using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace Txgy.EWS.Client.Common.Helpers
{
    public class VisualHost : Canvas
    {
        public List<Visual> visuals = new List<Visual>();

        //获取Visual的个数
        protected override int VisualChildrenCount
        {
            get { return visuals.Count; }
        }

        //获取Visual
        protected override Visual GetVisualChild(int index)
        {
            return visuals[index];
        }

        //添加Visual
        public void AddVisual(Visual visual)
        {
            visuals.Add(visual);

            Application.Current.Dispatcher.Invoke(() => base.AddVisualChild(visual));
            Application.Current.Dispatcher.Invoke(() => base.AddLogicalChild(visual));
        }

        //删除Visual
        public void RemoveVisual(Visual visual)
        {
            visuals.Remove(visual);

            Application.Current.Dispatcher.Invoke(()=>base.RemoveVisualChild(visual));
            Application.Current.Dispatcher.Invoke(() => base.RemoveLogicalChild(visual));
        }

        //命中测试
        public DrawingVisual GetVisual(Point point)
        {
            HitTestResult hitResult = VisualTreeHelper.HitTest(this, point);
            return hitResult.VisualHit as DrawingVisual;
        }
    }
}