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