package cn.sinata.xldutils.view;
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import android.content.Context;
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import android.graphics.Color;
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import android.util.AttributeSet;
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import android.util.TypedValue;
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import android.view.Gravity;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.TextView;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.StaggeredGridLayoutManager;
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import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
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import cn.sinata.xldutils.R;
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import cn.sinata.xldutils.adapter.HFRecyclerAdapter;
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import cn.sinata.xldutils.utils.DensityUtil;
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/**
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*
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* Created by liaoxiang on 16/3/28.
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*/
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public class SwipeRefreshRecyclerLayout extends SwipeRefreshLayout implements SwipeRefreshLayout.OnRefreshListener {
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private RecyclerView mRecyclerView;
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private TextView loadMoreView;
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private RecyclerView.Adapter mAdapter;
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private boolean isLoadMore = false;
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private Mode mode = Mode.Both;
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private OnRefreshListener onRefreshListener;
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private int lastVisibleItem = 0;
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private int[] lastPositions ;
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public SwipeRefreshRecyclerLayout(Context context) {
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super(context);
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init();
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}
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public SwipeRefreshRecyclerLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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init();
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}
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void init(){
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mRecyclerView = new RecyclerView(getContext());
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mRecyclerView.setHasFixedSize(true);
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mRecyclerView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
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addView(mRecyclerView);
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setOnRefreshListener(this);
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}
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private RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
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@Override
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public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
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super.onScrollStateChanged(recyclerView, newState);
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RecyclerView.Adapter adapter =recyclerView.getAdapter();
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resetLastVisibleItem();
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if (newState == RecyclerView.SCROLL_STATE_IDLE && adapter != null
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&& lastVisibleItem + 1 == adapter.getItemCount() && !isRefreshing() && !isLoadMore) {
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if (adapter instanceof HFRecyclerAdapter){
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if (loadMoreView!=null ){
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loadMoreView.setText("载入更多...");
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loadMoreView.setVisibility(View.VISIBLE);
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}
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isLoadMore = true;
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if (onRefreshListener!=null){
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onRefreshListener.onLoadMore();
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}
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}
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}
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}
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};
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public RecyclerView getRecyclerView(){
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return mRecyclerView;
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}
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public void setAdapter(RecyclerView.Adapter adapter){
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mAdapter = adapter;
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mRecyclerView.setAdapter(mAdapter);
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if (mode == Mode.Both){
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initLoadMore();
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}
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}
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public void setLayoutManager(RecyclerView.LayoutManager layoutManager){
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mRecyclerView.setLayoutManager(layoutManager);
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}
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public void addItemDecoration(RecyclerView.ItemDecoration itemDecoration){
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mRecyclerView.addItemDecoration(itemDecoration);
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}
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public void setOnRefreshListener(OnRefreshListener onRefreshListener){
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this.onRefreshListener = onRefreshListener;
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}
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public void setMode(Mode mode){
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this.mode = mode;
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if (mode == Mode.Both){
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mRecyclerView.addOnScrollListener(onScrollListener);
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initLoadMore();
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}else {
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mRecyclerView.removeOnScrollListener(onScrollListener);
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}
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}
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private void initLoadMore(){
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if (mAdapter instanceof HFRecyclerAdapter) {
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if (loadMoreView!=null){
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return;
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}
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loadMoreView = new TextView(getContext());
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loadMoreView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
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// loadMoreView.setHeight(DensityUtil.dip2px(this,48));
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loadMoreView.setBackgroundColor(Color.WHITE);
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loadMoreView.setText("载入更多...");
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loadMoreView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
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loadMoreView.setTextColor(getResources().getColor(R.color.textColor));
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loadMoreView.setGravity(Gravity.CENTER);
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loadMoreView.setPadding(0, DensityUtil.dip2px(getContext(), 16), 0, DensityUtil.dip2px(getContext(), 16));
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((HFRecyclerAdapter) mAdapter).setFooterView(loadMoreView);
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}
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}
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public void setLoadMoreText(CharSequence text){
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if (loadMoreView!=null){
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loadMoreView.setText(text);
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if (loadMoreView.getVisibility() != View.VISIBLE){
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loadMoreView.setVisibility(View.VISIBLE);
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}
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}
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}
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/**
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* 重新获取可见item的位置
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*/
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private void resetLastVisibleItem(){
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RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
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if (layoutManager != null && layoutManager instanceof LinearLayoutManager) {
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lastVisibleItem = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
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}else if (layoutManager!=null && layoutManager instanceof StaggeredGridLayoutManager){
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StaggeredGridLayoutManager staggeredGridLayoutManager =((StaggeredGridLayoutManager) layoutManager);
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if (lastPositions == null) {
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lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
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}
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staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
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lastVisibleItem = findMax(lastPositions);
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}
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}
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private int findMax(int[] lastPositions) {
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int max = lastPositions[0];
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for (int value : lastPositions) {
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if (value > max) {
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max = value;
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}
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}
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return max;
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}
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@Override
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public void onRefresh() {
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if (onRefreshListener!=null){
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onRefreshListener.onRefresh();
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}
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}
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/**
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* 设置刷新状态
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* @param refreshing 刷新状态
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*/
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@Override
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public void setRefreshing(boolean refreshing){
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super.setRefreshing(refreshing);
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this.isLoadMore = refreshing;
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if (loadMoreView!=null ){
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loadMoreView.setVisibility(View.GONE);
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}
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}
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public enum Mode{
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Both,Top
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}
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public interface OnRefreshListener {
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void onRefresh();
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void onLoadMore();
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}
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}
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