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。

 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 }

view code

3. ctrl+z会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 }

view code

4.缩进调整

 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 }

view code

目前整理了这么多，有机会再继续深入理解和应用scintillanet。