Question: Is there a way to deactivate "toggleExpansion" ?

[DasTobbel]

Hi,
i'm looking for a way to, based on the item, to deactivate the expansion/collapse of its children.
Is there a way currently ?

Or is it something you want to achieve?
If yes, my suggestion would be something like, i could do the PR:

  Future<void> toggleExpansion(ITreeNode<Data> item) async {
    if (item.isExpandable == false) {
      return;
    }
    if (item.isExpanded)
      await collapseNode(item);
    else {
      expandNode(item);
      await applyExpansionBehavior(item);
    }
  }

Greets!

[jawwad-hassan89]

Logically speaking, if a node has children then it should be expandable, otherwise, it shouldn't have any children. So, I would rather not have this functionality, but you are free to create your own fork for this change set.

[DasTobbel]

Ah, let me rephrase it:
I want to forbid the collapsing of node+children as i click on the node.

Currently if i use the treeview and the node has children, the "onItemTap" function will collapse/expand the clicked node while executing the "onItemTap" function.

Probably something like this, while adding the default "node.mayCollapse = true"?

  Future<void> toggleExpansion(ITreeNode<Data> item) async {
   if (item.isExpanded && item.children.isNotEmpty && item.mayCollapse == false) {
      return;
    }
    else if (item.isExpanded &&  item.mayCollapse)
      await collapseNode(item);
    else {
      expandNode(item);
      await applyExpansionBehavior(item);
    }
  }