how to create edge on custom IView

[wss29]

hi,

1. I use a custom JSON model just like the node-json-theia demo in glsp-exapmles 2.0. I want to create a connection between my nodes

2. I create a custom IView for my node
   

3. other core code is as follows
   

4. the problem is the cursor is not clickable when moving over the node view, which means it can not create a connection. how is the logic to check whether can click on node view?
   

[wss29]

I omit one place, need set sourceElementTypeIds and targetElementTypeIds in edgeTypeHints method. it works now.