C# 重写RichTextBox带行号和下划线

C# 重写RichTextBox带行号和下划线效果如下

有几个关键点需要注意：

1，闪屏的问题

public UserRichTextBox()
{
//其它的不需要，只需要设置如下
//获取或设置一个值，该值指示控件在调整大小时是否重绘自己。
this.SetStyle(ControlStyles.ResizeRedraw, true);
//为用户控制启用双缓冲等控件样式
this.SetStyle(ControlStyles.DoubleBuffer, true);// 双缓冲
this.UpdateStyles();//这个也可以注释
InitializeComponent();
}

2，背景透明设置

public class AlphaRichTextBox : RichTextBox
{
//关键点：支持透明背景
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x020;
return cp;
}
}

}

3，源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace WinFmnotepad
{public partial class UserRichTextBox : UserControl{public UserRichTextBox(){//获取或设置一个值，该值指示控件在调整大小时是否重绘自己。this.SetStyle(ControlStyles.ResizeRedraw, true);//为用户控制启用双缓冲等控件样式this.SetStyle(ControlStyles.DoubleBuffer, true);// 双缓冲this.UpdateStyles();InitializeComponent();}protected override void OnLoad(EventArgs e){base.OnLoad(e);}private void showLineNo(){//获得当前坐标信息Point p = this.alphaRichTextBox1.Location;int crntFirstIndex = this.alphaRichTextBox1.GetCharIndexFromPosition(p);int crntFirstLine = this.alphaRichTextBox1.GetLineFromCharIndex(crntFirstIndex);Point crntFirstPos = this.alphaRichTextBox1.GetPositionFromCharIndex(crntFirstIndex);p.Y += this.alphaRichTextBox1.Height;int crntLastIndex = this.alphaRichTextBox1.GetCharIndexFromPosition(p);int crntLastLine = this.alphaRichTextBox1.GetLineFromCharIndex(crntLastIndex);Point crntLastPos = this.alphaRichTextBox1.GetPositionFromCharIndex(crntLastIndex);//准备画图Graphics g = this.panel1.CreateGraphics();Font font = new Font(this.alphaRichTextBox1.Font, this.alphaRichTextBox1.Font.Style);SolidBrush brush = new SolidBrush(Color.Green);//画图开始//刷新画布Rectangle rect = this.panel1.ClientRectangle;brush.Color = this.panel1.BackColor;g.FillRectangle(brush, 0, 0, this.panel1.ClientRectangle.Width, this.panel1.ClientRectangle.Height);brush.Color = Color.White;//重置画笔颜色//绘制行号int lineSpace = 0;if (crntFirstLine != crntLastLine){lineSpace = (crntLastPos.Y - crntFirstPos.Y) / (crntLastLine - crntFirstLine);}else{lineSpace = Convert.ToInt32(this.alphaRichTextBox1.Font.Size);}int brushX = this.panel1.ClientRectangle.Width - Convert.ToInt32(font.Size * 3);int brushY = crntLastPos.Y + Convert.ToInt32(font.Size * 0.21f);for (int i = crntLastLine; i >= crntFirstLine; i--){g.DrawString((i + 1).ToString(), font, brush, brushX, brushY);brushY -= lineSpace;}g.Dispose();font.Dispose();brush.Dispose();}private void alphaRichTextBox1_TextChanged(object sender, EventArgs e){showLineNo();}private void alphaRichTextBox1_Resize(object sender, EventArgs e){showLineNo();alphaRichTextBox1_lines();}private void alphaRichTextBox1_FontChanged(object sender, EventArgs e){showLineNo();alphaRichTextBox1_lines();}private void alphaRichTextBox1_Enter(object sender, EventArgs e){showLineNo();alphaRichTextBox1_lines();}private void alphaRichTextBox1_SizeChanged(object sender, EventArgs e){showLineNo();alphaRichTextBox1_lines();}private void alphaRichTextBox1_VScroll(object sender, EventArgs e){ // showLineNo();// alphaRichTextBox1_lines();}private void alphaRichTextBox1_lines(){//获得当前坐标信息Point p = new Point(0,0); //this.alphaRichTextBox1.Location;int crntFirstIndex = this.alphaRichTextBox1.GetCharIndexFromPosition(p);int crntFirstLine = this.alphaRichTextBox1.GetLineFromCharIndex(crntFirstIndex);Point crntFirstPos = this.alphaRichTextBox1.GetPositionFromCharIndex(crntFirstIndex);p.Y += this.alphaRichTextBox1.Height;int crntLastIndex = this.alphaRichTextBox1.GetCharIndexFromPosition(p);int crntLastLine = this.alphaRichTextBox1.GetLineFromCharIndex(crntLastIndex);Point crntLastPos = this.alphaRichTextBox1.GetPositionFromCharIndex(crntLastIndex);//准备画图Graphics g = this.alphaRichTextBox1.CreateGraphics();Font