OnGestureListener

RotaryKnobView.kt

    override fun onScroll(e1: MotionEvent, e2: MotionEvent, distanceX: Float, distanceY: Float)
            : Boolean {
        return true
    }

    override fun onTouchEvent(event: MotionEvent): Boolean {
        return if (gestureDetector.onTouchEvent(event))
            true
        else
            super.onTouchEvent(event)
    }

    override fun onDown(event: MotionEvent): Boolean {
        return true
    }

    override fun onSingleTapUp(e: MotionEvent): Boolean {
        return false
    }

    override fun onFling(arg0: MotionEvent, arg1: MotionEvent, arg2: Float, arg3: Float)
            : Boolean {
        return false
    }

    override fun onLongPress(e: MotionEvent) {}

    override fun onShowPress(e: MotionEvent) {}