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.view.View
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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.LinearSnapHelper
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import androidx.recyclerview.widget.RecyclerView
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import cn.sinata.xldutils.R
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import cn.sinata.xldutils.adapter.BaseRecyclerAdapter
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import cn.sinata.xldutils.sysErr
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import org.jetbrains.anko.collections.forEachWithIndex
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import org.jetbrains.anko.textColor
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/**
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* RecyclerView实现的wheel,因为item的textview是写死的50dp所以，如果要展示n行，请设置view高度为n*50dp
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*/
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class RWheelView : RecyclerView {
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private val mItems = ArrayList<WheelItem>()
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constructor(context: Context) : super(context)
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constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
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constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle)
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init {
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//默认垂直
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setHasFixedSize(true)
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layoutManager = LinearLayoutManager(context)
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//滑动停止居中
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val snapHelper = WheelSnapHelper()
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snapHelper.attachToRecyclerView(this)
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adapter = WheelAdapter(mItems)
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addOnScrollListener(object : OnScrollListener() {
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var mScrolled = false
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override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
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super.onScrollStateChanged(recyclerView, newState)
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if (newState == SCROLL_STATE_IDLE && mScrolled) {
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mScrolled = false
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postDelayed({
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val p = getSelectPosition()
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mItems.forEachWithIndex { i, wheelItem ->
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wheelItem.isSelected = i == p
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}
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adapter!!.notifyDataSetChanged()
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getSelectItem()
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}, 200)//延时200毫秒
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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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if (dx != 0 || dy != 0) {
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if (!mScrolled) {
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mItems.forEach { it.isSelected = false }
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adapter!!.notifyDataSetChanged()
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}
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mScrolled = true
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}
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}
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})
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}
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fun setItems(items: ArrayList<String>) {
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mItems.clear()
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//前后增加一个占位空白textView
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mItems.add(WheelItem(""))
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items.forEach {
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mItems.add(WheelItem(it))
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}
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mItems.add(WheelItem(""))
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adapter!!.notifyDataSetChanged()
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}
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private fun getSelectPosition(): Int {
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var position = 0
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if (layoutManager != null && layoutManager is LinearLayoutManager) {
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position = (layoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
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}
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return position + 1
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}
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fun getSelectItem(): String {
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var position = 0
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if (layoutManager != null && layoutManager is LinearLayoutManager) {
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position = (layoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
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if (position < adapter!!.itemCount - 1) {
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sysErr(mItems[position + 1])
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}
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}
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return mItems[position + 1].content
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}
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inner class WheelAdapter(mData: ArrayList<WheelItem>) : BaseRecyclerAdapter<WheelItem>(mData, R.layout.item_wheel_text) {
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override fun onBind(holder: cn.sinata.xldutils.adapter.util.ViewHolder, position: Int, data: WheelItem) {
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val contentView = holder.bind<TextView>(R.id.tv_content)
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contentView.text = data.content
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if (data.isSelected) {
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contentView.textColor = Color.parseColor("#333333")
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} else {
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contentView.textColor = Color.parseColor("#999999")
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}
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}
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}
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inner class WheelSnapHelper : LinearSnapHelper() {
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override fun calculateDistanceToFinalSnap(layoutManager: LayoutManager, targetView: View): IntArray? {
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val distance = super.calculateDistanceToFinalSnap(layoutManager, targetView)
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getSelectItem()
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return distance
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}
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}
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data class WheelItem(val content: String) {
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var isSelected = false
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}
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}
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