@Override
    public void setCursorVisible(boolean visible) {
        if (!inited)
            throw new IllegalStateException("Input not initialized.");
    }
DummyMouseInput as an implementation of <code>MouseInput</code> that raises no
input events.

@author Kirill Vainer.
jme3-core/src/main/java/com/jme3/input/dummy/DummyMouseInput.java