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 androidx.core.content.ContextCompat
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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 org.jetbrains.anko.dip
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/**
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* 简单的带上拉自动加载更多的系统SwipeRefreshLayout+RecyclerView
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*/
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class SwipeRefreshRecyclerLayout : SwipeRefreshLayout, SwipeRefreshLayout.OnRefreshListener {
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lateinit var mRecyclerView: RecyclerView
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var loadMoreTextColor:Int = 0
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private var loadMoreView: TextView? = null
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private var mAdapter: RecyclerView.Adapter<*>? = null
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private var isLoadMore = false
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private var mode = Mode.Both
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private var onRefreshListener: OnRefreshListener? = null
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private var lastVisibleItem = 0
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private var lastPositions: IntArray? = null
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private var loadMoreBgColor = Color.TRANSPARENT
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constructor(context: Context) : super(context) {
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init()
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}
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constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {
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init()
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}
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internal fun init() {
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mRecyclerView = RecyclerView(context)
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mRecyclerView.setHasFixedSize(true)
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mRecyclerView.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
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loadMoreTextColor = ContextCompat.getColor(context,R.color.textColor)
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addView(mRecyclerView)
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setOnRefreshListener(this)
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setMode(mode)
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}
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private val onScrollListener = object : RecyclerView.OnScrollListener() {
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override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
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super.onScrollStateChanged(recyclerView, newState)
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val adapter = recyclerView!!.adapter
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resetLastVisibleItem()
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//拖动完成。并在最底部
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if (newState == RecyclerView.SCROLL_STATE_IDLE && adapter != null
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&& lastVisibleItem + 1 == adapter.itemCount && !isRefreshing && !isLoadMore) {
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if (adapter is HFRecyclerAdapter<*>) {
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if (loadMoreView != null) {
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loadMoreView?.text = "正在载入..."
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loadMoreView?.visibility = View.VISIBLE
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}
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isLoadMore = true
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if (mode == Mode.Both) {
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//设置下拉不可用。
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isEnabled = false
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}
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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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} else if (newState == RecyclerView.SCROLL_STATE_DRAGGING && adapter != null
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&& lastVisibleItem + 1 == adapter.itemCount && !isRefreshing && !isLoadMore) {
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//拖动中，并在最底部
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if (adapter is HFRecyclerAdapter<*>) {
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if (loadMoreView != null) {
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loadMoreView?.text = "松开载入更多"
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loadMoreView?.visibility = View.VISIBLE
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}
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}
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}
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}
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override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
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super.onScrolled(recyclerView, dx, dy)
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}
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}
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fun smoothScrollToPosition(position: Int) {
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mRecyclerView.smoothScrollToPosition(position)
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}
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fun setAdapter(adapter: RecyclerView.Adapter<*>?) {
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mAdapter = adapter
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mRecyclerView.adapter = mAdapter
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if (mode == Mode.Both || mode == Mode.Bottom) {
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initLoadMore()
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}
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}
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fun setLayoutManager(layoutManager: RecyclerView.LayoutManager) {
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mRecyclerView.layoutManager = layoutManager
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}
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fun addItemDecoration(itemDecoration: RecyclerView.ItemDecoration) {
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mRecyclerView.addItemDecoration(itemDecoration)
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}
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fun removeItemDecoration(decoration: RecyclerView.ItemDecoration) {
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mRecyclerView.removeItemDecoration(decoration)
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}
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fun setOnRefreshListener(onRefreshListener: OnRefreshListener) {
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this.onRefreshListener = onRefreshListener
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}
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fun setMode(mode: Mode) {
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this.mode = mode
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when {
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mode === Mode.None -> {
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this.isEnabled = false
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mRecyclerView.removeOnScrollListener(onScrollListener)
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}
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mode === Mode.Both -> {
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mRecyclerView.addOnScrollListener(onScrollListener)
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initLoadMore()
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}
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mode === Mode.Bottom -> {
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mRecyclerView.addOnScrollListener(onScrollListener)
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this.isEnabled = false
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initLoadMore()
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}
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else -> {
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mRecyclerView.removeOnScrollListener(onScrollListener)
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this.isEnabled = true
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}
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}
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}
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private fun initLoadMore() {
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if (mAdapter is HFRecyclerAdapter<*>) {
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if (loadMoreView != null) {
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return
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}
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loadMoreView = TextView(context)
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loadMoreView?.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
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loadMoreView?.setBackgroundColor(loadMoreBgColor)
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loadMoreView?.text = "正在载入..."
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val textSize = resources.getDimensionPixelSize(R.dimen.textSize)
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loadMoreView?.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize.toFloat())
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loadMoreView?.setTextColor(loadMoreTextColor)
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loadMoreView?.gravity = Gravity.CENTER
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loadMoreView?.setPadding(0, dip(16), 0,dip(16))
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(mAdapter as HFRecyclerAdapter<*>).setFooterView(loadMoreView!!)
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}
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}
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fun setLoadMoreText(text: CharSequence) {
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//如果是不带上拉更多的页面
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if (mode == Mode.Top || mode == Mode.None) {
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initLoadMore()
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}
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if (loadMoreView != null) {
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loadMoreView?.text = text
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if (loadMoreView?.visibility != View.VISIBLE) {
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loadMoreView?.visibility = 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 fun resetLastVisibleItem() {
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val layoutManager = mRecyclerView.layoutManager
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if (layoutManager != null && layoutManager is LinearLayoutManager) {
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lastVisibleItem = layoutManager.findLastVisibleItemPosition()
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} else if (layoutManager != null && layoutManager is StaggeredGridLayoutManager) {
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val staggeredGridLayoutManager = layoutManager
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if (lastPositions == null) {
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lastPositions = IntArray(staggeredGridLayoutManager.spanCount)
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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 fun findMax(lastPositions: IntArray): Int {
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val max = lastPositions.max() ?: lastPositions[0]
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return max
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}
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override fun onRefresh() {
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//如果正在上拉。不执行操作
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if (isLoadMore) {
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return
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}
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isRefreshing = true
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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 fun setRefreshing(refreshing: Boolean) {
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//如果当前状态是上拉更多。
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if (isLoadMore) {
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if (mode == Mode.Both) {
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isEnabled = true
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}
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}
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//重置系统下拉刷新状态。
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if (mode == Mode.Both || mode == Mode.Top) {
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if (loadMoreView != null) {
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loadMoreView?.visibility = View.GONE
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}
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super.setRefreshing(refreshing)
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}
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//重置系统上拉更多状态。
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if (mode == Mode.Bottom || mode == Mode.Both) {
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this.isLoadMore = refreshing
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if (loadMoreView != null) {
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loadMoreView?.visibility = View.GONE
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}
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}
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}
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enum class Mode {
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None, Both, Top, Bottom
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}
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interface OnRefreshListener {
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fun onRefresh()
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fun onLoadMore()
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}
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}
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