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.

  /**
   * Forteller at objekt har bufferverdier
   */
  void fireBufferChange() {
    for (PropertyChangeListener listener : bufferingListeners) {
      listener.propertyChange(new PropertyChangeEvent(presentationModel
          .getBean(),
          String.valueOf(presentationModel.isBuffering()),
          presentationModel.getBean(), String
              .valueOf(presentationModel.isBuffering())));
    }

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            this.listener = listener;
        }


        public Object put(Object key, Object value) {
            Object oldValue = super.put(key, value);
            PropertyChangeEvent event = new PropertyChangeEvent(source, propertyName, null, value);
            listener.propertyChange(event);
            return oldValue;
        }

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            return oldValue;
        }


        public Object remove(Object key) {
            Object value = super.remove(key);
            PropertyChangeEvent event = new PropertyChangeEvent(source, propertyName, value, null);
            listener.propertyChange(event);
            return value;
        }

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    } else {
      visibleColumns.remove(columnName);
    }


    propertySupport.firePropertyChange(
      new PropertyChangeEvent(
        this, "visibleColumns", new Boolean(oldValue), new Boolean(newValue)));
  }

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        EventConsumer c = new EventConsumer();
        EventLinker l = new EventLinkerImpl(null);


        l.addEventListener(p, null, c, null);


        PropertyChangeEvent e = new PropertyChangeEvent(this, "whatever", "foo", "bar");


        p.fire(e);


        assertSame(e, c.getLastEvent());

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        EventConsumer c = new EventConsumer();
        EventLinker l = new EventLinkerImpl(null);


        l.addEventListener(p, "propertyChange", c, null);


        PropertyChangeEvent e = new PropertyChangeEvent(this, "whatever", "foo", "bar");


        p.fire(e);


        assertSame(e, c.getLastEvent());
    }

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            prev.removeListener(this);
            prev.stop();
        }


        // notify listeners
        PropertyChangeEvent evt = new PropertyChangeEvent(this, PROPERTY_CONFIG, prev, config);
        for (PropertyChangeListener listener : propertyChangeListeners) {
            listener.propertyChange(evt);
        }
        return prev;
    }

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        EventConsumer c = new EventConsumer();
        EventLinker l = new EventLinkerImpl(null);


        l.addEventListener(p, null, c, null);


        PropertyChangeEvent e = new PropertyChangeEvent(this, "whatever", "foo", "bar");


        p.fire(e);


        assertSame(e, c.getLastEvent());

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        EventConsumer c = new EventConsumer();
        EventLinker l = new EventLinkerImpl(null);


        l.addEventListener(p, "propertyChange", c, null);


        PropertyChangeEvent e = new PropertyChangeEvent(this, "whatever", "foo", "bar");


        p.fire(e);


        assertSame(e, c.getLastEvent());
    }

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        // which should result in one PCE events
        assertEquals(1, pces.size());


        // test for the acutal update of the value
        PropertyChangeEvent propertyChangeEvent = pces.get(0);


        assertEquals("description", propertyChangeEvent.getPropertyName());
        assertEquals("log", propertyChangeEvent.getOldValue());
        assertEquals("updated log", propertyChangeEvent.getNewValue());


    }

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