CODEWITHSUNDEEP
c#.netscrollpanelmousewheel
Molion
Molion

Reputation: 21

c# - prevent mousewheel scrolling in panel

I want to prevent scrolling with the mousewheel in a panel with a scrollbar, how can ido this?

I have seen this suggested, but it's not working:

panel.MouseWheel += new MouseEventHandler(MouseWheel);

void MouseWheel(object sender, MouseEventArgs e) {
  ((HandledMouseEventArgs)e).Handled = true;
}

Upvotes: 2

Views: 2613

Answers (3)

Ryan Chon Shinn
Ryan Chon Shinn

Reputation: 1

chatGPT helped me. Use NativeWindow.

using System;
using System.Windows.Forms;

public class MyForm : Form
{
    private Panel myPanel;
    private PanelNoScrollNativeWindow noScrollWindow;

    public MyForm()
    {
        myPanel = new Panel();
        myPanel.Dock = DockStyle.Fill;
        myPanel.AutoScroll = true;

        // Add some content to the panel
        for (int i = 0; i < 20; i++)
        {
            var label = new Label
            {
                Text = $"Label {i + 1}",
                AutoSize = true,
                Location = new System.Drawing.Point(10, i * 30)
            };
            myPanel.Controls.Add(label);
        }

        // Subclass the panel's window procedure
        noScrollWindow = new PanelNoScrollNativeWindow(myPanel);

        this.Controls.Add(myPanel);
        this.Text = "No Scroll Panel Example";
        this.Size = new System.Drawing.Size(300, 300);
    }

    // NativeWindow class to handle the panel's window procedure
    private class PanelNoScrollNativeWindow : NativeWindow
    {
        private const int WM_MOUSEWHEEL = 0x020A;

        public PanelNoScrollNativeWindow(Control control)
        {
            AssignHandle(control.Handle);
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_MOUSEWHEEL)
            {
                // Suppress the mouse wheel message
                return;
            }

            base.WndProc(ref m);
        }
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MyForm());
    }
}

Upvotes: 0

LarsTech
LarsTech

Reputation: 81675

Try inheriting your own Panel and just comment out the OnMouseWheel call:

public class WheelessPanel : Panel {
  protected override void OnMouseWheel(MouseEventArgs e) {
    // base.OnMouseWheel(e);
  }
}

Upvotes: 5

simon at rcl
simon at rcl

Reputation: 7344

If you provide a user with a scrollable control, why would you then prevent them from scrolling it? If you don't want them to scroll, don't give them scroll bars.

If I came across a UI like that I would dislike it and only use it if I absolutely had to.

Upvotes: -3

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