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C#?RichTextBox制作文本編輯器

更新時(shí)間：2017年04月11日 16:32:26 作者：飛翔的月亮

這篇文章主要為大家詳細(xì)介紹了C#?RichTextBox制作文本編輯器的方法，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文利用一個(gè)簡(jiǎn)單的小例子【文本編輯器】，講解RichTextBox的用法。

Windows窗體中的RichTextBox控件用于顯示，輸入和操作格式化的文本，RichTextBox除了擁有TextBox控件的所有功能外，還可以顯示字體，顏色，鏈接，從文件中讀取和加載圖像，以及查找指定的字符。RichTextBox控件通常用于提供類似字體處理程序（如Microsoft Word）的文本操作和顯示功能。RichTextBox控件可以顯示滾動(dòng)條，且默認(rèn)根據(jù)需要進(jìn)行顯示。

涉及知識(shí)點(diǎn)：

SelectionFont 獲取或設(shè)置當(dāng)前選定文本或點(diǎn)的字體。
FontStyle 指定應(yīng)用到文本的字形信息。
SelectionAlignment 獲取或設(shè)置應(yīng)用到當(dāng)前選定內(nèi)容或點(diǎn)的對(duì)齊方式。
SelectionIndent 獲取或設(shè)置所選內(nèi)容開始行的縮進(jìn)距離（以像素為單位）。
SelectionCharOffset 獲取或設(shè)置控件中的文本是顯示在基線上、作為上標(biāo)還是作為基線下方的下標(biāo)。
SelectionColor 獲取或設(shè)置當(dāng)前選定文本或點(diǎn)的文本顏色。
SelectionBackColor 獲取或設(shè)置在 System.Windows.Forms.RichTextBox 控件中選中文本時(shí)文本的顏色。
SelectionBullet 獲取或設(shè)置一個(gè)值，通過該值指示項(xiàng)目符號(hào)樣式是否應(yīng)用到當(dāng)前選定內(nèi)容或點(diǎn)。
Clipboard Paste 粘貼指定剪貼板格式的剪貼板內(nèi)容【圖片時(shí)使用】。
Find 在對(duì)搜索應(yīng)用特定選項(xiàng)的情況下，在 System.Windows.Forms.RichTextBox 控件的文本中搜索位于控件內(nèi)特定位置的字符串。

效果圖如下【以下設(shè)置文本對(duì)應(yīng)的格式】：

核心代碼如下

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Printing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DemoRichText.Model
{
 public class DefaultRickFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {

  }
 }

 /// <summary>
 /// 加粗格式
 /// </summary>
 public class BoldRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   Font oldFont = rtbInfo.SelectionFont;
   Font newFont;
   if (oldFont.Bold)
   {
    newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Bold);//支持位于運(yùn)算
   }
   else
   {
    newFont = new Font(oldFont, oldFont.Style | FontStyle.Bold);
   }
   rtbInfo.SelectionFont = newFont;
  }
 }

 /// <summary>
 /// 斜體
 /// </summary>
 public class ItalicRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   Font oldFont = rtbInfo.SelectionFont;
   Font newFont;
   if (oldFont.Italic)
   {
    newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Italic);
   }
   else
   {
    newFont = new Font(oldFont, oldFont.Style | FontStyle.Italic);
   }
   rtbInfo.SelectionFont = newFont;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 下劃線
 /// </summary>
 public class UnderLineRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   Font oldFont = rtbInfo.SelectionFont;
   Font newFont;
   if (oldFont.Underline)
   {
    newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Underline);
   }
   else
   {
    newFont = new Font(oldFont, oldFont.Style | FontStyle.Underline);
   }
   rtbInfo.SelectionFont = newFont;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 刪除線
 /// </summary>
 public class StrikeLineRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   Font oldFont = rtbInfo.SelectionFont;
   Font newFont;
   if (oldFont.Underline)
   {
    newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Strikeout);
   }
   else
   {
    newFont = new Font(oldFont, oldFont.Style | FontStyle.Strikeout);
   }
   rtbInfo.SelectionFont = newFont;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 左對(duì)齊
 /// </summary>
 public class LeftRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   rtbInfo.SelectionAlignment = HorizontalAlignment.Left;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 居中對(duì)齊
 /// </summary>
 public class CenterRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   if (rtbInfo.SelectionAlignment == HorizontalAlignment.Center)
   {
    rtbInfo.SelectionAlignment = HorizontalAlignment.Left;
   }
   else
   {
    rtbInfo.SelectionAlignment = HorizontalAlignment.Center;
   }

