Method updateOffsetFromParent

src/index.tsx:552–573

()

  }

  updateOffsetFromParent() {
    const scale = this.props.scale as number;
    const parent = this.getParent();
    const self = this.getSelfElement();
    if (!parent || self === null) {
      return {
        top: 0,
        left: 0,
      };
    }
    const parentRect = parent.getBoundingClientRect();
    const parentLeft = parentRect.left;
    const parentTop = parentRect.top;
    const selfRect = self.getBoundingClientRect();
    const position = this.getDraggablePosition();
    const scrollLeft = parent.scrollLeft;
    const scrollTop = parent.scrollTop;
    this.offsetFromParent = {
      left: selfRect.left - parentLeft + scrollLeft - position.x * scale,
      top: selfRect.top - parentTop + scrollTop - position.y * scale,
    };
  }

  render() {
    const {