From 17f425a186513b09d3e451018e230df35e2360d2 Mon Sep 17 00:00:00 2001
From: yangyakun <yangyakun@zhidaoauto.com>
Date: Mon, 24 Apr 2023 12:55:05 +0800
Subject: [PATCH] =?UTF-8?q?[bugfix]=20[recycleview=20=E5=B1=85=E4=B8=AD?=
 =?UTF-8?q?=E9=97=AE=E9=A2=98]?=
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---
 .../och/bus/passenger/ui/M1SoftFragment.kt    |  5 +-
 .../ui/layoutmanage/PagerCenterSnapHelper.kt  | 81 +++++++++++++++++++
 2 files changed, 84 insertions(+), 2 deletions(-)
 create mode 100644 OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/layoutmanage/PagerCenterSnapHelper.kt

diff --git a/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/M1SoftFragment.kt b/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/M1SoftFragment.kt
index 34aff80614..60e3875e57 100644
--- a/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/M1SoftFragment.kt
+++ b/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/M1SoftFragment.kt
@@ -30,6 +30,7 @@ import com.mogo.och.bus.passenger.R
 import com.mogo.och.bus.passenger.bean.Temperature
 import com.mogo.och.bus.passenger.presenter.BusPassengerFunctionSoftPresenter
 import com.mogo.och.bus.passenger.ui.adapter.TemperatureAdapter
+import com.mogo.och.bus.passenger.ui.layoutmanage.PagerCenterSnapHelper
 import com.mogo.och.bus.passenger.view.HorizontalDecoration
 import com.mogo.och.bus.passenger.view.PickerLayoutManager
 import com.mogo.och.common.module.utils.SoundPoolHelper
@@ -235,12 +236,12 @@ class M1SoftFragment :
 
         val data = getData()
         val adapter = TemperatureAdapter(requireContext(), data, rv_aircondition_temperature)
-        val snapHelper: SnapHelper = LinearSnapHelper()
+        val snapHelper = PagerCenterSnapHelper()
         snapHelper.attachToRecyclerView(rv_aircondition_temperature)
         rv_aircondition_temperature.layoutManager = pickerLayoutManager
         rv_aircondition_temperature.adapter = adapter
         HorizontalDecoration.distance = SharedPrefsMgr.getInstance(requireContext()).getInt(HorizontalDecoration.distancekey,0)
-        val space = AutoSizeUtils.dp2px(context, 22f)
+        val space = AutoSizeUtils.dp2px(context, 15f)
         rv_aircondition_temperature.addItemDecoration(HorizontalDecoration(space,data.size-1))
 
         pickerLayoutManager.setOnScrollStopListener { view ->
diff --git a/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/layoutmanage/PagerCenterSnapHelper.kt b/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/layoutmanage/PagerCenterSnapHelper.kt
new file mode 100644
index 0000000000..f0a3f564db
--- /dev/null
+++ b/OCH/mogo-och-charter-passenger/src/m1/java/com/mogo/och/bus/passenger/ui/layoutmanage/PagerCenterSnapHelper.kt
@@ -0,0 +1,81 @@
+package com.mogo.och.bus.passenger.ui.layoutmanage
+
+import android.view.View
+import androidx.recyclerview.widget.OrientationHelper
+import androidx.recyclerview.widget.PagerSnapHelper
+import androidx.recyclerview.widget.RecyclerView
+
+class PagerCenterSnapHelper : PagerSnapHelper() {
+    private var mHorizontalHelper: OrientationHelper? = null
+    private var pageScollListener: PageScollListener? = null
+    override fun findSnapView(layoutManager: RecyclerView.LayoutManager): View? {
+        if (layoutManager.canScrollVertically()) {
+            return super.findSnapView(layoutManager)
+        } else if (layoutManager.canScrollHorizontally()) {
+            return findCenterView(layoutManager, getHorizontalHelper(layoutManager))
+        }
+        return null
+    }
+
+    private fun findCenterView(
+        layoutManager: RecyclerView.LayoutManager,
+        helper: OrientationHelper
+    ): View? {
+        val childCount = layoutManager.childCount
+        if (childCount == 0) {
+            return null
+        }
+        var closestChild: View? = null
+        val center = helper.startAfterPadding + helper.totalSpace / 2
+        var absClosest = Int.MAX_VALUE
+        for (i in 0 until childCount) {
+            val child = layoutManager.getChildAt(i)
+            val params = child!!.layoutParams as RecyclerView.LayoutParams
+            var childCenter = 0
+            childCenter = if (i == 0) {
+                helper.getDecoratedStart(child) + helper.getDecoratedMeasurement(child) - layoutManager.getDecoratedMeasuredWidth(
+                    child
+                ) / 2 - params.rightMargin / 2
+            } else if (i == childCount - 1) {
+                (helper.getDecoratedStart(child)
+                        + (helper.getDecoratedMeasurement(child) - layoutManager.getDecoratedMeasuredWidth(
+                    child
+                ) / 2 - params.leftMargin / 2 - params.rightMargin))
+            } else {
+                helper.getDecoratedStart(child) + helper.getDecoratedMeasurement(child) / 2
+            }
+            val absDistance = Math.abs(childCenter - center)
+            /* if child center is closer than previous closest, set it as closest  */if (absDistance < absClosest) {
+                absClosest = absDistance
+                closestChild = child
+            }
+        }
+        if (pageScollListener != null) {
+            if (closestChild != null) {
+                pageScollListener!!.onPageSelected(layoutManager.getPosition(closestChild))
+            }
+        }
+        return closestChild
+    }
+
+    private fun getHorizontalHelper(
+        layoutManager: RecyclerView.LayoutManager
+    ): OrientationHelper {
+        if (mHorizontalHelper == null || mHorizontalHelper!!.layoutManager !== layoutManager) {
+            mHorizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager)
+        }
+        return mHorizontalHelper!!
+    }
+
+    fun setPageScollListener(pageScollListener: PageScollListener?) {
+        this.pageScollListener = pageScollListener
+    }
+
+    interface PageScollListener {
+        fun onPageSelected(i: Int)
+    }
+
+    companion object {
+        private const val TAG = "PagerSnapHelper "
+    }
+}
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