protected override async Task OnParametersSetAsync()
{
if (_rootNodes == null)
{
throw new ArgumentException($"One of the following must be supplied {nameof(RootNode)} or {nameof(RootNodes)} (but NOT BOTH)");
}
if (NodeTemplate == null)
{
throw new ArgumentException($"The parameter {nameof(NodeTemplate)} has not been set");
}
if (GetChildNodesCallback == null)
{
throw new ArgumentException($"The parameter {nameof(GetChildNodesCallback)} has not been set");
}
// ensure everything is expanded up to the selected node
List <TNode> pathToSelected = new List <TNode>();
BuildPathToSelected(this.RootNodes, pathToSelected);
//if (pathToSelected.Count > 0) pathToSelected.RemoveAt(0); // don't expand the selected node
foreach (TNode pathNode in pathToSelected)
{
if (this.IsNodeExpanded(pathNode) == false)
{
this.ExpandedNodes.Add(pathNode);
await ExpandedNodesChanged.InvokeAsync(new ExpandedNodesChangedArgs <TNode>(this.ExpandedNodes, pathNode, true));
}
}
await base.OnParametersSetAsync();
}
private void OnToggleNode(TNode node, bool expand)
{
bool expanded = ExpandedNodes.Contains(node);
if (expanded && !expand)
{
ExpandedNodes.Remove(node);
ExpandedNodesChanged.InvokeAsync(ExpandedNodes);
}
else if (!expanded && expand)
{
ExpandedNodes.Add(node);
ExpandedNodesChanged.InvokeAsync(ExpandedNodes);
}
}
internal async Task SetExpandedNodesAsync(TNode node, bool expanded)
{
if (expanded)
{
this.ExpandedNodes.Add(node);
}
else
{
this.ExpandedNodes.Remove(node);
}
await ExpandedNodesChanged.InvokeAsync(new ExpandedNodesChangedArgs <TNode>(this.ExpandedNodes, node, expanded));
await EnsureSelectedNodeIsVisible();
StateHasChanged();
}