author Gregory Szorc <>
Wed, 28 Jan 2015 13:37:00 -0800
changeset 82239 1de52eba8db705a804849f9ccfc4b4d7226111f7
parent 79188 00f422b2cf36505e1ee8768e09997237be8294c0
permissions -rw-r--r--
Close old release branch GECKO1008_2012100515_RELBRANCH

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 * 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
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * 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
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * ***** END LICENSE BLOCK ***** */

 * rendering object that is the root of the frame tree, which contains
 * the document's scrollbars and contains fixed-positioned elements

#ifndef nsViewportFrame_h___
#define nsViewportFrame_h___

#include "nsContainerFrame.h"
#include "nsGkAtoms.h"

class nsPresContext;

  * ViewportFrame is the parent of a single child - the doc root frame or a scroll frame 
  * containing the doc root frame. ViewportFrame stores this child in its primary child 
  * list.
class ViewportFrame : public nsContainerFrame {

  typedef nsContainerFrame Super;

  ViewportFrame(nsStyleContext* aContext)
    : nsContainerFrame(aContext)
  virtual ~ViewportFrame() { } // useful for debugging

  virtual void DestroyFrom(nsIFrame* aDestructRoot);

  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        asPrevInFlow);

  NS_IMETHOD SetInitialChildList(ChildListID     aListID,
                                 nsFrameList&    aChildList);

  NS_IMETHOD AppendFrames(ChildListID     aListID,
                          nsFrameList&    aFrameList);

  NS_IMETHOD InsertFrames(ChildListID     aListID,
                          nsIFrame*       aPrevFrame,
                          nsFrameList&    aFrameList);

  NS_IMETHOD RemoveFrame(ChildListID     aListID,
                         nsIFrame*       aOldFrame);

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
  NS_IMETHOD Reflow(nsPresContext*          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus);

   * Get the "type" of the frame
   * @see nsGkAtoms::viewportFrame
  virtual nsIAtom* GetType() const;

  virtual void InvalidateInternal(const nsRect& aDamageRect,
                                  nscoord aX, nscoord aY, nsIFrame* aForChild,
                                  PRUint32 aFlags);

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;

  virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const { return kFixedList; }

  nsPoint AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;

#endif // nsViewportFrame_h___