Databases
StackOverflow2013
Postsdbo
POC#: Changing font style of WinForm RichTextBox without selecting the text
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC#: Changing font style of WinForm RichTextBox without selecting the text
    primarykey
    data
    text
    <p>I am using a <code>RichTextBox</code> in my code where I show syntax-highlighted code. Now, on every keystroke, I have to re-parse all the tokens and re-color them all over again. But the only way to color individual words in a <code>WinForm richtextbox</code> is to select those words one by one and color them using SelectionFont. </p> <p>But if the user is typing really fast, there is a very noticeable flickering caused by my selecting individual words (selected words have that Windows blue-background thing and that is causing the flickering). Is there any way around that where I can color individual words without selecting them (and hence causing that blue highlight around the selected text). I tried using <code>SuspendLayout()</code> to disable rendering during my coloring but that didn't help. Thanks in advance!</p> <p>Here is my code: </p> <p>Code: </p> <pre><code>private void editBox_TextChanged(object sender, EventArgs e) { syntaxHighlightFromRegex(); } private void syntaxHighlightFromRegex() { this.editBox.SuspendLayout(); string REG_EX_KEYWORDS = @"\bSELECT\b|\bFROM\b|\bWHERE\b|\bCONTAINS\b|\bIN\b|\bIS\b|\bLIKE\b|\bNONE\b|\bNOT\b|\bNULL\b|\bOR\b"; matchRExpression(this.editBox, REG_EX_KEYWORDS, KeywordsSyntaxHighlightFont, KeywordSyntaxHighlightFontColor); } private void matchRExpression(RichTextBox textBox, string regexpression, Font font, Color color) { System.Text.RegularExpressions.MatchCollection matches = Regex.Matches(this.editBox.Text, regexpression, RegexOptions.IgnoreCase); foreach (Match match in matches) { textBox.Select(match.Index, match.Length); textBox.SelectionColor = color; textBox.SelectionFont = font; } } </code></pre> <p>Inside the MyRichTextBox (dervied from RichTextBox): </p> <pre><code>public void BeginUpdate() { SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)0, IntPtr.Zero); } public void EndUpdate() { SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)1, IntPtr.Zero); } [DllImport("user32.dll")] private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp); private const int WM_SETREDRAW = 0x0b; </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser1391664
    1. USuser1391664
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    3. VO
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. This table or related slice is empty.
      1. VTUpMod
    1. COCurious: why are you re-parsing EVERYTHING? Why not just parse what's been typed and the things around it?
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. USSimon Whitehead
    2. COCould you show the code you are using to color the words? Are you saying that you programmatically select words and this is causing the blue highlight?
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. USAnssssss
    3. COpossible duplicate of [RichTextBox syntax highlighting in real time--Disabling the repaint](http://stackoverflow.com/questions/3282384/richtextbox-syntax-highlighting-in-real-time-disabling-the-repaint)
      singulars
      1. POC#: Changing font style of WinForm RichTextBox without selecting the text
      1. USHans Passant
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload