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

namespace System.Windows.Forms
{
    public static class WpfHelper
    {
        public static T FindAncestor<T>(DependencyObject obj) where T : class
        {
            var parent = VisualTreeHelper.GetParent(obj);
            if (parent == null)
                return null;
            if (parent is T)
                return parent as T;
            return FindAncestor<T>(parent);
        }

        public static T FindParent<T>(FrameworkElement obj) where T : class
        {
            var parent = obj.Parent as FrameworkElement;
            if (parent == null)
                return null;
            if (parent is T)
                return parent as T;
            return FindParent<T>(parent);
        }

        public static T GetChildOfType<T>(this DependencyObject depObj) where T : DependencyObject
        {
            if (depObj == null) 
                return null;

            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                var child = VisualTreeHelper.GetChild(depObj, i);
                var result = (child as T) ?? GetChildOfType<T>(child);
                if (result != null) 
                    return result;
            }
            return null;
        }

        public static Rect BoundsRelativeTo(this FrameworkElement child, Visual parent)
        {
            var gt = child.TransformToAncestor(parent);
            return gt.TransformBounds(new Rect(0, 0, child.ActualWidth, child.ActualHeight));
        }
    }
}