ScintillaNET的应用

　　出于工作需要，需要制作一个嵌入在桌面应用中的C语言编辑器，经过一系列调研，目前ScintillaNET应该是最合适的了，开源、轻便、功能丰富，但是踩得坑也很多，接下面一一说道。

　　目前ScintillaNET托管在https://github.com/jacobslusser/ScintillaNET，拉下来重新编译。由于需要移植到.NET 2.0的平台上，需要修改源码中的对Linq的依赖，这里不多说，把目标框架改为.NET 2.0，编译，哪里报错改哪里。

1. 编辑器风格

参考：https://github.com/robinrodricks/ScintillaNET.Demo

2. 括号的匹配和高亮

为了方便多处调用该控件，继承Scintilla类，实现“自定义”控件，以下均以这种做法来实现功能。

重写OnUpdateUI事件，在UpdateUI中实现括号匹配功能。

 private int m_lastCaretPos =;
 protected override void OnUpdateUI(UpdateUIEventArgs e)
 {
     base.OnUpdateUI(e);
     MatchAndLightBracket();
 }
 private void MatchAndLightBracket()
  {
     // Has the caret changed position?
     int caretPos = this.CurrentPosition;
     if (m_lastCaretPos != caretPos)
     {
         m_lastCaretPos = caretPos;
         int bracePos1 = -;
         int bracePos2 = -;

         // Is there a brace to the left or right?
         if (caretPos >  && IsBrace(this.GetCharAt(caretPos - )))
              bracePos1 = (caretPos - );
         else if (IsBrace(this.GetCharAt(caretPos)))
              bracePos1 = caretPos;

         if (bracePos1 >= )
         {
              // Find the matching brace
              bracePos2 = this.BraceMatch(bracePos1);
              if (bracePos2 == CodeEditor.InvalidPosition)
              {
                   ReleaseHighlightB();
              }
               else
               {
                    ReleaseHighlightB();
                    HighlightBracket(bracePos1);
                    HighlightBracket(bracePos2);
               }
          }
          else
          {
                 ReleaseHighlightB();
          }
     }
 }
 private void HighlightBracket(int pos)
 {
     if (pos < )
         return;
     this.IndicatorFillRange(pos, );
 }
 private void ReleaseHighlightB()
 {
     this.IndicatorClearRange(, this.TextLength);
 }
 private static bool IsBrace(int c)
 {
     switch (c)
     {
         case '(':
         case ')':
         case '[':
         case ']':
         case '{':
         case '}':
         case '<':
         case '>':
             return true;
     }

     return false;
 }

3. Ctrl+Z会一次性清空所有的修改

 protected override void OnBeforeInsert(BeforeModificationEventArgs e)
 {
     base.OnBeforeInsert(e);
     Count = this.Text.Length;
     this.BeginUndoAction();
 }
 protected override void OnInsert(ModificationEventArgs e)
 {
     base.OnInsert(e);
     if (Count < this.Text.Length)
         this.EndUndoAction();
 }

4.缩进调整

 protected override void OnCharAdded(CharAddedEventArgs e)
 {
     base.OnCharAdded(e);
     AutoIndicator();
 }
 private void AutoIndicator()
 {
     int pos = this.CurrentPosition;
     if (pos >  && this.GetCharAt(pos - ) == '\n' && this.GetCharAt(pos - ) == '\r')
     {
         if (this.GetCharAt(pos - ) == '{')
         {
             string[] Text = GetStringList();
             string line = Text[this.CurrentLine - ];
             int start = line.IndexOf(line.TrimStart());
             string ss = line.Substring(, start);
             string str = new string(' ',);
             this.InsertText(pos, ss+str);
             this.SelectionStart = this.SelectionEnd = pos + ss.Length + ;
         }
         else
         {
             string[] Text = GetStringList();
             string line = Text[this.CurrentLine - ];
             int start = line.IndexOf(line.TrimStart());
             string ss = line.Substring(, start);
             this.InsertText(pos, ss);
             this.SelectionStart = this.SelectionEnd = pos + ss.Length;
         }

     }
 }
 private string[] GetStringList()
 {
     string[] s = new string[] { "\n" };
     return this.Text.Split(s, StringSplitOptions.None);
 }

目前整理了这么多，有机会再继续深入理解和应用ScintillaNET。