Re: how to make Java notice ActionEvent after changing focus?

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 25 Jul 2008 10:25:02 +0100

Message-ID:

<g6c65p$lfg$1@south.jnrs.ja.net>

Mark_Galeck wrote:

Hello, typically with other GUIs (for example MS Windows), if you
edit a text field, you don't have to press Enter for the system to
notice - for example, you can click your mouse on another field, and
the system notices the change.

So does Swing, but you have to register your interest in that change so that you
get notified which doesn't happen by default.

It appears this is not so with Java Swing - I edit the text value in
JTextField, and I have to press Enter for ActionEvent to show up, if I
click on another field, the changed value stays in the text field, but
no ActionEvent is fired. This makes no sense to me !?

Swing is more flexible. ActionEvent is fired when an action occurs, and losing
focus is not an action. If you want to know when the Component loses focus you
register a FocusListener.

How to make ActionEvent fire if I start editing something else??

You can't [directly], but you will receive a FocusEvent if the focus is moved to
another Component and you have registered a FocusListener.

Thank you for your insight,

Mark

--
Nigel Wade