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/*
* Copyright (C) 2007 Esmertec AG.
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mms.dom.events;
import com.android.mms.LogTag;
import java.util.ArrayList;
import org.w3c.dom.events.Event;
import org.w3c.dom.events.EventException;
import org.w3c.dom.events.EventListener;
import org.w3c.dom.events.EventTarget;
import android.util.Log;
public class EventTargetImpl implements EventTarget {
private static final String TAG = LogTag.TAG;
private ArrayList<EventListenerEntry> mListenerEntries;
private EventTarget mNodeTarget;
static class EventListenerEntry
{
final String mType;
final EventListener mListener;
final boolean mUseCapture;
EventListenerEntry(String type, EventListener listener, boolean useCapture)
{
mType = type;
mListener = listener;
mUseCapture = useCapture;
}
}
public EventTargetImpl(EventTarget target) {
mNodeTarget = target;
}
public void addEventListener(String type, EventListener listener, boolean useCapture) {
if ((type == null) || type.equals("") || (listener == null)) {
return;
}
// Make sure we have only one entry
removeEventListener(type, listener, useCapture);
if (mListenerEntries == null) {
mListenerEntries = new ArrayList<EventListenerEntry>();
}
mListenerEntries.add(new EventListenerEntry(type, listener, useCapture));
}
public boolean dispatchEvent(Event evt) throws EventException {
// We need to use the internal APIs to modify and access the event status
EventImpl eventImpl = (EventImpl)evt;
if (!eventImpl.isInitialized()) {
throw new EventException(EventException.UNSPECIFIED_EVENT_TYPE_ERR,
"Event not initialized");
} else if ((eventImpl.getType() == null) || eventImpl.getType().equals("")) {
throw new EventException(EventException.UNSPECIFIED_EVENT_TYPE_ERR,
"Unspecified even type");
}
// Initialize event status
eventImpl.setTarget(mNodeTarget);
// TODO: At this point, to support event capturing and bubbling, we should
// establish the chain of EventTargets from the top of the tree to this
// event's target.
// TODO: CAPTURING_PHASE skipped
// Handle AT_TARGET
// Invoke handleEvent of non-capturing listeners on this EventTarget.
eventImpl.setEventPhase(Event.AT_TARGET);
eventImpl.setCurrentTarget(mNodeTarget);
if (!eventImpl.isPropogationStopped() && (mListenerEntries != null)) {
for (int i = 0; i < mListenerEntries.size(); i++) {
EventListenerEntry listenerEntry = mListenerEntries.get(i);
if (!listenerEntry.mUseCapture
&& listenerEntry.mType.equals(eventImpl.getType())) {
try {
listenerEntry.mListener.handleEvent(eventImpl);
}
catch (Exception e) {
// Any exceptions thrown inside an EventListener will
// not stop propagation of the event
Log.w(TAG, "Catched EventListener exception", e);
}
}
}
}
if (eventImpl.getBubbles()) {
// TODO: BUBBLING_PHASE skipped
}
return eventImpl.isPreventDefault();
}
public void removeEventListener(String type, EventListener listener,
boolean useCapture) {
if (null == mListenerEntries) {
return;
}
for (int i = 0; i < mListenerEntries.size(); i ++) {
EventListenerEntry listenerEntry = mListenerEntries.get(i);
if ((listenerEntry.mUseCapture == useCapture)
&& (listenerEntry.mListener == listener)
&& listenerEntry.mType.equals(type)) {
mListenerEntries.remove(i);
break;
}
}
}
}
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