Wino-Mail/Wino.Mail.WinUI/Helpers/WinoVisualTreeHelper.cs

using System.Collections.Generic;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Media;

namespace Wino.Helpers;

public static class WinoVisualTreeHelper
{
    public static T? GetChildObject<T>(DependencyObject? obj, string name) where T : FrameworkElement
    {
        if (obj == null) return null;

        DependencyObject? child = null;
        T? grandChild = null;

        for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
        {
            child = VisualTreeHelper.GetChild(obj, i);

            if (child is T typedChild && (typedChild.Name == name || string.IsNullOrEmpty(name)))
            {
                return typedChild;
            }
            else
            {
                grandChild = GetChildObject<T>(child, name);
            }
            if (grandChild != null)
            {
                return grandChild;
            }
        }
        return null;
    }

    public static IEnumerable<T> FindDescendants<T>(this DependencyObject? depObj) where T : DependencyObject
    {
        if (depObj != null)
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                var child = VisualTreeHelper.GetChild(depObj, i);
                if (child != null && child is T)
                {
                    yield return (T)child;
                }

                foreach (T childOfChild in FindDescendants<T>(child))
                {
                    yield return childOfChild;
                }
            }
        }
    }
}