layout/xul/nsStackFrame.cpp@97036ab72558
layout/xul/nsStackFrame.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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 }
