Merge "Adding a compat class to listen for exclusion rect changes" into qt-dev

/**

 * 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 com.android.systemui.shared.system;

import android.graphics.Region;

import android.os.RemoteException;

import android.util.Log;

import android.view.ISystemGestureExclusionListener;

import android.view.WindowManagerGlobal;

/**

 * Utility class to listen for exclusion rect changes.

 */

public abstract class SystemGestureExclusionListenerCompat {

    private static final String TAG = "SGEListenerCompat";

    private final int mDisplayId;

    private ISystemGestureExclusionListener mGestureExclusionListener =

            new ISystemGestureExclusionListener.Stub() {

                @Override

                public void onSystemGestureExclusionChanged(int displayId,

                        Region systemGestureExclusion) {

                    if (displayId == mDisplayId) {

                        onExclusionChanged(systemGestureExclusion);

                    }

                }

            };

    private boolean mRegistered;

    public SystemGestureExclusionListenerCompat(int displayId) {

        mDisplayId = displayId;

    }

    /**

     * Called when the exclusion region has changed

     */

    public abstract void onExclusionChanged(Region systemGestureExclusion);

    /**

     * Registers the listener for getting exclusion rect changes.

     */

    public void register() {

        if (!mRegistered) {

            try {

                WindowManagerGlobal.getWindowManagerService()

                        .registerSystemGestureExclusionListener(

                                mGestureExclusionListener, mDisplayId);

                mRegistered = true;

            } catch (RemoteException e) {

                Log.e(TAG, "Failed to register window manager callbacks", e);

            }

        }

    }

    /**

     * Unregisters the receiver if previously registered

     */

    public void unregister() {

        if (mRegistered) {

            try {

                WindowManagerGlobal.getWindowManagerService()

                        .unregisterSystemGestureExclusionListener(

                                mGestureExclusionListener, mDisplayId);

                mRegistered = false;

            } catch (RemoteException e) {

                Log.e(TAG, "Failed to unregister window manager callbacks", e);

            }

        }

    }

}