Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Programming > Java > Detecting Mouse Over Tab on JTabbedPane

Reply
Thread Tools

Detecting Mouse Over Tab on JTabbedPane

 
 
Hal Vaughan
Guest
Posts: n/a
 
      09-03-2006
I tried finding this and hope I've missed the obvious or that it's something
easy I just didn't find.

I know I can set tool tips for a tab on a JTabbedPane object. I'd like to
have a "help" JTextArea off to the side of my main interface to use to
provide more info than I can in a tool tip. Ideally, when the user puts
the mouse pointer over a tab, I'd like to have a listener that will detect
that and change the text in the help section. In other words, I need to be
able to make an actionlistener that will know when the pointer is over a
tab (not when it changes or is clicked on).

Is that possible?

Thanks!

Hal
 
Reply With Quote
 
 
 
 
Michael Rauscher
Guest
Posts: n/a
 
      09-03-2006
Hal Vaughan schrieb:
> I tried finding this and hope I've missed the obvious or that it's something
> easy I just didn't find.
>
> I know I can set tool tips for a tab on a JTabbedPane object. I'd like to
> have a "help" JTextArea off to the side of my main interface to use to
> provide more info than I can in a tool tip. Ideally, when the user puts
> the mouse pointer over a tab, I'd like to have a listener that will detect
> that and change the text in the help section. In other words, I need to be
> able to make an actionlistener that will know when the pointer is over a
> tab (not when it changes or is clicked on).
>
> Is that possible?


Sure. It's a MouseMotionListener you'll have to add to the JTabbedPane
instance, e. g. something like this one:

MouseMotionListener listener = new MouseMotionAdapter() {
private int oldIx = -1;

public void mouseMoved( MouseEvent e ) {
JTabbedPane tp = (JTabbedPane)e.getSource();
int ix = tp.indexAtLocation( e.getX(), e.getY() );

if ( ix == oldIx )
return;

oldIx = ix;

if ( ix == -1 )
return;

doSomethingUseful();
}
};


Bye
Michael
 
Reply With Quote
 
 
 
 
Hal Vaughan
Guest
Posts: n/a
 
      09-03-2006
Michael Rauscher wrote:

> Hal Vaughan schrieb:
>> I tried finding this and hope I've missed the obvious or that it's
>> something easy I just didn't find.
>>
>> I know I can set tool tips for a tab on a JTabbedPane object. I'd like
>> to have a "help" JTextArea off to the side of my main interface to use to
>> provide more info than I can in a tool tip. Ideally, when the user puts
>> the mouse pointer over a tab, I'd like to have a listener that will
>> detect
>> that and change the text in the help section. In other words, I need to
>> be able to make an actionlistener that will know when the pointer is over
>> a tab (not when it changes or is clicked on).
>>
>> Is that possible?

>
> Sure. It's a MouseMotionListener you'll have to add to the JTabbedPane
> instance, e. g. something like this one:
>
> MouseMotionListener listener = new MouseMotionAdapter() {
> private int oldIx = -1;
>
> public void mouseMoved( MouseEvent e ) {
> JTabbedPane tp = (JTabbedPane)e.getSource();
> int ix = tp.indexAtLocation( e.getX(), e.getY() );
>
> if ( ix == oldIx )
> return;
>
> oldIx = ix;
>
> if ( ix == -1 )
> return;
>
> doSomethingUseful();
> }
> };
>
>
> Bye
> Michael


I tried adding this like this:

addMouseMotionListener(new MouseMotionAdapter() {...});

(The ... contained all the code above.) I replaced "doSomethingUseful()"
with "System.out.println("Tab index: " + ix)" and it never printed
anything, so I finally added "System.out.println("Movement...");" before
the line to get the JTabbedPane from the event and never got a printout
from there.

Is there another step I need to do to make sure I actually get the info or
that the listener is called?

Thanks!

Hal
 
Reply With Quote
 
Michael Rauscher
Guest
Posts: n/a
 
      09-03-2006
Hi,

Hal Vaughan schrieb:
>
> (The ... contained all the code above.) I replaced "doSomethingUseful()"
> with "System.out.println("Tab index: " + ix)" and it never printed
> anything, so I finally added "System.out.println("Movement...");" before
> the line to get the JTabbedPane from the event and never got a printout
> from there.


