diff -r 000000000000 -r 6474c204b198 layout/xul/tree/nsTreeContentView.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/tree/nsTreeContentView.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsTreeContentView_h__
+#define nsTreeContentView_h__
+
+#include "nsAutoPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsTArray.h"
+#include "nsStubDocumentObserver.h"
+#include "nsITreeBoxObject.h"
+#include "nsITreeColumns.h"
+#include "nsITreeView.h"
+#include "nsITreeContentView.h"
+#include "nsITreeSelection.h"
+#include "mozilla/Attributes.h"
+
+class nsIDocument;
+class Row;
+
+nsresult NS_NewTreeContentView(nsITreeView** aResult);
+
+class nsTreeContentView MOZ_FINAL : public nsINativeTreeView,
+                                    public nsITreeContentView,
+                                    public nsStubDocumentObserver
+{
+  public:
+    nsTreeContentView(void);
+
+    ~nsTreeContentView(void);
+
+    NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+    NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsTreeContentView,
+                                             nsINativeTreeView)
+
+    NS_DECL_NSITREEVIEW
+    // nsINativeTreeView: Untrusted code can use us
+    NS_IMETHOD EnsureNative() MOZ_OVERRIDE { return NS_OK; }
+
+    NS_DECL_NSITREECONTENTVIEW
+
+    // nsIDocumentObserver
+    NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+    NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+    NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+    NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+    NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+    static bool CanTrustTreeSelection(nsISupports* aValue);
+
+  protected:
+    // Recursive methods which deal with serializing of nested content.
+    void Serialize(nsIContent* aContent, int32_t aParentIndex, int32_t* aIndex,
+                   nsTArray<nsAutoPtr<Row> >& aRows);
+
+    void SerializeItem(nsIContent* aContent, int32_t aParentIndex,
+                       int32_t* aIndex, nsTArray<nsAutoPtr<Row> >& aRows);
+
+    void SerializeSeparator(nsIContent* aContent, int32_t aParentIndex,
+                            int32_t* aIndex, nsTArray<nsAutoPtr<Row> >& aRows);
+
+    void GetIndexInSubtree(nsIContent* aContainer, nsIContent* aContent, int32_t* aResult);
+    
+    // Helper methods which we use to manage our plain array of rows.
+    int32_t EnsureSubtree(int32_t aIndex);
+
+    int32_t RemoveSubtree(int32_t aIndex);
+
+    int32_t InsertRow(int32_t aParentIndex, int32_t aIndex, nsIContent* aContent);
+
+    void InsertRowFor(nsIContent* aParent, nsIContent* aChild);
+
+    int32_t RemoveRow(int32_t aIndex);
+
+    void ClearRows();
+    
+    void OpenContainer(int32_t aIndex);
+
+    void CloseContainer(int32_t aIndex);
+
+    int32_t FindContent(nsIContent* aContent);
+
+    void UpdateSubtreeSizes(int32_t aIndex, int32_t aCount);
+
+    void UpdateParentIndexes(int32_t aIndex, int32_t aSkip, int32_t aCount);
+
+    // Content helpers.
+    nsIContent* GetCell(nsIContent* aContainer, nsITreeColumn* aCol);
+
+  private:
+    nsCOMPtr<nsITreeBoxObject>          mBoxObject;
+    nsCOMPtr<nsITreeSelection>          mSelection;
+    nsCOMPtr<nsIContent>                mRoot;
+    nsCOMPtr<nsIContent>                mBody;
+    nsIDocument*                        mDocument;      // WEAK
+    nsTArray<nsAutoPtr<Row> >           mRows;
+};
+
+#endif // nsTreeContentView_h__