layout/generic/nsIScrollPositionListener.h
author Boris Zbarsky <bzbarsky@mit.edu>
Sat, 11 May 2019 08:28:29 +0000
changeset 532359 6103006e3172f0ef258a30256b8cc7a6553e7f14
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1550937. Stop using [array] in nsIEventListenerService. r=smaug Differential Revision: https://phabricator.services.mozilla.com/D30773

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 nsIScrollPositionListener_h___
#define nsIScrollPositionListener_h___

#include "nsCoord.h"

/**
 * Provides a way to learn about scroll position changes of
 * nsIScrollableFrame's.
 */
class nsIScrollPositionListener {
 public:
  virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) = 0;
  virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) = 0;
};

#endif /* nsIScrollPositionListener_h___ */