1.解决方案下添加新建项目新建类库
2. 在项目下添加新建项选择新建组件类
3.先引用，然后导入两个命名空间
4.因为是扩展控件，把继承自Component改成继承自Panel
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics; using System.Linq;
using System.Security.Principal;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Drawing;
namespace FJZControl
{
public partial class FJZPanel : Panel
{
public FJZPanel()
{
InitializeComponent();
} public FJZPanel(IContainer container)
{
container.Add(this); InitializeComponent();
}
#region 属性
private Color headBackColor = Color.LimeGreen;
[Category("我的自定义Panel控件属性")]
[Description("标题的背景颜色")]
public Color HeadBackColor
{
get
{
return headBackColor;
} set
{
headBackColor = value; this.Invalidate();
}
} private Color headForeColor = Color.Black;
[Category("我的自定义Panel控件属性")]
[Description("标题的背景颜色")]
public Color HeadForeColor
{
get
{
return headForeColor;
} set
{
headForeColor = value; this.Invalidate();
}
} private int headHeight = ;
[Category("我的自定义Panel控件属性")]
[Description("标题的高度")]
public int HeadHeight
{
get
{
return headHeight;
} set
{
headHeight = value;
this.Invalidate();
}
} private string headText = "标题名称";
[Category("我的自定义Panel控件属性")]
[Description("标题的名称")]
public string HeadText
{
get { return headText; }
set
{
this.headText = value;
this.Invalidate();
} } private float linearScale=0.4f;
[Category("我的自定义Panel控件属性")]
[Description("渐变程度")]
public float LinearScale
{
get
{
return linearScale;
} set
{
linearScale = value;
this.Invalidate();
}
}
#endregion #region 字段
Graphics g;
Pen p;
SolidBrush sb;
#endregion
#region 方法
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
//自定义绘制过程 //获取这个画布
g = e.Graphics; //设置画布
SetGrahics(); //第一步:画标题框
using (LinearGradientBrush brush = new LinearGradientBrush(new PointF(, ), new PointF(, this.headHeight), GetStartLinearColor(this.headBackColor), this.headBackColor))
{
g.FillRectangle(brush, new RectangleF(, , this.Width, this.headHeight));
}
//第二步:标题
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
using(SolidBrush sb=new SolidBrush(this.headForeColor))
{
g.DrawString(this.headText, this.Font, sb,new RectangleF( ,,this.Width, this.headHeight), sf);
}
//第三步:画边框
using(Pen p=new Pen(this.headBackColor))
{
g.DrawRectangle(p, , , this.Width-, this.Height-);
g.DrawLine(p, , this.HeadHeight, this.Width - , this.headHeight - );
}
}
//设置画布属性
private void SetGrahics()
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.SmoothingMode = SmoothingMode.HighQuality; g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
g.TextRenderingHint = TextRenderingHint.AntiAlias; } //获取
private Color GetStartLinearColor(Color EndLinearColor)
{
return Color.FromArgb((int)(EndLinearColor.R + ( - EndLinearColor.R) * this.linearScale), (int)(EndLinearColor.G + ( - EndLinearColor.G) * this.linearScale), (int)(EndLinearColor.B + ( - EndLinearColor.B) * this.linearScale));
}
#endregion
}
}
效果如下：