pjs/layout/style/nsStyleContext.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsString.h"
#include "nsUnitConversion.h"
#include "nsIContent.h"
#include "nsIPresContext.h"
#include "nsIStyleRule.h"
#include "nsISupportsArray.h"
#include "nsCRT.h"

#include "nsIFrame.h"


#ifdef NS_DEBUG
static PRBool gsDebug = PR_FALSE;
#else
static const PRBool gsDebug = PR_FALSE;
#endif


static NS_DEFINE_IID(kStyleFontSID, NS_STYLEFONT_SID);
static NS_DEFINE_IID(kStyleColorSID, NS_STYLECOLOR_SID);
static NS_DEFINE_IID(kStyleListSID, NS_STYLELIST_SID);
static NS_DEFINE_IID(kStyleMoleculeSID, NS_STYLEMOLECULE_SID);

static NS_DEFINE_IID(kIStyleContextIID, NS_ISTYLECONTEXT_IID);

nsStyleFont::nsStyleFont(const nsFont& aFont)
  : mFont(aFont)
{
}

nsStyleFont::~nsStyleFont(void)
{
}

struct StyleFontImpl : public nsStyleFont {
  StyleFontImpl(const nsFont& aFont)
    : nsStyleFont(aFont)
  {}
  ~StyleFontImpl()  
  {}

  virtual const nsID& GetID(void)
  { return kStyleFontSID; }

  virtual void InheritFrom(const nsStyleFont& aCopy);

private:  // These are not allowed
  StyleFontImpl(const StyleFontImpl& aOther);
  StyleFontImpl& operator=(const StyleFontImpl& aOther);
};

void StyleFontImpl::InheritFrom(const nsStyleFont& aCopy)
{
  mFont = aCopy.mFont;
  mThreeD = aCopy.mThreeD;
}

struct StyleColorImpl: public nsStyleColor {
  StyleColorImpl(void)
  {
    mBackgroundAttachment = NS_STYLE_BG_ATTACHMENT_SCROLL;
    mBackgroundFlags = NS_STYLE_BG_COLOR_TRANSPARENT;
    mBackgroundRepeat = NS_STYLE_BG_REPEAT_OFF;

    mBackgroundColor = NS_RGB(192,192,192);
  }

  ~StyleColorImpl(void)
  {}

  virtual const nsID& GetID(void)
  { return kStyleColorSID;  }

  virtual void InheritFrom(const nsStyleColor& aCopy);

private:  // These are not allowed
  StyleColorImpl(const StyleColorImpl& aOther);
  StyleColorImpl& operator=(const StyleColorImpl& aOther);
};

void StyleColorImpl::InheritFrom(const nsStyleColor& aCopy)
{
  mColor  = aCopy.mColor;

  mBackgroundFlags = NS_STYLE_BG_COLOR_TRANSPARENT;
}


struct StyleListImpl: public nsStyleList {
  StyleListImpl(void)
  {
    mListStyleType = NS_STYLE_LIST_STYLE_BASIC;
    mListStylePosition = NS_STYLE_LIST_STYLE_POSITION_OUTSIDE;
  }

  ~StyleListImpl(void)
  {
  }

  virtual const nsID& GetID(void)
  { return kStyleListSID; }

  virtual void InheritFrom(const nsStyleList& aCopy);
};

void StyleListImpl::InheritFrom(const nsStyleList& aCopy)
{
  mListStyleType = aCopy.mListStyleType;
  mListStyleImage = aCopy.mListStyleImage;
  mListStylePosition = aCopy.mListStylePosition;
}

nsStyleMolecule::nsStyleMolecule()
{
}

nsStyleMolecule::~nsStyleMolecule()
{
}

struct StyleMoleculeImpl : public nsStyleMolecule {
  StyleMoleculeImpl(void)
  {}
  ~StyleMoleculeImpl(void)
  {}

  virtual const nsID& GetID(void)
  { return kStyleMoleculeSID;  }

  virtual void InheritFrom(const nsStyleMolecule& aCopy);

private:  // These are not allowed
  StyleMoleculeImpl(const StyleMoleculeImpl& aOther);
  StyleMoleculeImpl& operator=(const StyleMoleculeImpl& aOther);
};

void StyleMoleculeImpl::InheritFrom(const nsStyleMolecule& aCopy)
{
  cursor            = aCopy.cursor;
  direction         = aCopy.direction;

  textDecoration    = aCopy.textDecoration;

  textAlign         = aCopy.textAlign;
  whiteSpace        = aCopy.whiteSpace;

