views:

126

answers:

2

This may be a stupid question, but I have to ask!

I have the following code snippets that are supposed to run their corresponding methods when the user interacts with objects. For some reason, "foo" is never printed, but "bar" is.

myJSpinner1.addMouseListener(new java.awt.event.MouseAdapter() {
    public void mouseEntered(java.awt.event.MouseEvent evt) {
    System.out.println("foo"); //"foo" is not printed
  }
});

myJSpinner2.addChangeListener(new java.awt.event.ChangeListener() {
    public void stateChanged(java.awt.event.ChangeEvent evt) {
    System.out.println("bar"); //"bar" is printed
  }
});

I get no exceptions or stack trace. What am I missing in the MouseListener one? Thanks in advance.

EDIT: MouseEntered works perfectly on a JCheckBox implemented in exactly the same way!

+2  A: 

This is a guess but I suspect you need to add a MouseListener to the JSpinner's editor (via a call to getEditor()). I imagine that the editor Component occupies all available space within the JSpinner and is therefore intercepting all MouseEvents.

Adamski
Thanks for your answer. Is this what you mean? senseSpinner.getEditor().addMouseListener(new MouseAdapter(){...})' That doesn't seem to work either. The funny thing is, this code was generated using NetBeans and so in theory, should work!
billynomates
Yes that's what I meant. Actually, you could try adding the listener to the editor's text field by calling ((JSpinner.DefaultEditor)spinner.getEditor()).getTextField().addMouseListener(...).
Adamski
Nope, same thing happens. Namely, nothing!
billynomates
+2  A: 

JSpinner is a composite component consisting of a text field and 2 buttons. It's possible to add mouse listeners to all of those by iterating over the results of getComponents() and adding a listener to each.

However, in my experience, when something takes that much work, you're probably going about it the wrong way.

Why do you need the mouse-entered information for a JSpinner?
What do you want to do with this event?

Update: If you're looking to supply information about all of the controls in your panel, you may want to look at using a glasspane to detect the component under the mouse.

A Well-behaved Glasspane by Alexander Potochkin is a good place to start.

Devon_C_Miller
I have another component in which I want to display text which explains what the spinner does. Like a statusbar, I suppose!
billynomates
Perhaps consider using a tooltip instead of showing the function in the status bar?
Adamski
I had considered that, but I need to use tooltips elsewhere for other reasons and for the sake on consistency, I'l rather use this. Surely this is something stupid that I've missed out? I can't see why it would work on other components and not spinners?
billynomates
OK, thanks for the advice. I'll try it out and let you know!
billynomates
Iterating over the results of getComponents() works, but only for the buttons, not the text field! Weird, but it'll have to do. Thanks.
billynomates