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/*
* Copyright (C) 2019 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.NonNull;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;
/**
* An {@code InputMonitor} allows privileged applications and components to monitor streams of
* {@link InputEvent}s without having to be the designated recipient for the event.
*
* For example, focus dispatched events would normally only go to the focused window on the
* targeted display, but an {@code InputMonitor} will also receive a copy of that event if they're
* registered to monitor that type of event on the targeted display.
*
* @hide
*/
public final class InputMonitor implements Parcelable {
private static final String TAG = "InputMonitor";
private static final boolean DEBUG = false;
public static final Parcelable.Creator<InputMonitor> CREATOR =
new Parcelable.Creator<InputMonitor>() {
public InputMonitor createFromParcel(Parcel source) {
return new InputMonitor(source);
}
public InputMonitor[] newArray(int size) {
return new InputMonitor[size];
}
};
@NonNull
private final String mName;
@NonNull
private final InputChannel mChannel;
@NonNull
private final IInputMonitorHost mHost;
public InputMonitor(@NonNull String name, @NonNull InputChannel channel,
@NonNull IInputMonitorHost host) {
mName = name;
mChannel = channel;
mHost = host;
}
public InputMonitor(Parcel in) {
mName = in.readString();
mChannel = in.readParcelable(null);
mHost = IInputMonitorHost.Stub.asInterface(in.readStrongBinder());
}
/**
* Get the {@link InputChannel} corresponding to this InputMonitor
*/
public InputChannel getInputChannel() {
return mChannel;
}
/**
* Get the name of this channel.
*/
public String getName() {
return mName;
}
/**
* Takes all of the current pointer events streams that are currently being sent to this
* monitor and generates appropriate cancellations for the windows that would normally get
* them.
*
* This method should be used with caution as unexpected pilfering can break fundamental user
* interactions.
*/
public void pilferPointers() {
try {
mHost.pilferPointers();
} catch (RemoteException e) {
e.rethrowFromSystemServer();
}
}
/**
* Disposes the input monitor.
*
* Explicitly release all of the resources this monitor is holding on to (e.g. the
* InputChannel). Once this method is called, this monitor and any resources it's provided may
* no longer be used.
*/
public void dispose() {
mChannel.dispose();
try {
mHost.dispose();
} catch (RemoteException e) {
e.rethrowFromSystemServer();
}
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeString(mName);
out.writeParcelable(mChannel, flags);
out.writeStrongBinder(mHost.asBinder());
}
@Override
public int describeContents() {
return 0;
}
@Override
public String toString() {
return "InputMonitor{mName=" + mName + ", mChannel=" + mChannel + ", mHost=" + mHost + "}";
}
}
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