gecko-dev/layout/xul/nsPopupSetFrame.cpp

/* -*- 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/. */

#include "nsPopupSetFrame.h"
#include "nsGkAtoms.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsBoxLayoutState.h"
#include "nsIScrollableFrame.h"
#include "nsIRootBox.h"
#include "nsMenuPopupFrame.h"

nsIFrame*
NS_NewPopupSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsPopupSetFrame (aPresShell, aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsPopupSetFrame)

void
nsPopupSetFrame::Init(nsIContent*      aContent,
                      nsIFrame*        aParent,
                      nsIFrame*        aPrevInFlow)
{
  nsBoxFrame::Init(aContent, aParent, aPrevInFlow);

  // Normally the root box is our grandparent, but in case of wrapping
  // it can be our great-grandparent.
  nsIRootBox *rootBox = nsIRootBox::GetRootBox(PresContext()->GetPresShell());
  if (rootBox) {
    rootBox->SetPopupSetFrame(this);
  }
}

nsIAtom*
nsPopupSetFrame::GetType() const
{
  return nsGkAtoms::popupSetFrame;
}

NS_IMETHODIMP
nsPopupSetFrame::AppendFrames(ChildListID     aListID,
                              nsFrameList&    aFrameList)
{
  if (aListID == kPopupList) {
    AddPopupFrameList(aFrameList);
    return NS_OK;
  }
  return nsBoxFrame::AppendFrames(aListID, aFrameList);
}

NS_IMETHODIMP
nsPopupSetFrame::RemoveFrame(ChildListID     aListID,
                             nsIFrame*       aOldFrame)
{
  if (aListID == kPopupList) {
    RemovePopupFrame(aOldFrame);
    return NS_OK;
  }
  return nsBoxFrame::RemoveFrame(aListID, aOldFrame);
}

NS_IMETHODIMP
nsPopupSetFrame::InsertFrames(ChildListID     aListID,
                              nsIFrame*       aPrevFrame,
                              nsFrameList&    aFrameList)
{
  if (aListID == kPopupList) {
    AddPopupFrameList(aFrameList);
    return NS_OK;
  }
  return nsBoxFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
}

NS_IMETHODIMP
nsPopupSetFrame::SetInitialChildList(ChildListID     aListID,
                                     nsFrameList&    aChildList)
{
  if (aListID == kPopupList) {
    NS_ASSERTION(mPopupList.IsEmpty(),
                 "SetInitialChildList on non-empty child list");
    AddPopupFrameList(aChildList);
    return NS_OK;
  }
  return nsBoxFrame::SetInitialChildList(aListID, aChildList);
}

const nsFrameList&
nsPopupSetFrame::GetChildList(ChildListID aListID) const
{
  if (kPopupList == aListID) {
    return mPopupList;
  }
  return nsBoxFrame::GetChildList(aListID);
}

void
nsPopupSetFrame::GetChildLists(nsTArray<ChildList>* aLists) const
{
  nsBoxFrame::GetChildLists(aLists);
  mPopupList.AppendIfNonempty(aLists, kPopupList);
}

void
nsPopupSetFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
  mPopupList.DestroyFramesFrom(aDestructRoot);

  // Normally the root box is our grandparent, but in case of wrapping
  // it can be our great-grandparent.
  nsIRootBox *rootBox = nsIRootBox::GetRootBox(PresContext()->GetPresShell());
  if (rootBox) {
    rootBox->SetPopupSetFrame(nullptr);
  }

  nsBoxFrame::DestroyFrom(aDestructRoot);
}

NS_IMETHODIMP
nsPopupSetFrame::DoLayout(nsBoxLayoutState& aState)
{
  // lay us out
  nsresult rv = nsBoxFrame::DoLayout(aState);

  // lay out all of our currently open popups.
  for (nsFrameList::Enumerator e(mPopupList); !e.AtEnd(); e.Next()) {
    nsMenuPopupFrame* popupChild = static_cast<nsMenuPopupFrame*>(e.get());
    popupChild->LayoutPopup(aState, nullptr, nullptr, false);
  }

  return rv;
}

void
nsPopupSetFrame::RemovePopupFrame(nsIFrame* aPopup)
{
  NS_PRECONDITION((aPopup->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
                  aPopup->GetType() == nsGkAtoms::menuPopupFrame,
                  "removing wrong type of frame in popupset's ::popupList");

  mPopupList.DestroyFrame(aPopup);
}

void
nsPopupSetFrame::AddPopupFrameList(nsFrameList& aPopupFrameList)
{
#ifdef DEBUG
  for (nsFrameList::Enumerator e(aPopupFrameList); !e.AtEnd(); e.Next()) {
    NS_ASSERTION((e.get()->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
                 e.get()->GetType() == nsGkAtoms::menuPopupFrame,
                 "adding wrong type of frame in popupset's ::popupList");
  }
#endif
  mPopupList.InsertFrames(nullptr, nullptr, aPopupFrameList);
}