layout/generic/nsAutoCopyListener.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef nsAutoCopyListener_h_
   7 #define nsAutoCopyListener_h_
   8
   9 #include "nsISelectionListener.h"
  10 #include "nsISelectionPrivate.h"
  11 #include "mozilla/Attributes.h"
  12
  13 class nsAutoCopyListener MOZ_FINAL : public nsISelectionListener
  14 {
  15 public:
  16   NS_DECL_ISUPPORTS
  17   NS_DECL_NSISELECTIONLISTENER
  18
  19   void Listen(nsISelectionPrivate *aSelection)
  20   {
  21       NS_ASSERTION(aSelection, "Null selection passed to Listen()");
  22       aSelection->AddSelectionListener(this);
  23   }
  24
  25   static nsAutoCopyListener* GetInstance()
  26   {
  27     if (!sInstance) {
  28       sInstance = new nsAutoCopyListener();
  29
  30       NS_ADDREF(sInstance);
  31     }
  32
  33     return sInstance;
  34   }
  35
  36   static void Shutdown()
  37   {
  38     NS_IF_RELEASE(sInstance);
  39   }
  40
  41 private:
  42   ~nsAutoCopyListener() {}
  43
  44   static nsAutoCopyListener* sInstance;
  45 };
  46
  47 #endif