/**
* Removes all registered listeners matching the given parameters. Since this method receives the
* event type and the listener object as parameters, it will unregister all <code>object</code>'s
* methods that are registered to listen to events of type <code>eventType</code> generated by
* this component.
*
* <p>This method additionally informs the event-api to stop routing events with the given
* eventIdentifier to the components handleEvent function call.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* @param eventIdentifier the identifier of the event to stop listening for
* @param eventType the exact event type the <code>object</code> listens to.
* @param target the target object that has registered to listen to events of type <code>eventType
* </code> with one or more methods.
* @since 6.2
*/
protected void removeListener(String eventIdentifier, Class<?> eventType, Object target) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target);
if (!eventRouter.hasListeners(eventType)) {
ComponentStateUtil.removeRegisteredEventListener(getState(), eventIdentifier);
}
}
}
/**
* Registers a new listener with the specified activation method to listen events generated by
* this component. If the activation method does not have any arguments the event object will not
* be passed to it when it's called.
*
* <p>This method additionally informs the event-api to route events with the given
* eventIdentifier to the components handleEvent function call.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* @param eventIdentifier the identifier of the event to listen for
* @param eventType the type of the listened event. Events of this type or its subclasses activate
* the listener.
* @param target the object instance who owns the activation method.
* @param method the activation method.
* @since 6.2
*/
protected void addListener(
String eventIdentifier, Class<?> eventType, Object target, Method method) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
boolean needRepaint = !eventRouter.hasListeners(eventType);
eventRouter.addListener(eventType, target, method);
if (needRepaint) {
ComponentStateUtil.addRegisteredEventListener(getState(), eventIdentifier);
}
}
/**
* Returns all listeners that are registered for the given event type or one of its subclasses.
*
* @param eventType The type of event to return listeners for.
* @return A collection with all registered listeners. Empty if no listeners are found.
*/
public Collection<?> getListeners(Class<?> eventType) {
if (eventRouter == null) {
return Collections.EMPTY_LIST;
}
return eventRouter.getListeners(eventType);
}
/**
* Removes one registered listener method. The given method owned by the given object will no
* longer be called when the specified events are generated by this component.
*
* <p>This version of <code>removeListener</code> gets the name of the activation method as a
* parameter. The actual method is reflected from <code>target</code>, and unless exactly one
* match is found, <code>java.lang.IllegalArgumentException</code> is thrown.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* @param eventType the exact event type the <code>object</code> listens to.
* @param target the target object that has registered to listen to events of type <code>eventType
* </code> with one or more methods.
* @param methodName the name of the method owned by <code>target</code> that's registered to
* listen to events of type <code>eventType</code>.
* @deprecated As of 7.0. This method should be avoided. Use {@link #removeListener(Class, Object,
* Method)} instead.
*/
@Deprecated
@Override
public void removeListener(Class<?> eventType, Object target, String methodName) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target, methodName);
}
}
/**
* Registers a new listener with the specified activation method to listen events generated by
* this component. If the activation method does not have any arguments the event object will not
* be passed to it when it's called.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* @param eventType the type of the listened event. Events of this type or its subclasses activate
* the listener.
* @param target the object instance who owns the activation method.
* @param method the activation method.
*/
@Override
public void addListener(Class<?> eventType, Object target, Method method) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
eventRouter.addListener(eventType, target, method);
}
/**
* Registers a new listener with the specified activation method to listen events generated by
* this component. If the activation method does not have any arguments the event object will not
* be passed to it when it's called.
*
* @param eventType the type of the listened event. Events of this type or its subclasses activate
* the listener.
* @param listener the object instance who owns the activation method.
* @param method the activation method.
* @return a registration for the listener
*/
protected Registration addListener(
Class<?> eventType, DataProviderListener listener, Method method) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
return eventRouter.addListener(eventType, listener, method);
}
/**
* Convenience method for registering a new listener with the specified activation method to
* listen events generated by this component. If the activation method does not have any arguments
* the event object will not be passed to it when it's called.
*
* <p>This version of <code>addListener</code> gets the name of the activation method as a
* parameter. The actual method is reflected from <code>object</code>, and unless exactly one
* match is found, <code>java.lang.IllegalArgumentException</code> is thrown.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* <p>Note: Using this method is discouraged because it cannot be checked during compilation. Use
* {@link #addListener(Class, Object, Method)} or {@link
* #addListener(com.vaadin.ui.Component.Listener)} instead.
*
* @param eventType the type of the listened event. Events of this type or its subclasses activate
* the listener.
* @param target the object instance who owns the activation method.
* @param methodName the name of the activation method.
* @deprecated As of 7.0. This method should be avoided. Use {@link #addListener(Class, Object,
* Method)} or {@link #addListener(String, Class, Object, Method)} instead.
*/
@Override
@Deprecated
public void addListener(Class<?> eventType, Object target, String methodName) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
eventRouter.addListener(eventType, target, methodName);
}
/**
* Sends the event to all listeners.
*
* @param event the Event to be sent to all listeners.
*/
protected void fireEvent(EventObject event) {
if (eventRouter != null) {
eventRouter.fireEvent(event);
}
}
/**
* Removes one registered listener method. The given method owned by the given object will no
* longer be called when the specified events are generated by this component.
*
* <p>For more information on the inheritable event mechanism see the {@link com.vaadin.event
* com.vaadin.event package documentation}.
*
* @param eventType the exact event type the <code>object</code> listens to.
* @param target target object that has registered to listen to events of type <code>eventType
* </code> with one or more methods.
* @param method the method owned by <code>target</code> that's registered to listen to events of
* type <code>eventType</code>.
*/
@Override
public void removeListener(Class<?> eventType, Object target, Method method) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target, method);
}
}
/**
* Checks if the given {@link Event} type is listened for this component.
*
* @param eventType the event type to be checked
* @return true if a listener is registered for the given event type
*/
protected boolean hasListeners(Class<?> eventType) {
return eventRouter != null && eventRouter.hasListeners(eventType);
}
/**
* Removes all registered listeners matching the given parameters. Since this method receives the
* event type and the listener object as parameters, it will unregister all <code>object</code>'s
* methods that are registered to listen to events of type <code>eventType</code> generated by
* this component.
*
* @param eventType the exact event type the <code>object</code> listens to.
* @param listener the target object that has registered to listen to events of type <code>
* eventType</code> with one or more methods.
*/
protected void removeListener(Class<?> eventType, DataProviderListener listener) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, listener);
}
}
