WPF TabControl 模拟动画

 using System;
 using System.Threading;
 using System.Windows;
 using System.Windows.Controls;
 using WangCai.Common;

 namespace WangCai.Controls
 {

     public class MyTabControl : TabControl
     {

         Timer t = null;
         private int left = ;
         private int AnimationIndex = ;
         protected override void OnSelectionChanged(SelectionChangedEventArgs e)
         {
             Action a = () =>
             {
                 try
                 {
                     AnimationIndex++;
                     var control = e.Source as MyTabControl;
                     if (control == null) return;
                     base.OnSelectionChanged(e);
                     if (AnimationIndex %  == )
                     {
                         left = -;
                     }
                     else
                     {
                         left = ;
                     }

                     var selectItem = control.SelectedContent as ScrollViewer;
                     if (selectItem == null)
                     {

                         var selectItem_2 = control.SelectedContent as Grid;
                         if (selectItem_2 == null)
                         {
                             var selectItem_3 = control.SelectedContent as StackPanel;
                             if (selectItem_3 == null) return;
                             selectItem_3.Visibility = Visibility.Collapsed;
                             t = new Timer(Move, selectItem_3, , );
                             return;
                         }
                         selectItem_2.Visibility = Visibility.Collapsed;
                         t = new Timer(Move, selectItem_2, , );
                         return;
                     }
                     selectItem.Visibility = Visibility.Collapsed;

                     t = new Timer(Move, selectItem, , );

                 }
                 catch (Exception)
                 {

                 }
             };
             this.Dispatcher.BeginInvoke(a);
         }

         public void Move(object o)
         {

             Action a = () =>
             {
                 try
                 {
                     if (AnimationIndex %  == )
                     {
                         left +=;
                         if (left > )
                         {
                             t.Dispose();

                             return;
                         }
                         AnimationIndex = ;
                     }
                     else
                     {

                         left -= ;

                         if (left <= )
                         {
                             t.Dispose();

                             return;
                         }
                         AnimationIndex = ;
                     }

                     var selectItem = o as ScrollViewer;
                     if (selectItem == null)
                     {
                         var selectItem_2 = o as Grid;
                         if (selectItem_2 == null)
                         {
                             var selectItem_3 = o as StackPanel;
                             if (selectItem_3 == null) return;
                             selectItem_3.Visibility = Visibility.Visible;
                             selectItem_3.Margin = new Thickness(left, , , );

                             return;
                         }
                         selectItem_2.Visibility = Visibility.Visible;
                         selectItem_2.Margin = new Thickness(left, , , );
                         return;
                     }
                     selectItem.Visibility = Visibility.Visible;
                     selectItem.Margin = new Thickness(left, , , );
                 }
                 catch (Exception)
                 {

                 }

             };
             this.Dispatcher.BeginInvoke(a);
         }

     }
 }