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Disable RichTextBox zooming while scrolling with ctrl key

I am using RichTextBox in my c# application, I want to disable RichTextBox zooming while scrolling cursor with ctrl key, How to disable this? Please help.

2 Answers
2

You could override the WndProc of a custom RichTextBox control and filter the WM_MOUSEWHEEL Message. Then re-define the wParam content value (this value reports which combination of mouse buttons are pressed at that time), setting it to 0 (IntPtr.Zero).

RichTextBox

WM_MOUSEWHEEL

wParam

0

IntPtr.Zero

Then, let know that you processed this message, returning a m.Result of 0 (IntPtr.Zero).

(See the Docs on the WM_MOUSEWHEEL message about this).

m.Result

0

IntPtr.Zero

WM_MOUSEWHEEL

To test it, create a new Class and substitute its content with this code (except the Namespace). Build the Solution/Project. Find the RTBNoZoom control in your ToolBox and drop it on a Form.

Namespace

RTBNoZoom

using System;
using System.Windows.Forms;

public class RTBNoZoom : RichTextBox

private const int MK_CONTROL = 0x0008;
private const int WM_MOUSEWHEEL = 0x020A;

public RTBNoZoom()

protected override void WndProc(ref Message m)

switch (m.Msg)

case WM_MOUSEWHEEL:
if (((int)m.WParam & MK_CONTROL) == MK_CONTROL)

m.WParam = IntPtr.Zero;
m.Result = IntPtr.Zero;

break;
default:
break;

base.WndProc(ref m);




You can use the MOUSEWHEEL command and control.modifiers properties to control the zooming of your application.

protected override void DefWndProc(ref Message m)

if (m.Msg == WM_MOUSEWHEEL && Control.ModifierKeys == Keys.Control)

// Do what you want here

else

base.DefWndProc(ref m);




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