Class EventSupport

  • Direct Known Subclasses:
    XBLEventSupport

    public class EventSupport
    extends java.lang.Object
    The class allows registration and removal of EventListeners on an NodeEventTarget and dispatch of events to that NodeEventTarget.
    See Also:
    NodeEventTarget
    • Field Detail

      • capturingListeners

        protected java.util.HashMap<java.lang.String,​EventListenerList> capturingListeners
        The capturing listeners table.
      • bubblingListeners

        protected java.util.HashMap<java.lang.String,​EventListenerList> bubblingListeners
        The bubbling listeners table.
      • node

        protected AbstractNode node
        The node for which events are being handled.
    • Constructor Detail

      • EventSupport

        public EventSupport​(AbstractNode n)
        Creates a new EventSupport object.
        Parameters:
        n - the node for which events are being handled
    • Method Detail

      • addEventListener

        public void addEventListener​(java.lang.String type,
                                     org.w3c.dom.events.EventListener listener,
                                     boolean useCapture)
        This method allows the registration of event listeners on the event target. If an EventListener is added to an EventTarget which is currently processing an event the new listener will not be triggered by the current event.
        If multiple identical EventListeners are registered on the same EventTarget with the same parameters the duplicate instances are discarded. They do not cause the EventListener to be called twice and since they are discarded they do not need to be removed with the removeEventListener method.
        Parameters:
        type - The event type for which the user is registering
        listener - The listener parameter takes an interface implemented by the user which contains the methods to be called when the event occurs.
        useCapture - If true, useCapture indicates that the user wishes to initiate capture. After initiating capture, all events of the specified type will be dispatched to the registered EventListener before being dispatched to any EventTargets beneath them in the tree. Events which are bubbling upward through the tree will not trigger an EventListener designated to use capture.
      • addEventListenerNS

        public void addEventListenerNS​(java.lang.String namespaceURI,
                                       java.lang.String type,
                                       org.w3c.dom.events.EventListener listener,
                                       boolean useCapture,
                                       java.lang.Object group)
        Registers an event listener for the given namespaced event type in the specified group.
      • removeEventListener

        public void removeEventListener​(java.lang.String type,
                                        org.w3c.dom.events.EventListener listener,
                                        boolean useCapture)
        This method allows the removal of event listeners from the event target. If an EventListener is removed from an EventTarget while it is processing an event, it will complete its current actions but will not be triggered again during any later stages of event flow.
        If an EventListener is removed from an EventTarget which is currently processing an event the removed listener will still be triggered by the current event.
        Calling removeEventListener with arguments which do not identify any currently registered EventListener on the EventTarget has no effect.
        Parameters:
        type - Specifies the event type of the EventListener being removed.
        listener - The EventListener parameter indicates the EventListener to be removed.
        useCapture - Specifies whether the EventListener being removed was registered as a capturing listener or not. If a listener was registered twice, one with capture and one without, each must be removed separately. Removal of a capturing listener does not affect a non-capturing version of the same listener, and vice versa.
      • removeEventListenerNS

        public void removeEventListenerNS​(java.lang.String namespaceURI,
                                          java.lang.String type,
                                          org.w3c.dom.events.EventListener listener,
                                          boolean useCapture)
        Deregisters an event listener.
      • dispatchEvent

        public boolean dispatchEvent​(NodeEventTarget target,
                                     org.w3c.dom.events.Event evt)
                              throws org.w3c.dom.events.EventException
        This method allows the dispatch of events into the implementations event model. Events dispatched in this manner will have the same capturing and bubbling behavior as events dispatched directly by the implementation. The target of the event is the EventTarget on which dispatchEvent is called.
        Parameters:
        target - the target node
        evt - Specifies the event type, behavior, and contextual information to be used in processing the event.
        Returns:
        The return value of dispatchEvent indicates whether any of the listeners which handled the event called preventDefault. If preventDefault was called the value is false, else the value is true.
        Throws:
        org.w3c.dom.events.EventException - UNSPECIFIED_EVENT_TYPE_ERR: Raised if the Event's type was not specified by initializing the event before dispatchEvent was called. Specification of the Event's type as null or an empty string will also trigger this exception.
      • runDefaultActions

        protected void runDefaultActions​(AbstractEvent e)
        Runs all of the registered default actions for the given event object.
      • fireEventListeners

        protected void fireEventListeners​(NodeEventTarget node,
                                          AbstractEvent e,
                                          EventListenerList.Entry[] listeners,
                                          java.util.HashSet stoppedGroups,
                                          java.util.HashSet toBeStoppedGroups)
        Fires the given listeners on the given event target.
      • fireEventListeners

        protected void fireEventListeners​(NodeEventTarget node,
                                          AbstractEvent e,
                                          boolean useCapture,
                                          java.util.HashSet stoppedGroups,
                                          java.util.HashSet toBeStoppedGroups)
        Fires the registered listeners on the given event target.
      • hasEventListenerNS

        public boolean hasEventListenerNS​(java.lang.String namespaceURI,
                                          java.lang.String type)
        Returns whether this node target has an event listener for the given event namespace URI and type.
      • getEventListeners

        public EventListenerList getEventListeners​(java.lang.String type,
                                                   boolean useCapture)
        Returns a list event listeners depending on the specified event type and phase.
        Parameters:
        type - the event type
        useCapture -
      • createEventException

        protected org.w3c.dom.events.EventException createEventException​(short code,
                                                                         java.lang.String key,
                                                                         java.lang.Object[] args)
        Creates an EventException. Overrides this method if you need to create your own RangeException subclass.
        Parameters:
        code - the exception code
        key - the resource key
        args - arguments to use when formatting the message
      • getUltimateOriginalEvent

        public static org.w3c.dom.events.Event getUltimateOriginalEvent​(org.w3c.dom.events.Event evt)
        Returns the ultimate original event for the given event.