/// <summary>
/// Handles changes on the <see cref="NodeSortDescriptionsProperty"/> dependency property. As
/// WPF internally uses the dependency property system and bypasses the
/// <see cref="NodeSortDescriptions"/> property wrapper, updates should be handled here.
/// </summary>
/// <param name="d">The currently processed owner of the property.</param>
/// <param name="e">Provides information about the updated property.</param>
private static void NodeSortDescriptionsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//don't do anything if the control is being created
TreeViewBase <T> owner = (TreeViewBase <T>)d;
if (!owner.IsInitialized || owner.Tree == null)
{
return;
}
//set sort parameters on tree (root == null) or root node
owner.ApplySorting(owner.RootNode, null);
//iterate over all nodes and apply sorting
foreach (TreeViewItem item in owner.RecursiveNodeList)
{
owner.ApplySorting(item, (T)item.Header);
}
}
/// <summary>
/// Handles changes on the <see cref="RootNodeProperty"/> dependency property. As
/// WPF internally uses the dependency property system and bypasses the
/// <see cref="RootNode"/> property wrapper, updates should be handled here.
/// </summary>
/// <param name="d">The currently processed owner of the property.</param>
/// <param name="e">Provides information about the updated property.</param>
private static void RootNodePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//just recreate the tree - this takes care of everything
TreeViewBase <T> owner = (TreeViewBase <T>)d;
TreeViewItem newValue = (TreeViewItem)e.NewValue;
//don't do anything if the control is being created
if (!owner.IsInitialized)
{
return;
}
owner.Refresh(owner.GetTreeLayout());
//apply sorting on root or tree (if the new value is null)
owner.ApplySorting(newValue, null);
}