From da4d5d711b6e47bddae76bedac28e2e5601db338 Mon Sep 17 00:00:00 2001
From: tom5079 <tom5079@naver.com>
Date: Thu, 15 Oct 2020 10:20:36 +0900
Subject: [PATCH] Prefetch Resolves #109

---
 .../java/xyz/quaver/pupil/adapters/ReaderAdapter.kt   |  1 -
 .../main/java/xyz/quaver/pupil/ui/ReaderActivity.kt   | 11 +++++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
index ce47fb60..595d3d43 100644
--- a/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
+++ b/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
@@ -19,7 +19,6 @@
 package xyz.quaver.pupil.adapters
 
 import android.content.Context
-import android.graphics.DiscretePathEffect
 import android.graphics.drawable.Animatable
 import android.net.Uri
 import android.view.LayoutInflater
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
index 48dbcced..0a4b3f8d 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
@@ -258,7 +258,7 @@ class ReaderActivity : BaseActivity() {
         //currentPage is 1-based
         return when(keyCode) {
             KeyEvent.KEYCODE_VOLUME_UP -> {
-                (reader_recyclerview.layoutManager as LinearLayoutManager?)?.scrollToPositionWithOffset(currentPage-2, 0)
+                (reader_recyclerview.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(currentPage-2, 0)
 
                 true
             }
@@ -339,7 +339,7 @@ class ReaderActivity : BaseActivity() {
                         scrollMode(false)
                         fullscreen(true)
                     } else {
-                        (reader_recyclerview.layoutManager as LinearLayoutManager?)?.scrollToPosition(currentPage) //Moves to next page because currentPage is 1-based indexing
+                        (reader_recyclerview.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(currentPage, 0) //Moves to next page because currentPage is 1-based indexing
                     }
                 }
             }
@@ -359,7 +359,6 @@ class ReaderActivity : BaseActivity() {
                         return
                     currentPage = layoutManager.findFirstVisibleItemPosition()+1
                     menu?.findItem(R.id.reader_menu_page_indicator)?.title = "$currentPage/${recyclerView.adapter!!.itemCount}"
-
                 }
             })
         }
@@ -455,7 +454,11 @@ class ReaderActivity : BaseActivity() {
             reader_recyclerview.layoutManager = LinearLayoutManager(this)
         } else {
             snapHelper.attachToRecyclerView(reader_recyclerview)
-            reader_recyclerview.layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, Preferences["rtl", false])
+            reader_recyclerview.layoutManager = object: LinearLayoutManager(this, HORIZONTAL, Preferences["rtl", false]) {
+                override fun calculateExtraLayoutSpace(state: RecyclerView.State, extraLayoutSpace: IntArray) {
+                    extraLayoutSpace.fill(600)
+                }
+            }
         }
 
         (reader_recyclerview.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(currentPage-1, 0)