Is there a robust way to detect first responder changes in subviews?

Question

I'm building a custom view that contains several other subviews (NSTextField, WebView,...). I'd like to have my custom view draw a different border when one of the subviews is the first responder, and act as a single item that can be acted upon with menu items and keyboard shortcuts. It looks something like this:

+-------------+
| NSTextField |
+-------------+
| WebView     |
+-------------+

So far, I've had success subclassing NSTextField and others to notify a delegate when - (BOOL)becomeFirstResponder and - (BOOL)resignFirstResponder are called. This approach doesn't work with WebView though, as it itself contains many subviews--I can't subclass them all!

Is there a better way to detect when subviews change their first responder status? Or a better way to create a custom view?

Answer 1

Both WebViewEditingDelegate method will be call,

Resign first responder:

-(void)webViewDidEndEditing:(NSNotification *)notification
{

}

and when become first responder:

-(BOOL)webView:(WebView *)webView shouldBeginEditingInDOMRange:(DOMRange *)range
{
    return YES;
}