winform动画效果

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        [DllImportAttribute("user32.dll")]

        // IntPtr hwnd: 目标窗口的句柄对象, 一般为 this.Handle
        // int dwTime: 动画的持续时间, 数值越大动画效果的时间越长
        // int dwFlags: 动画效果类型选项
        private static extern bool AnimateWindow(IntPtr hwnd, int dwTime, int dwFlags);

        /// <summary>
        /// AW_HOR_POSITIVE : 自左向右显示窗口
        /// </summary>
        public const Int32 AW_HOR_POSITIVE = 0x00000001;

        /// <summary>
        /// AW_HOR_NEGATIVE: 自右向左显示窗口
        /// </summary>
        public const Int32 AW_HOR_NEGATIVE = 0x00000002;

        /// <summary>
        /// AW_VER_POSITVE: 自顶向下显示窗口
        /// </summary>
        public const Int32 AW_VER_POSITIVE = 0x00000004;

        /// <summary>
        /// AW_VER_NEGATIVE : 自下向上显示窗口
        /// </summary>
        public const Int32 AW_VER_NEGATIVE = 0x00000008;

        /// <summary>
        /// AW_CENTER: 与 AW_HIDE 效果配合使用则效果为窗口几内重叠, 单独使用窗口向外扩展.
        /// </summary>
        public const Int32 AW_CENTER = 0x00000010;

        /// <summary>
        /// AW_HIDE: 隐藏窗口
        /// </summary>
        public const Int32 AW_HIDE = 0x00010000;

        /// <summary>
        /// AW_ACTIVE: 激活窗口, 在使用了 AW_HIDE 效果时不可使用此效果
        /// </summary>
        public const Int32 AW_ACTIVATE = 0x00020000;

        /// <summary>
        /// AW_SLIDE : 使用滑动类型, 默认为该类型. 当使用 AW_CENTER 效果时, 此效果被忽略
        /// </summary>
        public const Int32 AW_SLIDE = 0x00040000;

        /// <summary>
        /// AW_BLEND: 使用淡入效果
        /// </summary>
        public const Int32 AW_BLEND = 0x00080000;

        public Form1()
        {
            InitializeComponent();
            AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_CENTER);
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            AnimateWindow(this.Handle, 500, AW_SLIDE + AW_VER_POSITIVE + AW_HIDE);
        }

}
}

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