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/*
* Copyright (C) 2022 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 com.android.server.input;
import static android.os.InputConstants.DEFAULT_DISPATCHING_TIMEOUT_MILLIS;
import android.os.IBinder;
import android.os.InputConfig;
import android.view.InputApplicationHandle;
import android.view.InputChannel;
import android.view.InputMonitor;
import android.view.InputWindowHandle;
import android.view.SurfaceControl;
import android.view.WindowManager;
/**
* An internal implementation of an {@link InputMonitor} that uses a spy window.
*
* This spy window is a layer container in the SurfaceFlinger hierarchy that does not have any
* graphical buffer, but can still receive input. It is parented to the DisplayContent so
* that it can spy on any pointer events that start in the DisplayContent bounds. When the
* object is constructed, it will add itself to SurfaceFlinger.
*/
class GestureMonitorSpyWindow {
final InputApplicationHandle mApplicationHandle;
final InputWindowHandle mWindowHandle;
// The token, InputChannel, and SurfaceControl are owned by this object.
final IBinder mMonitorToken;
final InputChannel mClientChannel;
final SurfaceControl mInputSurface;
GestureMonitorSpyWindow(IBinder token, String name, int displayId, int pid, int uid,
SurfaceControl sc, InputChannel inputChannel) {
mMonitorToken = token;
mClientChannel = inputChannel;
mInputSurface = sc;
mApplicationHandle = new InputApplicationHandle(null, name,
DEFAULT_DISPATCHING_TIMEOUT_MILLIS);
mWindowHandle = new InputWindowHandle(mApplicationHandle, displayId);
mWindowHandle.name = name;
mWindowHandle.token = mClientChannel.getToken();
mWindowHandle.layoutParamsType = WindowManager.LayoutParams.TYPE_SECURE_SYSTEM_OVERLAY;
mWindowHandle.dispatchingTimeoutMillis = DEFAULT_DISPATCHING_TIMEOUT_MILLIS;
mWindowHandle.ownerPid = pid;
mWindowHandle.ownerUid = uid;
mWindowHandle.scaleFactor = 1.0f;
mWindowHandle.replaceTouchableRegionWithCrop(null /* use this surface's bounds */);
mWindowHandle.inputConfig =
InputConfig.NOT_FOCUSABLE | InputConfig.SPY | InputConfig.TRUSTED_OVERLAY;
final SurfaceControl.Transaction t = new SurfaceControl.Transaction();
t.setInputWindowInfo(mInputSurface, mWindowHandle);
t.setLayer(mInputSurface, Integer.MAX_VALUE);
t.setPosition(mInputSurface, 0, 0);
t.setCrop(mInputSurface, null /* crop to parent surface */);
t.show(mInputSurface);
t.apply();
}
void remove() {
final SurfaceControl.Transaction t = new SurfaceControl.Transaction();
t.hide(mInputSurface);
t.remove(mInputSurface);
t.apply();
mClientChannel.dispose();
}
String dump() {
return "name='" + mWindowHandle.name + "', inputChannelToken="
+ mClientChannel.getToken() + " displayId=" + mWindowHandle.displayId;
}
}
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