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POAvoid Scanning EntireRichtextbox Highlighting
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  1. POAvoid Scanning EntireRichtextbox Highlighting
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    copied!<p>im working on a code editor and i came up with this set of codes:</p> <pre><code>public class Test2 : Form { RichTextBox m_rtb = null; public static void Main() { Application.Run(new Test2()); } public Test2() { Text = "Test2"; ClientSize = new Size(400, 400); m_rtb = new RichTextBox(); m_rtb.Multiline = true; m_rtb.WordWrap = false; m_rtb.AcceptsTab = true; m_rtb.ScrollBars = RichTextBoxScrollBars.ForcedBoth; m_rtb.Dock = DockStyle.Fill; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Regular); m_rtb.SelectionColor = Color.Black; Controls.Add(m_rtb); Parse(); m_rtb.TextChanged += new EventHandler(this.TextChangedEvent); } void Parse() { String inputLanguage = "// Comment.\n" + "using System;\n" + "\n" + "public class Stuff : Form { \n" + " public static void Main(String args) {\n" + " }\n" + "}\n" ; // Foreach line in input, // identify key words and format them when adding to the rich text box. Regex r = new Regex("\\n"); String [] lines = r.Split(inputLanguage); foreach (string l in lines) { ParseLine(l); } } void ParseLine(string line) { Regex r = new Regex("([ \\t{}();])"); String [] tokens = r.Split(line); foreach (string token in tokens) { // Set the token's default color and font. m_rtb.SelectionColor = Color.Black; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Regular); // Check for a comment. if (token == "//" || token.StartsWith("//")) { // Find the start of the comment and then extract the whole comment. int index = line.IndexOf("//"); string comment = line.Substring(index, line.Length - index); m_rtb.SelectionColor = Color.LightGreen; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Regular); m_rtb.SelectedText = comment; break; } // Check whether the token is a keyword. String [] keywords = { "public", "void", "using", "static", "class" }; for (int i = 0; i &lt; keywords.Length; i++) { if (keywords[i] == token) { // Apply alternative color and font to highlight keyword. m_rtb.SelectionColor = Color.Blue; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Bold); break; } } m_rtb.SelectedText = token; } m_rtb.SelectedText = "\n"; } private void TextChangedEvent(object sender, EventArgs e) { // Calculate the starting position of the current line. int start = 0, end = 0; for (start = m_rtb.SelectionStart - 1; start &gt; 0; start--) { if (m_rtb.Text[start] == '\n') { start++; break; } } // Calculate the end position of the current line. for (end = m_rtb.SelectionStart; end &lt; m_rtb.Text.Length; end++) { if (m_rtb.Text[end] == '\n') break; } // Extract the current line that is being edited. String line = m_rtb.Text.Substring(start, end - start); // Backup the users current selection point. int selectionStart = m_rtb.SelectionStart; int selectionLength = m_rtb.SelectionLength; // Split the line into tokens. Regex r = new Regex("([ \\t{}();])"); string [] tokens = r.Split(line); int index = start; foreach (string token in tokens) { // Set the token's default color and font. m_rtb.SelectionStart = index; m_rtb.SelectionLength = token.Length; m_rtb.SelectionColor = Color.Black; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Regular); // Check for a comment. if (token == "//" || token.StartsWith("//")) { // Find the start of the comment and then extract the whole comment. int length = line.Length - (index - start); string commentText = m_rtb.Text.Substring(index, length); m_rtb.SelectionStart = index; m_rtb.SelectionLength = length; m_rtb.SelectionColor = Color.LightGreen; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Regular); break; } // Check whether the token is a keyword. String [] keywords = { "public", "void", "using", "static", "class" }; for (int i = 0; i &lt; keywords.Length; i++) { if (keywords[i] == token) { // Apply alternative color and font to highlight keyword. m_rtb.SelectionColor = Color.Blue; m_rtb.SelectionFont = new Font("Courier New", 10, FontStyle.Bold); break; } } index += token.Length; } // Restore the users current selection point. m_rtb.SelectionStart = selectionStart; m_rtb.SelectionLength = selectionLength; } } </code></pre> <p>problem was everytime i press space keys or type the entire code editor keeps on scanning like searching on what to highlight and i find it a bit annoying ... </p> <p>so i just want to ask for possible solution about this ... to avoid highlighting of whole richtextbox like scanning what to highlight next .</p> <p>thanks a lot in advance for the help! more power!</p>
 

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