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/*
* Copyright (C) 2013 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.Looper;
import android.os.MessageQueue;
import android.util.Log;
import dalvik.system.CloseGuard;
import java.lang.ref.WeakReference;
/**
* Provides a low-level mechanism for an application to send input events.
* @hide
*/
public abstract class InputEventSender {
private static final String TAG = "InputEventSender";
private final CloseGuard mCloseGuard = CloseGuard.get();
private long mSenderPtr;
// We keep references to the input channel and message queue objects here so that
// they are not GC'd while the native peer of the receiver is using them.
private InputChannel mInputChannel;
private MessageQueue mMessageQueue;
private static native long nativeInit(WeakReference<InputEventSender> sender,
InputChannel inputChannel, MessageQueue messageQueue);
private static native void nativeDispose(long senderPtr);
private static native boolean nativeSendKeyEvent(long senderPtr, int seq, KeyEvent event);
private static native boolean nativeSendMotionEvent(long senderPtr, int seq, MotionEvent event);
/**
* Creates an input event sender bound to the specified input channel.
*
* @param inputChannel The input channel.
* @param looper The looper to use when invoking callbacks.
*/
public InputEventSender(InputChannel inputChannel, Looper looper) {
if (inputChannel == null) {
throw new IllegalArgumentException("inputChannel must not be null");
}
if (looper == null) {
throw new IllegalArgumentException("looper must not be null");
}
mInputChannel = inputChannel;
mMessageQueue = looper.getQueue();
mSenderPtr = nativeInit(new WeakReference<InputEventSender>(this),
inputChannel, mMessageQueue);
mCloseGuard.open("dispose");
}
@Override
protected void finalize() throws Throwable {
try {
dispose(true);
} finally {
super.finalize();
}
}
/**
* Disposes the receiver.
*/
public void dispose() {
dispose(false);
}
private void dispose(boolean finalized) {
if (mCloseGuard != null) {
if (finalized) {
mCloseGuard.warnIfOpen();
}
mCloseGuard.close();
}
if (mSenderPtr != 0) {
nativeDispose(mSenderPtr);
mSenderPtr = 0;
}
mInputChannel = null;
mMessageQueue = null;
}
/**
* Called when an input event is finished.
*
* @param seq The input event sequence number.
* @param handled True if the input event was handled.
*/
public void onInputEventFinished(int seq, boolean handled) {
}
/**
* Sends an input event.
* Must be called on the same Looper thread to which the sender is attached.
*
* @param seq The input event sequence number.
* @param event The input event to send.
* @return True if the entire event was sent successfully. May return false
* if the input channel buffer filled before all samples were dispatched.
*/
public final boolean sendInputEvent(int seq, InputEvent event) {
if (event == null) {
throw new IllegalArgumentException("event must not be null");
}
if (mSenderPtr == 0) {
Log.w(TAG, "Attempted to send an input event but the input event "
+ "sender has already been disposed.");
return false;
}
if (event instanceof KeyEvent) {
return nativeSendKeyEvent(mSenderPtr, seq, (KeyEvent)event);
} else {
return nativeSendMotionEvent(mSenderPtr, seq, (MotionEvent)event);
}
}
// Called from native code.
@SuppressWarnings("unused")
private void dispatchInputEventFinished(int seq, boolean handled) {
onInputEventFinished(seq, handled);
}
}
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