下载地址： http://files.cnblogs.com/chengulv/custompanel_demo.zip
using System;
namespace LC.Fun
{ /// <summary>Panel扩展 带圆角，颜色渐变</summary>
[System.Drawing.ToolboxBitmapAttribute(typeof(System.Windows.Forms.Panel))]
public class RoundPanel : System.Windows.Forms.Panel
{
/// <summary>渐变的方向</summary>
public enum LinearGradientMode
{
Horizontal = ,
Vertical = ,
ForwardDiagonal = ,
BackwardDiagonal = ,
None =
} /// <summary>
/// 圆角的位置
/// </summary>
[FlagsAttribute()]
public enum CornerCurveMode
{
None = ,
TopLeft = ,
TopRight = ,
TopLeft_TopRight = ,
BottomLeft = ,
TopLeft_BottomLeft = ,
TopRight_BottomLeft = ,
TopLeft_TopRight_BottomLeft = ,
BottomRight = ,
BottomRight_TopLeft = ,
BottomRight_TopRight = ,
BottomRight_TopLeft_TopRight = ,
BottomRight_BottomLeft = ,
BottomRight_TopLeft_BottomLeft = ,
BottomRight_TopRight_BottomLeft = ,
All = } // Fields
private System.Drawing.Color _BackColour1 = System.Drawing.SystemColors.Window;
private System.Drawing.Color _BackColour2 = System.Drawing.SystemColors.Window;
private LinearGradientMode _GradientMode = LinearGradientMode.None;
private System.Windows.Forms.BorderStyle _BorderStyle = System.Windows.Forms.BorderStyle.None;
private System.Drawing.Color _BorderColour = System.Drawing.SystemColors.WindowFrame;
private int _BorderWidth = ;
private int _Curvature = ;
// Properties
// Shadow the Backcolor property so that the base class will still render with a transparent backcolor
private CornerCurveMode _CurveMode = CornerCurveMode.All; [System.ComponentModel.DefaultValueAttribute(typeof(System.Drawing.Color), "Window"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("背景色1")]
public new System.Drawing.Color BackColor
{
get
{
return this._BackColour1;
}
set
{
this._BackColour1 = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(System.Drawing.Color), "Window"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("背景色2")]
public System.Drawing.Color BackColor2
{
get
{
return this._BackColour2;
}
set
{
this._BackColour2 = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(LinearGradientMode), "None"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("颜色渐变的方向")]
public LinearGradientMode GradientMode
{
get
{
return this._GradientMode;
}
set
{
this._GradientMode = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(System.Windows.Forms.BorderStyle), "None"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("边框的样式")]
public new System.Windows.Forms.BorderStyle BorderStyle
{
get
{
return this._BorderStyle;
}
set
{
this._BorderStyle = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(System.Drawing.Color), "WindowFrame"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("边框的颜色")]
public System.Drawing.Color BorderColor
{
get
{
return this._BorderColour;
}
set
{
this._BorderColour = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(int), ""), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("边框大小")]
public int BorderWidth
{
get
{
return this._BorderWidth;
}
set
{
this._BorderWidth = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(int), ""), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("圆角大小")]
public int Curvature
{
get
{
return this._Curvature;
}
set
{
this._Curvature = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} [System.ComponentModel.DefaultValueAttribute(typeof(CornerCurveMode), "All"), System.ComponentModel.CategoryAttribute("自定义cx"), System.ComponentModel.DescriptionAttribute("圆角的位置")]
public CornerCurveMode CurveMode
{
get
{
return this._CurveMode;
}
set
{
this._CurveMode = value;
if (this.DesignMode == true)
{
this.Invalidate();
}
}
} private int adjustedCurve
{
get
{
int curve = ;
if (!(this._CurveMode == CornerCurveMode.None))
{
if (this._Curvature > (this.ClientRectangle.Width / ))
{
curve = DoubleToInt(this.ClientRectangle.Width / );
}
else
{
curve = this._Curvature;
}
if (curve > (this.ClientRectangle.Height / ))
{
curve = DoubleToInt(this.ClientRectangle.Height / );
}
}
return curve;
}
} public RoundPanel()
: base()
{
this.SetDefaultControlStyles();
this.customInitialisation();
} private void SetDefaultControlStyles()
{
this.SetStyle(System.Windows.Forms.ControlStyles.DoubleBuffer, true);
this.SetStyle(System.Windows.Forms.ControlStyles.AllPaintingInWmPaint, false);
this.SetStyle(System.Windows.Forms.ControlStyles.ResizeRedraw, true);
this.SetStyle(System.Windows.Forms.ControlStyles.UserPaint, true);
this.SetStyle(System.Windows.Forms.ControlStyles.SupportsTransparentBackColor, true);
} private void customInitialisation()
{
this.SuspendLayout();
base.BackColor = System.Drawing.Color.Transparent;
this.BorderStyle = System.Windows.Forms.BorderStyle.None;
this.ResumeLayout(false);
