Method handleChange

packages/react-dnd/src/DragLayer.js:97–106

()

      }

      handleChange() {
        if (!this.isCurrentlyMounted) {
          return;
        }

        const nextState = this.getCurrentState();
        if (!shallowEqual(nextState, this.state)) {
          this.setState(nextState);
        }
      }

      getCurrentState() {
        const monitor = this.manager.getMonitor();