package com.xk.eyepetizer.ui.view.home import android.animation.Animator import android.animation.ValueAnimator import android.content.Context import android.support.v4.view.ViewPager import android.support.v7.widget.RecyclerView import android.util.AttributeSet import android.view.Gravity import android.view.MotionEvent import android.view.ViewGroup import android.view.animation.Animation import android.view.animation.LinearInterpolator import android.view.animation.RotateAnimation import android.widget.ImageView import android.widget.RelativeLayout import com.example.v1.xklibrary.LogUtil import com.xk.eyepetizer.R import com.xk.eyepetizer.ui.view.home.banner.HomeBanner /** * Created by xuekai on 2017/8/23. */ class PullRecyclerView : RecyclerView { constructor(context: Context) : this(context, null) constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0) constructor(context: Context, attrs: AttributeSet?, defStyle: Int) : super(context, attrs, defStyle) { overScrollMode = OVER_SCROLL_NEVER } val pullDistance = 300//下拉高度达到这个的时候，松开手才会刷新 var originalFirstItemHeight = 0 var originalFirstItemWeight = 0 var downY = -1 //down之后下次up之前，这个值不变，用来实现loading的缩放比例 var constDownY = -1 var constUpY = -1f var canRefresh = false var isFirstMove = true var tempWidth = -1 var dx = 0 var homeBanner: HomeBanner? = null var willRefresh = false//松手后可刷新 var mLastMotionY = 0f var mLastMotionX = 0f var deltaY = 0f var deleaX = 0f override fun onInterceptTouchEvent(e: MotionEvent?): Boolean { var resume = super.onInterceptTouchEvent(e) when (e?.action) { MotionEvent.ACTION_DOWN -> { // 发生down事件时,记录y坐标 mLastMotionY = e.y mLastMotionX = e.x downY = e.y.toInt() constDownY = e.y.toInt() resume = false; } MotionEvent.ACTION_MOVE -> { // deltaY > 0 是向下运动,< 0是向上运动 deltaY = e.y.minus(mLastMotionY) deleaX = e.x.minus(mLastMotionX) if (Math.abs(deleaX) > Math.abs(deltaY)) { resume = false; } else { //当前正处于滑动 if (!canScrollVertically(-1) && !willRefresh) { canRefresh = true } resume = true } } MotionEvent.ACTION_UP -> { resume = false } } return resume; } override fun onTouchEvent(e: MotionEvent?): Boolean { when (e?.action) { MotionEvent.ACTION_DOWN -> { downY = e.y.toInt() constDownY = e.y.toInt() if (!canScrollVertically(-1) && !willRefresh) { canRefresh = true } } MotionEvent.ACTION_MOVE -> { if (isFirstMove) { isFirstMove = false if (canRefresh) { canRefresh = e.y - downY > 0 } } if (canRefresh) { if (getChildAt(0) is HomeBanner) { val firstView = getChildAt(0) as HomeBanner if (!hasShow) { showLoading(firstView) } var fl = e.y - constDownY//fl从1-pullDistance 缩放比例从0-1 if ((fl <= 0)) { return true } setLoadingScale(fl) val layoutParams = firstView.layoutParams if (layoutParams.height < 0 || tempWidth < 0) { originalFirstItemHeight = getChildViewHolder(firstView).itemView.height originalFirstItemWeight = getChildViewHolder(firstView).itemView.width layoutParams.height = originalFirstItemHeight tempWidth = originalFirstItemWeight firstView.layoutParams = layoutParams } else { var dY = e.y - downY val fl1 = e.y - constDownY val ratio = (1f / (0.004 * fl1 + 1)).toFloat()//实现阻尼效果 dY = dY * ratio layoutParams.height = (Math.max((layoutParams.height + dY).toInt(), originalFirstItemHeight)) tempWidth = (Math.max((tempWidth + dY * originalFirstItemWeight / originalFirstItemHeight).toInt(), originalFirstItemWeight)) downY = e.y.toInt() firstView.layoutParams = layoutParams val viewpager = firstView.getChildAt(0) as ViewPager val viewpagerLayoutParams = viewpager.layoutParams viewpagerLayoutParams.height = layoutParams.height viewpagerLayoutParams.width = tempWidth viewpager.layoutParams = viewpagerLayoutParams dx = viewpagerLayoutParams.width - originalFirstItemWeight adjustViewPager(viewpager, dx) } return true } } } MotionEvent.ACTION_UP -> { canRefresh = false isFirstMove = true constUpY = e.y if (getChildAt(0) is HomeBanner) { getChildAt(0)?.let { smoothRecover() } } } } return super.onTouchEvent(e) } val loadAnimation by lazy { val rotateAnimation = RotateAnimation(0f, 365f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f) rotateAnimation.duration = 500 rotateAnimation.repeatCount = -1 rotateAnimation.interpolator = LinearInterpolator() rotateAnimation } /** * 松手后恢复 */ private fun smoothRecover() { if (originalFirstItemHeight != 0) { homeBanner = getChildAt(0) as HomeBanner val layoutParams = homeBanner?.layoutParams homeBanner?.layoutParams = layoutParams val viewpager = homeBanner?.getChildAt(0) as ViewPager val viewpagerLayoutParams = viewpager.layoutParams if (loading.scaleX == 1f) { willRefresh = true } var dYForView = layoutParams!!.height - originalFirstItemHeight // layoutParams!!.height, originalFirstItemHeight val homeBannerAnimator = ValueAnimator.ofInt(layoutParams.height, originalFirstItemHeight) homeBannerAnimator .addUpdateListener { animation -> layoutParams.height = animation.animatedValue as Int tempWidth = (animation.animatedValue as Int * (originalFirstItemWeight * 1f / originalFirstItemHeight)).toInt() homeBanner?.layoutParams = layoutParams viewpagerLayoutParams.height = layoutParams.height dx = viewpagerLayoutParams.width - originalFirstItemWeight viewpagerLayoutParams.width = tempWidth viewpager.layoutParams = viewpagerLayoutParams LogUtil.d("${viewpagerLayoutParams.width}-->${viewpagerLayoutParams.height}-->"); dx = viewpagerLayoutParams.width - originalFirstItemWeight adjustViewPager(viewpager, dx) if (!willRefresh) { var distanceY: Float = (layoutParams.height - originalFirstItemHeight) * 1f//算出来的是从view增加的高度到0的值，需要把它映射到手指滑动的高度到0 var fl = distanceY * ((constUpY - constDownY) / dYForView)//映射 setLoadingScale(fl) } } homeBannerAnimator.addListener(object : Animator.AnimatorListener { override fun onAnimationRepeat(animation: Animator?) { } override fun onAnimationCancel(animation: Animator?) { } override fun onAnimationStart(animation: Animator?) { } override fun onAnimationEnd(animation: Animator?) { if (willRefresh) { onRefreshListner?.onRefresh() loading.startAnimation(loadAnimation) } else { hideLoading() } } }) homeBannerAnimator.setDuration(100) homeBannerAnimator.start() } } /** * 根据距离原始位置的高度，计算loasing的缩放值 */ private fun setLoadingScale(distanceY: Float) { var distance = (distanceY - 150) / pullDistance//下拉超过150之后开始逐渐出现loading if (distance >= 1) { distance = 1f } else if (distance < 0) { distance = 0f } loading.scaleX = distance loading.scaleY = distance } fun adjustViewPager(viewpager: ViewPager, dx: Int) { viewpager.translationX = -(dx * 1f / 2) } val loading by lazy { val imageView = ImageView(context) imageView.setImageResource(R.mipmap.eye_loading_progress) imageView } val loadingView by lazy { val frameLayout = RelativeLayout(context) frameLayout.setBackgroundColor(0xaa000000.toInt()) frameLayout.gravity = Gravity.CENTER frameLayout.addView(loading) frameLayout.layoutParams = ViewGroup.LayoutParams(width, ViewGroup.LayoutParams.MATCH_PARENT) frameLayout } var hasShow: Boolean = false fun showLoading(viewGroup: ViewGroup) { hasShow = true viewGroup.addView(loadingView) } fun hideLoading() { hasShow = false willRefresh = false loadAnimation.cancel() homeBanner?.let({ it.removeView(loadingView) }) } interface OnRefreshListener { fun onRefresh() } var onRefreshListner: OnRefreshListener? = null fun setOnRefreshListener(listener: OnRefreshListener) { this.onRefreshListner = listener } }