/* -*- 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/. */

//

// Eric Vaughan

// Netscape Communications

//

// See documentation in associated header file

//

#include "nsStackFrame.h"

#include "mozilla/ComputedStyle.h"

#include "nsIContent.h"

#include "nsCOMPtr.h"

#include "nsHTMLParts.h"

#include "nsIPresShell.h"

#include "nsCSSRendering.h"

#include "nsBoxLayoutState.h"

#include "nsStackLayout.h"

#include "nsDisplayList.h"

using namespace mozilla;

nsIFrame*

NS_NewStackFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)

{

  return new (aPresShell) nsStackFrame(aStyle);

}

NS_IMPL_FRAMEARENA_HELPERS(nsStackFrame)

nsStackFrame::nsStackFrame(ComputedStyle* aStyle):

  nsBoxFrame(aStyle, kClassID)

{

  nsCOMPtr<nsBoxLayout> layout;

  NS_NewStackLayout(layout);

  SetXULLayoutManager(layout);

}

// REVIEW: The old code put everything in the background layer. To be more

// consistent with the way other frames work, I'm putting everything in the

// Content() (i.e., foreground) layer (see nsFrame::BuildDisplayListForChild,

// the case for stacking context but non-positioned, non-floating frames).

// This could easily be changed back by hacking nsBoxFrame::BuildDisplayListInternal

// a bit more.

void

nsStackFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,

                                          const nsDisplayListSet& aLists)

{

  // BuildDisplayListForChild puts stacking contexts into the PositionedDescendants

  // list. So we need to map that list to aLists.Content(). This is an easy way to

  // do that.

  nsDisplayList* content = aLists.Content();

  nsDisplayListSet kidLists(content, content, content, content, content, content);

  nsIFrame* kid = mFrames.FirstChild();

  while (kid) {

    // Force each child into its own true stacking context.

    BuildDisplayListForChild(aBuilder, kid, kidLists, DISPLAY_CHILD_FORCE_STACKING_CONTEXT);

    kid = kid->GetNextSibling();

  }

}