Attachment #805978 for bug #907396

Attachment #805978: Frame manager support for display:contents for bug #907396

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#include "ChildIterator.h"

#include "nsFrameManager.h"
#include "GeckoProfiler.h"
#include "nsIStatefulFrame.h"

  #ifdef DEBUG
    //#define DEBUG_UNDISPLAYED_MAP
    //#define DEBUG_DISPLAYCONTENTS_MAP
  #else
    #undef DEBUG_UNDISPLAYED_MAP
    #undef DEBUG_DISPLAYCONTENTS_MAP
  #endif

using namespace mozilla;
using namespace mozilla::dom;

//----------------------------------------------------------------------

struct PlaceholderMapEntry : public PLDHashEntryHdr {


  NS_HIDDEN_(nsresult) AddNodeFor(nsIContent* aParentContent,
                                  nsIContent* aChild, nsStyleContext* aStyle);

  NS_HIDDEN_(void) RemoveNodeFor(nsIContent* aParentContent,
                                 UndisplayedNode* aNode);

  NS_HIDDEN_(void) RemoveNodesFor(nsIContent* aParentContent);
  NS_HIDDEN_(UndisplayedNode*) UnlinkNodesFor(nsIContent* aParentContent);

  // Removes all entries from the hash table
  NS_HIDDEN_(void)  Clear(void);

protected:
  /**
   * Gets the entry for the provided parent content. If the content
   * is a <xbl:children> element, |**aParentContent| is set to


  if (mRootFrame) {
    mRootFrame->Destroy();
    mRootFrame = nullptr;
  }
  
  delete mUndisplayedMap;
  mUndisplayedMap = nullptr;
  delete mDisplayContentsMap;
  mDisplayContentsMap = nullptr;

  mPresShell = nullptr;
}

//----------------------------------------------------------------------

// Placeholder frame functions
nsPlaceholderFrame*

        nsStyleContext *context = GetUndisplayedContent(aContent);
        NS_ASSERTION(context == nullptr, "Found more undisplayed content data after removal");
#endif
        return;
      }
      node = node->mNext;
    }
  }
#ifdef DEBUG_UNDISPLAYED_MAP
  printf( "not found.\n");
#endif
}

void
nsFrameManager::ClearAllUndisplayedContentIn(nsIContent* aParentContent)
{
#ifdef DEBUG_UNDISPLAYED_MAP
  static int i = 0;
  printf("ClearAllUndisplayedContentIn(%d): parent=%p \n", i++, (void*)aParentContent);

  for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
    if (child->GetParent() != aParentContent) {
      ClearUndisplayedContentIn(child, child->GetParent());
    }
  }
}

//----------------------------------------------------------------------

nsStyleContext*
nsFrameManager::GetDisplayContents(nsIContent* aContent)
{
  if (!aContent || !mDisplayContentsMap) {
    return nullptr;
  }
  nsIContent* parent = aContent->GetParent();
  for (UndisplayedNode* node = mDisplayContentsMap->GetFirstNode(parent);
         node; node = node->mNext) {
    if (node->mContent == aContent) {
      return node->mStyle;
    }
  }
  return nullptr;
}

UndisplayedNode*
nsFrameManager::GetAllDisplayContentsIn(nsIContent* aParentContent)
{
  return mDisplayContentsMap ? mDisplayContentsMap->GetFirstNode(aParentContent)
    : nullptr;
}

void
nsFrameManager::SetDisplayContents(nsIContent* aContent, 
                                   nsStyleContext* aStyleContext)
{
  NS_PRECONDITION(!aStyleContext->GetPseudo(),
                  "Should only have actual elements here");

#ifdef DEBUG_DISPLAYCONTENTS_MAP
  static int i = 0;
  printf("SetDisplayContents(%d): aContent=%p \n", i++, (void *)aContent);
#endif

