From 98b324f1902888f7382d4ed8d42eed4832ed4d5f Mon Sep 17 00:00:00 2001
From: Alex Ning <chineseperson5@gmail.com>
Date: Thu, 3 Sep 2020 09:34:32 +0800
Subject: Implement barebone swipe to upvote or downvote.

---
 .../Adapter/PostRecyclerViewAdapter.java           | 21 ++++++
 .../infinityforreddit/Fragment/PostFragment.java   | 77 ++++++++++++++++++++++
 2 files changed, 98 insertions(+)

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/PostRecyclerViewAdapter.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/PostRecyclerViewAdapter.java
index c9cf8e96..13fa5d90 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/PostRecyclerViewAdapter.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/PostRecyclerViewAdapter.java
@@ -10,6 +10,7 @@ import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -30,6 +31,7 @@ import androidx.constraintlayout.widget.ConstraintSet;
 import androidx.core.graphics.drawable.DrawableCompat;
 import androidx.paging.PagedListAdapter;
 import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.bumptech.glide.Glide;
@@ -509,10 +511,12 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
                 switch (post.getVoteType()) {
                     case 1:
                         //Upvoted
+                        Log.i("asdasdf", "upvoted");
                         ((PostBaseViewHolder) holder).upvoteButton.setColorFilter(mUpvotedColor, android.graphics.PorterDuff.Mode.SRC_IN);
                         ((PostBaseViewHolder) holder).scoreTextView.setTextColor(mUpvotedColor);
                         break;
                     case -1:
+                        Log.i("asdasdf", "downvoted");
                         //Downvoted
                         ((PostBaseViewHolder) holder).downvoteButton.setColorFilter(mDownvotedColor, android.graphics.PorterDuff.Mode.SRC_IN);
                         ((PostBaseViewHolder) holder).scoreTextView.setTextColor(mDownvotedColor);
@@ -1240,6 +1244,19 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
         return null;
     }
 
+    public void onItemSwipe(RecyclerView.ViewHolder viewHolder, int direction) {
+        if (viewHolder instanceof PostBaseViewHolder) {
+            Post post = getItem(viewHolder.getAdapterPosition());
+            if (post != null) {
+                if (direction == ItemTouchHelper.LEFT || direction == ItemTouchHelper.START) {
+                    ((PostBaseViewHolder) viewHolder).upvoteButton.performClick();
+                } else {
+                    ((PostBaseViewHolder) viewHolder).downvoteButton.performClick();
+                }
+            }
+        }
+    }
+
     public interface Callback {
         void retryLoadingMore();
 
@@ -1510,12 +1527,14 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
 
                     if (previousVoteType != 1) {
                         //Not upvoted before
+                        Log.i("asdasdf", "not 1 before");
                         post.setVoteType(1);
                         newVoteType = APIUtils.DIR_UPVOTE;
                         upvoteButton
                                 .setColorFilter(mUpvotedColor, android.graphics.PorterDuff.Mode.SRC_IN);
                         scoreTextView.setTextColor(mUpvotedColor);
                     } else {
+                        Log.i("asdasdf", "1 before");
                         //Upvoted before
                         post.setVoteType(0);
                         newVoteType = APIUtils.DIR_UNVOTE;
@@ -1529,11 +1548,13 @@ public class PostRecyclerViewAdapter extends PagedListAdapter<Post, RecyclerView
                         @Override
                         public void onVoteThingSuccess(int position1) {
                             if (newVoteType.equals(APIUtils.DIR_UPVOTE)) {
+                                Log.i("asdasdf", "1");
                                 post.setVoteType(1);
                                 upvoteButton
                                         .setColorFilter(mUpvotedColor, android.graphics.PorterDuff.Mode.SRC_IN);
                                 scoreTextView.setTextColor(mUpvotedColor);
                             } else {
+                                Log.i("asdasdf", "0");
                                 post.setVoteType(0);
                                 upvoteButton.setColorFilter(mPostIconAndInfoColor, android.graphics.PorterDuff.Mode.SRC_IN);
                                 scoreTextView.setTextColor(mPostIconAndInfoColor);
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
index a2097c3b..fe33e43a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/PostFragment.java
@@ -6,7 +6,10 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.content.res.Resources;
+import android.graphics.Canvas;
 import android.graphics.Rect;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.CountDownTimer;
@@ -27,9 +30,11 @@ import androidx.annotation.DimenRes;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.content.res.ResourcesCompat;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.paging.PagedList;
+import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.LinearSmoothScroller;
 import androidx.recyclerview.widget.RecyclerView;
@@ -172,6 +177,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     private int maxPosition = -1;
     private int postLayout;
     private SortType sortType;
+    private ColorDrawable backgroundLeft;
+    private ColorDrawable backgroundRight;
+    private Drawable drawableLeft;
+    private Drawable drawableRight;
+    private float swipeActionThreshold = 0.3f;
+    private ItemTouchHelper touchHelper;
 
