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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Media;
namespace MaterialDesignThemes.Wpf
{
internal static class Extensions
{
public static IEnumerable<DependencyObject> VisualDepthFirstTraversal(this DependencyObject node)
{
if (node == null) throw new ArgumentNullException(nameof(node));
yield return node;
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(node); i++)
{
var child = VisualTreeHelper.GetChild(node, i);
foreach (var descendant in child.VisualDepthFirstTraversal())
{
yield return descendant;
}
}
}
public static IEnumerable<DependencyObject> VisualBreadthFirstTraversal(this DependencyObject node)
{
if (node == null) throw new ArgumentNullException(nameof(node));
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(node); i++)
{
var child = VisualTreeHelper.GetChild(node, i);
yield return child;
}
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(node); i++)
{
var child = VisualTreeHelper.GetChild(node, i);
foreach (var descendant in child.VisualDepthFirstTraversal())
{
yield return descendant;
}
}
}
public static bool IsAncestorOf(this DependencyObject parent, DependencyObject node)
{
return node != null && parent.VisualDepthFirstTraversal().Contains(node);
}
/// <summary>
/// Returns full visual ancestry, starting at the leaf.
/// </summary>
/// <param name="leaf"></param>
/// <returns></returns>
public static IEnumerable<DependencyObject> GetVisualAncestry(this DependencyObject leaf)
{
while (leaf != null)
{
yield return leaf;
leaf = VisualTreeHelper.GetParent(leaf);
}
}
public static IEnumerable<DependencyObject> GetLogicalAncestry(this DependencyObject leaf)
{
while (leaf != null)
{
yield return leaf;
leaf = LogicalTreeHelper.GetParent(leaf);
}
}
public static bool IsDescendantOf(this DependencyObject leaf, DependencyObject ancestor)
{
DependencyObject parent = null;
foreach (var node in leaf.GetVisualAncestry())
{
if (Equals(node, ancestor))
return true;
parent = node;
}
return parent.GetLogicalAncestry().Contains(ancestor);
}
}
}
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