  NS_ASSERTION(!GetDisplayContents(aContent),
               "Already have an undisplayed context entry for aContent");

  if (!mDisplayContentsMap) {
    mDisplayContentsMap = new UndisplayedMap;
  }
  nsIContent* parent = aContent->GetParent();
  NS_ASSERTION(parent || (mPresShell && mPresShell->GetDocument() &&
               mPresShell->GetDocument()->GetRootElement() == aContent),
               "undisplayed content must have a parent, unless it's the root "
               "element");
  mDisplayContentsMap->AddNodeFor(parent, aContent, aStyleContext);
}

void
nsFrameManager::ChangeDisplayContents(nsIContent* aContent, 
                                      nsStyleContext* aStyleContext)
{
  NS_ASSERTION(mDisplayContentsMap, "no existing display:contents content");
  
#ifdef DEBUG_DISPLAYCONTENTS_MAP
   static int i = 0;
   printf("ChangeDisplayContents(%d): aContent=%p \n", i++, (void *)aContent);
#endif

  for (UndisplayedNode* node = mDisplayContentsMap->GetFirstNode(aContent->GetParent());
         node; node = node->mNext) {
    if (node->mContent == aContent) {
      node->mStyle = aStyleContext;
      return;
    }
  }

  NS_NOTREACHED("no existing display:contents content");
}

void
nsFrameManager::ClearDisplayContentsIn(nsIContent* aContent,
                                       nsIContent* aParentContent)
{
#ifdef DEBUG_DISPLAYCONTENTS_MAP
  static int i = 0;
  printf("ClearDisplayContents(%d): content=%p parent=%p --> ", i++, (void *)aContent, (void*)aParentContent);
#endif
  
  if (mDisplayContentsMap) {
    UndisplayedNode* node = mDisplayContentsMap->GetFirstNode(aParentContent);
    while (node) {
      if (node->mContent == aContent) {
        mDisplayContentsMap->RemoveNodeFor(aParentContent, node);

#ifdef DEBUG_DISPLAYCONTENTS_MAP
        printf( "REMOVED!\n");
#endif
#ifdef DEBUG
        // make sure that there are no more entries for the same content
        nsStyleContext* context = GetDisplayContents(aContent);
        NS_ASSERTION(context == nullptr, "Found more entries for aContent after removal");
#endif
        ClearAllDisplayContentsIn(aContent);
        ClearAllUndisplayedContentIn(aContent);
        return;
      }
      node = node->mNext;
    }
  }
#ifdef DEBUG_DISPLAYCONTENTS_MAP
  printf( "not found.\n");
#endif
}

void
nsFrameManager::ClearAllDisplayContentsIn(nsIContent* aParentContent)
{
#ifdef DEBUG_DISPLAYCONTENTS_MAP
  static int i = 0;
  printf("ClearAllDisplayContentsIn(%d): parent=%p \n", i++, (void*)aParentContent);
#endif

  if (mDisplayContentsMap) {
    UndisplayedNode* cur = mDisplayContentsMap->UnlinkNodesFor(aParentContent);
    while (cur) {
      UndisplayedNode* next = cur->mNext;
      cur->mNext = nullptr;
      ClearAllDisplayContentsIn(cur->mContent);
      ClearAllUndisplayedContentIn(cur->mContent);
      delete cur;
      cur = next;
    }
  }

  // Need to look at aParentContent's content list due to XBL insertions.
  // Nodes in aParentContent's content list do not have aParentContent as a
  // parent, but are treated as children of aParentContent. We iterate over
  // the flattened content list and just ignore any nodes we don't care about.
  FlattenedChildIterator iter(aParentContent);
  for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
    if (child->GetParent() != aParentContent) {
      ClearDisplayContentsIn(child, child->GetParent());
      ClearUndisplayedContentIn(child, child->GetParent());
    }
  }
}

//----------------------------------------------------------------------
nsresult
nsFrameManager::AppendFrames(nsIFrame*       aParentFrame,
                             ChildListID     aListID,
                             nsFrameList&    aFrameList)
{
  if (aParentFrame->IsAbsoluteContainer() &&
      aListID == aParentFrame->GetAbsoluteListID()) {
    return aParentFrame->GetAbsoluteContainingBlock()->

