Views/DrawingCanvas.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace MahAppsMetro.Demo.Views
{
    public class DrawingCanvas:Canvas
    {
        private List<Visual> visuals = new List<Visual>();

        protected override int VisualChildrenCount => visuals.Count;

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

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

            base.AddVisualChild(visual);
            base.AddLogicalChild(visual);
        }

        public void RemoveVisual(Visual visual)
        {
            visuals.Remove(visual);
            base.RemoveVisualChild(visual);
            base.RemoveLogicalChild(visual);
        }

        public void RemoveVisual(int index)
        {
            RemoveVisual(visuals[index]);
        }

        public bool HadLoaded { get; set; }

        public DrawingCanvas()
        {
            this.Loaded += DrawingCanvas_Loaded;
        }

        private void DrawingCanvas_Loaded(object sender, System.Windows.RoutedEventArgs e)
        {
            if (HadLoaded)
                AddVisuals();
            this.HadLoaded = true;
        }


        public bool HadAdded { get; set; }
        private void AddVisuals()
        {