From 8ed1b488be9af5b6dad4159c0f19908b689fe455 Mon Sep 17 00:00:00 2001
From: LagradOst <balt.758@gmail.com>
Date: Fri, 22 Oct 2021 20:11:26 +0200
Subject: [PATCH] center

---
 .../cloudstream3/ui/home/HomeFragment.kt      | 15 ++++++-
 .../widget/CenterZoomLayoutManager.kt         | 41 +++++++++++++++----
 app/src/main/res/layout/fragment_home.xml     |  4 ++
 3 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/app/src/main/java/com/lagradost/cloudstream3/ui/home/HomeFragment.kt b/app/src/main/java/com/lagradost/cloudstream3/ui/home/HomeFragment.kt
index 6435bbdf..8a956b66 100644
--- a/app/src/main/java/com/lagradost/cloudstream3/ui/home/HomeFragment.kt
+++ b/app/src/main/java/com/lagradost/cloudstream3/ui/home/HomeFragment.kt
@@ -123,12 +123,25 @@ class HomeFragment : Fragment() {
             if (randomItems.isNullOrEmpty()) {
                 toggleMainVisibility(false)
             } else {
+                val randomSize = randomItems.size
                 home_main_poster_recyclerview.adapter =
                     HomeChildItemAdapter(randomItems, R.layout.home_result_big_grid) { callback ->
                         handleSearchClickCallback(activity, callback)
                     }
                 home_main_poster_recyclerview.post {
-                    (home_main_poster_recyclerview.layoutManager as CenterZoomLayoutManager?)?.updateSize(forceUpdate = true)
+                    (home_main_poster_recyclerview.layoutManager as CenterZoomLayoutManager?)?.let { manager ->
+
+                        manager.updateSize(forceUpdate = true)
+                        if (randomSize > 2) {
+                            manager.scrollToPosition(randomSize / 2)
+                            manager.snap { dx ->
+                                home_main_poster_recyclerview?.post {
+                                    // this is the best I can do, fuck android for not including instant scroll
+                                    home_main_poster_recyclerview?.smoothScrollBy(dx,0)
+                                }
+                            }
+                        }
+                    }
                 }
 
                 toggleMainVisibility(true)
diff --git a/app/src/main/java/com/lagradost/cloudstream3/widget/CenterZoomLayoutManager.kt b/app/src/main/java/com/lagradost/cloudstream3/widget/CenterZoomLayoutManager.kt
index 23e98a9f..e6b833ea 100644
--- a/app/src/main/java/com/lagradost/cloudstream3/widget/CenterZoomLayoutManager.kt
+++ b/app/src/main/java/com/lagradost/cloudstream3/widget/CenterZoomLayoutManager.kt
@@ -3,7 +3,9 @@ package com.lagradost.cloudstream3.widget
 import android.content.Context
 import android.util.AttributeSet
 import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.LinearSnapHelper
 import androidx.recyclerview.widget.RecyclerView
+import com.lagradost.cloudstream3.mvvm.logError
 import kotlin.math.abs
 import kotlin.math.min
 
@@ -38,17 +40,21 @@ class CenterZoomLayoutManager : LinearLayoutManager {
         var largestSize = 0f
         for (i in 0 until childCount) {
             getChildAt(i)?.let { child ->
-                val childMidpoint = (getDecoratedRight(child) + getDecoratedLeft(child)) / 2f
-                val d = min(d1, abs(midpoint - childMidpoint))
-                val scale = s0 + (s1 - s0) * (d - d0) / (d1 - d0)
-                child.scaleX = scale
-                child.scaleY = scale
+                try {
+                    val childMidpoint = (getDecoratedRight(child) + getDecoratedLeft(child)) / 2f
+                    val d = min(d1, abs(midpoint - childMidpoint))
+                    val scale = s0 + (s1 - s0) * (d - d0) / (d1 - d0)
+                    child.scaleX = scale
+                    child.scaleY = scale
 
-                if (scale > largestSize) {
-                    (child.tag as Int?)?.let { tag ->
-                        largestSize = scale
-                        largestTag = tag
+                    if (scale > largestSize) {
+                        (child.tag as Int?)?.let { tag ->
+                            largestSize = scale
+                            largestTag = tag
+                        }
                     }
+                } catch (e : Exception) {
+                    logError(e)
                 }
             }
         }
@@ -72,9 +78,26 @@ class CenterZoomLayoutManager : LinearLayoutManager {
 
     override fun onLayoutCompleted(state: RecyclerView.State?) {
         super.onLayoutCompleted(state)
+        if(waitForSnap != null) {
+            this.getChildAt(snapChild ?: 1)?.let { view ->
+                LinearSnapHelper().calculateDistanceToFinalSnap(this,view)?.get(0)?.let { dx ->
+                    println("DX: $dx")
+                    waitForSnap?.invoke(dx)
+                    waitForSnap = null
+                }
+            }
+        }
         updateSize()
     }
 
+    private var waitForSnap : ((Int) -> Unit)? = null
+    private var snapChild : Int? = null
+
+    fun snap(snap : Int? = null, callback : (Int) -> Unit) {
+        waitForSnap = callback
+        snapChild = snap
+    }
+
     override fun scrollHorizontallyBy(dx: Int, recycler: RecyclerView.Recycler, state: RecyclerView.State): Int {
         val orientation = orientation
         return if (orientation == HORIZONTAL) {
diff --git a/app/src/main/res/layout/fragment_home.xml b/app/src/main/res/layout/fragment_home.xml
index 2356ba66..a03f221b 100644
--- a/app/src/main/res/layout/fragment_home.xml
+++ b/app/src/main/res/layout/fragment_home.xml
@@ -165,6 +165,10 @@
                         android:nextFocusUp="@id/home_change_api"
                         android:nextFocusDown="@id/home_main_info"
 
+                        android:clipToPadding="false"
+                        android:paddingStart="148dp"
+                        android:paddingEnd="148dp"
+
                         app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
                         android:id="@+id/home_main_poster_recyclerview"
                         android:orientation="horizontal"