Support action button to fetch more content suggestions

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java
index 9d93dab4d19143fbeb01667f0140eea3f0bddec2..4469870cbcaa6d43211640c2982038e5f907c939 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionListItem.java
@@ -9,27 +9,56 @@ import android.view.View;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
 import org.chromium.chrome.browser.ntp.UiConfig;
+import org.chromium.chrome.browser.ntp.snippets.KnownCategories;
+import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
+import org.chromium.chrome.browser.ntp.snippets.SuggestionsSource;
 
 /**
  * Item that allows the user to perform an action on the NTP.
  */
 class ActionListItem implements NewTabPageListItem {
+    private final int mCategory;
+
+    public ActionListItem(int category) {
+        mCategory = category;
+    }
+
     @Override
     public int getType() {
         return NewTabPageListItem.VIEW_TYPE_ACTION;
     }
 
+    public int getCategory() {
+        return mCategory;
+    }
+
     public static class ViewHolder extends CardViewHolder {
+        private ActionListItem mAction;

[Michael van Ouwerkerk, 2016/08/10 10:09:29]

nit: I think we might want to distinguish items, views, and view holders more
clearly throughout our code. Maybe rename this to mActionItem.

[Philipp Keck, 2016/08/10 13:14:46]

Done. mActionListItem for consistency with the full "TextView" suffix elsewhere.

+
         public ViewHolder(NewTabPageRecyclerView recyclerView, final NewTabPageManager manager,
-                UiConfig uiConfig) {
+                final SuggestionsSource suggestionsSource, UiConfig uiConfig) {
             super(R.layout.new_tab_page_action_card, recyclerView, uiConfig);
             itemView.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
-                    // TODO(dgn): Implement other behaviours.
-                    manager.navigateToBookmarks();
+                    int category = mAction.getCategory();
+                    if (SnippetsBridge.isKnownCategory(category, KnownCategories.BOOKMARKS)) {
+                        manager.navigateToBookmarks();
+                    } else if (SnippetsBridge.isKnownCategory(
+                                       category, KnownCategories.OFFLINE_PAGES)) {
+                        // TODO(pke): Implement.
+                        // org.chromium.chrome.browser.download.DownloadUtils.showDownloadManager
+                    } else {
+                        suggestionsSource.fetchMoreSuggestions(category);
+                    }
                 }
             });
         }
+
+        @Override
+        public void onBindViewHolder(NewTabPageListItem item) {
+            super.onBindViewHolder(item);
+            mAction = (ActionListItem) item;
+        }
     }
 }