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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.customization.picker;
import static androidx.core.view.ViewCompat.LAYOUT_DIRECTION_RTL;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.LayoutRes;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.core.view.ViewCompat;
import androidx.viewpager.widget.PagerAdapter;
import com.android.customization.picker.BasePreviewAdapter.PreviewPage;
import com.android.wallpaper.util.SizeCalculator;
import com.android.wallpaper.widget.PreviewPager;
import java.util.ArrayList;
import java.util.List;
/**
* Base adapter for {@link PreviewPager}.
* It can be used as-is by creating an extension of {@link PreviewPage} and adding pages via
* {@link #addPage(PreviewPage)}
* @param <T> the type of {@link PreviewPage} that this adapter will handle.
*/
public class BasePreviewAdapter<T extends PreviewPage> extends PagerAdapter {
private final int mPreviewCardResId;
private final Context mContext;
private final LayoutInflater mInflater;
protected final List<T> mPages = new ArrayList<>();
protected BasePreviewAdapter(Context context, @LayoutRes int previewCardResId) {
mContext = context;
mPreviewCardResId = previewCardResId;
mInflater = LayoutInflater.from(mContext);
}
protected void addPage(T p) {
mPages.add(p);
}
@Override
public int getCount() {
return mPages.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == ((PreviewPage) object).card;
}
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
if (ViewCompat.getLayoutDirection(container) == LAYOUT_DIRECTION_RTL) {
position = mPages.size() - 1 - position;
}
CardView card = (CardView) mInflater.inflate(mPreviewCardResId, container, false);
T page = mPages.get(position);
page.setCard(card);
page.bindPreviewContent();
if (card.getParent() != null) {
container.removeView(card);
}
container.addView(card);
return page;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position,
@NonNull Object object) {
View card = ((PreviewPage) object).card;
((PreviewPage) object).card = null;
if (card.getParent() == container) {
container.removeView(card);
}
}
/**
* Represents a possible page in a {@link PreviewPager}, based on a CardView container.
* Override {@link #bindPreviewContent()} to bind the contents of the page when instantiated.
*/
public static abstract class PreviewPage {
protected final String title;
protected CardView card;
private Activity mActivity;
protected PreviewPage(String title, Activity activity) {
this.title = title;
mActivity = activity;
}
public void setCard(CardView card) {
card.addOnLayoutChangeListener(
new View.OnLayoutChangeListener() {
@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom,
int oldLeft, int oldTop, int oldRight, int oldBottom) {
card.setRadius(SizeCalculator.getPreviewCornerRadius(
mActivity, card.getMeasuredWidth()));
card.removeOnLayoutChangeListener(this);
}
});
this.card = card;
}
public abstract void bindPreviewContent();
}
}
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