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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 android.os.MessageQueue;
import android.util.Slog;
/**
* 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 static final String TAG = "InputQueue";
private static final boolean DEBUG = false;
/**
* 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);
}
final InputChannel mChannel;
private static final Object sLock = new Object();
private static native void nativeRegisterInputChannel(InputChannel inputChannel,
InputHandler inputHandler, MessageQueue messageQueue);
private static native void nativeUnregisterInputChannel(InputChannel inputChannel);
private static native void nativeFinished(long finishedToken, boolean handled);
/** @hide */
public InputQueue(InputChannel channel) {
mChannel = channel;
}
/** @hide */
public InputChannel getInputChannel() {
return mChannel;
}
/**
* Registers an input channel and handler.
* @param inputChannel The input channel to register.
* @param inputHandler The input handler to input events send to the target.
* @param messageQueue The message queue on whose thread the handler should be invoked.
* @hide
*/
public static void registerInputChannel(InputChannel inputChannel, InputHandler inputHandler,
MessageQueue messageQueue) {
if (inputChannel == null) {
throw new IllegalArgumentException("inputChannel must not be null");
}
if (inputHandler == null) {
throw new IllegalArgumentException("inputHandler must not be null");
}
if (messageQueue == null) {
throw new IllegalArgumentException("messageQueue must not be null");
}
synchronized (sLock) {
if (DEBUG) {
Slog.d(TAG, "Registering input channel '" + inputChannel + "'");
}
nativeRegisterInputChannel(inputChannel, inputHandler, messageQueue);
}
}
/**
* Unregisters an input channel.
* Does nothing if the channel is not currently registered.
* @param inputChannel The input channel to unregister.
* @hide
*/
public static void unregisterInputChannel(InputChannel inputChannel) {
if (inputChannel == null) {
throw new IllegalArgumentException("inputChannel must not be null");
}
synchronized (sLock) {
if (DEBUG) {
Slog.d(TAG, "Unregistering input channel '" + inputChannel + "'");
}
nativeUnregisterInputChannel(inputChannel);
}
}
@SuppressWarnings("unused")
private static void dispatchKeyEvent(InputHandler inputHandler,
KeyEvent event, long finishedToken) {
FinishedCallback finishedCallback = FinishedCallback.obtain(finishedToken);
inputHandler.handleKey(event, finishedCallback);
}
@SuppressWarnings("unused")
private static void dispatchMotionEvent(InputHandler inputHandler,
MotionEvent event, long finishedToken) {
FinishedCallback finishedCallback = FinishedCallback.obtain(finishedToken);
inputHandler.handleMotion(event, finishedCallback);
}
/**
* A callback that must be invoked to when finished processing an event.
* @hide
*/
public static final class FinishedCallback {
private static final boolean DEBUG_RECYCLING = false;
private static final int RECYCLE_MAX_COUNT = 4;
private static FinishedCallback sRecycleHead;
private static int sRecycleCount;
private FinishedCallback mRecycleNext;
private long mFinishedToken;
private FinishedCallback() {
}
public static FinishedCallback obtain(long finishedToken) {
synchronized (sLock) {
FinishedCallback callback = sRecycleHead;
if (callback != null) {
sRecycleHead = callback.mRecycleNext;
sRecycleCount -= 1;
callback.mRecycleNext = null;
} else {
callback = new FinishedCallback();
}
callback.mFinishedToken = finishedToken;
return callback;
}
}
public void finished(boolean handled) {
synchronized (sLock) {
if (mFinishedToken == -1) {
throw new IllegalStateException("Event finished callback already invoked.");
}
nativeFinished(mFinishedToken, handled);
mFinishedToken = -1;
if (sRecycleCount < RECYCLE_MAX_COUNT) {
mRecycleNext = sRecycleHead;
sRecycleHead = this;
sRecycleCount += 1;
if (DEBUG_RECYCLING) {
Slog.d(TAG, "Recycled finished callbacks: " + sRecycleCount);
}
}
}
}
}
}
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