Zine: support multiple sections in the ui

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
new file mode 100644
index 0000000000000000000000000000000000000000..15c68438fe4c89c3de0d603e98c59933a16949b2
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
@@ -0,0 +1,68 @@
+// Copyright 2016 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.ntp.cards;
+
+import org.chromium.chrome.browser.ntp.snippets.KnownCategories.KnownCategoriesEnum;
+import org.chromium.chrome.browser.ntp.snippets.SnippetArticleListItem;
+import org.chromium.chrome.browser.ntp.snippets.SnippetHeaderListItem;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A group of suggestions, with a header and a status card.
+ */
+public class SuggestionsSection implements NewTabPageItemGroup {
+    private final List<NewTabPageListItem> mItems;
+    private final SnippetHeaderListItem mHeader;
+    private StatusListItem mStatus;
+
+    SuggestionsSection(List<SnippetArticleListItem> suggestions,
+            @KnownCategoriesEnum int status, NewTabPageAdapter adapter) {
+        mItems = new ArrayList<>();
+
+        // TODO(mvanouwerkerk): Pass in the header text.
+        mHeader = new SnippetHeaderListItem();
+
+        setSuggestions(suggestions, status, adapter);
+    }
+
+    @Override
+    public List<NewTabPageListItem> getItems() {
+        return mItems;
+    }
+
+    public void dismissSuggestion(SnippetArticleListItem suggestion) {
+        mItems.remove(suggestion);
+
+        if (!hasSuggestions() && !mItems.contains(mStatus)) {
+            mItems.add(mStatus);
+            mHeader.setVisible(false);
+        }
+    }
+
+    public boolean hasSuggestions() {
+        for (NewTabPageListItem item : mItems) {
+            if (item instanceof SnippetArticleListItem) return true;
+        }
+        return false;
+    }
+
+    public void setSuggestions(List<SnippetArticleListItem> suggestions,
+            @KnownCategoriesEnum int status, NewTabPageAdapter adapter) {
+        mItems.clear();
+
+        mItems.add(mHeader);
+        mHeader.setVisible(!suggestions.isEmpty());
+
+        mStatus = StatusListItem.create(status, adapter);
+
+        if (suggestions.isEmpty()) {
+            mItems.add(mStatus);
+        } else {
+            mItems.addAll(suggestions);
+        }
+    }
+}