gecko/layout/xul/base/src/nsDocElementBoxFrame.cpp

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#include "nsHTMLParts.h"
#include "nsContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsIDocument.h"
#include "nsPageFrame.h"
#include "nsIRenderingContext.h"
#include "nsGUIEvent.h"
#include "nsIDOMEvent.h"
#include "nsStyleConsts.h"
#include "nsGkAtoms.h"
#include "nsIEventStateManager.h"
#include "nsIDeviceContext.h"
#include "nsIPresShell.h"
#include "nsBoxFrame.h"
#include "nsStackLayout.h"
#include "nsIAnonymousContentCreator.h"
#include "nsINodeInfo.h"
#include "nsIServiceManager.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"

//#define DEBUG_REFLOW

class nsDocElementBoxFrame : public nsBoxFrame,
                             public nsIAnonymousContentCreator
{
public:
  virtual void DestroyFrom(nsIFrame* aDestructRoot);

  friend nsIFrame* NS_NewBoxFrame(nsIPresShell* aPresShell,
                                  nsStyleContext* aContext);

  nsDocElementBoxFrame(nsIPresShell* aShell, nsStyleContext* aContext)
    :nsBoxFrame(aShell, aContext, PR_TRUE) {}

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  // nsIAnonymousContentCreator
  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
  virtual void AppendAnonymousContentTo(nsBaseContentList& aElements);

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const
  {
    // Override nsBoxFrame.
    if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
      return PR_FALSE;
    return nsBoxFrame::IsFrameOfType(aFlags);
  }

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
private:
  nsCOMPtr<nsIContent> mPopupgroupContent;
  nsCOMPtr<nsIContent> mTooltipContent;
};

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

nsIFrame*
NS_NewDocElementBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsDocElementBoxFrame (aPresShell, aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsDocElementBoxFrame)

void
nsDocElementBoxFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
  nsContentUtils::DestroyAnonymousContent(&mPopupgroupContent);
  nsContentUtils::DestroyAnonymousContent(&mTooltipContent);
  nsBoxFrame::DestroyFrom(aDestructRoot);
}

nsresult
nsDocElementBoxFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
{
  nsIDocument* doc = mContent->GetDocument();
  if (!doc) {
    // The page is currently being torn down.  Why bother.
    return NS_ERROR_FAILURE;
  }
  nsNodeInfoManager *nodeInfoManager = doc->NodeInfoManager();

  // create the top-secret popupgroup node. shhhhh!
  nsCOMPtr<nsINodeInfo> nodeInfo;
  nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::popupgroup,
                                          nsnull, kNameSpaceID_XUL);
  NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);

  nsresult rv = NS_NewXULElement(getter_AddRefs(mPopupgroupContent), nodeInfo);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!aElements.AppendElement(mPopupgroupContent))
    return NS_ERROR_OUT_OF_MEMORY;

  // create the top-secret default tooltip node. shhhhh!
  nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::tooltip, nsnull,
                                          kNameSpaceID_XUL);
  NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);

  rv = NS_NewXULElement(getter_AddRefs(mTooltipContent), nodeInfo);
  NS_ENSURE_SUCCESS(rv, rv);

  mTooltipContent->SetAttr(nsnull, nsGkAtoms::_default,
                           NS_LITERAL_STRING("true"), PR_FALSE);

  if (!aElements.AppendElement(mTooltipContent))
    return NS_ERROR_OUT_OF_MEMORY;

  return NS_OK;
}

void
nsDocElementBoxFrame::AppendAnonymousContentTo(nsBaseContentList& aElements)
{
  aElements.MaybeAppendElement(mPopupgroupContent);
  aElements.MaybeAppendElement(mTooltipContent);
}

NS_QUERYFRAME_HEAD(nsDocElementBoxFrame)
  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)

#ifdef DEBUG
NS_IMETHODIMP
nsDocElementBoxFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("DocElementBox"), aResult);
}
#endif