jdk.awt.AWTEventMulticaster

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Clojure only.

AWTEventMulticaster implements efficient and thread-safe multi-cast event dispatching for the AWT events defined in the java.awt.event package.

The following example illustrates how to use this class:

public myComponent extends Component { ActionListener actionListener = null;

public synchronized void addActionListener(ActionListener l) {
    actionListener = AWTEventMulticaster.add(actionListener, l);
}
public synchronized void removeActionListener(ActionListener l) {
    actionListener = AWTEventMulticaster.remove(actionListener, l);
}
public void processEvent(AWTEvent e) {
    // when event occurs which causes "action" semantic
    ActionListener listener = actionListener;
    if (listener != null) {
        listener.actionPerformed(new ActionEvent());
    }
}

} The important point to note is the first argument to the add and remove methods is the field maintaining the listeners. In addition you must assign the result of the add and remove methods to the field maintaining the listeners.

AWTEventMulticaster is implemented as a pair of EventListeners that are set at construction time. AWTEventMulticaster is immutable. The add and remove methods do not alter AWTEventMulticaster in anyway. If necessary, a new AWTEventMulticaster is created. In this way it is safe to add and remove listeners during the process of an event dispatching. However, event listeners added during the process of an event dispatch operation are not notified of the event currently being dispatched.

All of the add methods allow null arguments. If the first argument is null, the second argument is returned. If the first argument is not null and the second argument is null, the first argument is returned. If both arguments are non-null, a new AWTEventMulticaster is created using the two arguments and returned.

For the remove methods that take two arguments, the following is returned:

null, if the first argument is null, or the arguments are equal, by way of ==. the first argument, if the first argument is not an instance of AWTEventMulticaster. result of invoking remove(EventListener) on the first argument, supplying the second argument to the remove(EventListener) method.

Swing makes use of EventListenerList for similar logic. Refer to it for details.

AWTEventMulticaster implements efficient and thread-safe multi-cast
event dispatching for the AWT events defined in the java.awt.event
package.

The following example illustrates how to use this class:



public myComponent extends Component {
    ActionListener actionListener = null;

    public synchronized void addActionListener(ActionListener l) {
        actionListener = AWTEventMulticaster.add(actionListener, l);
    }
    public synchronized void removeActionListener(ActionListener l) {
        actionListener = AWTEventMulticaster.remove(actionListener, l);
    }
    public void processEvent(AWTEvent e) {
        // when event occurs which causes "action" semantic
        ActionListener listener = actionListener;
        if (listener != null) {
            listener.actionPerformed(new ActionEvent());
        }
    }
}
The important point to note is the first argument to the add and remove methods is the field maintaining the
listeners. In addition you must assign the result of the add
and remove methods to the field maintaining the listeners.

AWTEventMulticaster is implemented as a pair of EventListeners that are set at construction time. AWTEventMulticaster is immutable. The add and remove methods do not alter AWTEventMulticaster in
anyway. If necessary, a new AWTEventMulticaster is
created. In this way it is safe to add and remove listeners during
the process of an event dispatching.  However, event listeners
added during the process of an event dispatch operation are not
notified of the event currently being dispatched.

All of the add methods allow null arguments. If the
first argument is null, the second argument is returned. If
the first argument is not null and the second argument is
null, the first argument is returned. If both arguments are
non-null, a new AWTEventMulticaster is created using
the two arguments and returned.

For the remove methods that take two arguments, the following is
returned:

  null, if the first argument is null, or
      the arguments are equal, by way of ==.
  the first argument, if the first argument is not an instance of
      AWTEventMulticaster.
  result of invoking remove(EventListener) on the
      first argument, supplying the second argument to the
      remove(EventListener) method.

Swing makes use of
EventListenerList for
similar logic. Refer to it for details.

jdk.awt.AWTEventMulticaster

*addclj

*get-listenersclj

*removeclj

action-performedclj

adjustment-value-changedclj

ancestor-movedclj

ancestor-resizedclj

caret-position-changedclj

component-addedclj

component-hiddenclj

component-movedclj

component-removedclj

component-resizedclj

component-shownclj

focus-gainedclj

focus-lostclj

hierarchy-changedclj

input-method-text-changedclj

item-state-changedclj

key-pressedclj

key-releasedclj

key-typedclj

mouse-clickedclj

mouse-draggedclj

mouse-enteredclj

mouse-exitedclj

mouse-movedclj

mouse-pressedclj

mouse-releasedclj

mouse-wheel-movedclj

text-value-changedclj

window-activatedclj

window-closedclj

window-closingclj

window-deactivatedclj

window-deiconifiedclj

window-gained-focusclj

window-iconifiedclj

window-lost-focusclj

window-openedclj

window-state-changedclj

*add^clj

*get-listeners^clj

*remove^clj

action-performed^clj

adjustment-value-changed^clj

ancestor-moved^clj

ancestor-resized^clj

caret-position-changed^clj

component-added^clj

component-hidden^clj

component-moved^clj

component-removed^clj

component-resized^clj

component-shown^clj

focus-gained^clj

focus-lost^clj

hierarchy-changed^clj

input-method-text-changed^clj

item-state-changed^clj

key-pressed^clj

key-released^clj

key-typed^clj

mouse-clicked^clj

mouse-dragged^clj

mouse-entered^clj

mouse-exited^clj

mouse-moved^clj

mouse-pressed^clj

mouse-released^clj

mouse-wheel-moved^clj

text-value-changed^clj

window-activated^clj

window-closed^clj

window-closing^clj

window-deactivated^clj

window-deiconified^clj

window-gained-focus^clj

window-iconified^clj

window-lost-focus^clj

window-opened^clj

window-state-changed^clj