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/*
* Copyright (C) 2020 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.settings.widget;
import static com.google.common.truth.Truth.assertThat;
import android.os.Parcelable;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.viewpager.widget.PagerAdapter;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.util.Locale;
@RunWith(AndroidJUnit4.class)
public class RtlCompatibleViewPagerTest {
private Locale mLocaleEn;
private Locale mLocaleHe;
private RtlCompatibleViewPager mViewPager;
@Before
public void setUp() {
mViewPager = new RtlCompatibleViewPager(ApplicationProvider.getApplicationContext());
mViewPager.setAdapter(new ViewPagerAdapter());
mLocaleEn = new Locale("en");
mLocaleHe = new Locale("he");
}
@Test
public void testGetCurrentItem_shouldMaintainIndexDuringLocaleChange() {
testRtlCompatibleInner(0);
testRtlCompatibleInner(1);
}
private void testRtlCompatibleInner(int currentItem) {
// Set up the environment
Locale.setDefault(mLocaleEn);
mViewPager.setCurrentItem(currentItem);
assertThat(TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))
.isEqualTo(View.LAYOUT_DIRECTION_LTR);
assertThat(mViewPager.getCurrentItem()).isEqualTo(currentItem);
// Simulate to change the language to RTL
Parcelable savedInstance = mViewPager.onSaveInstanceState();
Locale.setDefault(mLocaleHe);
mViewPager.onRestoreInstanceState(savedInstance);
assertThat(TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))
.isEqualTo(View.LAYOUT_DIRECTION_RTL);
assertThat(mViewPager.getCurrentItem()).isEqualTo(currentItem);
}
/**
* Test viewpager adapter, uses 2 view to test it
*/
private static final class ViewPagerAdapter extends PagerAdapter {
private static final int ITEM_COUNT = 2;
private ViewPagerAdapter() {
}
@Override
public int getCount() {
return ITEM_COUNT;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
return null;
}
@Override
public CharSequence getPageTitle(int position) {
return null;
}
}
}
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