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);
        }

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Utility
{
    public class FormShowHideFx
    {
        #region 变量
        #region dwflag的取值
        private const Int32 AW_HOR_POSITIVE = 0x00000001;
        //从左到右显示
        private const Int32 AW_HOR_NEGATIVE = 0x00000002;
        //从右到左显示
        private const Int32 AW_VER_POSITIVE = 0x00000004;
        //从上到下显示
        private const Int32 AW_VER_NEGATIVE = 0x00000008;
        //从下到上显示
        private const Int32 AW_CENTER = 0x00000010;
        //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
        private const Int32 AW_HIDE = 0x00010000;
        //隐藏窗口，缺省则显示窗口
        private const Int32 AW_ACTIVATE = 0x00020000;
        //激活窗口。在使用了AW_HIDE标志后不能使用这个标志
        private const Int32 AW_SLIDE = 0x00040000;
        //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
        private const Int32 AW_BLEND = 0x00080000;
        #endregion
        #endregion

        #region 私有方法
        [DllImport("user32")]
        private static extern bool AnimateWindow(IntPtr whnd, int dwtime, int dwflag);
        #endregion

        #region 公开方法
        /// <summary>
        /// 由中心向边界扩展渐进打开窗口
        /// </summary>
        public static void ShowFXCenter(IntPtr wnd, int dwtime)
        {
            AnimateWindow(wnd, dwtime, AW_CENTER | AW_ACTIVATE | AW_SLIDE);
        }

        /// <summary>
        /// 由边界向中心扩展渐进关闭窗口
        /// </summary>
        public static void HideFXCenter(IntPtr wnd, int dwtime)
        {
            AnimateWindow(wnd, dwtime, AW_CENTER | AW_HIDE | AW_SLIDE);
        }
        #endregion

    }
}