} protected override void OnPaintBackground(System.Windows.Forms.PaintEventArgs pevent)
{
base.OnPaintBackground(pevent);
pevent.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
System.Drawing.Drawing2D.GraphicsPath graphPath;
graphPath = this.GetPath();
// Create Gradient Brush (Cannot be width or height 0)
System.Drawing.Drawing2D.LinearGradientBrush filler;
System.Drawing.Rectangle rect = this.ClientRectangle;
if (this.ClientRectangle.Width == )
{
rect.Width += ;
}
if (this.ClientRectangle.Height == )
{
rect.Height += ;
}
if (this._GradientMode == LinearGradientMode.None)
{
filler = new System.Drawing.Drawing2D.LinearGradientBrush(rect, this._BackColour1, this._BackColour1, System.Drawing.Drawing2D.LinearGradientMode.Vertical);
}
else
{
filler = new System.Drawing.Drawing2D.LinearGradientBrush(rect, this._BackColour1, this._BackColour2, ((System.Drawing.Drawing2D.LinearGradientMode)this._GradientMode));
}
pevent.Graphics.FillPath(filler, graphPath);
filler.Dispose();
if (this._BorderStyle == System.Windows.Forms.BorderStyle.FixedSingle)
{
System.Drawing.Pen borderPen = new System.Drawing.Pen(this._BorderColour, this._BorderWidth);
pevent.Graphics.DrawPath(borderPen, graphPath);
borderPen.Dispose();
}
else if (this._BorderStyle == System.Windows.Forms.BorderStyle.Fixed3D)
{
DrawBorder3D(pevent.Graphics, this.ClientRectangle);
}
else if (this._BorderStyle == System.Windows.Forms.BorderStyle.None)
{
}
filler.Dispose();
graphPath.Dispose();
} protected System.Drawing.Drawing2D.GraphicsPath GetPath()
{
System.Drawing.Drawing2D.GraphicsPath graphPath = new System.Drawing.Drawing2D.GraphicsPath();
if (this._BorderStyle == System.Windows.Forms.BorderStyle.Fixed3D)
{
graphPath.AddRectangle(this.ClientRectangle);
}
else
{
try
{
int curve = ;
System.Drawing.Rectangle rect = this.ClientRectangle;
int offset = ;
if (this._BorderStyle == System.Windows.Forms.BorderStyle.FixedSingle)
{
if (this._BorderWidth > )
{
offset = DoubleToInt(this.BorderWidth / );
}
curve = this.adjustedCurve;
}
else if (this._BorderStyle == System.Windows.Forms.BorderStyle.Fixed3D)
{
}
else if (this._BorderStyle == System.Windows.Forms.BorderStyle.None)
{
curve = this.adjustedCurve;
}
if (curve == )
{
graphPath.AddRectangle(System.Drawing.Rectangle.Inflate(rect, -offset, -offset));
}
else
{
int rectWidth = rect.Width - - offset;
int rectHeight = rect.Height - - offset;
int curveWidth = ;
if ((this._CurveMode & CornerCurveMode.TopRight) != )
{
curveWidth = (curve * );
}
else
{
curveWidth = ;
}
graphPath.AddArc(rectWidth - curveWidth, offset, curveWidth, curveWidth, , );
if ((this._CurveMode & CornerCurveMode.BottomRight) != )
{
curveWidth = (curve * );
}
else
{
curveWidth = ;
}
graphPath.AddArc(rectWidth - curveWidth, rectHeight - curveWidth, curveWidth, curveWidth, , );
if ((this._CurveMode & CornerCurveMode.BottomLeft) != )
{
curveWidth = (curve * );
}
else
{
curveWidth = ;
}
graphPath.AddArc(offset, rectHeight - curveWidth, curveWidth, curveWidth, , );
if ((this._CurveMode & CornerCurveMode.TopLeft) != )
{
curveWidth = (curve * );
}
else
{
curveWidth = ;
}
graphPath.AddArc(offset, offset, curveWidth, curveWidth, , );
graphPath.CloseFigure();
}
}
catch (System.Exception)
{
graphPath.AddRectangle(this.ClientRectangle);
}
}
return graphPath;
} public static void DrawBorder3D(System.Drawing.Graphics graphics, System.Drawing.Rectangle rectangle)
{
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.Default;
graphics.DrawLine(System.Drawing.SystemPens.ControlDark, rectangle.X, rectangle.Y, rectangle.Width - , rectangle.Y);
graphics.DrawLine(System.Drawing.SystemPens.ControlDark, rectangle.X, rectangle.Y, rectangle.X, rectangle.Height - );
graphics.DrawLine(System.Drawing.SystemPens.ControlDarkDark, rectangle.X + , rectangle.Y + , rectangle.Width - , rectangle.Y + );
graphics.DrawLine(System.Drawing.SystemPens.ControlDarkDark, rectangle.X + , rectangle.Y + , rectangle.X + , rectangle.Height - );
graphics.DrawLine(System.Drawing.SystemPens.ControlLight, rectangle.X + , rectangle.Height - , rectangle.Width - , rectangle.Height - );
graphics.DrawLine(System.Drawing.SystemPens.ControlLight, rectangle.Width - , rectangle.Y + , rectangle.Width - , rectangle.Height - );
graphics.DrawLine(System.Drawing.SystemPens.ControlLightLight, rectangle.X, rectangle.Height - , rectangle.Width - , rectangle.Height - );
graphics.DrawLine(System.Drawing.SystemPens.ControlLightLight, rectangle.Width - , rectangle.Y, rectangle.Width - , rectangle.Height - );
} public static int DoubleToInt(double value)
{
return System.Decimal.ToInt32(System.Decimal.Floor(System.Decimal.Parse((value).ToString())));
} }
}