com.inno.wang.view.smartlayout.v13.ViewPagerItemAdapter.java Source code

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Here is the source code for com.inno.wang.view.smartlayout.v13.ViewPagerItemAdapter.java

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/**
 * Copyright (C) 2015 ogaclejapan
 *
 * 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.inno.wang.view.smartlayout.v13;

import android.support.v4.util.SparseArrayCompat;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.lang.ref.WeakReference;

public class ViewPagerItemAdapter extends PagerAdapter {

    private final ViewPagerItems pages;
    private final SparseArrayCompat<WeakReference<View>> holder;
    private final LayoutInflater inflater;

    public ViewPagerItemAdapter(ViewPagerItems pages) {
        this.pages = pages;
        this.holder = new SparseArrayCompat<>(pages.size());
        this.inflater = LayoutInflater.from(pages.getContext());
    }

    @Override
    public int getCount() {
        return pages.size();
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View view = getPagerItem(position).initiate(inflater, container);
        container.addView(view);
        holder.put(position, new WeakReference<View>(view));
        return view;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        holder.remove(position);
        container.removeView((View) object);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return object == view;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return getPagerItem(position).getTitle();
    }

    @Override
    public float getPageWidth(int position) {
        return getPagerItem(position).getWidth();
    }

    public View getPage(int position) {
        final WeakReference<View> weakRefItem = holder.get(position);
        return (weakRefItem != null) ? weakRefItem.get() : null;
    }

    protected ViewPagerItem getPagerItem(int position) {
        return pages.get(position);
    }
}