     public PostFragment() {
         // Required empty public constructor
@@ -610,6 +621,72 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
             ((ActivityToolbarInterface) activity).displaySortType();
         }
 
+        backgroundLeft = new ColorDrawable(customThemeWrapper.getDownvoted());
+        backgroundRight = new ColorDrawable(customThemeWrapper.getUpvoted());
+        drawableLeft = ResourcesCompat.getDrawable(activity.getResources(), R.drawable.ic_arrow_downward_black_24dp, null);
+        drawableRight = ResourcesCompat.getDrawable(activity.getResources(), R.drawable.ic_arrow_upward_black_24dp, null);
+        touchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
+            @Override
+            public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
+                int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
+                return makeMovementFlags(0, swipeFlags);
+            }
+
+            @Override
+            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
+                return false;
+            }
+
+            @Override
+            public boolean isItemViewSwipeEnabled() {
+                return true;
+            }
+
+            @Override
+            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
+                if (touchHelper != null) {
+                    touchHelper.attachToRecyclerView(null);
+                    touchHelper.attachToRecyclerView(mPostRecyclerView);
+                    if (mAdapter != null) {
+                        mAdapter.onItemSwipe(viewHolder, direction);
+                    }
+                }
+            }
+
+            @Override
+            public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
+                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
+
+                View itemView = viewHolder.itemView;
+                int horizontalOffset = (int) Utils.convertDpToPixel(16, activity);
+                if (dX > 0) {
+                    if (dX > (itemView.getRight() - itemView.getLeft()) * 0.3) {
+                        backgroundLeft.setBounds(0, itemView.getTop(), itemView.getRight(), itemView.getBottom());
+                    } else {
+                        backgroundLeft.setBounds(0, 0, 0, 0);
+                    }
+                    drawableLeft.setBounds(itemView.getLeft() + ((int) dX) - horizontalOffset - drawableLeft.getIntrinsicWidth(), (itemView.getBottom() - itemView.getTop() - drawableLeft.getIntrinsicHeight()) / 2, itemView.getLeft() + ((int) dX) - horizontalOffset, (itemView.getBottom() - itemView.getTop() + drawableLeft.getIntrinsicHeight()) / 2);
+                    backgroundLeft.draw(c);
+                    drawableLeft.draw(c);
+                } else if (dX < 0) {
+                    if (-dX > (itemView.getRight() - itemView.getLeft()) * 0.3) {
+                        backgroundRight.setBounds(0, itemView.getTop(), itemView.getRight(), itemView.getBottom());
+                    } else {
+                        backgroundRight.setBounds(0, 0, 0, 0);
+                    }
+                    drawableRight.setBounds(itemView.getRight() + ((int) dX) + horizontalOffset, (itemView.getBottom() - itemView.getTop() - drawableRight.getIntrinsicHeight()) / 2, itemView.getRight() + ((int) dX) + horizontalOffset + drawableRight.getIntrinsicWidth(), (itemView.getBottom() - itemView.getTop() + drawableRight.getIntrinsicHeight()) / 2);
+                    backgroundRight.draw(c);
+                    drawableRight.draw(c);
+                }
+            }
+
+            @Override
+            public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
+                return swipeActionThreshold;
+            }
+        });
+
+        touchHelper.attachToRecyclerView(mPostRecyclerView);
         mPostRecyclerView.setAdapter(mAdapter);
         mPostRecyclerView.setCacheManager(mAdapter);
         mPostRecyclerView.setPlayerInitializer(order -> {
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