Examples of org.eclipse.jface.util.PropertyChangeEvent

org.eclipse.jface.util.PropertyChangeEvent
An event object describing a change to a named property.
This concrete class was designed to be instantiated, but may also be subclassed if required.

The JFace frameworks contain classes that report property change events for internal state changes that may be of interest to external parties. A special listener interface (IPropertyChangeListener) is defined for this purpose, and a typical class allow listeners to be registered via an addPropertyChangeListener method.
@see IPropertyChangeListener

    protected void fireValueChanged(String property, Object oldValue,
            Object newValue) {
        if (propertyChangeListener == null) {
      return;
    }
        propertyChangeListener.propertyChange(new PropertyChangeEvent(this,
                property, oldValue, newValue));
    }

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    if (newColor != null) {
        RGB oldValue = fColorValue;
        fColorValue = newColor;
        final Object[] finalListeners = getListeners();
        if (finalListeners.length > 0) {
            PropertyChangeEvent pEvent = new PropertyChangeEvent(
                    this, PROP_COLORCHANGE, oldValue, newColor);
            for (int i = 0; i < finalListeners.length; ++i) {
                IPropertyChangeListener listener = (IPropertyChangeListener) finalListeners[i];
                listener.propertyChange(pEvent);
            }

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      Object newValue) {
    final Object[] finalListeners = getListeners();
    // Do we need to fire an event.
    if (finalListeners.length > 0
        && (oldValue == null || !oldValue.equals(newValue))) {
      final PropertyChangeEvent pe = new PropertyChangeEvent(this, name,
          oldValue, newValue);
      for (int i = 0; i < finalListeners.length; ++i) {
        final IPropertyChangeListener l = (IPropertyChangeListener) finalListeners[i];
        SafeRunnable.run(new SafeRunnable(JFaceResources
            .getString("PreferenceStore.changeError")) { //$NON-NLS-1$

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   * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(PropertyChangeEvent)
   */
  protected final void firePropertyChange(final String propertyName,
      final Object oldValue, final Object newValue) {
    if (isListenerAttached()) {
      firePropertyChange(new PropertyChangeEvent(this, propertyName,
          oldValue, newValue));
    }
  }

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   * registered, but calls firePropertyChange(PropertyChangeEvent) if there are.
   */
  private void firePropertyChange(final String propertyName,
      final Object oldValue, final Object newValue) {
    if (listenerList != null) {
      firePropertyChange(new PropertyChangeEvent(this, propertyName,
          oldValue, newValue));
    }
  }

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   */
  protected final void firePropertyChangeEvent(
      final KeySequence oldKeySequence) {
    if (listeners != null) {
      final Iterator listenerItr = listeners.iterator();
      final PropertyChangeEvent event = new PropertyChangeEvent(this,
          P_KEY_SEQUENCE, oldKeySequence, getKeySequence());
      while (listenerItr.hasNext()) {
        final IPropertyChangeListener listener = (IPropertyChangeListener) listenerItr
            .next();
        listener.propertyChange(event);

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        if ( listeners == null )
            return;


        for ( Iterator it = listeners.iterator(); it.hasNext(); )
        {
            ( ( IPropertyChangeListener ) it.next() ).propertyChange( new PropertyChangeEvent( this, property,
                oldValue, newValue ) );
        }
    }

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    // being added/removed during the notification
    final Object[] list = getListeners();
    if(list.length == 0) {
      return;
    }
    final PropertyChangeEvent event = new PropertyChangeEvent(this, name, oldValue, newValue);
    for(int i = 0; i < list.length; i++) {
      final IPropertyChangeListener listener = (IPropertyChangeListener) list[i];
      SafeRunner.run(new SafeRunnable(JFaceResources.getString("PreferenceStore.changeError")) { //$NON-NLS-1$
        public void run() {
          listener.propertyChange(event);

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