   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 右對(duì)齊
 /// </summary>
 public class RightRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   if (rtbInfo.SelectionAlignment == HorizontalAlignment.Right)
   {
    rtbInfo.SelectionAlignment = HorizontalAlignment.Left;
   }
   else
   {
    rtbInfo.SelectionAlignment = HorizontalAlignment.Right;
   }

   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 縮進(jìn)對(duì)齊
 /// </summary>
 public class IndentRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   //每次以10個(gè)像素進(jìn)行縮進(jìn)
   rtbInfo.SelectionIndent = rtbInfo.SelectionIndent + 10;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 縮進(jìn)對(duì)齊
 /// </summary>
 public class OutIndentRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   //每次以10個(gè)像素進(jìn)行縮進(jìn)
   rtbInfo.SelectionIndent = rtbInfo.SelectionIndent - 10;
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 下標(biāo)
 /// </summary>
 public class SubScriptRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   if (rtbInfo.SelectionCharOffset < 0)
   {
    rtbInfo.SelectionCharOffset = 0;
   }
   else {
    rtbInfo.SelectionCharOffset = -5;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 上標(biāo)
 /// </summary>
 public class SuperScriptRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   if (rtbInfo.SelectionCharOffset > 0)
   {
    rtbInfo.SelectionCharOffset = 0;
   }
   else {
    rtbInfo.SelectionCharOffset = 5;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 字體
 /// </summary>
 public class FontRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   FontDialog f = new FontDialog();
   if (f.ShowDialog() == DialogResult.OK)
   {
    FontFamily family = f.Font.FontFamily;
    rtbInfo.SelectionFont = new Font(family, rtbInfo.SelectionFont.Size, rtbInfo.SelectionFont.Style);
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 文本顏色
 /// </summary>
 public class ForeColorRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   ColorDialog f = new ColorDialog();
   if (f.ShowDialog() == DialogResult.OK)
   {

    rtbInfo.SelectionColor = f.Color;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 文本背景顏色
 /// </summary>
 public class BgColorRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   ColorDialog f = new ColorDialog();
   if (f.ShowDialog() == DialogResult.OK)
   {

    rtbInfo.SelectionBackColor = f.Color;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// UL列表,項(xiàng)目符號(hào)樣式
 /// </summary>
 public class UlRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   if (rtbInfo.SelectionBullet)
   {
    rtbInfo.SelectionBullet = false;
   }
   else {
    rtbInfo.SelectionBullet = true;
    rtbInfo.BulletIndent = 10;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// </summary>
 public class PicRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   OpenFileDialog o = new OpenFileDialog();
   o.InitialDirectory = AppDomain.CurrentDomain.BaseDirectory;
   o.Title = "請(qǐng)選擇圖片";
   o.Filter = "jpeg|*.jpeg|jpg|*.jpg|png|*.png|gif|*.gif"; 
   if (o.ShowDialog() == DialogResult.OK) {
    string fileName = o.FileName;
    try
    {
     Image bmp = Image.FromFile(fileName);
     Clipboard.SetDataObject(bmp);

     DataFormats.Format dataFormat = DataFormats.GetFormat(DataFormats.Bitmap);
     if (rtbInfo.CanPaste(dataFormat))
     {
      rtbInfo.Paste(dataFormat);
     }
      
    }
    catch (Exception exc)
    {
     MessageBox.Show("圖片失敗。" + exc.Message, "提示",
         MessageBoxButtons.OK, MessageBoxIcon.Information);
    }

