Added horizontal view for ReaderActivity

Added page selector for ReaderActivity

app/src/main/java/xyz/quaver/pupil/util/ItemClickSupport.java

@@ -0,0 +1,107 @@
+package xyz.quaver.pupil.util;
+
+import android.view.View;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+import xyz.quaver.pupil.R;
+
+/*
+  Source: http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/
+  USAGE:
+
+  ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
+      @Override
+      public void onItemClicked(RecyclerView recyclerView, int position, View v) {
+          // do it
+      }
+  });
+
+*/
+public class ItemClickSupport {
+    private final RecyclerView mRecyclerView;
+    private OnItemClickListener mOnItemClickListener;
+    private OnItemLongClickListener mOnItemLongClickListener;
+    private View.OnClickListener mOnClickListener = new View.OnClickListener() {
+        @Override
+        public void onClick(View v) {
+            if (mOnItemClickListener != null) {
+                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
+                mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
+            }
+        }
+    };
+    private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
+        @Override
+        public boolean onLongClick(View v) {
+            if (mOnItemLongClickListener != null) {
+                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
+                return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
+            }
+            return false;
+        }
+    };
+    private RecyclerView.OnChildAttachStateChangeListener mAttachListener
+            = new RecyclerView.OnChildAttachStateChangeListener() {
+        @Override
+        public void onChildViewAttachedToWindow(@NonNull View view) {
+            if (mOnItemClickListener != null) {
+                view.setOnClickListener(mOnClickListener);
+            }
+            if (mOnItemLongClickListener != null) {
+                view.setOnLongClickListener(mOnLongClickListener);
+            }
+        }
+
+        @Override
+        public void onChildViewDetachedFromWindow(@NonNull View view) {
+
+        }
+    };
+
+    private ItemClickSupport(RecyclerView recyclerView) {
+        mRecyclerView = recyclerView;
+        mRecyclerView.setTag(R.id.item_click_support, this);
+        mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
+    }
+
+    public static ItemClickSupport addTo(RecyclerView view) {
+        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
+        if (support == null) {
+            support = new ItemClickSupport(view);
+        }
+        return support;
+    }
+
+    public static ItemClickSupport removeFrom(RecyclerView view) {
+        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
+        if (support != null) {
+            support.detach(view);
+        }
+        return support;
+    }
+
+    public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
+        mOnItemClickListener = listener;
+        return this;
+    }
+
+    public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
+        mOnItemLongClickListener = listener;
+        return this;
+    }
+
+    private void detach(RecyclerView view) {
+        view.removeOnChildAttachStateChangeListener(mAttachListener);
+        view.setTag(R.id.item_click_support, null);
+    }
+
+    public interface OnItemClickListener {
+
+        void onItemClicked(RecyclerView recyclerView, int position, View v);
+    }
+
+    public interface OnItemLongClickListener {
+
+        boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
+    }
+}