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..f3d98d2cdb4a3afdd78773167e77e69cc01f0b9e
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
@@ -0,0 +1,76 @@
+// 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.CategoryStatus.CategoryStatusEnum;
+import org.chromium.chrome.browser.ntp.snippets.SnippetArticleListItem;
+import org.chromium.chrome.browser.ntp.snippets.SnippetHeaderListItem;
+import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A group of suggestions, with a header, a status card, and a progress indicator.
+ */
+public class SuggestionsSection implements ItemGroup {
+    private final List<SnippetArticleListItem> mSuggestions = new ArrayList<>();
+    private final SnippetHeaderListItem mHeader = new SnippetHeaderListItem();
+    private StatusListItem mStatus;
+    private final ProgressListItem mProgressIndicator = new ProgressListItem();
+
+    public SuggestionsSection(List<SnippetArticleListItem> suggestions,
+            @CategoryStatusEnum int status, NewTabPageAdapter adapter) {
+        // TODO(mvanouwerkerk): Pass in the header text.
+        setSuggestions(suggestions, status, adapter);
+    }
+
+    @Override
+    public List<NewTabPageListItem> getItems() {
+        List<NewTabPageListItem> items = new ArrayList<>();
+        items.add(mHeader);
+        items.addAll(mSuggestions);
+        if (mSuggestions.isEmpty()) {
+            items.add(mStatus);
+            items.add(mProgressIndicator);
+        }
+        return Collections.unmodifiableList(items);
+    }
+
+    public void dismissSuggestion(SnippetArticleListItem suggestion) {
+        mSuggestions.remove(suggestion);
+
+        if (mSuggestions.isEmpty()) {
+            mHeader.setVisible(false);
+        }
+    }
+
+    public boolean hasSuggestions() {
+        return !mSuggestions.isEmpty();
+    }
+
+    public void setSuggestions(List<SnippetArticleListItem> suggestions,
+            @CategoryStatusEnum int status, NewTabPageAdapter adapter) {
+        copyThumbnails(suggestions);
+
+        mHeader.setVisible(!suggestions.isEmpty());
+
+        mStatus = StatusListItem.create(status, adapter);
+        mProgressIndicator.setVisible(SnippetsBridge.isCategoryLoading(status));
+
+        mSuggestions.clear();
+        mSuggestions.addAll(suggestions);
+    }
+
+    private void copyThumbnails(List<SnippetArticleListItem> suggestions) {
+        for (SnippetArticleListItem suggestion : suggestions) {
+            int index = mSuggestions.indexOf(suggestion);
+            if (index == -1) continue;
+
+            suggestion.setThumbnailBitmap(mSuggestions.get(index).getThumbnailBitmap());
+        }
+    }
+}