| // Copyright (C) 2016 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.google.reviewit.util; |
| |
| import android.view.View; |
| import android.view.Window; |
| |
| import com.google.reviewit.R; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public class TaskObserver { |
| private final AtomicInteger runningTasks = new AtomicInteger(0); |
| private OnChangeListener listener; |
| |
| private static TaskObserver INSTANCE = new TaskObserver(); |
| |
| public static TaskObserver get() { |
| return INSTANCE; |
| } |
| |
| public static void enableProgressBar(final Window window) { |
| get().setOnChangeListener(new TaskObserver.OnChangeListener() { |
| @Override |
| public void onChange(int running) { |
| if (running > 0) { |
| window.findViewById(R.id.progress).setVisibility(View.VISIBLE); |
| } else { |
| window.findViewById(R.id.progress).setVisibility(View.INVISIBLE); |
| } |
| } |
| }); |
| } |
| |
| public static void clear() { |
| get().setOnChangeListener(null); |
| } |
| |
| public void taskStarted() { |
| int running = runningTasks.addAndGet(1); |
| if (listener != null) { |
| listener.onChange(running); |
| } |
| } |
| |
| public void taskDone() { |
| int running = runningTasks.addAndGet(-1); |
| if (listener != null) { |
| listener.onChange(running); |
| } |
| } |
| |
| public void setOnChangeListener(OnChangeListener onChangeListener) { |
| listener = onChangeListener; |
| } |
| |
| public interface OnChangeListener { |
| void onChange(int running); |
| } |
| } |