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       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef nsIScrollObserver_h___
       8             : #define nsIScrollObserver_h___
       9             : 
      10             : #include "nsISupports.h"
      11             : #include "Units.h"
      12             : 
      13             : #define NS_ISCROLLOBSERVER_IID \
      14             :   { 0xaa5026eb, 0x2f88, 0x4026, \
      15             :     { 0xa4, 0x6b, 0xf4, 0x59, 0x6b, 0x4e, 0xdf, 0x00 } }
      16             : 
      17           0 : class nsIScrollObserver : public nsISupports
      18             : {
      19             : public:
      20             :   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCROLLOBSERVER_IID)
      21             : 
      22             :   /**
      23             :    * Called when the scroll position of some element has changed.
      24             :    */
      25             :   virtual void ScrollPositionChanged() = 0;
      26             : 
      27             :   /**
      28             :    * Called when an async panning/zooming transform has started being applied
      29             :    * and passed the scroll offset
      30             :    */
      31           0 :   virtual void AsyncPanZoomStarted() {};
      32             : 
      33             :   /**
      34             :    * Called when an async panning/zooming transform is no longer applied
      35             :    * and passed the scroll offset
      36             :    */
      37           0 :   virtual void AsyncPanZoomStopped() {};
      38             : };
      39             : 
      40             : NS_DEFINE_STATIC_IID_ACCESSOR(nsIScrollObserver, NS_ISCROLLOBSERVER_IID)
      41             : 
      42             : #endif /* nsIScrollObserver_h___ */