/// <summary>
/// Adds an item to the tree.
/// </summary>
protected virtual TreeItemViewModel AddNode(TreeItemViewModel parent, object item, string text, string icon)
{
// create node.
TreeItemViewModel treeNode = new TreeItemViewModel(NodesTV, parent);
// update text/icon.
UpdateNode(treeNode, item, text, icon);
// add to control.
if (parent == null)
{
NodesTV.TreeItems?.Add(treeNode);
}
else
{
parent.Children.Add(treeNode);
}
// return new tree node.
return(treeNode);
}
/// <summary>
/// Updates a tree node with the current contents of an object.
/// </summary>
protected virtual void UpdateNode(TreeItemViewModel treeNode, object item, string text, string icon)
{
treeNode.Text = text;
treeNode.Item = item;
treeNode.Icon = icon;
switch (icon)
{
case "Server":
treeNode.Brush = new SolidColorBrush(Colors.Green);
break;
case "ServerStopped":
treeNode.Brush = new SolidColorBrush(Colors.Red);
break;
case "ServerKeepAliveStopped":
treeNode.Brush = new SolidColorBrush(Colors.Yellow);
break;
default:
treeNode.Brush = null;
break;
}
}
/// <summary>
/// Initializes a node before expanding it.
/// </summary>
protected virtual Task BeforeExpand(TreeItemViewModel clickedNode)
{
return(Task.CompletedTask);
}
/// <summary>
/// Enables the state of menu items.
/// </summary>
protected virtual void EnableMenuItems(TreeItemViewModel clickedNode)
{
// do nothing.
}
/// <summary>
/// Returns the data to drag.
/// </summary>
protected virtual object GetDataToDrag(TreeItemViewModel node)
{
return(node.Item);
}
/// <summary>
/// Adds an item to the tree.
/// </summary>
protected virtual TreeItemViewModel AddNode(TreeItemViewModel treeNode, object item)
{
return(AddNode(treeNode, item, String.Format("{0}", item), "ClosedFolder"));
}