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/*
* Copyright (C) 2010 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 android.view;
import dalvik.system.CloseGuard;
import android.os.Handler;
import android.os.Looper;
import android.os.MessageQueue;
import android.util.Pools.Pool;
import android.util.Pools.SimplePool;
import android.util.SparseArray;
import java.lang.ref.WeakReference;
/**
* An input queue provides a mechanism for an application to receive incoming
* input events. Currently only usable from native code.
*/
public final class InputQueue {
private final SparseArray<ActiveInputEvent> mActiveEventArray =
new SparseArray<ActiveInputEvent>(20);
private final Pool<ActiveInputEvent> mActiveInputEventPool =
new SimplePool<ActiveInputEvent>(20);
private final CloseGuard mCloseGuard = CloseGuard.get();
private int mPtr;
private static native int nativeInit(WeakReference<InputQueue> weakQueue,
MessageQueue messageQueue);
private static native int nativeSendKeyEvent(int ptr, KeyEvent e, boolean preDispatch);
private static native int nativeSendMotionEvent(int ptr, MotionEvent e);
private static native void nativeDispose(int ptr);
/** @hide */
public InputQueue() {
mPtr = nativeInit(new WeakReference<InputQueue>(this), Looper.myQueue());
mCloseGuard.open("dispose");
}
@Override
protected void finalize() throws Throwable {
try {
dispose(true);
} finally {
super.finalize();
}
}
/** @hide */
public void dispose() {
dispose(false);
}
/** @hide */
public void dispose(boolean finalized) {
if (mCloseGuard != null) {
if (finalized) {
mCloseGuard.warnIfOpen();
}
mCloseGuard.close();
}
if (mPtr != 0) {
nativeDispose(mPtr);
mPtr = 0;
}
}
/** @hide */
public int getNativePtr() {
return mPtr;
}
/** @hide */
public void sendInputEvent(InputEvent e, Object token, boolean predispatch,
FinishedInputEventCallback callback) {
ActiveInputEvent event = obtainActiveInputEvent(token, callback);
int id;
if (e instanceof KeyEvent) {
id = nativeSendKeyEvent(mPtr, (KeyEvent) e, predispatch);
} else {
id = nativeSendMotionEvent(mPtr, (MotionEvent) e);
}
mActiveEventArray.put(id, event);
}
private void finishInputEvent(int id, boolean handled) {
int index = mActiveEventArray.indexOfKey(id);
if (index >= 0) {
ActiveInputEvent e = mActiveEventArray.valueAt(index);
mActiveEventArray.removeAt(index);
e.mCallback.onFinishedInputEvent(e.mToken, handled);
recycleActiveInputEvent(e);
}
}
private ActiveInputEvent obtainActiveInputEvent(Object token,
FinishedInputEventCallback callback) {
ActiveInputEvent e = mActiveInputEventPool.acquire();
if (e == null) {
e = new ActiveInputEvent();
}
e.mToken = token;
e.mCallback = callback;
return e;
}
private void recycleActiveInputEvent(ActiveInputEvent e) {
e.recycle();
mActiveInputEventPool.release(e);
}
private final class ActiveInputEvent {
public Object mToken;
public FinishedInputEventCallback mCallback;
public void recycle() {
mToken = null;
mCallback = null;
}
}
/**
* Interface to receive notification of when an InputQueue is associated
* and dissociated with a thread.
*/
public static interface Callback {
/**
* Called when the given InputQueue is now associated with the
* thread making this call, so it can start receiving events from it.
*/
void onInputQueueCreated(InputQueue queue);
/**
* Called when the given InputQueue is no longer associated with
* the thread and thus not dispatching events.
*/
void onInputQueueDestroyed(InputQueue queue);
}
/** @hide */
public static interface FinishedInputEventCallback {
void onFinishedInputEvent(Object token, boolean handled);
}
}
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