//----------------------------------------------------------------------

void
nsFrameManager::NotifyDestroyingFrame(nsIFrame* aFrame)
{
  nsIContent* content = aFrame->GetContent();
  if (content && content->GetPrimaryFrame() == aFrame) {
    ClearAllUndisplayedContentIn(content);
    ClearAllDisplayContentsIn(content);
  }
}

// Capture state for a given frame.
// Accept a content id here, in some cases we may not have content (scroll position)
void
nsFrameManager::CaptureFrameStateFor(nsIFrame* aFrame,
                                     nsILayoutHistoryState* aState)

        }
        node = node->mNext;
      }
    }
  }
  delete aNode;
}


UndisplayedNode*
nsFrameManagerBase::UndisplayedMap::UnlinkNodesFor(nsIContent* aParentContent)
{
  PLHashEntry** entry = GetEntryFor(&aParentContent);
  NS_ASSERTION(entry, "content not in map");
  if (*entry) {
    UndisplayedNode* node = (UndisplayedNode*)((*entry)->value);
    NS_ASSERTION(node, "null node for non-null entry in UndisplayedMap");
    delete node;
    PL_HashTableRawRemove(mTable, entry, *entry);
    mLastLookup = nullptr; // hashtable may have shifted bucket out from under us
    return node;
  }
  return nullptr;
}

void
nsFrameManagerBase::UndisplayedMap::RemoveNodesFor(nsIContent* aParentContent)
{
  delete UnlinkNodesFor(aParentContent);
}

static int
RemoveUndisplayedEntry(PLHashEntry* he, int i, void* arg)
{
  UndisplayedNode*  node = (UndisplayedNode*)(he->value);
  delete node;
  // Remove and free this entry and continue enumerating





  NS_HIDDEN_(void) SetUndisplayedContent(nsIContent* aContent,
                                         nsStyleContext* aStyleContext);
  NS_HIDDEN_(void) ChangeUndisplayedContent(nsIContent* aContent,
                                            nsStyleContext* aStyleContext);
  NS_HIDDEN_(void) ClearUndisplayedContentIn(nsIContent* aContent,
                                             nsIContent* aParentContent);
  NS_HIDDEN_(void) ClearAllUndisplayedContentIn(nsIContent* aParentContent);

  // Mapping display:contents content
  NS_HIDDEN_(nsStyleContext*) GetDisplayContents(nsIContent* aContent);
  NS_HIDDEN_(mozilla::UndisplayedNode*)
    GetAllDisplayContentsIn(nsIContent* aParentContent);
  NS_HIDDEN_(void) SetDisplayContents(nsIContent* aContent,
                                         nsStyleContext* aStyleContext);
  NS_HIDDEN_(void) ChangeDisplayContents(nsIContent* aContent,
                                            nsStyleContext* aStyleContext);
  NS_HIDDEN_(void) ClearDisplayContentsIn(nsIContent* aContent,
                                             nsIContent* aParentContent);
  NS_HIDDEN_(void) ClearAllDisplayContentsIn(nsIContent* aParentContent);

  // Functions for manipulating the frame model
  NS_HIDDEN_(nsresult) AppendFrames(nsIFrame*       aParentFrame,
                                    ChildListID     aListID,
                                    nsFrameList&    aFrameList);

  NS_HIDDEN_(nsresult) InsertFrames(nsIFrame*       aParentFrame,
                                    ChildListID     aListID,
                                    nsIFrame*       aPrevFrame,






  // weak link, because the pres shell owns us
  nsIPresShell*                   mPresShell;
  // the pres shell owns the style set
  nsStyleSet*                     mStyleSet;
  nsIFrame*                       mRootFrame;
  PLDHashTable                    mPlaceholderMap;
  UndisplayedMap*                 mUndisplayedMap;
  UndisplayedMap*                 mDisplayContentsMap;
  bool                            mIsDestroyingFrames;  // The frame manager is destroying some frame(s).

  // The frame tree generation number
  // We use this to avoid unnecessary screenshotting
  // on Android. Unfortunately, this is static to match
  // the single consumer which is also static. Keeping
  // this the same greatly simplifies lifetime issues and
  // makes sure we always using the correct number.

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