From a80419e4bd7458dccac47862c2ae5e403f33a646 Mon Sep 17 00:00:00 2001
From: juntao <chenjuntao@ghzhushou.com>
Date: Mon, 28 Sep 2020 12:53:00 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E6=A8=AA=E5=90=91=E5=A4=A7?=
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---
 .../imageslide/GameImageSlideViewHolder.kt    | 31 ++++++++++++++-----
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/app/src/main/java/com/gh/gamecenter/game/imageslide/GameImageSlideViewHolder.kt b/app/src/main/java/com/gh/gamecenter/game/imageslide/GameImageSlideViewHolder.kt
index d5407a1e5c..962848dc82 100644
--- a/app/src/main/java/com/gh/gamecenter/game/imageslide/GameImageSlideViewHolder.kt
+++ b/app/src/main/java/com/gh/gamecenter/game/imageslide/GameImageSlideViewHolder.kt
@@ -18,6 +18,7 @@ import com.gh.gamecenter.entity.GameEntity
 class GameImageSlideViewHolder(val binding: GameImageSlideItemBinding) : BaseRecyclerViewHolder<Any>(binding.root) {
 
     private var mScrollListener: RecyclerView.OnScrollListener? = null
+    private var mLastScrolledPosition = 0
 
     fun bindImageSlide(entity: GameEntity,
                        imageClickListener: View.OnClickListener,
@@ -50,11 +51,13 @@ class GameImageSlideViewHolder(val binding: GameImageSlideItemBinding) : BaseRec
                 slideAdapter.notifyItemRangeChanged(0, slideAdapter.itemCount)
 
                 // 处理复用时的 recyclerView 偏移问题
-                val offset = offsetable.getOffset(adapterPosition)
-                if (offset == 0) {
-                    binding.columnList.scrollToPosition(0)
-                } else {
-                    binding.columnList.scrollBy(offset, offset)
+                if (mLastScrolledPosition != adapterPosition) {
+                    val offset = offsetable.getOffset(adapterPosition)
+                    if (offset == 0) {
+                        binding.columnList.scrollToPosition(0)
+                    } else {
+                        binding.columnList.scrollBy(offset, offset)
+                    }
                 }
             }
         } else {
@@ -68,6 +71,7 @@ class GameImageSlideViewHolder(val binding: GameImageSlideItemBinding) : BaseRec
                     super.onScrollStateChanged(recyclerView, newState)
 
                     if (newState == RecyclerView.SCROLL_STATE_IDLE) {
+                        mLastScrolledPosition = adapterPosition
                         offsetable.updateOffset(adapterPosition, recyclerView.computeHorizontalScrollOffset())
                     }
                 }
@@ -90,13 +94,24 @@ class GameImageSlideViewHolder(val binding: GameImageSlideItemBinding) : BaseRec
             firstVisiblePosition = layoutManager.findFirstVisibleItemPosition()
         }
 
-        val index = if (offset > 180 || firstVisiblePosition > 0) 180 else if (offset < 0) 30 else offset + 30
+        val relativeOffset = if (offset > 180 || firstVisiblePosition > 0) {
+            180
+        } else if (offset < 0) {
+            30
+        } else {
+            if (offset + 30 > 180) {
+                180
+            } else {
+                offset + 30
+            }
+        }
+
         if (columnIconLp is ConstraintLayout.LayoutParams) {
-            columnIconLp.leftMargin = -(index / 4).toFloat().dip2px()
+            columnIconLp.leftMargin = -(relativeOffset / 4).toFloat().dip2px()
             binding.columnIcon.layoutParams = columnIconLp
         }
 
-        val startAlpha = index.toFloat() / 180 * 90
+        val startAlpha = relativeOffset.toFloat() / 180 * 90
         val startColor = "#" + DrawableView.convertAlphaKey(startAlpha.toInt()) + "0C1926"
         val endColor = "#" + DrawableView.convertAlphaKey(100) + "0C1926"
         binding.columnBackground.background = DrawableView.getGradientDrawable(