Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ChildNode.java |
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ChildNode.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ChildNode.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f08e2a9c1101a348bb0628046ba2cacd20490441 |
--- /dev/null |
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ChildNode.java |
@@ -0,0 +1,42 @@ |
+// 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; |
+ |
+/** |
+ * A node in the tree that has a parent and can notify it about changes. |
+ * |
+ * This class mostly serves as a convenience base class for implementations of {@link TreeNode}. |
+ */ |
+public abstract class ChildNode implements TreeNode { |
+ private final NodeParent mParent; |
+ |
+ protected ChildNode(NodeParent parent) { |
+ mParent = parent; |
+ } |
+ |
+ protected void notifyItemRangeChanged(int index, int count) { |
+ mParent.onItemRangeChanged(this, index, count); |
+ } |
+ |
+ protected void notifyItemRangeInserted(int index, int count) { |
+ mParent.onItemRangeInserted(this, index, count); |
+ } |
+ |
+ protected void notifyItemRangeRemoved(int index, int count) { |
+ mParent.onItemRangeRemoved(this, index, count); |
+ } |
+ |
+ protected void notifyItemChanged(int index) { |
+ notifyItemRangeChanged(index, 1); |
+ } |
+ |
+ protected void notifyItemInserted(int index) { |
+ notifyItemRangeInserted(index, 1); |
+ } |
+ |
+ protected void notifyItemRemoved(int index) { |
+ notifyItemRangeRemoved(index, 1); |
+ } |
+} |