Most probably didn't add the mouse motion listener to the tabbed pane...

import java.awt.event.*;
import javax.swing.*;

public class Test {
private MouseMotionListener listener = new MouseMotionAdapter() {
private int oldIx = -1;

public void mouseMoved( MouseEvent e ) {
JTabbedPane tp = (JTabbedPane)e.getSource();
int ix = tp.indexAtLocation( e.getX(), e.getY() );

if ( ix == oldIx )
return;

oldIx = ix;

if ( ix == -1 )
return;

System.out.println("You're over tab " + ix );
}
};

private void createAndShowGUI() {
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addMouseMotionListener( listener );

tabbedPane.addTab( "Tab 1", new JPanel() );
tabbedPane.addTab( "Tab 2", new JPanel() );

JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
frame.getContentPane().add( tabbedPane );
frame.pack();
frame.setVisible(true);
}

public static final void main( String args[] ) {
new Test().createAndShowGUI();
}
}

Bye
Michael
 
Reply With Quote
 
Hal Vaughan
Guest
Posts: n/a
 
      09-03-2006
Hal Vaughan wrote:

> Michael Rauscher wrote:
>
>> Hal Vaughan schrieb:
>>> I tried finding this and hope I've missed the obvious or that it's
>>> something easy I just didn't find.
>>>
>>> I know I can set tool tips for a tab on a JTabbedPane object. I'd like
>>> to have a "help" JTextArea off to the side of my main interface to use
>>> to
>>> provide more info than I can in a tool tip. Ideally, when the user puts
>>> the mouse pointer over a tab, I'd like to have a listener that will
>>> detect
>>> that and change the text in the help section. In other words, I need to
>>> be able to make an actionlistener that will know when the pointer is
>>> over a tab (not when it changes or is clicked on).
>>>
>>> Is that possible?

>>
>> Sure. It's a MouseMotionListener you'll have to add to the JTabbedPane
>> instance, e. g. something like this one:
>>
>> MouseMotionListener listener = new MouseMotionAdapter() {
>> private int oldIx = -1;
>>
>> public void mouseMoved( MouseEvent e ) {
>> JTabbedPane tp = (JTabbedPane)e.getSource();
>> int ix = tp.indexAtLocation( e.getX(), e.getY() );
>>
>> if ( ix == oldIx )
>> return;
>>
>> oldIx = ix;
>>
>> if ( ix == -1 )
>> return;
>>
>> doSomethingUseful();
>> }
>> };
>>
>>
>> Bye
>> Michael

>
> I tried adding this like this:
>
> addMouseMotionListener(new MouseMotionAdapter() {...});
>
> (The ... contained all the code above.) I replaced "doSomethingUseful()"
> with "System.out.println("Tab index: " + ix)" and it never printed
> anything, so I finally added "System.out.println("Movement...");" before
> the line to get the JTabbedPane from the event and never got a printout
> from there.
>
> Is there another step I need to do to make sure I actually get the info or
> that the listener is called?


Nevermind this last part. I was using an example I downloaded from online
for a quick JTabbedPane example and between cutting and pasting in my
browser to my editor, the indentation got messed up and I lost track of
which object I was adding the listener to. (HINT: Never name objects, even
in short code, "myObject" or something too generic and always keep
indentations lined up!)

Okay, I had seen the indication of indexAtLocation(), but misunderstood it.
I thought it would report the entire pane and not just a tab, which would
be useless, since whenever the mouse was over the pane, it would report the
number of the active pane. I was also hoping there would be something a
bit more direct, but this works perfectly. It only reports anything when
the pointer is directly over a tab, or a -1 if it's not over one. I
changed the method to:

int lastIdx = -1;
JLabel tabIndex = new JLabel("");

public void mouseMoved( MouseEvent e ) {
JTabbedPane tp = (JTabbedPane)e.getSource();
int idx = tp.indexAtLocation( e.getX(), e.getY() );
if (idx == lastIdx) return;
tabIndex.setText(String.valueOf(idx));
return;
}

I also just added "implements MouseMotionListener" to the main class I was
using and added a mouseDragged() method so that'd work so it'd all be in
one class and the variables and components were easier to track.

This works as a dry run for what I want to do because it changes the text of
a component to something specific based on the tab the cursor is over.
When I get the real thing working, I'll make the JTextArea I'm using for a
help section start with the help text for the default selected panel. That
way the user has instant help and the help will change whenever they change
the tab or mouse over one to change it.

Thanks for the help! This does exactly what I wanted and is easy to
implement.

Hal
 
Reply With Quote
 
Michael Rauscher
Guest
Posts: n/a
 
      09-03-2006
Hal Vaughan schrieb:
>
> I also just added "implements MouseMotionListener" to the main class I was
> using and added a mouseDragged() method so that'd work so it'd all be in
> one class and the variables and components were easier to track.


I'd suggest to create a separate class for that job - without any
components. This way you can reuse it easily.

Bye
Michael
 
Reply With Quote
 
 
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Re: is folding JTabbedPane tab "tips" possible? Kent Paul Dolan Java 1 12-21-2005 07:32 PM
JTabbedPane: how best to identify clicked tab Scott Steiner Java 2 05-15-2005 10:59 PM
Access swing component on other tab of JTabbedPane Mike Bosschaert Java 0 01-07-2005 02:14 PM
How to open a JPopupMenu on the title of a Tab in the JTabbedPane Vincent Cantin Java 3 08-06-2004 02:23 AM
JTabbedPane and active tab vertigo Java 1 05-13-2004 11:30 AM



Advertisments