Swipe to dismiss suggestions

- Move dismiss suggestion logic into feature provider
- In DashboardData, use hashcode as suggestion's stable id. This is much
  more likely to provide a truely stable id for each suggestion card.
  Eventually I want to use hash for all tiles to provide stable id.
- Add a SuggestionDismissionController to handle swipe to dismiss
  callbacks

Change-Id: If3770f07a90c5469a0b86fc28f3eb5e4c17227cd
Fix: 35159816
Test: make RunSettingsRoboTests

src/com/android/settings/dashboard/suggestions/SuggestionDismissController.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 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.dashboard.suggestions;
+
+import android.content.Context;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+import com.android.settings.R;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settingslib.SuggestionParser;
+import com.android.settingslib.drawer.Tile;
+
+public class SuggestionDismissController extends ItemTouchHelper.SimpleCallback {
+
+    public interface Callback {
+
+        /**
+         * Returns suggestion tile data from the callback
+         */
+        Tile getSuggestionForPosition(int position);
+
+        /**
+         * Called when a suggestion is dismissed.
+         */
+        void onSuggestionDismissed(Tile suggestion);
+    }
+
+    private final Context mContext;
+    private final SuggestionFeatureProvider mSuggestionFeatureProvider;
+    private final SuggestionParser mSuggestionParser;
+    private final Callback mCallback;
+
+    public SuggestionDismissController(Context context, RecyclerView recyclerView,
+            SuggestionParser parser, Callback callback) {
+        super(0, ItemTouchHelper.START | ItemTouchHelper.END);
+        mContext = context;
+        mSuggestionParser = parser;
+        mSuggestionFeatureProvider = FeatureFactory.getFactory(context)
+                .getSuggestionFeatureProvider(context);
+        mCallback = callback;
+        final ItemTouchHelper itemTouchHelper = new ItemTouchHelper(this);
+        itemTouchHelper.attachToRecyclerView(recyclerView);
+    }
+
+    @Override
+    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
+            RecyclerView.ViewHolder target) {
+        return true;
+    }
+
+    @Override
+    public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+        if (viewHolder.getItemViewType() == R.layout.suggestion_tile) {
+            // Only return swipe direction for suggestion tiles. All other types are not swipeable.
+            return super.getSwipeDirs(recyclerView, viewHolder);
+        }
+        return 0;
+    }
+
+    @Override
+    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+        if (mCallback == null) {
+            return;
+        }
+        final Tile suggestion = mCallback.getSuggestionForPosition(viewHolder.getAdapterPosition());
+        mSuggestionFeatureProvider.dismissSuggestion(mContext, mSuggestionParser, suggestion);
+        mCallback.onSuggestionDismissed(suggestion);
+    }
+}