How to disable the native context menu in CefSharp

Steps to Disable the Native Context Menu in CefSharp

1. Create a Custom Menu Handler Class

You need to create a custom class that implements the IContextMenuHandler interface, which provides the methods necessary to control the context menu behavior.

using CefSharp;

public class MyCustomMenuHandler : IContextMenuHandler
{
    // Clears the default context menu before it's shown
    public void OnBeforeContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model)
    {
        model.Clear(); // This removes all the default items from the menu
    }

    // This method is triggered when a context menu command is selected
    public bool OnContextMenuCommand(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, CefMenuCommand commandId, CefEventFlags eventFlags)
    {
        return false; // Returns false to indicate the command is not executed
    }

    // This method is triggered when the context menu is dismissed
    public void OnContextMenuDismissed(IWebBrowser browserControl, IBrowser browser, IFrame frame)
    {
        // No action is required here
    }

    // Prevents the context menu from being shown
    public bool RunContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model, IRunContextMenuCallback callback)
    {
        return false; // Returning false prevents the menu from being displayed
    }
}

2. Set the Custom Menu Handler on the ChromiumWebBrowser

Once the custom menu handler class is created, you need to set it as the default context menu handler for the ChromiumWebBrowser instance.

CefSettings settings = new CefSettings();
// Initialize CefSharp with the settings
Cef.Initialize(settings);

// Create the ChromiumWebBrowser instance
ChromiumWebBrowser chromeBrowser = new ChromiumWebBrowser("www.somewebsite.com");

// Assign the custom menu handler to the browser instance
chromeBrowser.MenuHandler = new MyCustomMenuHandler();

// Add the browser control to your form or container
this.Controls.Add(chromeBrowser);

In this example:

• OnBeforeContextMenu: This method is called before the context menu is shown. By calling model.Clear(), you remove all default context menu items.
• OnContextMenuCommand: This method handles the actions taken when a menu item is clicked. Returning false ensures no action is executed.
• OnContextMenuDismissed: This method is triggered when the context menu is dismissed, but you don’t need to add any code here if you don’t want to handle that event.
• RunContextMenu: Returning false here stops the context menu from being shown entirely.

By implementing and assigning a custom IContextMenuHandler, you can easily disable the native context menu in CefSharp, giving you complete control over the right-click behavior in your application.