protected void SetTreeItemParent(EqTreeItem treeItem, string newParentKey, string currentParentkey = null)
{
if (currentParentkey == newParentKey)
{
return; //Don't anything if the parent has not changed.
}
//Delink the existing parent
DelinkTreeItemFromParent(treeItem);
treeItem.ParentKey = newParentKey;
if (newParentKey == null)
{
return; //The item is being moved to root.
}
var parent = FindTreeItem(newParentKey);
if (parent == null)
{
throw new ApplicationException($"The {ParentKeyPropertyName} : {newParentKey} does not refer to a valid item and could not be set as a parent for item {treeItem.Label}");
}
treeItem.AddParent(parent);
treeItem.Parent.AddChild(treeItem);
}
protected static void DelinkTreeItemFromParent(EqTreeItem treeItem)
{
if (!treeItem.IsRootNode)
{
treeItem.Parent?.Children?.Remove(treeItem);
treeItem.Parent = null;
}
}
protected async Task ItemSelected(EqTreeItem selectedItem)
{
SetSelectedTreeItem(selectedItem);
var originalObject = FindObjectFromDatasource(selectedItem);
await OnItemSelected.InvokeAsync(originalObject);
}
public void AddChild(EqTreeItem child)
{
if (Children == null)
{
Children = new List <EqTreeItem>();
}
Children.Add(child);
child.Level = this.Level + 1;
}
protected void ShowTreeItem(EqTreeItem eqTreeItem)
{
if (eqTreeItem == null)
{
return;
}
eqTreeItem.IsExpanded = true;
eqTreeItem.IsVisible = true;
ShowTreeItem(eqTreeItem.Parent);
}
protected void SetSelectedTreeItem(EqTreeItem newSelectedItem)
{
if (_selectedItem != null)
{
_selectedItem.IsSelected = false; //Notify the previously selected item that it has been deselected.
}
_selectedItem = newSelectedItem;
if (_selectedItem != null)
{
_selectedItem.IsSelected = true;
}
}
protected List <EqTreeItem> TraverseChildren(EqTreeItem item, List <EqTreeItem> childrenList)
{
if (item.HasChildren)
{
foreach (var child in item.Children)
{
TraverseChildren(child, childrenList);
}
}
childrenList.Add(item);
return(childrenList);
}
protected TValue FindObjectFromDatasource(EqTreeItem treeItem)
{
if (treeItem == null)
{
return(default(TValue));
}
foreach (var item in Datasource)
{
if (treeItem.Key == item.GetPropValue(KeyPropertyName)?.ToString())
{
return(item);
}
}
return(default(TValue));
}
protected void AddChildren(EqTreeItem treeItem, IEnumerable <EqTreeItem> treeItems)
{
//Find all this nodes children
var nodeChildren = treeItems.Where(c => c.ParentKey == treeItem.Key).ToList();
//If node exit
if (nodeChildren.Count == 0)
{
return;
}
//Add the children.
foreach (var child in nodeChildren)
{
child.Parent = treeItem;
treeItem.AddChild(child);
//Call each child to add their children
AddChildren(child, treeItems);
}
}
public void AddParent(EqTreeItem parent)
{
Parent = parent;
Level++;
IncrementChildrenLevel();
}
protected List <EqTreeItem> FindAllTreeItemChildren(EqTreeItem item)
{
var childrenList = new List <EqTreeItem>();
return(TraverseChildren(item, childrenList));
}