Move all contextual card related classes.

... from homepage to contextualcards.

Test: rebuild
Change-Id: Id7889566ce1e7257eb699d963ae996906fdb58ff

src/com/android/settings/homepage/contextualcards/ContextualCardsAdapter.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.homepage.contextualcards;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.lifecycle.LifecycleOwner;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class ContextualCardsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
+        implements ContextualCardUpdateListener {
+    static final int SPAN_COUNT = 2;
+
+    private static final String TAG = "ContextualCardsAdapter";
+    private static final int HALF_WIDTH = 1;
+    private static final int FULL_WIDTH = 2;
+
+    private final Context mContext;
+    private final ControllerRendererPool mControllerRendererPool;
+    private final List<ContextualCard> mContextualCards;
+    private final LifecycleOwner mLifecycleOwner;
+
+    public ContextualCardsAdapter(Context context, LifecycleOwner lifecycleOwner,
+            ContextualCardManager manager) {
+        mContext = context;
+        mContextualCards = new ArrayList<>();
+        mControllerRendererPool = manager.getControllerRendererPool();
+        mLifecycleOwner = lifecycleOwner;
+        setHasStableIds(true);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return mContextualCards.get(position).hashCode();
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return mContextualCards.get(position).getCardType();
+    }
+
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int cardType) {
+        final ContextualCardRenderer renderer = mControllerRendererPool.getRenderer(mContext,
+                mLifecycleOwner, cardType);
+        final int viewType = renderer.getViewType();
+        final View view = LayoutInflater.from(parent.getContext()).inflate(viewType, parent, false);
+
+        return renderer.createViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
+        final int cardType = mContextualCards.get(position).getCardType();
+        final ContextualCardRenderer renderer = mControllerRendererPool.getRenderer(mContext,
+                mLifecycleOwner, cardType);
+
+        renderer.bindView(holder, mContextualCards.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        return mContextualCards.size();
+    }
+
+    @Override
+    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
+        super.onAttachedToRecyclerView(recyclerView);
+        final RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
+        if (layoutManager instanceof GridLayoutManager) {
+            final GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
+            gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
+                @Override
+                public int getSpanSize(int position) {
+                    final ContextualCard card = mContextualCards.get(position);
+                    //TODO(b/114009676): may use another field to make decision. still under review.
+                    if (card.isHalfWidth()) {
+                        return HALF_WIDTH;
+                    }
+                    return FULL_WIDTH;
+                }
+            });
+        }
+    }
+
+    @Override
+    public void onContextualCardUpdated(Map<Integer, List<ContextualCard>> cards) {
+        final List<ContextualCard> contextualCards = cards.get(ContextualCard.CardType.DEFAULT);
+        if (contextualCards == null) {
+            mContextualCards.clear();
+            notifyDataSetChanged();
+        } else {
+            final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(
+                    new ContextualCardsDiffCallback(mContextualCards, contextualCards));
+            mContextualCards.clear();
+            mContextualCards.addAll(contextualCards);
+            diffResult.dispatchUpdatesTo(this);
+        }
+    }
+}