author Benjamin Smedberg <>
Mon, 14 Dec 2009 11:26:15 -0500
changeset 36268 f80b4464d261a7ab6c6b340449dda2f7c272b511
parent 30540 ff084019260e93cca76ba924909a2730e211aff6
permissions -rw-r--r--
Revert the electrolysis-plugins-only branch so that the Electrolysis repository can return to its normal (plugins and tabs) state.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * The Original Code is code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 * Alternatively, the contents of this file may be used under the terms of
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 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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#ifndef nsScrollPortView_h___
#define nsScrollPortView_h___

#include "nsView.h"
#include "nsIScrollableView.h"
#include "nsCOMPtr.h"
#include "nsITimer.h"

class nsISupportsArray;
class AsyncScroll;

//this is a class that acts as a container for other views and provides
//automatic management of scrolling of the views it contains.

class nsScrollPortView : public nsView, public nsIScrollableView
  nsScrollPortView(nsViewManager* aViewManager = nsnull);

  virtual nsIScrollableView* ToScrollableView() { return this; }

                            void** aInstancePtr);

  //nsIScrollableView interface
  NS_IMETHOD  GetContainerSize(nscoord *aWidth, nscoord *aHeight) const;
  NS_IMETHOD  SetScrolledView(nsIView *aScrolledView);
  NS_IMETHOD  GetScrolledView(nsIView *&aScrolledView) const;

  NS_IMETHOD  GetScrollPosition(nscoord &aX, nscoord &aY) const;
  NS_IMETHOD  ScrollTo(nscoord aX, nscoord aY, PRUint32 aUpdateFlags);
  NS_IMETHOD  SetLineHeight(nscoord aHeight);
  NS_IMETHOD  GetLineHeight(nscoord *aHeight);
  NS_IMETHOD  ScrollByLines(PRInt32 aNumLinesX, PRInt32 aNumLinesY,
                            PRUint32 aUpdateFlags = 0);
  NS_IMETHOD  ScrollByLinesWithOverflow(PRInt32 aNumLinesX, PRInt32 aNumLinesY,
                                        PRInt32& aOverflowX, PRInt32& aOverflowY,
                                        PRUint32 aUpdateFlags = 0);
  NS_IMETHOD  GetPageScrollDistances(nsSize *aDistances);
  NS_IMETHOD  ScrollByPages(PRInt32 aNumPagesX, PRInt32 aNumPagesY,
                            PRUint32 aUpdateFlags = 0);
  NS_IMETHOD  ScrollByWhole(PRBool aTop, PRUint32 aUpdateFlags = 0);
  NS_IMETHOD  ScrollByPixels(PRInt32 aNumPixelsX, PRInt32 aNumPixelsY,
                             PRInt32& aOverflowX, PRInt32& aOverflowY,
                             PRUint32 aUpdateFlags = 0);
  NS_IMETHOD  CanScroll(PRBool aHorizontal, PRBool aForward, PRBool &aResult);

  NS_IMETHOD_(nsIView*) View();

  NS_IMETHOD  AddScrollPositionListener(nsIScrollPositionListener* aListener);
  NS_IMETHOD  RemoveScrollPositionListener(nsIScrollPositionListener* aListener);

  // local to the view module

  nsView*     GetScrolledView() const { return GetFirstChild(); }

  NS_IMETHOD  ScrollToImpl(nscoord aX, nscoord aY);

  // data members
  AsyncScroll* mAsyncScroll;

  // methods
  void        IncrementalScroll();
  PRBool      IsSmoothScrollingEnabled();
  static void AsyncScrollCallback(nsITimer *aTimer, void* aSPV);

  virtual ~nsScrollPortView();

  void Scroll(nsView *aScrolledView, nsPoint aTwipsDelta,
              nsIntPoint aPixDelta, nscoord aP2A,
              const nsTArray<nsIWidget::Configuration>& aConfigurations);
  PRBool CannotBitBlt(nsView* aScrolledView);
  nsresult CalcScrollOverflow(nscoord aX, nscoord aY, PRInt32& aOverflowX, PRInt32& aOverflowY);

  nscoord             mOffsetX, mOffsetY;
  nscoord             mDestinationX, mDestinationY;
  nscoord             mLineHeight;
  nsISupportsArray   *mListeners;