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
var pathToSelected = new List <TNode>();
BuildPathToSelected(this.RootNodes, pathToSelected);
//if (pathToSelected.Count > 0) pathToSelected.RemoveAt(0); // don't expand the selected node
foreach (var pathNode in pathToSelected)
{
if (this.IsNodeExpanded(pathNode) == false)
{
this._expandedNodes[pathNode] = true;
await ExpandStateChanged.InvokeAsync(new ExpandedStateChangedArgs <TNode>(pathNode, true));
}
}
await base.OnParametersSetAsync();
}
internal async Task SetExpandedNodeAsync(TNode node, bool expanded)
{
this._expandedNodes[node] = expanded;
await ExpandStateChanged.InvokeAsync(new ExpandedStateChangedArgs <TNode>(node, expanded));
await EnsureSelectedNodeIsVisible();
StateHasChanged();
}
/// <summary>
/// Default ctor
/// </summary>
public EntityTreeView()
{
SelectionManager = new SelectionManager();
treeView = new TreeViewX {
Dock = DockStyle.Fill, HideSelection = false
};
Controls.Add(treeView);
treeView.AfterExpand += (s, x) => ExpandStateChanged.Fire(this);
treeView.AfterCollapse += (s, x) => ExpandStateChanged.Fire(this);
treeView.AfterSelect += OnTreeViewAfterSelect;
treeView.ContextMenuStrip = contextMenuStrip;
}
