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chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsBottomSheetContent.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.suggestions;
 
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.OnScrollListener;
+import android.view.LayoutInflater;
 import android.view.View;
 
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.NativePageHost;
 import org.chromium.chrome.browser.ntp.ContextMenuManager;
 import org.chromium.chrome.browser.ntp.cards.NewTabPageAdapter;
 import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
 import org.chromium.chrome.browser.ntp.snippets.SuggestionsSource;
 import org.chromium.chrome.browser.offlinepages.OfflinePageBridge;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.chrome.browser.widget.FadingShadow;
+import org.chromium.chrome.browser.widget.FadingShadowView;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetContentController;
 import org.chromium.chrome.browser.widget.bottomsheet.EmptyBottomSheetObserver;
 import org.chromium.chrome.browser.widget.displaystyle.UiConfig;
 
 /**
  * Provides content to be displayed inside of the Home tab of bottom sheet.
  *
  * TODO(dgn): If the bottom sheet view is not recreated across tab changes, it will have to be
  * notified of it, at least when it is pulled up on the new tab.
  */
 public class SuggestionsBottomSheetContent implements BottomSheet.BottomSheetContent {
     private static SuggestionsSource sSuggestionsSourceForTesting;
     private static SuggestionsMetricsReporter sMetricsReporterForTesting;
 
+    private final View mView;
+    private final FadingShadowView mShadowView;
     private final SuggestionsRecyclerView mRecyclerView;
     private final ContextMenuManager mContextMenuManager;
     private final SuggestionsUiDelegateImpl mSuggestionsManager;
     private final TileGroup.Delegate mTileGroupDelegate;
 
     public SuggestionsBottomSheetContent(
             final ChromeActivity activity, NativePageHost host, TabModelSelector tabModelSelector) {
 
         Profile profile = Profile.getLastUsedProfile();
         SuggestionsNavigationDelegate navigationDelegate =
                 new SuggestionsNavigationDelegateImpl(activity, profile, host, tabModelSelector);
         mTileGroupDelegate =
                 new TileGroupDelegateImpl(activity, profile, tabModelSelector, navigationDelegate);
         mSuggestionsManager = createSuggestionsDelegate(profile, navigationDelegate, host);
 
-        mRecyclerView = new SuggestionsRecyclerView(activity);
+        mView = LayoutInflater.from(activity).inflate(
+                R.layout.suggestions_bottom_sheet_content, null);
+        mRecyclerView = (SuggestionsRecyclerView) mView.findViewById(R.id.recycler_view);
         mContextMenuManager = new ContextMenuManager(activity, navigationDelegate, mRecyclerView);
         activity.getWindowAndroid().addContextMenuCloseListener(mContextMenuManager);
         mSuggestionsManager.addDestructionObserver(new DestructionObserver() {
             @Override
             public void onDestroy() {
                 activity.getWindowAndroid().removeContextMenuCloseListener(mContextMenuManager);
             }
         });
 
         UiConfig uiConfig = new UiConfig(mRecyclerView);
 
         // This mAdapter does not fetch until later requested, when the sheet is opened.
         final NewTabPageAdapter adapter = new NewTabPageAdapter(mSuggestionsManager,
                 /* aboveTheFoldView = */ null, uiConfig, OfflinePageBridge.getForProfile(profile),
                 mContextMenuManager, mTileGroupDelegate);
         mRecyclerView.setAdapter(adapter);
 
         activity.getBottomSheet().addObserver(new EmptyBottomSheetObserver() {
             @Override
             public void onSheetOpened() {
                 adapter.refreshSuggestions();
             }
         });
 
         if (activity.getBottomSheet().getSheetState() != BottomSheet.SHEET_STATE_PEEK) {
             adapter.refreshSuggestions();
         }
+
+        mShadowView = (FadingShadowView) mView.findViewById(R.id.shadow);
+        mShadowView.init(
+                ApiCompatibilityUtils.getColor(mView.getResources(), R.color.toolbar_shadow_color),
+                FadingShadow.POSITION_TOP);
+
+        mRecyclerView.addOnScrollListener(new OnScrollListener() {
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+                boolean shadowVisible = mRecyclerView.canScrollVertically(-1);
+                mShadowView.setVisibility(shadowVisible ? View.VISIBLE : View.GONE);
+            }
+        });
     }
 
     @Override
     public View getContentView() {
-        return mRecyclerView;
+        return mView;
     }
 
     @Override
     public View getToolbarView() {
         return null;
     }
 
     @Override
     public int getVerticalScrollOffset() {
         return mRecyclerView.computeVerticalScrollOffset();
@@ skipping 42 matching lines @@
             metricsReporter = sMetricsReporterForTesting;
         }
 
         SuggestionsUiDelegateImpl delegate = new SuggestionsUiDelegateImpl(
                 suggestionsSource, metricsReporter, navigationDelegate, profile, host);
         if (snippetsBridge != null) delegate.addDestructionObserver(snippetsBridge);
 
         return delegate;
     }
 }