itemevents.html

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<TITLE>Firing Item Events
(Java Developers Almanac Example)
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  <h3>
    e695.  
    Firing Item Events</h3>

An object wishing to fire item events must implement <code>ItemSelectable</code>.
This example shows typical code that an object must implement to
fire item events. When an item event is to be fired, <code>fireItemEvent()</code>
should be called.


<pre>
    public class <font color="#0066ff"><i>ItemEvents</i></font> implements ItemSelectable {
        protected EventListenerList listenerList = new EventListenerList();
    
        public Object[] getSelectedObjects() {
            return <font color="#0066ff"><i>selectedObjects</i></font>;
        }
    
        public void addItemListener(ItemListener l) {
            listenerList.add(ItemListener.class, l);
        }
    
        public void removeItemListener(ItemListener l) {
            listenerList.remove(ItemListener.class, l);
        }
    
        void fireItemEvent(int selected) {
            ItemEvent evt = null;
            Object[] listeners = listenerList.getListenerList();
    
            for (int i=0; i&lt;listeners.length-2; i+=2) {
                if (listeners[i] == ItemListener.class) {
                    if (evt == null) {
                        evt = new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED,
                            this, selected);
                    }
                    ((ItemListener)listeners[i+1]).itemStateChanged(evt);
                }
            }
        }
    }
</pre>

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