| /* |
| * 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"; |
| |
| public static interface Callback { |
| void onInputQueueCreated(InputQueue queue); |
| void onInputQueueDestroyed(InputQueue queue); |
| } |
| |
| final InputChannel mChannel; |
| |
| // Describes the interpretation of an event. |
| // XXX This concept is tentative. See comments in android/input.h. |
| /** @hide */ |
| public static final int INPUT_EVENT_NATURE_KEY = 1; |
| /** @hide */ |
| public static final int INPUT_EVENT_NATURE_TOUCH = 2; |
| /** @hide */ |
| public static final int INPUT_EVENT_NATURE_TRACKBALL = 3; |
| |
| private static 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); |
| |
| /** @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) { |
| 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) { |
| Slog.d(TAG, "Unregistering input channel '" + inputChannel + "'"); |
| nativeUnregisterInputChannel(inputChannel); |
| } |
| } |
| |
| @SuppressWarnings("unused") |
| private static void dispatchKeyEvent(InputHandler inputHandler, |
| KeyEvent event, int nature, long finishedToken) { |
| Runnable finishedCallback = new FinishedCallback(finishedToken); |
| |
| if (nature == INPUT_EVENT_NATURE_KEY) { |
| inputHandler.handleKey(event, finishedCallback); |
| } else { |
| Slog.d(TAG, "Unsupported nature for key event: " + nature); |
| } |
| } |
| |
| @SuppressWarnings("unused") |
| private static void dispatchMotionEvent(InputHandler inputHandler, |
| MotionEvent event, int nature, long finishedToken) { |
| Runnable finishedCallback = new FinishedCallback(finishedToken); |
| |
| if (nature == INPUT_EVENT_NATURE_TOUCH) { |
| inputHandler.handleTouch(event, finishedCallback); |
| } else if (nature == INPUT_EVENT_NATURE_TRACKBALL) { |
| inputHandler.handleTrackball(event, finishedCallback); |
| } else { |
| Slog.d(TAG, "Unsupported nature for motion event: " + nature); |
| } |
| } |
| |
| // TODO consider recycling finished callbacks when done |
| private static class FinishedCallback implements Runnable { |
| private long mFinishedToken; |
| |
| public FinishedCallback(long finishedToken) { |
| mFinishedToken = finishedToken; |
| } |
| |
| public void run() { |
| synchronized (sLock) { |
| nativeFinished(mFinishedToken); |
| } |
| } |
| } |
| } |