Examples of org.eclipse.jface.util.ListenerList

org.eclipse.jface.util.ListenerList
This class is used to maintain a list of listeners, and is used in the implementations of several classes within JFace which allow you to register listeners of various kinds. It is a fairly lightweight object, occupying minimal space when no listeners are registered.
Note that the add method checks for and eliminates duplicates based on identity (not equality). Likewise, the remove method compares based on identity.

Use the getListeners method when notifying listeners. Note that no garbage is created if no listeners are registered. The recommended code sequence for notifying all registered listeners of say, FooListener.eventHappened, is:
```
 Object[] listeners = myListenerList.getListeners(); for (int i = 0; i < listeners.length; ++i) { ((FooListener) listeners[i]).eventHappened(event); } 
```
@deprecated Please use {@link org.eclipse.core.runtime.ListenerList} instead.Please note that the {@link #ListenerList(int)} and{@link org.eclipse.core.runtime.ListenerList#ListenerList(int)}constructors have different semantics. Please read the javadoc carefully. Also note that the equivalent of {@link #ListenerList()} is actually{@link org.eclipse.core.runtime.ListenerList#ListenerList(int)}with {@link org.eclipse.core.runtime.ListenerList#IDENTITY} asthe argument.

                    public void selectionChanged(SelectionChangedEvent event) {
                    }
                };


        manager.addSelectionChangedListener(listener);
        ListenerList listeners = getSelectionChangedListenersList();
        assertNotNull(listeners);
        assertEquals("List size should match", 1, listeners.size());




        manager.removeSelectionChangedListener(listener);
        listeners = getSelectionChangedListenersList();
        assertNotNull(listeners);
        assertTrue("List should be empty", listeners.isEmpty());


        // Removing the same listener again shouldn't change the size or
        // cause any exceptions.
        manager.removeSelectionChangedListener(listener);
        listeners = getSelectionChangedListenersList();
        assertNotNull(listeners);
        assertTrue("List should be empty", listeners.isEmpty());
    }

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        super(parent, SWT.NONE);
        this.duplicatesAllowed = duplicatesAllowed;
        this.parser = (parser == null) ? DEFAULT_PARSER : parser;
        createControl(style, title, items, editable, factory);


        listeners = new ListenerList();


        validatorTask = new ValidatorTaskExecutor();
        validatorTask.start();


        updateButtons();

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     * @param parent the parent Composite
     * @param style the style for the parent
     */
    public FontSelector(Composite parent, int style) {
        super(parent, style);
        listeners = new ListenerList();
        createSelector();
        initAccessible();
    }

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     * @param style the style
     */
    public ColorButton(Composite parent, int style) {
        super(parent, style);
        addButton(style);
        listeners = new ListenerList();
        initAccessible();
    }

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  }


  private ListenerList fListeners;


  public ProblemMarkerManager() {
    fListeners = new ListenerList(10);
  }

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