//  lineHeight        = aCopy.lineHeight;
}


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

class StyleContextImpl : public nsIStyleContext {
public:
  StyleContextImpl(nsIStyleContext* aParent, nsISupportsArray* aRules, nsIPresContext* aPresContext);
  ~StyleContextImpl();

  void* operator new(size_t sz) {
    void* rv = new char[sz];
    nsCRT::zero(rv, sz);
    return rv;
  }

  NS_DECL_ISUPPORTS

  virtual nsIStyleContext*  GetParent(void) const;
  virtual nsISupportsArray* GetStyleRules(void) const;

  virtual PRBool    Equals(const nsIStyleContext* aOther) const;
  virtual PRUint32  HashValue(void) const;

  virtual nsStyleStruct* GetData(const nsIID& aSID);

  virtual void InheritFrom(const StyleContextImpl& aParent);

  virtual void HackStyleFor(nsIPresContext* aPresContext,
                            nsIContent* aContent,
                            nsIFrame* aFrame);

  nsIStyleContext*  mParent;
  PRUint32          mHashValid: 1;
  PRUint32          mHashValue: 31;
  nsISupportsArray* mRules;

  // the style data...
  StyleFontImpl     mFont;
  StyleColorImpl    mColor;
  StyleListImpl     mList;
// xxx backward support hack
  StyleMoleculeImpl mMolecule;
};

StyleContextImpl::StyleContextImpl(nsIStyleContext* aParent, nsISupportsArray* aRules, 
                                   nsIPresContext* aPresContext)
  : mParent(aParent), // weak ref
    mRules(aRules),
    mFont(aPresContext->GetDefaultFont()),
    mColor(),
    mList(),
    mMolecule()
{
  NS_INIT_REFCNT();
  NS_IF_ADDREF(mRules);

  if (nsnull != aParent) {
    InheritFrom((StyleContextImpl&)*aParent);
  }

  if (nsnull != mRules) {
    PRInt32 index = mRules->Count();
    while (0 < index) {
      nsIStyleRule* rule = (nsIStyleRule*)mRules->ElementAt(--index);
      rule->MapStyleInto(this, aPresContext);
      NS_RELEASE(rule);
    }
  }
}

StyleContextImpl::~StyleContextImpl()
{
  mParent = nsnull; // weak ref
  NS_IF_RELEASE(mRules);
}

NS_IMPL_ISUPPORTS(StyleContextImpl, kIStyleContextIID)

nsIStyleContext* StyleContextImpl::GetParent(void) const
{
  NS_IF_ADDREF(mParent);
  return mParent;
}

nsISupportsArray* StyleContextImpl::GetStyleRules(void) const
{
  NS_IF_ADDREF(mRules);
  return mRules;
}


PRBool StyleContextImpl::Equals(const nsIStyleContext* aOther) const
{
  PRBool  result = PR_TRUE;
  const StyleContextImpl* other = (StyleContextImpl*)aOther;

  if (other != this) {
    if (mParent != other->mParent) {
      result = PR_FALSE;
    }
    else {
      if ((nsnull != mRules) && (nsnull != other->mRules)) {
        result = mRules->Equals(other->mRules);
      }
      else {
        result = PRBool((nsnull == mRules) && (nsnull == other->mRules));
      }
    }
  }
  return result;
}

PRUint32 StyleContextImpl::HashValue(void) const
{
  if (0 == mHashValid) {
    ((StyleContextImpl*)this)->mHashValue = ((nsnull != mParent) ? mParent->HashValue() : 0);
    if (nsnull != mRules) {
      PRInt32 index = mRules->Count();
      while (0 <= --index) {
        nsIStyleRule* rule = (nsIStyleRule*)mRules->ElementAt(index);
        PRUint32 hash = rule->HashValue();
        ((StyleContextImpl*)this)->mHashValue ^= (hash & 0x7FFFFFFF);
        NS_RELEASE(rule);
      }
    }
    ((StyleContextImpl*)this)->mHashValid = 1;
  }
  return mHashValue;
}


nsStyleStruct* StyleContextImpl::GetData(const nsIID& aSID)
{
  if (aSID.Equals(kStyleFontSID)) {
    return &mFont;
  }
  if (aSID.Equals(kStyleColorSID)) {
    return &mColor;
  }
  if (aSID.Equals(kStyleListSID)) {
    return &mList;
  }
  if (aSID.Equals(kStyleMoleculeSID)) {
    return &mMolecule;
  }
  return nsnull;
}

