blob: 5ca901faf48ad796bcc2bb6c82de53b8eb0b0094 [file] [log] [blame]
/*
* Copyright (C) 2018 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.example.android.intentplayground;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import java.util.List;
import java.util.function.Consumer;
public class BaseActivityViewModel extends ViewModel {
enum FabAction {Show, Hide}
private final MutableLiveData<FabAction> mFabActions;
/**
* Republish {@link BaseActivity#addTrackerListener(Consumer)} in a lifecycle safe manner.
* The {@link BaseActivity#addTrackerListener(Consumer)} that is registered in this class,
* forwards the value to this, to enjoy all the guarantees {@link import
* androidx.lifecycle.LiveData;} gives.
*/
private final MutableLiveData<List<Tracking.Task>> mRefreshTree;
private final Consumer<List<Tracking.Task>> mTrackingListener;
public BaseActivityViewModel() {
mFabActions = new MutableLiveData<>();
mRefreshTree = new MutableLiveData<>();
mTrackingListener = tasks -> mRefreshTree.setValue(tasks);
BaseActivity.addTrackerListener(mTrackingListener);
}
public void actOnFab(FabAction action) {
mFabActions.setValue(action);
}
public LiveData<FabAction> getFabActions() {
return mFabActions;
}
/**
* @return LiveData that publishes the new state of {@link com.android.server.wm.Task} and
* {@link android.app.Activity}-s whenever that state has been changed.
*/
public LiveData<List<Tracking.Task>> getRefresh() {
return mRefreshTree;
}
@Override
public void onCleared() {
BaseActivity.removeTrackerListener(mTrackingListener);
}
}