How do you get the node in the treeview that is being clicked

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Hello, I am currently implementing a file treeview plugin. But now I ask is that if I put a file button in the (location: view/title, group: navigation) there, don't know how to get the current treeview selected node, in fact just like vscode documents to open the device itself, Is to get the current click on the button, the default is in the root directory of the open document, when the selected node, select the node area generated. I looked at the API and there was no API for it,

[vscodenpa]

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