Winform窗口渐进打开关闭效果实现

Winform窗口渐进打开关闭效果实现
     在Load中调用ShowFXCenter函数，在FormClosing中调用HideFXCenter函数：
        private void Form_Load(object sender, EventArgs e)
        {
            FormShowHideFx.ShowFXCenter(this.Handle, 300);
        }

        private void Form_FormClosing(object sender, FormClosingEventArgs e)
        {
            FormShowHideFx.HideFXCenter(this.Handle, 300);
        }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Text;
 4 using System.Runtime.InteropServices;
 5 
 6 namespace Helper
 7 {
 8     /// <summary>
 9     /// 窗口渐时显示隐藏
10     /// </summary>
11     public class FormShowHideFx
12     {
13         #region 变量
14         #region dwflag的取值
15         private const Int32 AW_HOR_POSITIVE = 0x00000001;
16         //从左到右显示
17         private const Int32 AW_HOR_NEGATIVE = 0x00000002;
18         //从右到左显示
19         private const Int32 AW_VER_POSITIVE = 0x00000004;
20         //从上到下显示
21         private const Int32 AW_VER_NEGATIVE = 0x00000008;
22         //从下到上显示
23         private const Int32 AW_CENTER = 0x00000010;
24         //若使用了AW_HIDE标志，则使窗口向内重叠，即收缩窗口；否则使窗口向外扩展，即展开窗口
25         private const Int32 AW_HIDE = 0x00010000;
26         //隐藏窗口，缺省则显示窗口
27         private const Int32 AW_ACTIVATE = 0x00020000;
28         //激活窗口。在使用了AW_HIDE标志后不能使用这个标志
29         private const Int32 AW_SLIDE = 0x00040000;
30         //使用滑动类型。缺省则为滚动动画类型。当使用AW_CENTER标志时，这个标志就被忽略
31         private const Int32 AW_BLEND = 0x00080000;
32         #endregion
33         #endregion
34 
35         #region 私有方法
36         [DllImport("user32")]
37         private static extern bool AnimateWindow(IntPtr whnd, int dwtime, int dwflag);
38         #endregion
39 
40         #region 公开方法
41         /// <summary>
42         /// 由中心向边界扩展渐进打开窗口
43         /// </summary>
44         public static void ShowFXCenter(IntPtr wnd, int dwtime)
45         {
46             AnimateWindow(wnd, dwtime, AW_CENTER | AW_ACTIVATE | AW_SLIDE);
47         }
48 
49         /// <summary>
50         /// 由边界向中心扩展渐进关闭窗口
51         /// </summary>
52         public static void HideFXCenter(IntPtr wnd, int dwtime)
53         {
54             AnimateWindow(wnd, dwtime, AW_CENTER | AW_HIDE | AW_SLIDE);
55         }
56         #endregion
57     }
58 }
59