ScintillaNET的應用

　　出於工作需要，需要製作一個嵌入在桌面應用中的C語言編輯器，經過一系列調研，目前ScintillaNET應該是最合適的了，開源、輕便、功能豐富，但是踩得坑也很多，接下麵一一說道。

　　目前ScintillaNET托管在https://github.com/jacobslusser/ScintillaNET，拉下來重新編譯。由於需要移植到.NET 2.0的平臺上，需要修改源碼中的對Linq的依賴，這裡不多說，把目標框架改為.NET 2.0，編譯，哪裡報錯改哪裡。

1. 編輯器風格

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

2. 括弧的匹配和高亮

為了方便多處調用該控制項，繼承Scintilla類，實現“自定義”控制項，以下均以這種做法來實現功能。

重寫OnUpdateUI事件，在UpdateUI中實現括弧匹配功能。

 1 private int m_lastCaretPos =0;
 2 protected override void OnUpdateUI(UpdateUIEventArgs e)
 3 {
 4     base.OnUpdateUI(e);
 5     MatchAndLightBracket();
 6 }
 7 private void MatchAndLightBracket()
 8  {
 9     // Has the caret changed position?
10     int caretPos = this.CurrentPosition;
11     if (m_lastCaretPos != caretPos)
12     {
13         m_lastCaretPos = caretPos;
14         int bracePos1 = -1;
15         int bracePos2 = -1;
16 
17         // Is there a brace to the left or right?
18         if (caretPos > 0 && IsBrace(this.GetCharAt(caretPos - 1)))
19              bracePos1 = (caretPos - 1);
20         else if (IsBrace(this.GetCharAt(caretPos)))
21              bracePos1 = caretPos;
22 
23         if (bracePos1 >= 0)
24         {
25              // Find the matching brace
26              bracePos2 = this.BraceMatch(bracePos1);
27              if (bracePos2 == CodeEditor.InvalidPosition)
28              {
29                   ReleaseHighlightB();
30              }
31               else
32               {
33                    ReleaseHighlightB();
34                    HighlightBracket(bracePos1);
35                    HighlightBracket(bracePos2);
36               }
37          }
38          else
39          {
40                 ReleaseHighlightB();
41          }
42     }
43 }
44 private void HighlightBracket(int pos)
45 {
46     if (pos < 0)
47         return;
48     this.IndicatorFillRange(pos, 1);
49 }
50 private void ReleaseHighlightB()
51 {
52     this.IndicatorClearRange(0, this.TextLength);
53 }
54 private static bool IsBrace(int c)
55 {
56     switch (c)
57     {
58         case '(':
59         case ')':
60         case '[':
61         case ']':
62         case '{':
63         case '}':
64         case '<':
65         case '>':
66             return true;
67     }
68 
69     return false;
70 }

3. Ctrl+Z會一次性清空所有的修改

 1 protected override void OnBeforeInsert(BeforeModificationEventArgs e)
 2 {
 3     base.OnBeforeInsert(e);
 4     Count = this.Text.Length;
 5     this.BeginUndoAction();
 6 }
 7 protected override void OnInsert(ModificationEventArgs e)
 8 {
 9     base.OnInsert(e);
10     if (Count < this.Text.Length)
11         this.EndUndoAction(); 
12 }

4.縮進調整

 1 protected override void OnCharAdded(CharAddedEventArgs e)
 2 {
 3     base.OnCharAdded(e);
 4     AutoIndicator();
 5 }
 6 private void AutoIndicator()
 7 {
 8     int pos = this.CurrentPosition;
 9     if (pos > 3 && this.GetCharAt(pos - 1) == '\n' && this.GetCharAt(pos - 2) == '\r')
10     {
11         if (this.GetCharAt(pos - 3) == '{')
12         {
13             string[] Text = GetStringList();
14             string line = Text[this.CurrentLine - 1];
15             int start = line.IndexOf(line.TrimStart());
16             string ss = line.Substring(0, start);
17             string str = new string(' ',4);
18             this.InsertText(pos, ss+str);
19             this.SelectionStart = this.SelectionEnd = pos + ss.Length + 4;
20         }
21         else
22         {
23             string[] Text = GetStringList();
24             string line = Text[this.CurrentLine - 1];
25             int start = line.IndexOf(line.TrimStart());
26             string ss = line.Substring(0, start);
27             this.InsertText(pos, ss);
28             this.SelectionStart = this.SelectionEnd = pos + ss.Length;
29         }
30 
31     }
32 }
33 private string[] GetStringList()
34 {
35     string[] s = new string[] { "\n" };
36     return this.Text.Split(s, StringSplitOptions.None);
37 }

目前整理了這麼多，有機會再繼續深入理解和應用ScintillaNET。