From 90fa50f5d1f89b544cc519c439ad3dca5bddb879 Mon Sep 17 00:00:00 2001
From: Alex Ning <chineseperson5@gmail.com>
Date: Wed, 15 Apr 2020 20:58:55 +0800
Subject: Add a fast scroller on SubscribedSubredditsListingFragment.

---
 .../SubscribedSubredditsRecyclerViewAdapter.java   | 48 +++++++++++++++++++++-
 .../SubscribedSubredditsListingFragment.java       |  2 +
 2 files changed, 49 insertions(+), 1 deletion(-)

(limited to 'app/src/main/java')

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/SubscribedSubredditsRecyclerViewAdapter.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/SubscribedSubredditsRecyclerViewAdapter.java
index 3f503fea..d5cb996a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/SubscribedSubredditsRecyclerViewAdapter.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/SubscribedSubredditsRecyclerViewAdapter.java
@@ -21,6 +21,7 @@ import java.util.List;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import me.zhanghai.android.fastscroll.PopupTextProvider;
 import ml.docilealligator.infinityforreddit.Activity.ViewSubredditDetailActivity;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.FavoriteThing;
@@ -30,7 +31,7 @@ import ml.docilealligator.infinityforreddit.SubscribedSubredditDatabase.Subscrib
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
-public class SubscribedSubredditsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+public class SubscribedSubredditsRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements PopupTextProvider {
     private static final int VIEW_TYPE_FAVORITE_SUBREDDIT_DIVIDER = 0;
     private static final int VIEW_TYPE_FAVORITE_SUBREDDIT = 1;
     private static final int VIEW_TYPE_SUBREDDIT_DIVIDER = 2;
@@ -409,6 +410,51 @@ public class SubscribedSubredditsRecyclerViewAdapter extends RecyclerView.Adapte
         this.userIconUrl = userIconUrl;
     }
 
+    @NonNull
+    @Override
+    public String getPopupText(int position) {
+        switch (getItemViewType(position)) {
+            case VIEW_TYPE_SUBREDDIT:
+                if (hasClearSelectionRow && position == 0) {
+                    return "";
+                } else if (itemClickListener != null && !hasClearSelectionRow && position == 0) {
+                    return "";
+                } else if (hasClearSelectionRow && position == 1) {
+                    return "";
+                } else {
+                    int offset;
+                    if (itemClickListener != null) {
+                        if (hasClearSelectionRow) {
+                            offset = (mFavoriteSubscribedSubredditData != null && mFavoriteSubscribedSubredditData.size() > 0) ?
+                                    mFavoriteSubscribedSubredditData.size() + 4 : 0;
+                        } else {
+                            offset = (mFavoriteSubscribedSubredditData != null && mFavoriteSubscribedSubredditData.size() > 0) ?
+                                    mFavoriteSubscribedSubredditData.size() + 3 : 0;
+                        }
+                    } else {
+                        offset = (mFavoriteSubscribedSubredditData != null && mFavoriteSubscribedSubredditData.size() > 0) ?
+                                mFavoriteSubscribedSubredditData.size() + 2 : 0;
+                    }
+
+                    return mSubscribedSubredditData.get(position - offset).getName().substring(0, 1).toUpperCase();
+                }
+            case VIEW_TYPE_FAVORITE_SUBREDDIT:
+                int offset;
+                if (itemClickListener != null) {
+                    if (hasClearSelectionRow) {
+                        offset = 3;
+                    } else {
+                        offset = 2;
+                    }
+                } else {
+                    offset = 1;
+                }
+                return mFavoriteSubscribedSubredditData.get(position - offset).getName().substring(0, 1).toUpperCase();
+            default:
+                return "";
+        }
+    }
+
     public interface ItemClickListener {
         void onClick(String name, String iconUrl, boolean subredditIsUser);
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubscribedSubredditsListingFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubscribedSubredditsListingFragment.java
index 09bd6e32..7ee62bdf 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubscribedSubredditsListingFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubscribedSubredditsListingFragment.java
@@ -29,6 +29,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import me.zhanghai.android.fastscroll.FastScrollerBuilder;
 import ml.docilealligator.infinityforreddit.Activity.BaseActivity;
 import ml.docilealligator.infinityforreddit.Activity.SubredditSelectionActivity;
 import ml.docilealligator.infinityforreddit.Activity.SubscribedThingListingActivity;
@@ -122,6 +123,7 @@ public class SubscribedSubredditsListingFragment extends Fragment implements Fra
         }
 
         mRecyclerView.setAdapter(adapter);
+        new FastScrollerBuilder(mRecyclerView).build();
 
         mSubscribedSubredditViewModel = new ViewModelProvider(this,
                 new SubscribedSubredditViewModel.Factory(mActivity.getApplication(), mRedditDataRoomDatabase, accountName))
-- 
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