block4.js

<PanGestureHandler
  maxPointers={1}
  onGestureEvent={this.onGestureEvent}
  onHandlerStateChange={this.onGestureEvent}
>
  <Animated.View
    style={[
      styles.box,
      {
        transform: [
          {
            translateX: this.transX,
          },
          {
            translateY: this.transY,
          },
        ],
      },
    ]}
  />
</PanGestureHandler>