diff -r 000000000000 -r 6474c204b198 layout/xul/nsDeckFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsDeckFrame.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,202 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsDeckFrame.h"
+#include "nsStyleContext.h"
+#include "nsPresContext.h"
+#include "nsIContent.h"
+#include "nsCOMPtr.h"
+#include "nsNameSpaceManager.h"
+#include "nsGkAtoms.h"
+#include "nsHTMLParts.h"
+#include "nsIPresShell.h"
+#include "nsCSSRendering.h"
+#include "nsViewManager.h"
+#include "nsBoxLayoutState.h"
+#include "nsStackLayout.h"
+#include "nsDisplayList.h"
+#include "nsContainerFrame.h"
+
+#ifdef ACCESSIBILITY
+#include "nsAccessibilityService.h"
+#endif
+
+nsIFrame*
+NS_NewDeckFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsDeckFrame(aPresShell, aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsDeckFrame)
+
+NS_QUERYFRAME_HEAD(nsDeckFrame)
+  NS_QUERYFRAME_ENTRY(nsDeckFrame)
+NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
+
+
+nsDeckFrame::nsDeckFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+  : nsBoxFrame(aPresShell, aContext), mIndex(0)
+{
+  nsCOMPtr<nsBoxLayout> layout;
+  NS_NewStackLayout(aPresShell, layout);
+  SetLayoutManager(layout);
+}
+
+nsIAtom*
+nsDeckFrame::GetType() const
+{
+  return nsGkAtoms::deckFrame;
+}
+
+nsresult
+nsDeckFrame::AttributeChanged(int32_t         aNameSpaceID,
+                              nsIAtom*        aAttribute,
+                              int32_t         aModType)
+{
+  nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
+                                             aModType);
+
+
+   // if the index changed hide the old element and make the new element visible
+  if (aAttribute == nsGkAtoms::selectedIndex) {
+    IndexChanged();
+  }
+
+  return rv;
+}
+
+void
+nsDeckFrame::Init(nsIContent*     aContent,
+                  nsIFrame*       aParent,
+                  nsIFrame*       aPrevInFlow)
+{
+  nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
+
+  mIndex = GetSelectedIndex();
+}
+
+void
+nsDeckFrame::HideBox(nsIFrame* aBox)
+{
+  nsIPresShell::ClearMouseCapture(aBox);
+}
+
+void
+nsDeckFrame::IndexChanged()
+{
+  //did the index change?
+  int32_t index = GetSelectedIndex();
+  if (index == mIndex)
+    return;
+
+  // redraw
+  InvalidateFrame();
+
+  // hide the currently showing box
+  nsIFrame* currentBox = GetSelectedBox();
+  if (currentBox) // only hide if it exists
+    HideBox(currentBox);
+
+  mIndex = index;
+
+#ifdef ACCESSIBILITY
+  nsAccessibilityService* accService = GetAccService();
+  if (accService) {
+    accService->DeckPanelSwitched(PresContext()->GetPresShell(), mContent,
+                                  currentBox, GetSelectedBox());
+  }
+#endif
+}
+
+int32_t
+nsDeckFrame::GetSelectedIndex()
+{
+  // default index is 0
+  int32_t index = 0;
+
+  // get the index attribute
+  nsAutoString value;
+  if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::selectedIndex, value))
+  {
+    nsresult error;
+
+    // convert it to an integer
+    index = value.ToInteger(&error);
+  }
+
+  return index;
+}
+
+nsIFrame* 
+nsDeckFrame::GetSelectedBox()
+{
+  return (mIndex >= 0) ? mFrames.FrameAt(mIndex) : nullptr; 
+}
+
+void
+nsDeckFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                              const nsRect&           aDirtyRect,
+                              const nsDisplayListSet& aLists)
+{
+  // if a tab is hidden all its children are too.
+  if (!StyleVisibility()->mVisible)
+    return;
+    
+  nsBoxFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
+}
+
+void
+nsDeckFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
+                                         const nsRect&           aDirtyRect,
+                                         const nsDisplayListSet& aLists)
+{
+  // only paint the selected box
+  nsIFrame* box = GetSelectedBox();
+  if (!box)
+    return;
+
+  // Putting the child in the background list. This is a little weird but
+  // it matches what we were doing before.
+  nsDisplayListSet set(aLists, aLists.BlockBorderBackgrounds());
+  BuildDisplayListForChild(aBuilder, box, aDirtyRect, set);
+}
+
+NS_IMETHODIMP
+nsDeckFrame::DoLayout(nsBoxLayoutState& aState)
+{
+  // Make sure we tweak the state so it does not resize our children.
+  // We will do that.
+  uint32_t oldFlags = aState.LayoutFlags();
+  aState.SetLayoutFlags(NS_FRAME_NO_SIZE_VIEW | NS_FRAME_NO_VISIBILITY);
+
+  // do a normal layout
+  nsresult rv = nsBoxFrame::DoLayout(aState);
+
+  // run though each child. Hide all but the selected one
+  nsIFrame* box = GetChildBox();
+
+  nscoord count = 0;
+  while (box) 
+  {
+    // make collapsed children not show up
+    if (count != mIndex) 
+      HideBox(box);
+
+    box = box->GetNextBox();
+    count++;
+  }
+
+  aState.SetLayoutFlags(oldFlags);
+
+  return rv;
+}
+