5-WPFTemplates-And-CustomElements/5-17.1理解逻辑树和可视化树/VisualTreeDisplayWindow.xaml.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace _5_WPF模板和自定义元素;

public partial class VisualTreeDisplayWindow : Window
{
    public VisualTreeDisplayWindow()
    {
        InitializeComponent();
    }

    public void ShowVisualTree(DependencyObject element)
    {
        // 清除树
        TreeViewElement.Items.Clear();

        // 递归添加元素及其子元素
        ProcessElement(element, null);
    }

    private void ProcessElement(DependencyObject element, TreeViewItem? previousItem)
    {
        var item = new TreeViewItem
        {
            Header = element.GetType().Name,
            IsExpanded = true
        };

        // 检查跟节点，如果不为空添加子节点
        if (previousItem == null)
            TreeViewElement.Items.Add(item);
        else
            previousItem.Items.Add(item);

        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            ProcessElement(VisualTreeHelper.GetChild(element, i), item);
    }
}