How can I get the node content at specific position

[guoz2013]

When I click on the editor, how do I get the specific node content of the click location, I know I can queryNote by offset, but what I get is a Line, and it might have multiple nodes, but I want a specific node,
Thank you

[singerdmx]

[guoz2013]

I tried this method, but it causes Stack Overflow when executed, could this be a bug ?

QuillEditor(
controller: qc,
readOnly: false,
focusNode: FocusNode(),
showCursor: true,
scrollController: ScrollController(),
scrollable: true,
padding: const EdgeInsets.all(10),
autoFocus: true,
expands: false,
placeholder: "",
minHeight: 60,
onTapUp: (detail, fn) {
int gestureOffset = fn(detail.localPosition).offset;
var leafNode = qc.document.querySegmentLeafNode(gestureOffset);
print(leafNode);
return false;
},
)

[singerdmx]

You need to debug it yourself. This is all the help I can do.