package com.github.bigexcalibur.herovideo.ui.widget.banner;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.ImageView;

import java.util.List;

/**
 * Created by hcc on 16/8/7 21:18
 * [email protected]
 * <p/>
 * Banner适配器
 */
public class BannerAdapter extends PagerAdapter
{

    private List<ImageView> mList;

    private int pos;

    private ViewPagerOnItemClickListener mViewPagerOnItemClickListener;

    void setmViewPagerOnItemClickListener(ViewPagerOnItemClickListener mViewPagerOnItemClickListener)
    {

        this.mViewPagerOnItemClickListener = mViewPagerOnItemClickListener;
    }

    BannerAdapter(List<ImageView> list)
    {

        this.mList = list;
    }

    @Override
    public int getCount()
    {

        return Integer.MAX_VALUE;
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1)
    {

        return arg0 == arg1;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position)
    {

        //对ViewPager页号求模取出View列表中要显示的项
        position %= mList.size();
        if (position < 0)
        {
            position = mList.size() + position;
        }
        ImageView v = mList.get(position);
        pos = position;
        v.setScaleType(ImageView.ScaleType.CENTER);
        //如果View已经在之前添加到了一个父组件，则必须先remove，否则会抛出IllegalStateException。
        ViewParent vp = v.getParent();
        if (vp != null)
        {
            ViewGroup parent = (ViewGroup) vp;
            parent.removeView(v);
        }
        v.setOnClickListener(v1 -> {

            if (mViewPagerOnItemClickListener != null)
            {
                mViewPagerOnItemClickListener.onItemClick();
            }
        });


        container.addView(v);
        return v;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object)
    {

    }


    interface ViewPagerOnItemClickListener
    {

        void onItemClick();
    }
}