c#之利用API函数实现动画窗体的方法详解

这里主要利用API函数Animate Window实现窗体左右，上下，扩展，淡入滑动或滚动动画效果，步骤如下：
1.新建窗体，使用2个GroupBox控件。
2.在控件1中添加2个RadioButton控件，并设置Text分别为“滚动窗体”，“滑动窗体”，并使前者Checked设置为True。
3.在空间2中添加6个按钮，Text分别为“自左向右动画”，“自右向左动画”，“自上向下动画”，“自下向上动画”，“向外扩展动画”，“淡入动画窗体”。
4.添加一新的Window窗体，设置Text为“动画窗体”。设置其“BackgroundImage”属性，导入一张要加载的图像，然后设置其“BackgroundImageLayout”属性为“Stretch”。
5.各按钮事件主要代码如下：

private void button1_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            if (radioButton1.Checked == true)
            {
                myf.Text = "自左向右滚动窗体动画效果";
            }
            else
            {
                myf.Text = "自左向右滑动窗体动画效果";
            }
            myf.Show();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            if (radioButton1.Checked == true)
            {
                myf.Text = "自右向左滚动窗体动画效果";
            }
            else
            {
                myf.Text = "自右向左滑动窗体动画效果";
            }
            myf.Show();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            if (radioButton1.Checked == true)
            {
                myf.Text = "自上向下滚动窗体动画效果";
            }
            else
            {
                myf.Text = "自上向下滑动窗体动画效果";
            }
            myf.Show();
        }
        private void button5_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            if (radioButton1.Checked == true)
            {
                myf.Text = "自下向上滚动窗体动画效果";
            }
            else
            {
                myf.Text = "自下向上滑动窗体动画效果";
            }
            myf.Show();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            myf.Text = "向外扩展窗体动画效果";
            myf.Show();
        }
        private void button6_Click(object sender, EventArgs e)
        {
            Form2 myf = new Form2();
            myf.Text = "淡入窗体动画效果";
            myf.Show();
        }

6.双击Form2窗体，进入代码视图。首先定义公用变量，具体代码如下：

        public const Int32 AW_HOR_POSITIVE = 0X00000001;
        public const Int32 AW_HOR_NEGATIVE = 0X00000002;
        public const Int32 AW_VER_POSITIVE = 0X00000004;
        public const Int32 AW_VER_NEGATIVE = 0X00000008;
        public const Int32 AW_CENTER = 0X00000010;
        public const Int32 AW_HIDE = 0X00010000;
        public const Int32 AW_ACTIVATE = 0X00020000;
        public const Int32 AW_SLIDE = 0X00040000;
        public const Int32 AW_BLEND = 0X00080000;
        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        private static extern bool AnimateWindow(IntPtr hwnd,int dwTime,int dwFlags);

7.下面为Form2窗体添加加载事件代码，具体如下：

        private void Form2_Load(object sender, EventArgs e)
        {
            if (this.Text == "自左向右滚动窗体动画效果")
            {
                AnimateWindow(this.Handle,2000,AW_HOR_POSITIVE);
            }
            if (this.Text == "自左向右滑动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_SLIDE+AW_HOR_POSITIVE);
            }
            if (this.Text == "自右向左滚动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_HOR_NEGATIVE);
            }
            if (this.Text == "自右向左滑动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_SLIDE + AW_HOR_NEGATIVE);
            }
            if (this.Text == "自上向下滚动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_VER_POSITIVE);
            }
            if (this.Text == "自上向下滑动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_SLIDE + AW_VER_POSITIVE);
            }
            if (this.Text == "自下向上滚动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_VER_NEGATIVE);
            }
            if (this.Text == "自下向上滑动窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_SLIDE + AW_VER_NEGATIVE);
            }
            if (this.Text == "向外扩展窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_SLIDE + AW_CENTER);
            }
            if (this.Text == "淡入窗体动画效果")
            {
                AnimateWindow(this.Handle, 2000, AW_BLEND);
            }
        }//yinyiniao's Blog