void StyleContextImpl::InheritFrom(const StyleContextImpl& aParent)
{
  mFont.InheritFrom(aParent.mFont);
  mColor.InheritFrom(aParent.mColor);
  mList.InheritFrom(aParent.mList);
  mMolecule.InheritFrom(aParent.mMolecule);
}

void StyleContextImpl::HackStyleFor(nsIPresContext* aPresContext,
                                    nsIContent* aContent,
                                    nsIFrame* aParentFrame)
{
/*
  mColor.mColor = NS_RGB(0, 0, 0);
*/

  mMolecule.display = NS_STYLE_DISPLAY_BLOCK;
  mMolecule.whiteSpace = NS_STYLE_WHITESPACE_NORMAL;
  mMolecule.verticalAlign = NS_STYLE_VERTICAL_ALIGN_BASELINE;
  mMolecule.textAlign = NS_STYLE_TEXT_ALIGN_LEFT;

  mMolecule.positionFlags = NS_STYLE_POSITION_STATIC;
  mMolecule.floats = 0;

  // XXX If it's a B guy then make it inline
  nsIAtom* tag = aContent->GetTag();
  nsAutoString buf;
  if (tag != nsnull) {
    tag->ToString(buf);
    NS_RELEASE(tag);
    if (buf.EqualsIgnoreCase("B")) {
//      float p2t = aPresContext->GetPixelsToTwips();
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
//      mColor.mBackgroundColor = NS_RGB(128, 128, 255);
//      mColor.mBackgroundFlags = 0;
//      mMolecule.border.top = nscoord(5 * p2t);
//      mMolecule.border.right = nscoord(5 * p2t);
//      mMolecule.border.bottom = nscoord(5 * p2t);
//      mMolecule.border.left = nscoord(5 * p2t);
//      for (int i = 0; i < 4; i++) {
//        mMolecule.borderStyle[i] = NS_STYLE_BORDER_STYLE_INSET;
//        mMolecule.borderColor[i] = NS_RGB(128, 128, 128);
//      }
    } else if (buf.EqualsIgnoreCase("A")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
      mMolecule.cursor = NS_STYLE_CURSOR_HAND;
    } else if (buf.EqualsIgnoreCase("BR")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
      nsString  align("CLEAR");
      nsString  value;
      if (eContentAttr_HasValue == aContent->GetAttribute(align, value)) {
        if (0 == value.Compare("left", PR_TRUE)) {
          mMolecule.clear = NS_STYLE_CLEAR_LEFT;
        } else if (0 == value.Compare("right", PR_TRUE)) {
          mMolecule.clear = NS_STYLE_CLEAR_RIGHT;
        } else if (0 == value.Compare("all", PR_TRUE)) {
          mMolecule.clear = NS_STYLE_CLEAR_BOTH;
        }
      }
    } else if (buf.EqualsIgnoreCase("SPACER")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("WBR")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("INPUT")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("I")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("S")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("PRE")) {
      mMolecule.whiteSpace = NS_STYLE_WHITESPACE_PRE;
      mMolecule.margin.top = NS_POINTS_TO_TWIPS_INT(3);
      mMolecule.margin.bottom = NS_POINTS_TO_TWIPS_INT(3);
//      mColor.mBackgroundImage = "resource:/res/gear1.gif";
//      mColor.mBackgroundRepeat = NS_STYLE_BG_REPEAT_XY;
    } else if (buf.EqualsIgnoreCase("U")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("FONT")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    } else if (buf.EqualsIgnoreCase("THREED")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
      mFont.mThreeD = 1;
    } else if (buf.EqualsIgnoreCase("TT")) {
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
//      mFont.mFont.name.SetLength(0);
//      mFont.mFont.name.Append("Courier");
//      mMolecule.positionFlags = NS_STYLE_POSITION_RELATIVE;
//      mMolecule.left = -50;
//      mMolecule.top = -50;
    } else if (buf.EqualsIgnoreCase("IMG")) {
      float p2t = aPresContext->GetPixelsToTwips();
      mMolecule.display = NS_STYLE_DISPLAY_INLINE;
      mMolecule.padding.top = nscoord(2 * p2t);
      mMolecule.padding.right = nscoord(2 * p2t);
      mMolecule.padding.bottom = nscoord(2 * p2t);