font = new Font(this.alphaRichTextBox1.Font, this.alphaRichTextBox1.Font.Style);SolidBrush brush = new SolidBrush(Color.Green);//画图开始//刷新画布Rectangle rect = this.alphaRichTextBox1.ClientRectangle;brush.Color = this.alphaRichTextBox1.BackColor;g.FillRectangle(brush, 0, 0, this.alphaRichTextBox1.ClientRectangle.Width, this.alphaRichTextBox1.ClientRectangle.Height);brush.Color = Color.White;//重置画笔颜色Pen pen = new Pen(System.Drawing.Color.DarkGray, 1);//绘制行int lineSpace = 0;if (crntFirstLine != crntLastLine){lineSpace = (crntLastPos.Y - crntFirstPos.Y) / (crntLastLine - crntFirstLine);}else{lineSpace = font.Height;}int brushX = this.panel1.ClientRectangle.Width - Convert.ToInt32(font.Size * 3);// int brushY = crntLastPos.Y + Convert.ToInt32(font.Size * 0.21f);int brushY =0;if (crntLastPos.Y + font.Height > font.Size){brushY = crntLastPos.Y + font.Height;}else {brushY =font.Height;}for (int i = crntLastLine; i >= crntFirstLine; i--){g.DrawLine(pen, new Point(0,brushY), new Point(this.alphaRichTextBox1.ClientRectangle.Width, brushY));brushY -= lineSpace;}g.Dispose();font.Dispose();brush.Dispose();alphaRichTextBox1.Invalidate();//刷新  要是只有这句话 还要重写OnPaint方法//alphaRichTextBox1.Update();// alphaRichTextBox1.Refresh();}protected override void OnPaint(PaintEventArgs e)//重写 {showLineNo();alphaRichTextBox1_lines();base.OnPaint(e);}#region 键盘键释放后发生//定义委托public delegate void alpha_KeyUp(object sender, EventArgs e);//定义事件public event alpha_KeyUp UserControl_KeyUp;public void alphaRichTextBox1_KeyUp(object sender, KeyEventArgs e){if (UserControl_KeyUp != null){UserControl_KeyUp(sender, e);}}#endregion#region 回车时发生//定义委托public delegate void alpha_Enter(object sender, EventArgs e);//定义事件public event alpha_Enter UserControl_Enter;private void UserRichTextBox_Enter(object sender, EventArgs e){if (UserControl_Enter != null){UserControl_Enter(sender, e);}}#endregion#region 按下鼠标键时发生//定义委托public delegate void alpha_MouseDown(object sender, MouseEventArgs e);//定义事件public event alpha_MouseDown UserControl_MouseDown;private void alphaRichTextBox1_MouseDown(object sender, MouseEventArgs e){if (UserControl_MouseDown != null){UserControl_MouseDown(sender, e);}}#endregion#region 鼠标单击时发生//定义委托public delegate void alpha_MouseClick(object sender, MouseEventArgs e);//定义事件public event alpha_MouseClick UserControl_MouseClick;private void alphaRichTextBox1_MouseClick(object sender, MouseEventArgs e){if (UserControl_MouseClick != null){UserControl_MouseClick(sender, e);}}#endregion#region 右键菜单//全选private void ALLselectTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select();RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.SelectAll();}//剪切private void CutTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select();RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.Cut();}//复制private void CopyTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select(); // 先获取焦点，防止点两下才运行RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.Copy();}//粘贴private void PasteTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select();RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.Paste();}//撤消private void UndoTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select();RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.Undo();}//删除private void DelTSMItem_Click(object sender, EventArgs e){this.contextMenuStrip1.SourceControl.Select();RichTextBox rtb = (RichTextBox)this.contextMenuStrip1.SourceControl;rtb.SelectedText = "";}#endregion}public class AlphaRichTextBox : RichTextBox{//关键点：支持透明背景  protected override CreateParams CreateParams{get{CreateParams cp = base.CreateParams;cp.ExStyle |= 0x020;return cp;}}}}

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