{{Cl|PRINT}} "Found"; d&;
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{{Cl|FOR...NEXT|FOR}} b = 1 {{Cl|TO}} {{Cl|_LASTBUTTON}}(d&)
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{{Cl|PRINT}} {{Cl|_BUTTONCHANGE}}(b); {{Cl|_BUTTON}}(b);
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{{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} a = 1 {{Cl|TO}} {{Cl|_LASTAXIS}}(d&)
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{{Cl|PRINT}} {{Cl|_AXIS}}(a);
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{{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} w = 1 {{Cl|TO}} {{Cl|_LASTWHEEL}}(d&)
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{{Cl|PRINT}} {{Cl|_WHEEL}}(w);
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{{Cl|NEXT}}
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{{Cl|PRINT}}
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{{Cl|END IF}}
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27) 'escape key exit
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{{Cl|END}} '' ''
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{{CodeEnd}}
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: ''Note:'' When there is no device control to read, a [[FOR...NEXT|FOR]] n = 1 TO 0 loop will not run thus avoiding a control function read error.
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''See also:''
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* [[_LASTWHEEL]], [[_LASTBUTTON]], [[_LASTAXIS]]
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* [[_AXIS]], [[_WHEEL]], [[_BUTTON]]
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* [[_DEVICE$]], [[_DEVICES]]
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* [[_MOUSEBUTTON]]
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* [[Controller Devices]]
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{{PageNavigation}} |