| /* |
| * 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.Parcel; |
| import android.os.Parcelable; |
| import android.util.Slog; |
| |
| /** |
| * An input channel specifies the file descriptors used to send input events to |
| * a window in another process. It is Parcelable so that it can be sent |
| * to the process that is to receive events. Only one thread should be reading |
| * from an InputChannel at a time. |
| * @hide |
| */ |
| public final class InputChannel implements Parcelable { |
| private static final String TAG = "InputChannel"; |
| |
| private static final boolean DEBUG = false; |
| |
| public static final Parcelable.Creator<InputChannel> CREATOR |
| = new Parcelable.Creator<InputChannel>() { |
| public InputChannel createFromParcel(Parcel source) { |
| InputChannel result = new InputChannel(); |
| result.readFromParcel(source); |
| return result; |
| } |
| |
| public InputChannel[] newArray(int size) { |
| return new InputChannel[size]; |
| } |
| }; |
| |
| @SuppressWarnings("unused") |
| private long mPtr; // used by native code |
| |
| private static native InputChannel[] nativeOpenInputChannelPair(String name); |
| |
| private native void nativeDispose(boolean finalized); |
| private native void nativeTransferTo(InputChannel other); |
| private native void nativeReadFromParcel(Parcel parcel); |
| private native void nativeWriteToParcel(Parcel parcel); |
| private native void nativeDup(InputChannel target); |
| |
| private native String nativeGetName(); |
| |
| /** |
| * Creates an uninitialized input channel. |
| * It can be initialized by reading from a Parcel or by transferring the state of |
| * another input channel into this one. |
| */ |
| public InputChannel() { |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| nativeDispose(true); |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| /** |
| * Creates a new input channel pair. One channel should be provided to the input |
| * dispatcher and the other to the application's input queue. |
| * @param name The descriptive (non-unique) name of the channel pair. |
| * @return A pair of input channels. The first channel is designated as the |
| * server channel and should be used to publish input events. The second channel |
| * is designated as the client channel and should be used to consume input events. |
| */ |
| public static InputChannel[] openInputChannelPair(String name) { |
| if (name == null) { |
| throw new IllegalArgumentException("name must not be null"); |
| } |
| |
| if (DEBUG) { |
| Slog.d(TAG, "Opening input channel pair '" + name + "'"); |
| } |
| return nativeOpenInputChannelPair(name); |
| } |
| |
| /** |
| * Gets the name of the input channel. |
| * @return The input channel name. |
| */ |
| public String getName() { |
| String name = nativeGetName(); |
| return name != null ? name : "uninitialized"; |
| } |
| |
| /** |
| * Disposes the input channel. |
| * Explicitly releases the reference this object is holding on the input channel. |
| * When all references are released, the input channel will be closed. |
| */ |
| public void dispose() { |
| nativeDispose(false); |
| } |
| |
| /** |
| * Transfers ownership of the internal state of the input channel to another |
| * instance and invalidates this instance. This is used to pass an input channel |
| * as an out parameter in a binder call. |
| * @param other The other input channel instance. |
| */ |
| public void transferTo(InputChannel outParameter) { |
| if (outParameter == null) { |
| throw new IllegalArgumentException("outParameter must not be null"); |
| } |
| |
| nativeTransferTo(outParameter); |
| } |
| |
| /** |
| * Duplicates the input channel. |
| */ |
| public InputChannel dup() { |
| InputChannel target = new InputChannel(); |
| nativeDup(target); |
| return target; |
| } |
| |
| @Override |
| public int describeContents() { |
| return Parcelable.CONTENTS_FILE_DESCRIPTOR; |
| } |
| |
| public void readFromParcel(Parcel in) { |
| if (in == null) { |
| throw new IllegalArgumentException("in must not be null"); |
| } |
| |
| nativeReadFromParcel(in); |
| } |
| |
| @Override |
| public void writeToParcel(Parcel out, int flags) { |
| if (out == null) { |
| throw new IllegalArgumentException("out must not be null"); |
| } |
| |
| nativeWriteToParcel(out); |
| |
| if ((flags & PARCELABLE_WRITE_RETURN_VALUE) != 0) { |
| dispose(); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return getName(); |
| } |
| } |