Same key is being used by multiple widgets in GraphView.dart

[VikasJilla]

Hi,

I have observed that in GraphView.dart, when we pass a key to GraphView, you are passing it to both super constructor, as well as the widget being returned in build method. I think this should not be done. Because of this we are getting an issue as below:

The following assertion was thrown while finalizing the widget tree:
Multiple widgets used the same GlobalKey.
The key [LabeledGlobalKey<State<GraphView>>#f63ba] was used by multiple widgets. The parents of those widgets were:
- GraphView-[LabeledGlobalKey<State<GraphView>>#f63ba](state: _GraphViewState#22b82)
- KeyedSubtree-[GlobalKey#0985f]
A GlobalKey can only be specified on one widget at a time in the widget tree.
When the exception was thrown, this was the stack:
#0      BuildOwner._debugVerifyGlobalKeyReservation.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:flutter/src/widgets/framework.dart:2868:13)
#1      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:614:13)

Please resolve this as soon as possible. Please let me know if there is something I missed.

[nabil6391]

Hi, By any chance do you haev any example code that I can look into. Like for example whats the keys you are using. You do have to ensure that there are no duplicate keys for the nodes

[VikasJilla]

@nabil6391 below is the sample code that was leading to the error.

final GlobalKey _graphViewKey = GlobalKey<State<GraphView>>();
 GraphView(
        key: _graphViewKey,
        graph: graph,
        algorithm: walkerAlgorithm!,
        animated: true,
        paint: Paint()
          ..color = AppColors.relationsGreyColor
          ..strokeWidth = 1
          ..style = PaintingStyle.stroke,
        builder: (Node node) {
          return buildNode(node);
        },
      )