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using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace GButton
{
public partial class GZXButton : Button
{
private enum MouseActionType
{
None,
Hover,
Click
}
private MouseActionType mouseActionType;
private ImageAttributes imgattr = new ImageAttributes();//实例化一个图像属性类
private Bitmap btnbmp;//定义一个位图
private Rectangle btnrc;//定义一个矩形
public GZXButton()
{
InitializeComponent();
mouseActionType = MouseActionType.None;
this.SetStyle(ControlStyles.AllPaintingInWmPaint|//禁止擦除背景
ControlStyles.DoubleBuffer|//双缓冲
ControlStyles.UserPaint,true);
//下面这些可以不设置,也可以自己定义
this.Font = new Font("Aial Black", 12, FontStyle.Bold);
this.BackColor = Color.DarkTurquoise;
this.Size = new Size(112, 48);
}
/// <summary>
/// 按钮形状
/// </summary>
/// <param name="rc">按钮的坐标和大小</param>
/// <param name="r">按钮圆弧的半径</param>
/// <returns>返回按钮形状</returns>
private GraphicsPath GetGraphicsPath(Rectangle rc, int r)
{
int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height;
GraphicsPath gpath = new GraphicsPath();
gpath.AddArc(x, y, r, r, 180, 90);//左上角圆弧
gpath.AddArc(x + w - r, y, r, r, 270, 90);//右上角圆弧
gpath.AddArc(x + w - r, y + h - r,r, r, 0, 90);//右下角圆弧
gpath.AddArc(x, y + h - r, r, r, 90, 90);//左下角圆弧
gpath.CloseFigure();//闭合
return gpath;
}
protected override void OnPaint(PaintEventArgs pe)
{
// base.OnPaint(pe);
Graphics g = pe.Graphics;//创建画布
g.Clear(SystemColors.ButtonFace);//重置背景颜色,可以自定义
Color clr = this.BackColor;
int btnOff = 0;//按钮边距
int shadowOff = 0;//阴影边距
switch (mouseActionType)
{
case MouseActionType.None:
break;
case MouseActionType.Hover:
clr = Color.LightGray;
break;
case MouseActionType.Click:
shadowOff = 4;
clr = Color.LightGray;
btnOff = 2;
break;
default:
break;
}
g.SmoothingMode = SmoothingMode.AntiAlias;//消除锯齿
//创建按钮本身的图形
Rectangle rc1 = new Rectangle(btnOff, btnOff, this.ClientSize.Width - 8 - btnOff, this.ClientSize.Height - 8 - btnOff);
GraphicsPath gpath1 = this.GetGraphicsPath(rc1, 20);
LinearGradientBrush br1 = new LinearGradientBrush(new Point(0, 0), new Point(0, rc1.Height + 6), clr, Color.White);
//创建按钮阴影
Rectangle rc2 = rc1;
rc2.Offset(shadowOff, shadowOff);
GraphicsPath gpath2 = this.GetGraphicsPath(rc2, 20);
PathGradientBrush br2 = new PathGradientBrush(gpath2);
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 = rc1;
rc3.Inflate(-5, -5);
rc3.Height = 15;
GraphicsPath gpath3 = 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, gpath2);//绘制阴影
g.FillPath(br1, gpath1);//绘制按钮
g.FillPath(br3, gpath3);//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
btnrc = new Rectangle(rc1.Location, rc1.Size);
btnbmp = new Bitmap(btnrc.Width, btnrc.Height);
Graphics g_bmp = Graphics.FromImage(btnbmp);
g_bmp.SmoothingMode = SmoothingMode.AntiAlias;
g_bmp.FillPath(br1, gpath1);
g_bmp.FillPath(br3, gpath3);
//将region赋值给button
Region rgn = new Region(gpath1);
rgn.Union(gpath2);
this.Region = rgn;
//绘制按钮的文本
GraphicsPath gpath4 = new GraphicsPath();
RectangleF gpath1bounds = gpath1.GetBounds();
Rectangle rcText = new Rectangle((int)gpath1bounds.X + btnOff, (int)gpath1bounds.Y + btnOff, (int)gpath1bounds.Width,
(int)gpath1bounds.Height);
StringFormat strFormat = new StringFormat();
strFormat.Alignment = StringAlignment.Center;
strFormat.LineAlignment = StringAlignment.Center;//横竖都居中
gpath4.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, gpath4);
g_bmp.DrawPath(txtPen, gpath4);
}
protected override void OnMouseDown(MouseEventArgs mevent)
{
if (mevent.Button == MouseButtons.Left)
{
this.mouseActionType = MouseActionType.Click;
this.Invalidate();
}
base.OnMouseDown(mevent);
}
protected override void OnMouseUp(MouseEventArgs mevent)
{
this.mouseActionType = MouseActionType.Hover;
this.Invalidate();
base.OnMouseUp(mevent);
}
protected override void OnMouseHover(EventArgs e)
{
this.mouseActionType = MouseActionType.Hover;
this.Invalidate();
base.OnMouseHover(e);
}
protected override void OnMouseEnter(EventArgs e)
{
this.mouseActionType = MouseActionType.Hover;
this.Invalidate();
base.OnMouseEnter(e);
}
protected override void OnMouseLeave(EventArgs e)//鼠标离开事件
{
this.mouseActionType = MouseActionType.None;
this.Invalidate();
base.OnMouseLeave(e);
}
}
}