      mMolecule.padding.left = nscoord(2 * p2t);
      nsString  align("ALIGN");
      nsString  value;
      if (eContentAttr_HasValue == aContent->GetAttribute(align, value)) {
        if (0 == value.Compare("left", PR_TRUE)) {
          mMolecule.floats = NS_STYLE_FLOAT_LEFT;
        } else if (0 == value.Compare("right", PR_TRUE)) {
          mMolecule.floats = NS_STYLE_FLOAT_RIGHT;
        }
      }
    } else if (buf.EqualsIgnoreCase("P")) {
      // mMolecule.textAlign = NS_STYLE_TEXT_ALIGN_CENTER;
      mMolecule.margin.top = NS_POINTS_TO_TWIPS_INT(2);
      mMolecule.margin.bottom = NS_POINTS_TO_TWIPS_INT(2);
    } else if (buf.EqualsIgnoreCase("BODY")) {
      float p2t = aPresContext->GetPixelsToTwips();
//      mColor.mBackgroundColor = NS_RGB(255, 255, 255);
//      mColor.mBackgroundFlags = 0;
      //mColor.mBackgroundFlags = 0;
      //mColor.mBackgroundImage = "resource:/res/rock_gra.gif";
      //mColor.mBackgroundRepeat = NS_STYLE_BG_REPEAT_XY;
      mMolecule.padding.top = nscoord(5 * p2t);
      mMolecule.padding.right = nscoord(5 * p2t);
      mMolecule.padding.bottom = nscoord(5 * p2t);
      mMolecule.padding.left = nscoord(5 * p2t);
      mMolecule.border.top = nscoord(1 * p2t);
      mMolecule.border.right = nscoord(1 * p2t);
      mMolecule.border.bottom = nscoord(1 * p2t);
      mMolecule.border.left = nscoord(1 * p2t);
      for (int i = 0; i < 4; i++) {
        mMolecule.borderStyle[i] = NS_STYLE_BORDER_STYLE_SOLID;
        mMolecule.borderColor[i] = NS_RGB(0, 255, 0);
      }
    } else if (buf.EqualsIgnoreCase("LI")) {
      mMolecule.display = NS_STYLE_DISPLAY_LIST_ITEM;
    } else if (buf.EqualsIgnoreCase("UL") || buf.EqualsIgnoreCase("OL")) {
      float p2t = aPresContext->GetPixelsToTwips();
      mMolecule.padding.left = nscoord(40 * p2t);
      mMolecule.margin.top = NS_POINTS_TO_TWIPS_INT(5);
      mMolecule.margin.bottom = NS_POINTS_TO_TWIPS_INT(5);
    } else if (buf.EqualsIgnoreCase("TABLE")) {                     // TABLE
      mMolecule.border.top = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.border.bottom = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.border.right = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.border.left = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.borderStyle[0] = mMolecule.borderStyle[1] =
      mMolecule.borderStyle[2] = mMolecule.borderStyle[3] = NS_STYLE_BORDER_STYLE_SOLID;
      mMolecule.fixedWidth = -1;
      mMolecule.proportionalWidth = 100;
      nsString  align("ALIGN");
      nsString  value;
      if (eContentAttr_HasValue == aContent->GetAttribute(align, value)) {
        if (0 == value.Compare("left", PR_TRUE)) {
          mMolecule.floats = NS_STYLE_FLOAT_LEFT;
        } else if (0 == value.Compare("right", PR_TRUE)) {
          mMolecule.floats = NS_STYLE_FLOAT_RIGHT;
        }
      }
    } else if (buf.EqualsIgnoreCase("CAPTION")) {                   // CAPTION
      mMolecule.verticalAlign = NS_STYLE_VERTICAL_ALIGN_TOP;
    } else if (buf.EqualsIgnoreCase("TBODY")) {                     // TBODY
      mMolecule.padding.top = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.bottom = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.right = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.left = NS_POINTS_TO_TWIPS_INT(1);
    } else if (buf.EqualsIgnoreCase("TR")) {                        // TROW
      mMolecule.padding.top = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.bottom = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.right = NS_POINTS_TO_TWIPS_INT(1);
      mMolecule.padding.left = NS_POINTS_TO_TWIPS_INT(1);
    } else if (buf.EqualsIgnoreCase("TD")) {                        // TD
      float p2t = aPresContext->GetPixelsToTwips();
      
