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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 com.android.systemui.settings;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import com.android.systemui.broadcast.BroadcastDispatcher;
/**
* A class that has an observable for the current user.
*/
public class CurrentUserObservable {
private final CurrentUserTracker mTracker;
private final MutableLiveData<Integer> mCurrentUser = new MutableLiveData<Integer>() {
@Override
protected void onActive() {
super.onActive();
mTracker.startTracking();
}
@Override
protected void onInactive() {
super.onInactive();
mTracker.stopTracking();
}
};
public CurrentUserObservable(BroadcastDispatcher broadcastDispatcher) {
mTracker = new CurrentUserTracker(broadcastDispatcher) {
@Override
public void onUserSwitched(int newUserId) {
mCurrentUser.setValue(newUserId);
}
};
}
/**
* Returns the current user that can be observed.
*/
public LiveData<Integer> getCurrentUser() {
if (mCurrentUser.getValue() == null) {
mCurrentUser.setValue(mTracker.getCurrentUserId());
}
return mCurrentUser;
}
}
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