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   源码介绍

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C#界面设计是一件比较麻烦的事情，本例子通过模仿暴风影音的界面，向大家介绍c# GUI皮肤的制作方法

 #region 初始化变量
        protected int formMinX = 0;//最小化按钮的X坐标
        protected int formMaxX = 0;//最大化按钮的X坐标
        protected int formCloseX = 0;//关闭按钮的X坐标
        protected int formTitleMarginLeft = 0;//标题栏的左边界
        protected int formTitleMarginRight = 0;//标题栏的右边界
        Image imgTopLeft = (Image)Resources.topleft;//窗体顶部左上角图片
        Image imgTopRight = (Image)Resources.topright;//窗体顶部右上角图片
        Image imgTopMiddle = (Image)Resources.topstretch;//窗体顶部中间图片
        Image imgBottomLeft = (Image)Resources.bottomLeft;//窗体底部左下角图片
        Image imgBottonRight = (Image)Resources.bottomRight;//窗体底部右下角图片
        Image imgBottonmMiddle = (Image)Resources.bottomstretch;//窗体底部中间图片
        Image imgMiddleLeft = (Image)Resources.LeftDrag_Mid;//窗体中部左边框图片
        Image imgMiddleRight = (Image)Resources.RightDrag_Mid;//窗体中部右边框图片
        Image imgFormMin = (Image)Resources.skin_btn_min;//最小化按钮
        Image imgFormMax = (Image)Resources.skin_btn_max;//最大化按钮
        Image imgFormClose = (Image)Resources.skin_btn_close;//关闭按钮
        Image imgFormRestore = (Image)Resources.skin_btn_restore;//还原按钮
        #endregion
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            this.BackColor = Color.Black;
            //绘制皮肤
            Graphics g = e.Graphics;
            //绘制窗体顶部左上角图片
            g.DrawImage(imgTopLeft, 0, 0, imgTopLeft.Width, imgTopLeft.Height);
            int topRightX = e.ClipRectangle.Width - imgTopRight.Width;
            //绘制窗体顶部右上角图片
            g.DrawImage(imgTopRight, topRightX, 0, imgTopRight.Width, imgTopRight.Height);
            int topMiddleWidth= e.ClipRectangle.Width - (imgTopLeft.Width imgTopRight.Width) 4;
            //绘制窗体顶部中间图片(标题栏)
            formTitleMarginLeft = imgTopLeft.Width;
            formTitleMarginRight = topRightX;
            g.DrawImage(imgTopMiddle, imgTopLeft.Width, 0, topMiddleWidth, imgTopMiddle.Height);
            //绘制窗体底部左下角图片
            g.DrawImage(imgBottomLeft, 0, e.ClipRectangle.Height - imgBottomLeft.Height, imgBottomLeft.Width, imgBottomLeft.Height);
            //绘制窗体底部右下角图片
            g.DrawImage(imgBottonRight, e.ClipRectangle.Width - imgBottomLeft.Width, e.ClipRectangle.Height - imgBottonRight.Height, imgBottonRight.Width, imgBottonRight.Height);
            //绘制窗体底部中间图片
            g.DrawImage(imgBottonmMiddle, imgBottomLeft.Width, e.ClipRectangle.Height - imgBottonmMiddle.Height, e.ClipRectangle.Width - (imgBottomLeft.Width imgBottomLeft.Width) 4, imgBottonmMiddle.Height);
            //画左右边框
            g.DrawImage(imgMiddleLeft, 0, imgTopLeft.Height, imgMiddleLeft.Width, e.ClipRectangle.Height - (imgTopLeft.Height imgBottomLeft.Height));
            g.DrawImage(imgMiddleRight, e.ClipRectangle.Width - imgMiddleRight.Width, imgTopRight.Height, imgMiddleRight.Width, e.ClipRectangle.Height - (imgTopLeft.Height imgBottomLeft.Height));
            //画右上角按钮（最小化，最大化，关闭）
            formMinX = topRightX;
            g.DrawImage(imgFormMin, topRightX, 0, imgFormMin.Width, imgFormMin.Height);
            if (this.WindowState == FormWindowState.Maximized)
            {
                imgFormMax = imgFormRestore;
            }
            else
                imgFormMax = (Image)Resources.skin_btn_max;
            formMaxX = topRightX imgFormMin.Width;
            g.DrawImage(imgFormMax, topRightX imgFormMin.Width, 0, imgFormMax.Width, imgFormMax.Height);
            formCloseX = topRightX imgFormMax.Width imgFormMin.Width;
            g.DrawImage(imgFormClose, topRightX imgFormMax.Width imgFormMin.Width, 0, imgFormClose.Width, imgFormClose.Height);
        }
        protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
            Invalidate();
        }

        #region 鼠标拖拽改变无边框窗体大小
        const int WM_NCHITTEST = 0x0084;
        const int HTLEFT = 10;
        const int HTRIGHT = 11;
        const int HTTOP = 12;
        const int HTTOPLEFT = 13;
        const int HTTOPRIGHT = 14;
        const int HTBOTTOM = 15;
        const int HTBOTTOMLEFT = 0x10;
        const int HTBOTTOMRIGHT = 17;

        protected override void WndProc(ref Message m)
        {