Tells the computer which function to call when the right mouse button is released. The value of handlerFunction must be a pointer to a function which takes no parameters. The function will be called every time the user releases the right mouse button until another call to onRightMouseUp.
If no parameter is given, the program stops calling the current right mouse button release handler function. No function will be called when the user releases the right mouse button until another call to onRightMouseUp tells it otherwise.
Note that only one handler for releasing the right mouse button can be used at any one time. A subsequent call to onRightMouseUp will replace the current handler function.
No return value.
Passing Functions as Variables
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