自绘GroupBox控件

下面显示的是效果图:

自绘GroupBox控件

然后是代码,其中有一些解释:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace scyGroupBox
{
public partial class scyGroupBox : GroupBox
{

private GraphicsPath gpRegion = null;
private bool _mouseHover = false;
private bool _mouseDown = false;
private int textHeight = 0; //文本高度

public scyGroupBox()
{
InitializeComponent();
BackColor
= Color.YellowGreen;
gpRegion
= CreateRadiusRect(this.ClientRectangle, radius);
if (gpRegion != null)
{
this.Region = new Region(gpRegion);
}
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer | ControlStyles.UserPaint, true);
}

#region 圆角大小 Property
private int radius = 3;
public int Radius
{
get
{
return radius;
}
set
{
if (value < 0)
{
return;
}
else
{
radius
= value;
}
}
}
#endregion

#region 边线颜色
private Color borderColor = Color.DarkGreen;
public Color BorderColor
{
get { return borderColor; }
set { borderColor = value; }
}
#endregion

#region 上部渐变颜色
private Color uShineColor = Color.FromArgb(140, Color.White);
public Color UShineColor
{
get { return uShineColor; }
set { uShineColor = value; }
}
#endregion

/// <summary>
/// 描绘具有圆角的button原型路径
/// </summary>
protected virtual GraphicsPath CreateRadiusRect(Rectangle rectangle, int radius)
{
GraphicsPath path
= new GraphicsPath();

int l = rectangle.Left; //左边
int t = rectangle.Top; //上边
int w = rectangle.Width; //宽度
int h = rectangle.Height;// 高度
int d = radius / 2; //除以2,得到半径

path.AddArc(l,t,d,d,
180,90); //左上角
path.AddLine(l + radius, t, l + w - radius, t);//上边线

path.AddArc(l
+ w - d, t, d, d, 270, 90);//右上角
path.AddLine(l + w, t + radius, l + w, t + h - radius); //右边线

path.AddArc(l
+ w - d, t + h - d, d, d, 0, 90);//右下角
path.AddLine(l + w - radius, t + h, l + radius, t + h); //下边线

path.AddArc(l, t
+ h - d, d, d, 90, 90); //左下角
path.AddLine(l, t + h - radius, l, t + radius); //左边线

path.CloseFigure();
return path;
}

protected override void OnSizeChanged(EventArgs e)
{
gpRegion
= CreateRadiusRect(this.ClientRectangle, radius);
if (gpRegion != null)
{
this.Region = new Region(gpRegion);
}
base.OnSizeChanged(e);
}

//按照button路径进行border绘制
protected virtual void DrawBorder(Graphics g, Pen pen)
{
if (gpRegion != null)
{
g.SmoothingMode
= SmoothingMode.HighQuality;
g.InterpolationMode
= InterpolationMode.HighQualityBicubic;
g.DrawPath(pen, CreateRadiusRect(
new Rectangle(this.ClientRectangle.Left, this.ClientRectangle.Top, this.ClientRectangle.Width - 1, this.ClientRectangle.Height - 1), radius));
g.SmoothingMode
= SmoothingMode.Default;
g.InterpolationMode
= InterpolationMode.Default;
}
pen.Dispose();
pen
= null;
}

//绘制上部渐变色
protected virtual void DrawUpperShine(Graphics g)
{
Color c1
= Color.FromArgb(200,uShineColor);
Color c2
= Color.FromArgb(100,Color.White);
Rectangle rc
= new Rectangle(this.ClientRectangle.Left, this.ClientRectangle.Top, Width - 1, Height / 2);
if (_mouseDown)
{
rc
= new Rectangle(this.ClientRectangle.Left, this.ClientRectangle.Top, Width - 1, (Height - 10) / 2);
}
using (LinearGradientBrush lbrush = new LinearGradientBrush(rc, c1, c2, LinearGradientMode.Vertical))
{
g.FillRectangle(lbrush,rc);
}
}

//设置字体的大小,宽高,位置信息
protected virtual void DrawText(Graphics g)
{
if (!String.IsNullOrEmpty(this.Text.Trim()))
{
int x = 0;
int y = 0;
int w = 0;
int h = 0;

Size size
= g.MeasureString(Text, Font).ToSize();
w
= size.Width > Width ? Width : size.Width;
h
= size.Height > Height ? Height : size.Height;

Pen pen
= new Pen(ForeColor);

g.DrawString(Text, Font, pen.Brush,
new RectangleF((float)x + 10, (float)y + 3, (float)w + 3, (float)h));
pen.Dispose();
pen
= null;
textHeight
= w;
}
}

//绘制内部的方块
protected virtual void DrawInner(Graphics g, Rectangle rectangle, Pen p)
{
int l = rectangle.Left; //左边
int t = rectangle.Top;//上边
int w = rectangle.Width;//宽度
int h = rectangle.Height;//高度

g.DrawLine(p, l
+ 10, t + 20, l + w - 10, t + 20);//上边线
g.DrawLine(p, l + w - 10, t + 20, l + w - 10, t + h - 10); //右边线
g.DrawLine(p, l + w - 10, t + h - 10, l + 10, t + h - 10); //下边线
g.DrawLine(p, l + 10, t + h - 10, l + 10, t + 20); //左边线

Rectangle r
= new Rectangle(l + 10, t + 20, w - 18, h - 28);


g.FillRectangle(
new SolidBrush(Color.Wheat), r);
}

protected override void OnPaint(PaintEventArgs e)
{
Pen pen
= new Pen(borderColor);
Brush brush
= new SolidBrush(BackColor);
e.Graphics.FillPath(brush, gpRegion);
DrawText(e.Graphics);
DrawBorder(e.Graphics,pen);
DrawInner(e.Graphics,
this.ClientRectangle,new Pen(Color.Red));
DrawUpperShine(e.Graphics);
}

}
}

后续做详细的解释。

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