org.apache.xerces.dom.events
Class EventImpl

java.lang.Object
  org.apache.xerces.dom.events.EventImpl

All Implemented Interfaces:

Event

Direct Known Subclasses:

MutationEventImpl, UIEventImpl

public class EventImpl
extends java.lang.Object
implements Event

EventImpl is an implementation of the basic "generic" DOM Level 2 Event object. It may be subclassed by more specialized event sets. Note that in our implementation, events are re-dispatchable (dispatch clears the stopPropagation and preventDefault flags before it starts); I believe that is the DOM's intent but I don't see an explicit statement to this effect.

Version:

$Id: EventImpl.java 533533 2007-04-29 17:30:08Z mrglavas $

Field Summary

boolean	bubbles
boolean	cancelable
EventTarget	currentTarget
short	eventPhase
boolean	initialized
boolean	preventDefault
boolean	stopPropagation
EventTarget	target
java.lang.String	type

Fields inherited from interface org.w3c.dom.events.Event

AT_TARGET, BUBBLING_PHASE, CAPTURING_PHASE

Constructor Summary

EventImpl()

Method Summary

boolean	getBubbles() Used to indicate whether or not an event is a bubbling event.
boolean	getCancelable() Used to indicate whether or not an event can have its default action prevented.
EventTarget	getCurrentTarget() Used to indicate the EventTarget whose EventListeners are currently being processed.
short	getEventPhase() Used to indicate which phase of event flow is currently being evaluated.
EventTarget	getTarget() Used to indicate the EventTarget to which the event was originally dispatched.
long	getTimeStamp() Used to specify the time (in milliseconds relative to the epoch) at which the event was created.
java.lang.String	getType() The name of the event (case-insensitive).
void	initEvent(java.lang.String eventTypeArg, boolean canBubbleArg, boolean cancelableArg) The DOM doesn't deal with constructors, so instead we have an initializer call to set most of the read-only fields.
void	preventDefault() Prevents any default processing built into the target node from occurring.
void	stopPropagation() Causes exit from in-progress event dispatch before the next currentTarget is selected.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

type

public java.lang.String type

target

public EventTarget target

currentTarget

public EventTarget currentTarget

eventPhase

public short eventPhase

initialized

public boolean initialized

bubbles

public boolean bubbles

cancelable

public boolean cancelable

stopPropagation

public boolean stopPropagation

preventDefault

public boolean preventDefault

Constructor Detail

EventImpl

public EventImpl()

Method Detail

initEvent

public void initEvent(java.lang.String eventTypeArg,
                      boolean canBubbleArg,
                      boolean cancelableArg)

The DOM doesn't deal with constructors, so instead we have an initializer call to set most of the read-only fields. The others are set, and reset, by the event subsystem during dispatch.

Note that init() -- and the subclass-specific initWhatever() calls -- may be reinvoked. At least one initialization is required; repeated initializations overwrite the event with new values of their parameters.

Specified by:

initEvent in interface Event

Parameters:

eventTypeArg - Specifies the event type. This type may be any event type currently defined in this specification or a new event type.. The string must be an XML name. Any new event type must not begin with any upper, lower, or mixed case version of the string "DOM". This prefix is reserved for future DOM event sets. It is also strongly recommended that third parties adding their own events use their own prefix to avoid confusion and lessen the probability of conflicts with other new events.

canBubbleArg - Specifies whether or not the event can bubble.

cancelableArg - Specifies whether or not the event's default action can be prevented.

getBubbles

public boolean getBubbles()

Description copied from interface: Event

Used to indicate whether or not an event is a bubbling event. If the event can bubble the value is true, else the value is false.

Specified by:

getBubbles in interface Event

Returns:

true iff this Event is of a class and type which supports bubbling. In the generic case, this is True.

getCancelable

public boolean getCancelable()

Description copied from interface: Event

Used to indicate whether or not an event can have its default action prevented. If the default action can be prevented the value is true, else the value is false.

Specified by:

getCancelable in interface Event

Returns:

true iff this Event is of a class and type which (a) has a Default Behavior in this DOM, and (b)allows cancellation (blocking) of that behavior. In the generic case, this is False.

getCurrentTarget

public EventTarget getCurrentTarget()

Description copied from interface: Event

Used to indicate the EventTarget whose EventListeners are currently being processed. This is particularly useful during capturing and bubbling.

Specified by:

getCurrentTarget in interface Event

Returns:

the Node (EventTarget) whose EventListeners are currently being processed. During capture and bubble phases, this may not be the target node.

getEventPhase

public short getEventPhase()

Description copied from interface: Event

Used to indicate which phase of event flow is currently being evaluated.

Specified by:

getEventPhase in interface Event

Returns:

the current processing phase for this event -- CAPTURING_PHASE, AT_TARGET, BUBBLING_PHASE. (There may be an internal DEFAULT_PHASE as well, but the users won't see it.)

getTarget

public EventTarget getTarget()

Description copied from interface: Event

Used to indicate the EventTarget to which the event was originally dispatched.

Specified by:

getTarget in interface Event

Returns:

the EventTarget (Node) to which the event was originally dispatched.

getType

public java.lang.String getType()

Description copied from interface: Event

The name of the event (case-insensitive). The name must be an XML name.

Specified by:

getType in interface Event

Returns:

event name as a string

getTimeStamp

public long getTimeStamp()

Description copied from interface: Event

Used to specify the time (in milliseconds relative to the epoch) at which the event was created. Due to the fact that some systems may not provide this information the value of timeStamp may be not available for all events. When not available, a value of 0 will be returned. Examples of epoch time are the time of the system start or 0:0:0 UTC 1st January 1970.

Specified by:

getTimeStamp in interface Event

stopPropagation

public void stopPropagation()

Causes exit from in-progress event dispatch before the next currentTarget is selected. Replaces the preventBubble() and preventCapture() methods which were present in early drafts; they may be reintroduced in future levels of the DOM.

Specified by:

stopPropagation in interface Event

preventDefault

public void preventDefault()

Prevents any default processing built into the target node from occurring.

Specified by:

preventDefault in interface Event