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javax.swing.event
Class SwingPropertyChangeSupport
java.lang.Object
java.beans.PropertyChangeSupport
javax.swing.event.SwingPropertyChangeSupport
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All Implemented Interfaces:
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Serializable
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public final class
SwingPropertyChangeSupport
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extends
PropertyChangeSupport
This subclass of java.beans.PropertyChangeSupport is identical in functionality -- it sacrifices thread-safety (not a Swing concern) for reduce memory consumption, which helps performance (both big Swing concerns). Most of the overridden methods are only necessary because all of PropertyChangeSupport's instance data is private, without accessor methods.
Methods inherited from class java.beans.
PropertyChangeSupport
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addPropertyChangeListener
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addPropertyChangeListener
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fireIndexedPropertyChange
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fireIndexedPropertyChange
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fireIndexedPropertyChange
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firePropertyChange
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firePropertyChange
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firePropertyChange
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firePropertyChange
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getPropertyChangeListeners
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getPropertyChangeListeners
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hasListeners
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removePropertyChangeListener
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removePropertyChangeListener
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firePropertyChange
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firePropertyChange
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Methods inherited from class java.lang.
Object
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clone
,
equals
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finalize
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getClass
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hashCode
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notify
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notifyAll
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toString
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wait
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wait
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wait
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SwingPropertyChangeSupport
public SwingPropertyChangeSupport(Object sourceBean)
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Constructs a SwingPropertyChangeSupport object.
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Parameters:
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sourceBean - The bean to be given as the source for any events.
Method Detail
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addPropertyChangeListener
public void addPropertyChangeListener ( PropertyChangeListener listener)
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Add a PropertyChangeListener to the listener list. The listener is registered for all properties.
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Overrides:
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addPropertyChangeListener
in class
PropertyChangeSupport
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Parameters:
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listener - The PropertyChangeListener to be added
removePropertyChangeListener
public void removePropertyChangeListener ( PropertyChangeListener listener)
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Remove a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.
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Overrides:
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removePropertyChangeListener
in class
PropertyChangeSupport
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Parameters:
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listener - The PropertyChangeListener to be removed
getPropertyChangeListeners
public PropertyChangeListener[] getPropertyChangeListeners ()
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Returns an array of all the listeners that were added to the SwingPropertyChangeSupport object with addPropertyChangeListener().
If some listeners have been added with a named property, then the returned array will be a mixture of PropertyChangeListeners and PropertyChangeListenerProxys. If the calling method is interested in distinguishing the listeners then it must test each element to see if it's a PropertyChangeListenerProxy perform the cast and examine the parameter.
PropertyChangeListener[] listeners = support.getPropertyChangeListeners();
for (int i = 0; i < listeners.length; i++) {
if (listeners[i] instanceof PropertyChangeListenerProxy) {
PropertyChangeListenerProxy proxy =
(PropertyChangeListenerProxy)listeners[i];
if (proxy.getPropertyName().equals("foo")) {
// proxy is a PropertyChangeListener which was associated
// with the property named "foo"
}
}
}
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Overrides:
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getPropertyChangeListeners
in class
PropertyChangeSupport
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Returns:
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all of the PropertyChangeListeners added or an empty array if no listeners have been added
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Since:
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1.4
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See Also:
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PropertyChangeListenerProxy
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PropertyChangeSupport.getPropertyChangeListeners()
addPropertyChangeListener
public void addPropertyChangeListener ( String propertyName,
PropertyChangeListener listener)
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Add a PropertyChangeListener for a specific property. The listener will be invoked only when a call on firePropertyChange names that specific property.
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Overrides:
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addPropertyChangeListener
in class
PropertyChangeSupport
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Parameters:
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propertyName - The name of the property to listen on.
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listener - The PropertyChangeListener to be added
removePropertyChangeListener
public void removePropertyChangeListener ( String propertyName,
PropertyChangeListener listener)
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Remove a PropertyChangeListener for a specific property.
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Overrides:
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removePropertyChangeListener
in class
PropertyChangeSupport
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Parameters:
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propertyName - The name of the property that was listened on.
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listener - The PropertyChangeListener to be removed
getPropertyChangeListeners
public PropertyChangeListener[] getPropertyChangeListeners ( String propertyName)
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Returns an array of all the listeners which have been associated with the named property.
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Overrides:
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getPropertyChangeListeners
in class
PropertyChangeSupport
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Returns:
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all of the PropertyChangeListeners associated with the named property or an empty array if no listeners have been added
firePropertyChange
public void firePropertyChange ( String propertyName,
Object oldValue,
Object newValue)
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Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.
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Overrides:
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firePropertyChange
in class
PropertyChangeSupport
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Parameters:
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propertyName - The programmatic name of the property that was changed.
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oldValue - The old value of the property.
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newValue - The new value of the property.
firePropertyChange
public void firePropertyChange ( PropertyChangeEvent evt)
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Fire an existing PropertyChangeEvent to any registered listeners. No event is fired if the given event's old and new values are equal and non-null.
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Overrides:
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firePropertyChange
in class
PropertyChangeSupport
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Parameters:
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evt - The PropertyChangeEvent object.
hasListeners
public boolean hasListeners ( String propertyName)
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Check if there are any listeners for a specific property.
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Overrides:
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hasListeners
in class
PropertyChangeSupport
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Parameters:
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propertyName - the property name.
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Returns:
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true if there are ore or more listeners for the given property