/* -*- 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 nsXMLPrettyPrinter_h__
#define nsXMLPrettyPrinter_h__

#include "nsStubDocumentObserver.h"
#include "nsCOMPtr.h"

class nsIDocument;

class nsXMLPrettyPrinter : public nsStubDocumentObserver {
 public:
  nsXMLPrettyPrinter();

  NS_DECL_ISUPPORTS

  // nsIMutationObserver
  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED

  /**
   * This will prettyprint the document if the document is loaded in a
   * displayed window.
   *
   * @param aDocument  document to prettyprint
   * @param [out] aDidPrettyPrint if true, and error not returned, actually
   *              went ahead with prettyprinting the document.
   */
  nsresult PrettyPrint(nsIDocument* aDocument, bool* aDidPrettyPrint);

  /**
   * Unhook the prettyprinter
   */
  void Unhook();

 private:
  virtual ~nsXMLPrettyPrinter();

  /**
   * Signals for unhooking by setting mUnhookPending if the node changed is
   * non-anonymous content.
   *
   * @param aContent  content that has changed
   */
  void MaybeUnhook(nsIContent* aContent);

  nsIDocument* mDocument;  // weak. Set as long as we're observing the document
  bool mUnhookPending;
};

nsresult NS_NewXMLPrettyPrinter(nsXMLPrettyPrinter** aPrinter);

#endif  // nsXMLPrettyPrinter_h__