自制水晶按钮

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 DrawButton

{

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;

// private Color clr;

private bool IsRaised = true;

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(SystemColors.ButtonFace);

Color clr = this.BackColor;

int shadowOffset = 8;

int btnOffset = 0;

switch (mouseAction)

{

case MouseActionType.Click:

shadowOffset = 4;

clr = Color.Yellow;

btnOffset = 2;

break;

case MouseActionType.Hover:

clr = Color.LightGray;

//clr = Color.Yellow;

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);

}

}

}