#587 – The Purpose of Tunneling and Bubbling Events

Many predefined routed events in WPF are available as pairs of events–one tunneling and one bubbling.  The tunneling event typically fires first.  E.g. PreviewKeyDown and KeyDown.

Tunneling events are useful if you want to do some filtering out of different events, for example filtering out disallowed keystrokes.  This might be useful to do in a higher-level parent control, so lower level controls like buttons don’t have to all deal with the invalid input.

 

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: