Examples of java.beans.PropertyChangeEvent

java.beans.PropertyChangeEvent
A "PropertyChange" event gets delivered whenever a bean changes a "bound" or "constrained" property. A PropertyChangeEvent object is sent as an argument to the PropertyChangeListener and VetoableChangeListener methods.
Normally PropertyChangeEvents are accompanied by the name and the old and new value of the changed property. If the new value is a primitive type (such as int or boolean) it must be wrapped as the corresponding java.lang.* Object type (such as Integer or Boolean).
Null values may be provided for the old and the new values if their true values are not known.
An event source may send a null object as the name to indicate that an arbitrary set of if its properties have changed. In this case the old and new values should also be null.

     */
    protected void fireProviderStatusMessageChangeEvent(
        String oldStatusMessage,
        String newStatusMessage)
    {
        PropertyChangeEvent evt
            = new PropertyChangeEvent(
                    parentProvider,
                    ProviderPresenceStatusListener.STATUS_MESSAGE,
                    oldStatusMessage,
                    newStatusMessage);

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  /**
   * @param event
   */
  private void firePropertyChanged(Object source, String key, Object oldVal, Object newVal) {
    PropertyChangeEvent evt = null;
    synchronized(listeners) {
      for(int i = listeners.size() - 1; i >= 0 ; i-- ) {
        if(evt == null) {
          evt = new PropertyChangeEvent(source, key, oldVal, newVal);          
        }
        ((PropertyChangeListener)listeners.elementAt(i)).propertyChange(evt);
      }
    }    
  }

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            String propertyName = ev.getPropertyName();
            Object oldValue = ev.getOldValue();
            Object newValue = getValue(propertyName);
            if (PluginAction.Property.ENABLED.name().equals(propertyName)) {
              propertyChangeSupport.firePropertyChange(
                  new PropertyChangeEvent(ev.getSource(), "enabled", oldValue, newValue));
            } else {
              // In case a property value changes, fire the new value decorated in subclasses
              // unless new value is null (most Swing listeners don't check new value is null !)
              if (newValue != null) {
                if (PluginAction.Property.NAME.name().equals(propertyName)) {
                  propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                      Action.NAME, oldValue, newValue));
                } else if (PluginAction.Property.SHORT_DESCRIPTION.name().equals(propertyName)) {
                  propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                      Action.NAME, oldValue, newValue));
                } else if (PluginAction.Property.MNEMONIC.name().equals(propertyName)) {
                  propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                      Action.MNEMONIC_KEY, 
                      oldValue != null 
                          ? new Integer((Character)oldValue) 
                          : null, newValue));
                } else if (PluginAction.Property.SMALL_ICON.name().equals(propertyName)) {
                  propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                      Action.SMALL_ICON, 
                      oldValue != null 
                         ? IconManager.getInstance().getIcon((Content)oldValue, DEFAULT_SMALL_ICON_HEIGHT, HomePane.this) 
                         : null, newValue));
                } else {
                  propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                      propertyName, oldValue, newValue));
                }
              }
            }
          }

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            } else {
              Object newValue = getValue(propertyName);
              // In case a property value changes, fire the new value decorated in subclasses
              // unless new value is null (most Swing listeners don't check new value is null !)
              if (newValue != null) {
                propertyChangeSupport.firePropertyChange(new PropertyChangeEvent(ev.getSource(), 
                    propertyName, ev.getOldValue(), newValue));
              }
            }
          }
        });

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    if (newTracker != null) {
      if (newPropertyValue instanceof IComponent) {
        for (Map.Entry<String, Object> property : ((IComponent) newPropertyValue)
            .straightGetProperties().entrySet()) {
          if (oldPropertyValue instanceof IComponent) {
            newTracker.propertyChange(new PropertyChangeEvent(newPropertyValue,
                property.getKey(), null, property.getValue()));
          } else {
            newTracker.propertyChange(new PropertyChangeEvent(newPropertyValue,
                property.getKey(), null, property.getValue()));
          }
        }
      }
    } else if (oldTracker != null) {
      if (oldPropertyValue instanceof IComponent) {
        for (Map.Entry<String, Object> property : ((IComponent) oldPropertyValue)
            .straightGetProperties().entrySet()) {
          oldTracker.propertyChange(new PropertyChangeEvent(oldPropertyValue,
              property.getKey(), property.getValue(), null));
        }
      }
    }
  }

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    public void removePropertyChangeListener(PropertyChangeListener listener) {
        listeners.remove(listener);
    }


    private void firePropertyChangeEvent(String propertyName, Object oldValue, Object newValue) {
        PropertyChangeEvent evt = null;
        if (propertyName.equals(SELECTED_LAYOUT)) {
            evt = new PropertyChangeEvent(this, SELECTED_LAYOUT, oldValue, newValue);
        } else if (propertyName.equals(RUNNING)) {
            evt = new PropertyChangeEvent(this, RUNNING, oldValue, newValue);
        } else {
            return;
        }
        for (PropertyChangeListener l : listeners) {
            l.propertyChange(evt);

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        defaultValues();
        limits = VizController.getInstance().getLimits();
    }


    public void init() {
        final PropertyChangeEvent evt = new PropertyChangeEvent(this, "init", null, null);
        SwingUtilities.invokeLater(new Runnable() {


            public void run() {
                for (PropertyChangeListener l : listeners) {
                    l.propertyChange(evt);

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    public void removePropertyChangeListener(PropertyChangeListener listener) {
        listeners.remove(listener);
    }


    public void fireProperyChange(String propertyName, Object oldvalue, Object newValue) {
        PropertyChangeEvent evt = new PropertyChangeEvent(this, propertyName, oldvalue, newValue);
        for (PropertyChangeListener l : listeners) {
            l.propertyChange(evt);
        }
    }

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        listeners.remove(changeListener);
    }


    private void firePropertyChangeEvent(String key, Object oldValue, Object newValue) {
        //System.out.println("fire "+key+" = "+newValue);
        PropertyChangeEvent evt = new PropertyChangeEvent(this, key, oldValue, newValue);
        for (PropertyChangeListener listener : listeners) {
            listener.propertyChange(evt);
        }
    }

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    public void removePropertyChangeListener(PropertyChangeListener listener) {
        listeners.remove(listener);
    }


    private void firePropertyChangeEvent(String propertyName, Object beforeValue, Object afterValue) {
        PropertyChangeEvent event = new PropertyChangeEvent(this, propertyName, beforeValue, afterValue);
        for (PropertyChangeListener listener : listeners) {
            listener.propertyChange(event);
        }
    }

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