fuchunhui commented on issue #16169:
URL: https://github.com/apache/echarts/issues/16169#issuecomment-1069109675


   I sort out all opinions.
   
   1. add `nodeClick` option with values of false | 'expand' | 'link' similar 
to [treemap 
series](https://echarts.apache.org/en/option.html#series-treemap.nodeClick).
   2. use `collapsible / expandable` controls 'the state of node expand'.
   3. deprecate `expandAndCollapse` & cover the bottom😆 & warning.
   
   am I?
   
   like to be this
   
   ```
   {
       nodeClick: false // false | 'expand' | 'link'
       expandable: true // boolean
   }
   ```
   
   Case 1
   ```
   nodeClick: false
   ```
   when clicking node, chart do nothing, no event, no expand.
   
   Case 2
   ```
   nodeClick: 'expand'
   expandable: true
   ```
   chart dispatch action 'treeExpandAndCollapse', toggle `node.isExpand`
   
   Case 3
   ```
   nodeClick: 'expand'
   expandable: false
   ```
   only dispatch action `treeExpandAndCollapse`, no toggle.
   
   Case 4
   ```
   nodeClick: 'link'
   ```
   link to url,  ignore `expandable`.
   
   Finally, how to control initialization? 
   
   ```
   const expandAndCollapse = option.expandAndCollapse;
   const expandTreeDepth = (expandAndCollapse && option.initialTreeDepth >= 0)
       ? option.initialTreeDepth
       : treeDepth;
   ```
   remove expandAndCollapse, decide by `initialTreeDepth >= 0` only.


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