From 13107b919333092c4e1b48c6c0da50be3d31acc2 Mon Sep 17 00:00:00 2001
From: Alex Ning <chineseperson5@gmail.com>
Date: Tue, 8 Dec 2020 18:40:19 +0800
Subject: Fix lazy mode after hiding read posts.

---
 .../adapters/PostRecyclerViewAdapter.java                | 16 ++++++++++++++++
 .../infinityforreddit/fragments/PostFragment.java        |  8 ++++----
 .../ml/docilealligator/infinityforreddit/post/Post.java  | 11 +++++++++++
 3 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostRecyclerViewAdapter.java b/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostRecyclerViewAdapter.java
index 9d9e890d..8a8eef99 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostRecyclerViewAdapter.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/PostRecyclerViewAdapter.java
@@ -396,6 +396,7 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
             if (post != null) {
                 if (post.isRead()) {
                     if (position < mHideReadPostsIndex) {
+                        post.hidePostInRecyclerView();
                         holder.itemView.setVisibility(View.GONE);
                         RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) holder.itemView.getLayoutParams();
                         params.height = 0;
@@ -717,6 +718,7 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
             if (post != null) {
                 if (post.isRead()) {
                     if (position < mHideReadPostsIndex) {
+                        post.hidePostInRecyclerView();
                         holder.itemView.setVisibility(View.GONE);
                         ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();
                         params.height = 0;
@@ -1218,6 +1220,20 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
         mHideReadPostsIndex = getItemCount();
     }
 
+    public int getNextItemPositionWithoutBeingHidden(int fromPosition) {
+        int temp = fromPosition;
+        while (temp >= 0 && temp < super.getItemCount()) {
+            Post post = getItem(temp);
+            if (post != null && post.isHiddenInRecyclerView()) {
+                temp++;
+            } else {
+                break;
+            }
+        }
+
+        return temp;
+    }
+
     private boolean hasExtraRow() {
         return networkState != null && networkState.getStatus() != NetworkState.Status.SUCCESS;
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
index c682e181..948bd0d9 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
@@ -331,20 +331,20 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
             @Override
             public void run() {
-                if (isInLazyMode && !isLazyModePaused) {
+                if (isInLazyMode && !isLazyModePaused && mAdapter != null) {
                     int nPosts = mAdapter.getItemCount();
                     if (getCurrentPosition() == -1) {
                         if (mLinearLayoutManager != null) {
-                            setCurrentPosition(mLinearLayoutManager.findFirstVisibleItemPosition());
+                            setCurrentPosition(mAdapter.getNextItemPositionWithoutBeingHidden(mLinearLayoutManager.findFirstVisibleItemPosition()));
                         } else {
                             int[] into = new int[2];
-                            setCurrentPosition(mStaggeredGridLayoutManager.findFirstVisibleItemPositions(into)[1]);
+                            setCurrentPosition(mAdapter.getNextItemPositionWithoutBeingHidden(mStaggeredGridLayoutManager.findFirstVisibleItemPositions(into)[1]));
                         }
                     }
 
                     if (getCurrentPosition() != RecyclerView.NO_POSITION && nPosts > getCurrentPosition()) {
                         incrementCurrentPosition();
-                        smoothScroller.setTargetPosition(getCurrentPosition());
+                        smoothScroller.setTargetPosition(mAdapter.getNextItemPositionWithoutBeingHidden(getCurrentPosition()));
                         if (mLinearLayoutManager != null) {
                             mLinearLayoutManager.startSmoothScroll(smoothScroller);
                         } else {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/post/Post.java b/app/src/main/java/ml/docilealligator/infinityforreddit/post/Post.java
index 582c398d..c96c325a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/post/Post.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/post/Post.java
@@ -72,6 +72,7 @@ public class Post implements Parcelable {
     private boolean saved;
     private boolean isCrosspost;
     private boolean isRead;
+    private boolean isHiddenInRecyclerView = false;
     private String crosspostParentId;
     private ArrayList<Preview> previews = new ArrayList<>();
     private ArrayList<Gallery> gallery = new ArrayList<>();
@@ -187,6 +188,7 @@ public class Post implements Parcelable {
         saved = in.readByte() != 0;
         isCrosspost = in.readByte() != 0;
         isRead = in.readByte() != 0;
+        isHiddenInRecyclerView = in.readByte() != 0;
         crosspostParentId = in.readString();
         in.readTypedList(previews, Preview.CREATOR);
         in.readTypedList(gallery, Gallery.CREATOR);
@@ -458,6 +460,14 @@ public class Post implements Parcelable {
         return isRead;
     }
 
+    public boolean isHiddenInRecyclerView() {
+        return isHiddenInRecyclerView;
+    }
+
+    public void hidePostInRecyclerView() {
+        isHiddenInRecyclerView = true;
+    }
+
     public String getCrosspostParentId() {
         return crosspostParentId;
     }
@@ -523,6 +533,7 @@ public class Post implements Parcelable {
         parcel.writeByte((byte) (saved ? 1 : 0));
         parcel.writeByte((byte) (isCrosspost ? 1 : 0));
         parcel.writeByte((byte) (isRead ? 1 : 0));
+        parcel.writeByte((byte) (isHiddenInRecyclerView ? 1 : 0));
         parcel.writeString(crosspostParentId);
         parcel.writeTypedList(previews);
         parcel.writeTypedList(gallery);
-- 
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