gecko-dev/layout/generic/nsHTMLReflowCommand.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#include "nsCOMPtr.h"
#include "nsHTMLReflowCommand.h"
#include "nsHTMLParts.h"
#include "nsIFrame.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIContent.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsFrame.h"
#include "nsContainerFrame.h"
#include "nsLayoutAtoms.h"

nsresult
NS_NewHTMLReflowCommand(nsHTMLReflowCommand**           aInstancePtrResult,
                        nsIFrame*                       aTargetFrame,
                        nsReflowType                    aReflowType,
                        nsIFrame*                       aChildFrame,
                        nsIAtom*                        aAttribute)
{
  NS_ASSERTION(aInstancePtrResult,
               "null result passed to NS_NewHTMLReflowCommand");

  *aInstancePtrResult = new nsHTMLReflowCommand(aTargetFrame, aReflowType,
                                                aChildFrame, aAttribute);
  if (!*aInstancePtrResult) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return NS_OK;
}

#ifdef DEBUG_jesup
PRInt32 gReflows;
PRInt32 gReflowsInUse;
PRInt32 gReflowsInUseMax;
PRInt32 gReflowsZero;
PRInt32 gReflowsAuto;
PRInt32 gReflowsLarger;
PRInt32 gReflowsMaxZero;
PRInt32 gReflowsMaxAuto;
PRInt32 gReflowsMaxLarger;
class mPathStats {
public:
  mPathStats();
  ~mPathStats();
};
mPathStats::mPathStats()
{
}
mPathStats::~mPathStats()
{
  printf("nsHTMLReflowCommand->mPath stats:\n");
  printf("\tNumber created:   %d\n",gReflows);
  printf("\tNumber in-use:    %d\n",gReflowsInUseMax);

  printf("\tNumber size == 0: %d\n",gReflowsZero);
  printf("\tNumber size <= 8: %d\n",gReflowsAuto);
  printf("\tNumber size  > 8: %d\n",gReflowsLarger);
  printf("\tNum max size == 0: %d\n",gReflowsMaxZero);
  printf("\tNum max size <= 8: %d\n",gReflowsMaxAuto);
  printf("\tNum max size  > 8: %d\n",gReflowsMaxLarger);
}

// Just so constructor/destructor's get called
mPathStats gmPathStats;
#endif

// Construct a reflow command given a target frame, reflow command type,
// and optional child frame
nsHTMLReflowCommand::nsHTMLReflowCommand(nsIFrame*    aTargetFrame,
                                         nsReflowType aReflowType,
                                         nsIFrame*    aChildFrame,
                                         nsIAtom*     aAttribute)
  : mType(aReflowType), mTargetFrame(aTargetFrame), mChildFrame(aChildFrame),
    mAttribute(aAttribute),
    mListName(nsnull),
    mFlags(0)
{
  MOZ_COUNT_CTOR(nsHTMLReflowCommand);
  NS_PRECONDITION(mTargetFrame != nsnull, "null target frame");
  if (nsnull!=mAttribute)
    NS_ADDREF(mAttribute);
#ifdef DEBUG_jesup
  gReflows++;
  gReflowsInUse++;
  if (gReflowsInUse > gReflowsInUseMax)
    gReflowsInUseMax = gReflowsInUse;
#endif
}

nsHTMLReflowCommand::~nsHTMLReflowCommand()
{
  MOZ_COUNT_DTOR(nsHTMLReflowCommand);
#ifdef DEBUG_jesup
  if (mPath.GetArraySize() == 0)
    gReflowsMaxZero++;
  else if (mPath.GetArraySize() <= 8)
    gReflowsMaxAuto++;
  else
    gReflowsMaxLarger++;
  gReflowsInUse--;
#endif

  NS_IF_RELEASE(mAttribute);
  NS_IF_RELEASE(mListName);
}

nsresult
nsHTMLReflowCommand::GetTarget(nsIFrame*& aTargetFrame) const
{
  aTargetFrame = mTargetFrame;
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::SetTarget(nsIFrame* aTargetFrame)
{
  mTargetFrame = aTargetFrame;
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::GetType(nsReflowType& aReflowType) const
{
  aReflowType = mType;
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::GetAttribute(nsIAtom *& aAttribute) const
{
  aAttribute = mAttribute;
  if (nsnull!=aAttribute)
    NS_ADDREF(aAttribute);
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::GetChildFrame(nsIFrame*& aChildFrame) const
{
  aChildFrame = mChildFrame;
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::GetChildListName(nsIAtom*& aListName) const
{
  aListName = mListName;
  NS_IF_ADDREF(aListName);
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::SetChildListName(nsIAtom* aListName)
{
  mListName = aListName;
  NS_IF_ADDREF(mListName);
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::List(FILE* out) const
{
#ifdef DEBUG
  static const char* kReflowCommandType[] = {
    "ContentChanged",
    "StyleChanged",
    "ReflowDirty",
    "UserDefined",
  };

  fprintf(out, "ReflowCommand@%p[%s]:",
          this, kReflowCommandType[mType]);
  if (mTargetFrame) {
    fprintf(out, " target=");
    nsFrame::ListTag(out, mTargetFrame);
  }
  if (mChildFrame) {
    fprintf(out, " child=");
    nsFrame::ListTag(out, mChildFrame);
  }
  if (mAttribute) {
    fprintf(out, " attr=");
    nsAutoString attr;
    mAttribute->ToString(attr);
    fputs(NS_LossyConvertUCS2toASCII(attr).get(), out);
  }
  if (mListName) {
    fprintf(out, " list=");
    nsAutoString attr;
    mListName->ToString(attr);
    fputs(NS_LossyConvertUCS2toASCII(attr).get(), out);
  }
  fprintf(out, "\n");

  // Show the path, but without using mPath which is in an undefined
  // state at this point.
  if (mTargetFrame) {
    PRBool didOne = PR_FALSE;
    for (nsIFrame* f = mTargetFrame; nsnull != f; f->GetParent(&f)) {
      if (f != mTargetFrame) {
        fprintf(out, " ");
        nsFrame::ListTag(out, f);
        didOne = PR_TRUE;
      }
    }
    if (didOne) {
      fprintf(out, "\n");
    }
  }
#endif
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::GetFlags(PRInt32* aFlags)
{
  *aFlags = mFlags;
  return NS_OK;
}

nsresult
nsHTMLReflowCommand::SetFlags(PRInt32 aFlags)
{
  mFlags = aFlags;
  return NS_OK;
}