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/*
* Copyright (C) 2015 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.deskclock.timer;
import android.annotation.SuppressLint;
import android.util.ArrayMap;
import android.view.View;
import android.view.ViewGroup;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager.widget.PagerAdapter;
import com.android.deskclock.data.DataModel;
import com.android.deskclock.data.Timer;
import com.android.deskclock.data.TimerListener;
import java.util.List;
import java.util.Map;
/**
* This adapter produces a {@link TimerItemFragment} for each timer.
*/
class TimerPagerAdapter extends PagerAdapter implements TimerListener {
private final FragmentManager mFragmentManager;
/** Maps each timer id to the corresponding {@link TimerItemFragment} that draws it. */
private final Map<Integer, TimerItemFragment> mFragments = new ArrayMap<>();
/** The current fragment transaction in play or {@code null}. */
private FragmentTransaction mCurrentTransaction;
/** The {@link TimerItemFragment} that is current visible on screen. */
private Fragment mCurrentPrimaryItem;
public TimerPagerAdapter(FragmentManager fragmentManager) {
mFragmentManager = fragmentManager;
}
@Override
public int getCount() {
return getTimers().size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return ((Fragment) object).getView() == view;
}
@Override
public int getItemPosition(Object object) {
final TimerItemFragment fragment = (TimerItemFragment) object;
final Timer timer = fragment.getTimer();
final int position = getTimers().indexOf(timer);
return position == -1 ? POSITION_NONE : position;
}
@Override
@SuppressLint("CommitTransaction")
public Fragment instantiateItem(ViewGroup container, int position) {
if (mCurrentTransaction == null) {
mCurrentTransaction = mFragmentManager.beginTransaction();
}
final Timer timer = getTimers().get(position);
// Search for the existing fragment by tag.
final String tag = getClass().getSimpleName() + timer.getId();
TimerItemFragment fragment = (TimerItemFragment) mFragmentManager.findFragmentByTag(tag);
if (fragment != null) {
// Reattach the existing fragment.
mCurrentTransaction.attach(fragment);
} else {
// Create and add a new fragment.
fragment = TimerItemFragment.newInstance(timer);
mCurrentTransaction.add(container.getId(), fragment, tag);
}
if (fragment != mCurrentPrimaryItem) {
setItemVisible(fragment, false);
}
mFragments.put(timer.getId(), fragment);
return fragment;
}
@Override
@SuppressLint("CommitTransaction")
public void destroyItem(ViewGroup container, int position, Object object) {
final TimerItemFragment fragment = (TimerItemFragment) object;
if (mCurrentTransaction == null) {
mCurrentTransaction = mFragmentManager.beginTransaction();
}
mFragments.remove(fragment.getTimerId());
mCurrentTransaction.remove(fragment);
}
@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
final Fragment fragment = (Fragment) object;
if (fragment != mCurrentPrimaryItem) {
if (mCurrentPrimaryItem != null) {
setItemVisible(mCurrentPrimaryItem, false);
}
mCurrentPrimaryItem = fragment;
if (mCurrentPrimaryItem != null) {
setItemVisible(mCurrentPrimaryItem, true);
}
}
}
@Override
public void finishUpdate(ViewGroup container) {
if (mCurrentTransaction != null) {
mCurrentTransaction.commitAllowingStateLoss();
mCurrentTransaction = null;
if (!mFragmentManager.isDestroyed()) {
mFragmentManager.executePendingTransactions();
}
}
}
@Override
public void timerAdded(Timer timer) {
notifyDataSetChanged();
}
@Override
public void timerRemoved(Timer timer) {
notifyDataSetChanged();
}
@Override
public void timerUpdated(Timer before, Timer after) {
final TimerItemFragment timerItemFragment = mFragments.get(after.getId());
if (timerItemFragment != null) {
timerItemFragment.updateTime();
}
}
/**
* @return {@code true} if at least one timer is in a state requiring continuous updates
*/
boolean updateTime() {
boolean continuousUpdates = false;
for (TimerItemFragment fragment : mFragments.values()) {
continuousUpdates |= fragment.updateTime();
}
return continuousUpdates;
}
Timer getTimer(int index) {
return getTimers().get(index);
}
private List<Timer> getTimers() {
return DataModel.getDataModel().getTimers();
}
private static void setItemVisible(Fragment item, boolean visible) {
item.setMenuVisibility(visible);
item.setUserVisibleHint(visible);
}
}
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