The Tor Browser: layout/xul/nsStackFrame.cpp@141e0f1194b1

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 //

     7 // Eric Vaughan

     8 // Netscape Communications

     9 //

    10 // See documentation in associated header file

    11 //

    13 #include "nsStackFrame.h"

    14 #include "nsStyleContext.h"

    15 #include "nsIContent.h"

    16 #include "nsCOMPtr.h"

    17 #include "nsHTMLParts.h"

    18 #include "nsIPresShell.h"

    19 #include "nsCSSRendering.h"

    20 #include "nsBoxLayoutState.h"

    21 #include "nsStackLayout.h"

    22 #include "nsDisplayList.h"

    24 nsIFrame*

    25 NS_NewStackFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)

    26 {

    27   return new (aPresShell) nsStackFrame(aPresShell, aContext);

    28 }

    30 NS_IMPL_FRAMEARENA_HELPERS(nsStackFrame)

    32 nsStackFrame::nsStackFrame(nsIPresShell* aPresShell, nsStyleContext* aContext):

    33   nsBoxFrame(aPresShell, aContext)

    34 {

    35   nsCOMPtr<nsBoxLayout> layout;

    36   NS_NewStackLayout(aPresShell, layout);

    37   SetLayoutManager(layout);

    38 }

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

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

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

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

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

    45 // a bit more.

    46 void

    47 nsStackFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,

    48                                           const nsRect&           aDirtyRect,

    49                                           const nsDisplayListSet& aLists)

    50 {

    51   // BuildDisplayListForChild puts stacking contexts into the PositionedDescendants

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

    53   // do that.

    54   nsDisplayList* content = aLists.Content();

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

    56   nsIFrame* kid = mFrames.FirstChild();

    57   while (kid) {

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

    59     BuildDisplayListForChild(aBuilder, kid, aDirtyRect, kidLists,

    60                              DISPLAY_CHILD_FORCE_STACKING_CONTEXT);

    61     kid = kid->GetNextSibling();

    62   }

    63 }

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