package com.example.smart.widget
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import android.content.Context
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import android.graphics.Color
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import android.os.Parcel
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import android.os.Parcelable
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import android.util.AttributeSet
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import android.view.ViewGroup
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import android.view.ViewTreeObserver
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import android.view.animation.AccelerateDecelerateInterpolator
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import android.view.animation.Interpolator
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import android.widget.LinearLayout
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import androidx.annotation.DrawableRes
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import androidx.core.view.ViewCompat
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import com.example.smart.observer.TabEventProvider
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import java.util.*
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/**
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* desc: 首页底部导航栏
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*/
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class HomeTabLayout @JvmOverloads constructor(
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context: Context,
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val tabProvider: TabEventProvider,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = 0,
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) : LinearLayout(context, attrs, defStyleAttr) {
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private val TRANSLATE_DURATION_MILLIS = 200
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private val mInterpolator: Interpolator =
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AccelerateDecelerateInterpolator()
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private var mVisible = true
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private lateinit var mTabLayout: LinearLayout
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private lateinit var mTabParams: LayoutParams
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private var mCurrentPosition = 0
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private lateinit var itemTabs: MutableList<HomeTabView>
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companion object {
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fun create(context: Context, tabProvider: TabEventProvider) =
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HomeTabLayout(context, tabProvider)
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fun buildItem(context: Context, @DrawableRes icon: Int?, tabName: String?) =
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HomeTabView(context, icon, tabName)
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}
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init {
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initView()
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}
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private fun initView() {
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itemTabs = ArrayList()
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mTabLayout = LinearLayout(context)
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mTabLayout.setBackgroundColor(Color.WHITE)
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mTabLayout.orientation = HORIZONTAL
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addView(
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mTabLayout,
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LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT
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)
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)
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}
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fun addItem(tab: HomeTabView): HomeTabLayout {
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// itemTabs.add(tab)
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tab.setTabPosition(mTabLayout.childCount)
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mTabParams = LayoutParams(0, ViewGroup.LayoutParams.MATCH_PARENT)
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mTabParams.weight = 1f
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tab.layoutParams = mTabParams
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tab.setOnClickListener {
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val pos = tab.getTabPosition()
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if (mCurrentPosition == pos) {
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tabProvider.tabClick(pos, pos)
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} else {
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tab.isSelected = true
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mTabLayout.getChildAt(mCurrentPosition).isSelected = false
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tabProvider.tabClick(pos, mCurrentPosition)
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mCurrentPosition = pos
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}
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}
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mTabLayout.addView(tab)
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return this
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}
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fun setCurrentItem(position: Int) {
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mTabLayout.post { mTabLayout.getChildAt(position).performClick() }
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}
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override fun onSaveInstanceState(): Parcelable {
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val superState = super.onSaveInstanceState()
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return SavedState(superState, mCurrentPosition)
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}
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override fun onRestoreInstanceState(state: Parcelable) {
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val ss = state as SavedState
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super.onRestoreInstanceState(ss.superState)
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if (mCurrentPosition != ss.position) {
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mTabLayout.getChildAt(mCurrentPosition).isSelected = false
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mTabLayout.getChildAt(ss.position).isSelected = true
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}
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mCurrentPosition = ss.position
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}
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class SavedState : BaseSavedState {
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var position = 0
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constructor(source: Parcel) : super(source) {
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position = source.readInt()
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}
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constructor(superState: Parcelable?, position: Int) : super(superState) {
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this.position = position
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}
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override fun writeToParcel(out: Parcel, flags: Int) {
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super.writeToParcel(out, flags)
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out.writeInt(position)
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}
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companion object CREATOR : Parcelable.Creator<SavedState> {
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override fun createFromParcel(parcel: Parcel): SavedState {
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return SavedState(parcel)
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}
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override fun newArray(size: Int): Array<SavedState?> {
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return arrayOfNulls(size)
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}
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}
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}
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fun hide() {
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hide(true)
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}
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fun show() {
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show(true)
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}
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fun hide(anim: Boolean) {
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toggle(false, anim, false)
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}
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fun show(anim: Boolean) {
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toggle(true, anim, false)
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}
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fun isVisible(): Boolean {
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return mVisible
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}
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fun toggle(visible: Boolean, anim: Boolean, force: Boolean) {
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if (mVisible != visible || force) {
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mVisible = visible
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val height = height
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if (height == 0 && !force) {
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val vto = viewTreeObserver
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if (vto.isAlive) {
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// view树完成测量并且分配空间而绘制过程还没有开始的时候播放动画。
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vto.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
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override fun onPreDraw(): Boolean {
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val currentVto = viewTreeObserver
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if (currentVto.isAlive) {
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// currentVto.removeOnPreDrawListener(object)
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}
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toggle(visible, anim, true)
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return true
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}
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})
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return
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}
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val translationY = if (visible) 0 else height
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if (anim) {
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animate().setInterpolator(mInterpolator)
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.setDuration(TRANSLATE_DURATION_MILLIS.toLong())
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.translationY(translationY.toFloat())
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} else {
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ViewCompat.setTranslationY(this, translationY.toFloat())
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}
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}
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}
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}
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}
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