From 5bf939e934ad71f5dba1267a5307e7fbde32592e Mon Sep 17 00:00:00 2001
From: Yi-Ling Chuang <emilychuang@google.com>
Date: Tue, 26 Mar 2019 17:16:27 +0800
Subject: [PATCH] Add interface for homepapge swipe to dismiss.

- Create an ItemTouchHelper.
- Attach the helper to the recycler view.
- Pass change to the adapter to handle the swipe.

Bug: 126214056
Test: rebuild
Change-Id: I312ee1357158db84f9ee328be4722fe067984604
---
 .../ContextualCardsAdapter.java               |  8 ++-
 .../ContextualCardsFragment.java              | 11 +++-
 .../slices/SwipeDismissalDelegate.java        | 66 +++++++++++++++++++
 3 files changed, 82 insertions(+), 3 deletions(-)
 create mode 100644 src/com/android/settings/homepage/contextualcards/slices/SwipeDismissalDelegate.java

diff --git a/src/com/android/settings/homepage/contextualcards/ContextualCardsAdapter.java b/src/com/android/settings/homepage/contextualcards/ContextualCardsAdapter.java
index 241834ddd13..d6df380239a 100644
--- a/src/com/android/settings/homepage/contextualcards/ContextualCardsAdapter.java
+++ b/src/com/android/settings/homepage/contextualcards/ContextualCardsAdapter.java
@@ -28,6 +28,7 @@ import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.android.settings.homepage.contextualcards.conditional.ConditionContextualCardRenderer;
+import com.android.settings.homepage.contextualcards.slices.SwipeDismissalDelegate.DismissalItemTouchHelperListener;
 import com.android.settings.homepage.contextualcards.slices.SliceContextualCardRenderer;
 
 import java.util.ArrayList;
@@ -35,7 +36,7 @@ import java.util.List;
 import java.util.Map;
 
 public class ContextualCardsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
-        implements ContextualCardUpdateListener {
+        implements ContextualCardUpdateListener, DismissalItemTouchHelperListener {
     static final int SPAN_COUNT = 2;
 
     private static final String TAG = "ContextualCardsAdapter";
@@ -136,4 +137,9 @@ public class ContextualCardsAdapter extends RecyclerView.Adapter<RecyclerView.Vi
 
         //TODO(b/119465242): flickering conditional cards after collapsing/expanding
     }
+
+    @Override
+    public void onSwiped(int position) {
+
+    }
 }
diff --git a/src/com/android/settings/homepage/contextualcards/ContextualCardsFragment.java b/src/com/android/settings/homepage/contextualcards/ContextualCardsFragment.java
index bd258660d4e..0cf553c13a1 100644
--- a/src/com/android/settings/homepage/contextualcards/ContextualCardsFragment.java
+++ b/src/com/android/settings/homepage/contextualcards/ContextualCardsFragment.java
@@ -27,9 +27,11 @@ import android.view.ViewGroup;
 
 import androidx.loader.app.LoaderManager;
 import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.ItemTouchHelper;
 
 import com.android.settings.R;
 import com.android.settings.core.InstrumentedFragment;
+import com.android.settings.homepage.contextualcards.slices.SwipeDismissalDelegate;
 import com.android.settings.overlay.FeatureFactory;
 
 public class ContextualCardsFragment extends InstrumentedFragment implements
@@ -41,6 +43,7 @@ public class ContextualCardsFragment extends InstrumentedFragment implements
     private GridLayoutManager mLayoutManager;
     private ContextualCardsAdapter mContextualCardsAdapter;
     private ContextualCardManager mContextualCardManager;
+    private ItemTouchHelper mItemTouchHelper;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -63,16 +66,20 @@ public class ContextualCardsFragment extends InstrumentedFragment implements
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
+        final Context context = getContext();
         final View rootView = inflater.inflate(R.layout.settings_homepage, container, false);
         mCardsContainer = rootView.findViewById(R.id.card_container);
         mLayoutManager = new GridLayoutManager(getActivity(), SPAN_COUNT,
                 GridLayoutManager.VERTICAL, false /* reverseLayout */);
         mCardsContainer.setLayoutManager(mLayoutManager);
-        mContextualCardsAdapter = new ContextualCardsAdapter(getContext(),
-                this /* lifecycleOwner */, mContextualCardManager);
+        mContextualCardsAdapter = new ContextualCardsAdapter(context, this /* lifecycleOwner */,
+                mContextualCardManager);
         mCardsContainer.setAdapter(mContextualCardsAdapter);
         mContextualCardManager.setListener(mContextualCardsAdapter);
         mCardsContainer.setListener(this);
+        mItemTouchHelper = new ItemTouchHelper(
+                new SwipeDismissalDelegate(context, mContextualCardsAdapter));
+        mItemTouchHelper.attachToRecyclerView(mCardsContainer);
 
         return rootView;
     }
diff --git a/src/com/android/settings/homepage/contextualcards/slices/SwipeDismissalDelegate.java b/src/com/android/settings/homepage/contextualcards/slices/SwipeDismissalDelegate.java
new file mode 100644
index 00000000000..a4186b049c0
--- /dev/null
+++ b/src/com/android/settings/homepage/contextualcards/slices/SwipeDismissalDelegate.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 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.slices;
+
+import android.content.Context;
+import android.graphics.Canvas;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.ItemTouchHelper;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class SwipeDismissalDelegate extends ItemTouchHelper.Callback {
+
+    private static final String TAG = "DismissItemTouchHelper";
+
+    public interface DismissalItemTouchHelperListener {
+        void onSwiped(int position);
+    }
+
+    private final Context mContext;
+    private final DismissalItemTouchHelperListener mListener;
+
+    public SwipeDismissalDelegate(Context context, DismissalItemTouchHelperListener listener) {
+        mContext = context;
+        mListener = listener;
+    }
+
+    @Override
+    public int getMovementFlags(@NonNull RecyclerView recyclerView,
+            @NonNull RecyclerView.ViewHolder viewHolder) {
+        return 0;
+    }
+
+    @Override
+    public boolean onMove(@NonNull RecyclerView recyclerView,
+            @NonNull RecyclerView.ViewHolder viewHolder,
+            @NonNull RecyclerView.ViewHolder target) {
+        return false;
+    }
+
+    @Override
+    public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
+        mListener.onSwiped(viewHolder.getAdapterPosition());
+    }
+
+    @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);
+    }
+}
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