| /* |
| * Copyright (C) 2011 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.annotation.UnsupportedAppUsage; |
| import android.os.Looper; |
| import android.os.MessageQueue; |
| import android.util.Log; |
| import android.util.SparseIntArray; |
| |
| import dalvik.system.CloseGuard; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * Provides a low-level mechanism for an application to receive input events. |
| * @hide |
| */ |
| public abstract class InputEventReceiver { |
| private static final String TAG = "InputEventReceiver"; |
| |
| private final CloseGuard mCloseGuard = CloseGuard.get(); |
| |
| private long mReceiverPtr; |
| |
| // 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; |
| |
| // Map from InputEvent sequence numbers to dispatcher sequence numbers. |
| private final SparseIntArray mSeqMap = new SparseIntArray(); |
| |
| private static native long nativeInit(WeakReference<InputEventReceiver> receiver, |
| InputChannel inputChannel, MessageQueue messageQueue); |
| private static native void nativeDispose(long receiverPtr); |
| private static native void nativeFinishInputEvent(long receiverPtr, int seq, boolean handled); |
| private static native boolean nativeConsumeBatchedInputEvents(long receiverPtr, |
| long frameTimeNanos); |
| |
| /** |
| * Creates an input event receiver bound to the specified input channel. |
| * |
| * @param inputChannel The input channel. |
| * @param looper The looper to use when invoking callbacks. |
| */ |
| public InputEventReceiver(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(); |
| mReceiverPtr = nativeInit(new WeakReference<InputEventReceiver>(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 (mReceiverPtr != 0) { |
| nativeDispose(mReceiverPtr); |
| mReceiverPtr = 0; |
| } |
| |
| if (mInputChannel != null) { |
| mInputChannel.dispose(); |
| mInputChannel = null; |
| } |
| mMessageQueue = null; |
| } |
| |
| /** |
| * Called when an input event is received. |
| * The recipient should process the input event and then call {@link #finishInputEvent} |
| * to indicate whether the event was handled. No new input events will be received |
| * until {@link #finishInputEvent} is called. |
| * |
| * @param event The input event that was received. |
| */ |
| @UnsupportedAppUsage |
| public void onInputEvent(InputEvent event) { |
| finishInputEvent(event, false); |
| } |
| |
| /** |
| * Called when a batched input event is pending. |
| * |
| * The batched input event will continue to accumulate additional movement |
| * samples until the recipient calls {@link #consumeBatchedInputEvents} or |
| * an event is received that ends the batch and causes it to be consumed |
| * immediately (such as a pointer up event). |
| */ |
| public void onBatchedInputEventPending() { |
| consumeBatchedInputEvents(-1); |
| } |
| |
| /** |
| * Finishes an input event and indicates whether it was handled. |
| * Must be called on the same Looper thread to which the receiver is attached. |
| * |
| * @param event The input event that was finished. |
| * @param handled True if the event was handled. |
| */ |
| public final void finishInputEvent(InputEvent event, boolean handled) { |
| if (event == null) { |
| throw new IllegalArgumentException("event must not be null"); |
| } |
| if (mReceiverPtr == 0) { |
| Log.w(TAG, "Attempted to finish an input event but the input event " |
| + "receiver has already been disposed."); |
| } else { |
| int index = mSeqMap.indexOfKey(event.getSequenceNumber()); |
| if (index < 0) { |
| Log.w(TAG, "Attempted to finish an input event that is not in progress."); |
| } else { |
| int seq = mSeqMap.valueAt(index); |
| mSeqMap.removeAt(index); |
| nativeFinishInputEvent(mReceiverPtr, seq, handled); |
| } |
| } |
| event.recycleIfNeededAfterDispatch(); |
| } |
| |
| /** |
| * Consumes all pending batched input events. |
| * Must be called on the same Looper thread to which the receiver is attached. |
| * |
| * This method forces all batched input events to be delivered immediately. |
| * Should be called just before animating or drawing a new frame in the UI. |
| * |
| * @param frameTimeNanos The time in the {@link System#nanoTime()} time base |
| * when the current display frame started rendering, or -1 if unknown. |
| * |
| * @return Whether a batch was consumed |
| */ |
| public final boolean consumeBatchedInputEvents(long frameTimeNanos) { |
| if (mReceiverPtr == 0) { |
| Log.w(TAG, "Attempted to consume batched input events but the input event " |
| + "receiver has already been disposed."); |
| } else { |
| return nativeConsumeBatchedInputEvents(mReceiverPtr, frameTimeNanos); |
| } |
| return false; |
| } |
| |
| // Called from native code. |
| @SuppressWarnings("unused") |
| @UnsupportedAppUsage |
| private void dispatchInputEvent(int seq, InputEvent event) { |
| mSeqMap.put(event.getSequenceNumber(), seq); |
| onInputEvent(event); |
| } |
| |
| // Called from native code. |
| @SuppressWarnings("unused") |
| @UnsupportedAppUsage |
| private void dispatchBatchedInputEventPending() { |
| onBatchedInputEventPending(); |
| } |
| |
| public static interface Factory { |
| public InputEventReceiver createInputEventReceiver( |
| InputChannel inputChannel, Looper looper); |
| } |
| } |