How to Eliminate RichTextBox Flickering During Syntax Highlighting?
Jan 06, 2025 am 02:52 AM
Disabling Repaint for RichTextBox Syntax Highlighting
When performing syntax highlighting in a RichTextBox during user input, resolving flickering requires disabling repainting.
Current Inefficient Solution
The current solution involves overriding the "WndProc" function to intercept and suppress repaint messages. However, this approach is not practical for external functions working with a provided RichTextBox.
Overcoming the Oversight
A more effective approach is to add the missing BeginUpdate and EndUpdate methods to the RichTextBox class. These methods generate the WM_SETREDRAW message to suppress repainting.
Adding the Methods
Create a new class in your project with the following code:
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
class MyRichTextBox : RichTextBox {
public void BeginUpdate() {
SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)0, IntPtr.Zero);
}
public void EndUpdate() {
SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)1, IntPtr.Zero);
this.Invalidate();
}
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
private const int WM_SETREDRAW = 0x0b;
}
Usage
You can now use these methods to disable and enable repainting within your syntax highlighting function.
Alternative Solution
If adding the methods to the class is not possible, you can also use the P/Invoke "SendMessage" function directly before and after updating the text.
SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)0, IntPtr.Zero); // Disable repainting // Update text SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)1, IntPtr.Zero); // Enable repainting this.Invalidate();
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