package com.zhengsonglan.listview_loading.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.zhengsonglan.listview_loading.R;
import com.zhengsonglan.listview_loading.entity.UserEnity;

import java.util.List;

/**
 *
 */
public class MyAdapter extends BaseAdapter {
 Context context;
 LayoutInflater inflater;
 List<UserEnity> lists;

 private boolean scrollState=false;

 public void setScrollState(boolean scrollState) {
  this.scrollState = scrollState;
 }


 public MyAdapter(Context context, List<UserEnity> lists) {
  this.context=context;
  this.inflater=LayoutInflater.from(context);
  this.lists=lists;
 }

 @Override
 public int getCount() {
  return lists!=null?lists.size():0;
 }

 @Override
 public Object getItem(int position) {
  return lists.get(position);
 }

 @Override
 public long getItemId(int position) {
  return position;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder viewHolder;
  if (convertView == null) {
   convertView=inflater.inflate(R.layout.main_item,null,true);
   viewHolder=new ViewHolder();
   viewHolder.iv_icon= (ImageView) convertView.findViewById(R.id.main_item_iv_icon);
   viewHolder.tv_name= (TextView) convertView.findViewById(R.id.main_item_tv_name);
   convertView.setTag(viewHolder);
  } else {
   viewHolder= (ViewHolder) convertView.getTag();
  }


  UserEnity userEnity=lists.get(position);

  String img_url=userEnity.getIcon();
  if (!scrollState){
   viewHolder.tv_name.setText(userEnity.getName());
   viewHolder.tv_name.setTag(null);
   ImageLoader.getInstance().displayImage(img_url,viewHolder.iv_icon);
   viewHolder.iv_icon.setTag("1");

  }else{
   viewHolder.tv_name.setText("加載中");
   viewHolder.tv_name.setTag(userEnity.getName());
   viewHolder.iv_icon.setTag(img_url);
   viewHolder.iv_icon.setImageResource(R.mipmap.ic_launcher);

  }
  return convertView;

 }

 static class ViewHolder{
  TextView tv_name;
  ImageView iv_icon;
 }
}

//定義當前listview是否在滑動狀態
private boolean scrollState=false;
public void setScrollState(boolean scrollState) {
 this.scrollState = scrollState;
}

//實體類
UserEnity userEnity=lists.get(position);

if (!scrollState){//如果當前不是滑動的狀態，我們填充真數據
   //填充數據
   viewHolder.tv_name.setText(userEnity.getName());
   //設置Tag中數據為空表示數據已填充
   viewHolder.tv_name.setTag(null);
   //加載圖片
   ImageLoader.getInstance().displayImage(img_url,viewHolder.iv_icon);
   //設置tag為1表示已加載過數據
   viewHolder.iv_icon.setTag("1");

}else{//如果當前是滑動的狀態，我們填充假數據
   viewHolder.tv_name.setText("加載中");
   //將數據name保存在Tag當中
   viewHolder.tv_name.setTag(userEnity.getName());
   //將數據image_url保存在Tag當中
   viewHolder.iv_icon.setTag(img_url);
   //設置默認顯示圖片（最好是本地資源的圖片）
   viewHolder.iv_icon.setImageResource(R.mipmap.ic_launcher);

}

@Override
 public void onScrollStateChanged(AbsListView view, int scrollState) {
  switch (scrollState){

   case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://停止滾動
   {
    //設置為停止滾動
    myAdapter.setScrollState(false);
    //當前屏幕中listview的子項的個數
    int count = view.getChildCount();
    Log.e("MainActivity",count+"");

    for (int i = 0; i < count; i++) {
     //獲取到item的name
     TextView tv_name = (TextView) view.getChildAt(i).findViewById(R.id.main_item_tv_name);
     //獲取到item的頭像
     ImageView iv_show= (ImageView) view.getChildAt(i).findViewById(R.id.main_item_iv_icon);

     if (tv_name.getTag() != null) { //非null說明需要加載數據
      tv_name.setText(tv_name.getTag().toString());//直接從Tag中取出我們存儲的數據name并且賦值
      tv_name.setTag(null);//設置為已加載過數據
     }

     if (!iv_show.getTag().equals("1")){//!="1"說明需要加載數據
      String image_url=iv_show.getTag().toString();//直接從Tag中取出我們存儲的數據image——url
      ImageLoader.getInstance().displayImage(image_url, iv_show);//顯示圖片
      iv_show.setTag("1");//設置為已加載過數據
     }
    }
    break;
   }
   case AbsListView.OnScrollListener.SCROLL_STATE_FLING://滾動做出了拋的動作
   {
    //設置為正在滾動
    myAdapter.setScrollState(true);
    break;
   }

   case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL://正在滾動
   {
    //設置為正在滾動
    myAdapter.setScrollState(true);
    break;
   }
  }
 }