using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Drawing; 
using System.Drawing.Imaging; 
using System.Drawing.Drawing2D; 
using System.Data; 
using System.Text; 
using System.Windows.Forms; 
 
namespace MyControls 
{ 
    public partial class CrystalButton : Button    
    { 
        private enum MouseActionType 
        { 
            None, 
            Hover, 
            Click 
        } 
 
        private MouseActionType mouseAction; 
        private ImageAttributes imgAttr = new ImageAttributes(); 
        private Bitmap buttonBitmap; 
        private Rectangle buttonBitmapRectangle; 
 
        public CrystalButton() 
        { 
            InitializeComponent(); 
 
            mouseAction = MouseActionType.None; 
 
            this.SetStyle(ControlStyles.AllPaintingInWmPaint  
                ControlStyles.DoubleBuffer  
                ControlStyles.UserPaint, true); 
 
            //The following defaults are better suited to draw the text outline 
            this.Font = new Font("Arial Black", 12, FontStyle.Bold); 
            this.BackColor = Color.DarkTurquoise; 
            this.Size = new Size(112, 48); 
        } 
 
        private GraphicsPath GetGraphicsPath(Rectangle rc, int r) 
        { 
            int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height; 
            GraphicsPath path = new GraphicsPath(); 
            path.AddArc(x, y, r, r, 180, 90);               //Upper left corner 
            path.AddArc(x + w - r, y, r, r, 270, 90);           //Upper right corner 
            path.AddArc(x + w - r, y + h - r, r, r, 0, 90);     //Lower right corner 
            path.AddArc(x, y + h - r, r, r, 90, 90);            //Lower left corner 
            path.CloseFigure(); 
            return path; 
        } 
 
        protected override void OnPaint(PaintEventArgs e) 
        { 
            Graphics g = e.Graphics; 
            //g.Clear(Color.White); 
            g.Clear(SystemColors.ButtonFace ); 
            Color clr = this.BackColor; 
            int shadowOffset = 8; 
            int btnOffset = 0; 
            switch (mouseAction) 
            { 
                case MouseActionType.Click: 
                    shadowOffset = 4; 
                    clr = Color.LightGray; 
                    btnOffset = 2; 
                    break; 
                case MouseActionType.Hover: 
                    clr = Color.LightGray; 
                    break; 
            } 
            g.SmoothingMode = SmoothingMode.AntiAlias; 
 
            /// 
            /// 创建按钮本身的图形 
            ///  
            Rectangle rc = new Rectangle(btnOffset, btnOffset, this.ClientSize.Width - 8 - btnOffset, this.ClientSize.Height - 8 - btnOffset); 
            GraphicsPath path1 = this.GetGraphicsPath(rc, 20); 
            LinearGradientBrush br1 = new LinearGradientBrush(new Point(0, 0), new Point(0, rc.Height + 6), clr, Color.White); 
 
            /// 
            /// 创建按钮阴影 
            ///  
            Rectangle rc2 = rc; 
            rc2.Offset(shadowOffset, shadowOffset); 
            GraphicsPath path2 = this.GetGraphicsPath(rc2, 20); 
            PathGradientBrush br2 = new PathGradientBrush(path2); 
            br2.CenterColor = Color.Black; 
            br2.SurroundColors = new Color[] {SystemColors.ButtonFace}; 
            //为了更逼真，我们将渐变结束颜色设定为窗体前景颜色，可以根据窗口的前景颜色适当调整 
            
            /// 
            /// 创建按钮顶部白色渐变 
            ///  
            Rectangle rc3 = rc; 
            rc3.Inflate(-5, -5); 
            rc3.Height = 15; 
            GraphicsPath path3 = GetGraphicsPath(rc3, 20); 
            LinearGradientBrush br3 = new LinearGradientBrush(rc3, Color.FromArgb(255, Color.White), Color.FromArgb(0, Color.White), LinearGradientMode.Vertical); 
 
            /// 
            /// 绘制图形 
            /// 
            g.FillPath(br2, path2); //绘制阴影 
            g.FillPath(br1, path1); //绘制按钮 
            g.FillPath(br3, path3); //绘制顶部白色泡泡 
 
            /// 
            ///设定内存位图对象，进行二级缓存绘图操作 
            /// 
            buttonBitmapRectangle = new Rectangle(rc.Location, rc.Size); 
            buttonBitmap = new Bitmap(buttonBitmapRectangle.Width, buttonBitmapRectangle.Height); 
            Graphics g_bmp = Graphics.FromImage(buttonBitmap); 
            g_bmp.SmoothingMode = SmoothingMode.AntiAlias; 
            g_bmp.FillPath(br1, path1); 
            g_bmp.FillPath(br3, path3); 
 
            /// 
            ///将region赋值给button 
            Region rgn = new Region(path1); 
            rgn.Union(path2); 
            this.Region = rgn; 
 
            /// 
            /// 绘制按钮的文本 
            ///  
            GraphicsPath path4 = new GraphicsPath(); 
 
            RectangleF path1bounds = path1.GetBounds(); 
            
            Rectangle rcText = new Rectangle((int)path1bounds.X + btnOffset, (int)path1bounds.Y + btnOffset, (int)path1bounds.Width, (int)path1bounds.Height); 
 
            StringFormat strformat = new StringFormat(); 
            strformat.Alignment = StringAlignment.Center; 
            strformat.LineAlignment = StringAlignment.Center; 
            path4.AddString(this.Text, this.Font.FontFamily, (int)this.Font.Style, this.Font.Size, rcText, strformat); 
 
            Pen txtPen = new Pen(this.ForeColor , 1); 
            g.DrawPath(txtPen, path4); 
            g_bmp.DrawPath(txtPen, path4); 
        } 
 
        protected override void OnMouseDown(MouseEventArgs e) 
        { 
            if (e.Button == MouseButtons.Left) 
            { 
                this.mouseAction = MouseActionType.Click; 
                this.Invalidate(); 
            } 
            base.OnMouseDown(e); 
        } 
 
        protected override void OnMouseUp(MouseEventArgs e) 
        { 
            this.mouseAction = MouseActionType.Hover; 
            this.Invalidate(); 
            base.OnMouseUp(e); 
        } 
 
        protected override void OnMouseHover(EventArgs e) 
        { 
            this.mouseAction = MouseActionType.Hover; 
            this.Invalidate(); 
            base.OnMouseHover(e); 
        } 
 
        protected override void OnMouseEnter(EventArgs e) 
        { 
            this.mouseAction = MouseActionType.Hover; 
            this.Invalidate(); 
            base.OnMouseEnter(e); 
        } 
 
        protected override void OnMouseLeave(EventArgs e) 
        { 
            this.mouseAction = MouseActionType.None; 
            this.Invalidate(); 
            base.OnMouseLeave(e); 
        } 
    } 
}