   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 刪除
 /// </summary>
 public class DelRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   rtbInfo.SelectedText = "";
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 查找
 /// </summary>
 public class SearchRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   string find = rtbInfo.Tag.ToString();
   int index= rtbInfo.Find(find, 0,RichTextBoxFinds.None);
   int startPos = index;
   int nextIndex = 0;
   while (nextIndex != startPos)//循環(huán)查找字符串，并用藍(lán)色加粗12號(hào)Times New Roman標(biāo)記之 
   {
    rtbInfo.SelectionStart = index;
    rtbInfo.SelectionLength = find.Length;
    rtbInfo.SelectionColor = Color.Blue;
    rtbInfo.SelectionFont = new Font("Times New Roman", (float)12, FontStyle.Bold);
    rtbInfo.Focus();
    nextIndex = rtbInfo.Find(find, index + find.Length, RichTextBoxFinds.None);
    if (nextIndex == -1)//若查到文件末尾，則充值nextIndex為初始位置的值，使其達(dá)到初始位置，順利結(jié)束循環(huán)，否則會(huì)有異常。 
    {
     nextIndex = startPos;
    }
    index = nextIndex;
   }
   rtbInfo.Focus();
  }
 }

 /// <summary>
 /// 打印
 /// </summary>
 public class PrintRichFormat : BaseRichFormat
 {
  private RichTextBox richTextbox;

  public override void SetFormat(RichTextBox rtbInfo)
  {
   this.richTextbox = rtbInfo;
   PrintDocument pd = new PrintDocument();
   pd.PrintPage += new PrintPageEventHandler(pd_PrintPage);
   // 打印文檔
   pd.Print();
  }

  private void pd_PrintPage(object sender, PrintPageEventArgs ev)
  {
   //ev.Graphics.DrawString(richTextbox.Text);
   //ev.HasMorePages = true;
  }
 }

 /// <summary>
 /// 字體大小
 /// </summary>
 public class FontSizeRichFormat : BaseRichFormat
 {
  public override void SetFormat(RichTextBox rtbInfo)
  {
   string fontSize = rtbInfo.Tag.ToString();
   float fsize = 0.0f;
   if (float.TryParse(fontSize, out fsize)) {
    rtbInfo.SelectionFont = new Font(rtbInfo.Font.FontFamily, fsize, rtbInfo.SelectionFont.Style);
   }
   rtbInfo.Focus();
  }
 }
}

頁面代碼【由于實(shí)現(xiàn)了代碼封裝，所有頁面代碼較少】

using DemoRichText.Model;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DemoRichText
{
 public partial class MainForm : Form
 {
  public MainForm()
  {
   InitializeComponent();
  }
  

  public void btnButtonClick(object sender, EventArgs e) {
   Button btn = (Button)sender;
   BTNType btnType;
   if (Enum.TryParse<BTNType>(btn.Tag.ToString(), out btnType)) {
    if (btnType == BTNType.Search) {
     if (!string.IsNullOrEmpty(this.txtSearch.Text.Trim()))
     {
      this.rtbInfo.Tag = this.txtSearch.Text.Trim();
     }
     else {
      return;
     }
     
    }
    IRichFormat richFomat = RichFormatFactory.CreateRichFormat(btnType);
    richFomat.SetFormat(this.rtbInfo);
   }
  }

  private void combFontSize_SelectedIndexChanged(object sender, EventArgs e)
  {
   float fsize = 12.0f;
   if (combFontSize.SelectedIndex > -1) {
    if (float.TryParse(combFontSize.SelectedItem.ToString(), out fsize)) {
     rtbInfo.Tag = fsize.ToString();
     IRichFormat richFomat = RichFormatFactory.CreateRichFormat(BTNType.FontSize);
     richFomat.SetFormat(this.rtbInfo);
    }
    return;
   }
  }
 }
}

RichTextBox是一個(gè)功能豐富的控件，值得學(xué)習(xí)。

點(diǎn)擊文末原文地址下載源碼。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。