[Feature] (Tree In the tree diagram, how do I obtain the positions offsetX and offsetY offset by node A when I click node A) Tree树图，点开A节点时，如何获取到A偏移后的位置offsetX和offsetY

[BWA-579]

What problem does this feature solve?

Tree 点开节点，被点的节点会自适应偏移一段距离，要使点击的节点做居中，单获取click事件的x和y不够准确，得获取偏移后的位置。

What does the proposed API look like?

希望能有个后after事件，或者有什么方案能解决当前问题。

[BWA-579]

https://echarts.apache.org/examples/zh/editor.html?c=tree-basic 偏移示例