Hi,all, I am using a JList and add a ListSelectionListener.But every time I click the item in the JList once,it fires two ListSelectionEvent because the valueChanged() is invoked twice.Anybody know how to fix this? Thank you in advance and May you have a merry Christmas! Frances
Well I experienced a similar problem, so I removed the ListSelectionListener from my JList, instead, I added a JButton to get what I needed, in the actionPerformed() I called the getSelectedIndex() of the JList, to get the value. I don't know if this will help, because I don't know exactly what you are trying to do. but here is a code snipett to help. JList jl = new JList(); c.add(jl); JButton but = new JButton("submit"); but.addActionListener etc... // skip to action performed method. public void actionPerformed(actionEvent e{ variable = JList.getSelectedIndex(); // do stuff Hope it is of some help
The 2 callbacks are the result of the mouse interaction. 1 callback for mouse down 1 callback for mouse up If you are only interested in the mouse up callback then your handler can just check the event flag isAdjusting: true for mouse down, false for mouse up public void valueChanged(ListSelectionEvent evt) { if( !ev.isAdjusting() ) { // perform some work here. } } The above solution has a problem with the 1.2 version of Swing if your list allows multiple selections (CTRL+click). The mouse up for this case doesn't generate therefore your routine will never perform any work. But since you had the multiple callback problem your list is probably SINGLE_SELECTION. Manfred.
Hi,Manfred, I finally set a boolean flag to control it. But your ev.getValueIsAdjusting() is a better,neat idea. I tried and succeeded. Thank you very much! Frances
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