wpf实现展开收缩效果（ShrinkSpread）

仿QQ展开收缩效果

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;

namespace ShrinkSpread
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        323  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\App.xaml

     文件        308  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\App.xaml.cs

     文件      11264  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\bin\Debug\ShrinkSpread.exe

     文件      26112  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\bin\Debug\ShrinkSpread.pdb

     文件      24216  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\bin\Debug\ShrinkSpread.vshost.exe

     文件        490  2013-06-18 20:28  ShrinkSpread\ShrinkSpread\bin\Debug\ShrinkSpread.vshost.exe.manifest

     文件       2681  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\MainWindow.xaml

     文件       1297  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\MainWindow.xaml.cs

     文件       2316  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\App.g.cs

     文件       2316  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\App.g.i.cs

     文件       7009  2014-11-23 12:34  ShrinkSpread\ShrinkSpread\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       2590  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\MainWindow.baml

     文件       3788  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\MainWindow.g.cs

     文件       3788  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\MainWindow.g.i.cs

     文件       1324  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.csproj.FileListAbsolute.txt

     文件        919  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.csproj.GenerateResource.Cache

     文件       2354  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.csprojResolveAssemblyReference.cache

     文件      11264  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.exe

     文件       2818  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.g.resources

     文件      26112  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.pdb

     文件        180  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread.Properties.Resources.resources

     文件        320  2014-11-23 12:35  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread_MarkupCompile.cache

     文件        319  2014-11-23 12:34  ShrinkSpread\ShrinkSpread\obj\Debug\ShrinkSpread_MarkupCompile.i.cache

     文件       2187  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\Properties\AssemblyInfo.cs

     文件       2876  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\Properties\Resources.Designer.cs

     文件       5612  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\Properties\Resources.resx

     文件       1099  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\Properties\Settings.Designer.cs

     文件        201  2014-11-23 12:31  ShrinkSpread\ShrinkSpread\Properties\Settings.settings

     文件       4356  2014-11-23 12:32  ShrinkSpread\ShrinkSpread\ShrinkSpread.csproj

     文件       1005  2014-11-23 12:32  ShrinkSpread\ShrinkSpread.sln

............此处省略12个文件信息