wpf listbox实现选中动画

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效果如下：
在这里插入图片描述
参考：https://github.com/WPFDevelopersOrg/WPFDevelopers/blob/master/src/WPFDevelopers.Samples.Shared/Controls/NavigateMenu/NavigateMenu.xaml
实现上述效果的前台代码：

<Windowx:Class="ListBox.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:ListBox"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"Title="MainWindow"Width="800"Height="450"mc:Ignorable="d"><Grid><Grid.ColumnDefinitions><ColumnDefinition /></Grid.ColumnDefinitions><ListBox x:Name="listbox"><ListBoxItem>1</ListBoxItem><ListBoxItem>2</ListBoxItem><ListBoxItem>3</ListBoxItem><ListBoxItem>4</ListBoxItem><ListBoxItem>5</ListBoxItem></ListBox><Rectanglex:Name="rect"Width="2"Height="20"HorizontalAlignment="Left"VerticalAlignment="Top"Fill="Red"></Rectangle></Grid>
</Window>

后台代码：

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.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;namespace ListBox
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();this.listbox.SelectionChanged += Listbox_SelectionChanged;}private double? lastX = null;private double? lastY = null;private void Listbox_SelectionChanged(object sender, SelectionChangedEventArgs e){var itemTo = e.AddedItems[0] as ListBoxItem;var pointTo = itemTo.TranslatePoint(new Point(0, 0), this);var toMargin = new Thickness(pointTo.X, pointTo.Y, 0, 0);ThicknessAnimation ani = new ThicknessAnimation();ani.To = toMargin;ani.Duration = TimeSpan.FromSeconds(0.3);this.rect.BeginAnimation(Rectangle.MarginProperty, ani);ani.Completed += (ss, ee) =>{this.rect.Margin = toMargin;};}}
}