      
      // Set padding to twenty for testing purposes
      int cellPadding = 1;
      if (gsDebug==PR_TRUE)
        cellPadding = 20;
      mMolecule.verticalAlign = NS_STYLE_VERTICAL_ALIGN_MIDDLE;
        
      mMolecule.padding.top = NS_POINTS_TO_TWIPS_INT(cellPadding);
      mMolecule.padding.bottom = NS_POINTS_TO_TWIPS_INT(cellPadding);
      mMolecule.padding.right = NS_POINTS_TO_TWIPS_INT(cellPadding);
      mMolecule.padding.left = NS_POINTS_TO_TWIPS_INT(cellPadding);
//      mColor.mBackgroundColor = NS_RGB(255, 255, 0);
//      mColor.mBackgroundFlags = 0;
      mMolecule.border.top = nscoord(1 * p2t);
      mMolecule.border.right = nscoord(1 * p2t);
      mMolecule.border.bottom = nscoord(1 * p2t);
      mMolecule.border.left = nscoord(1 * p2t);
      for (int i = 0; i < 4; i++) {
        mMolecule.borderStyle[i] = NS_STYLE_BORDER_STYLE_SOLID;
        mMolecule.borderColor[i] = NS_RGB(128, 128, 128);
      }
      mMolecule.fixedWidth = -1;
      mMolecule.proportionalWidth = -1;
      mMolecule.fixedHeight = -1;
      mMolecule.proportionalHeight = -1;

    } else if (buf.EqualsIgnoreCase("COL")) {
      mMolecule.fixedWidth = -1;
      mMolecule.proportionalWidth = -1;
      mMolecule.fixedHeight = -1;
      mMolecule.proportionalHeight = -1;
    }
  } else {
    // It's text (!)
    mMolecule.display = NS_STYLE_DISPLAY_INLINE;
    mMolecule.cursor = NS_STYLE_CURSOR_IBEAM;
    nsIContent* content = aParentFrame->GetContent();
    nsIAtom* parentTag = content->GetTag();
    parentTag->ToString(buf);
    NS_RELEASE(content);
    NS_RELEASE(parentTag);
    if (buf.EqualsIgnoreCase("B")) {
//      mFont.mFont.size = NS_POINTS_TO_TWIPS_INT(18);
//      mFont.mFont.weight = NS_FONT_WEIGHT_BOLD;
    } else if (buf.EqualsIgnoreCase("A")) {
//      mColor.mColor = NS_RGB(0,0,255);
//      mFont.mFont.decorations = NS_FONT_DECORATION_UNDERLINE;
      // This simulates a <PRE><A>text inheritance rule
      // Check the parent of the A
      nsIFrame* parentParentFrame = aParentFrame->GetGeometricParent();
      if (nsnull != parentParentFrame) {
        nsIContent* parentParentContent = parentParentFrame->GetContent();
        nsIAtom* parentParentTag = parentParentContent->GetTag();
        parentParentTag->ToString(buf);
        NS_RELEASE(parentParentTag);
        NS_RELEASE(parentParentContent);
        if (buf.EqualsIgnoreCase("PRE")) {
          mMolecule.whiteSpace = NS_STYLE_WHITESPACE_PRE;
//          mFont.mFont.name.SetLength(0);
//          mFont.mFont.name.Append("Courier");
        }
      }
    } else if (buf.EqualsIgnoreCase("THREED")) {
//      mFont.mFont.size = NS_POINTS_TO_TWIPS_INT(18);
//      mFont.mFont.weight = NS_FONT_WEIGHT_BOLD;
      mFont.mThreeD = 1;
    } else if (buf.EqualsIgnoreCase("I")) {
//      mFont.mFont.style = NS_FONT_STYLE_ITALIC;
    } else if (buf.EqualsIgnoreCase("BLINK")) {
//      mFont.mFont.decorations |= NS_STYLE_TEXT_DECORATION_BLINK;
    } else if (buf.EqualsIgnoreCase("TT")) {
//      mFont.mFont.name.SetLength(0);
//      mFont.mFont.name.Append("Courier");
    } else if (buf.EqualsIgnoreCase("S")) {
//      mFont.mFont.decorations = NS_FONT_DECORATION_LINE_THROUGH;
    } else if (buf.EqualsIgnoreCase("U")) {
//      mFont.mFont.decorations = NS_FONT_DECORATION_UNDERLINE;
    } else if (buf.EqualsIgnoreCase("PRE")) {
      mMolecule.whiteSpace = NS_STYLE_WHITESPACE_PRE;
//      mFont.mFont.name.SetLength(0);
//      mFont.mFont.name.Append("Courier");
    }
  }

#if 0
  if ((NS_STYLE_DISPLAY_BLOCK == mMolecule.display) ||
      (NS_STYLE_DISPLAY_LIST_ITEM == mMolecule.display)) {
    // Always justify text (take that ie)
    mMolecule.textAlign = NS_STYLE_TEXT_ALIGN_JUSTIFY;
  }
#endif

  mMolecule.borderPadding.top =
    mMolecule.border.top + mMolecule.padding.top;
  mMolecule.borderPadding.right =
    mMolecule.border.right + mMolecule.padding.right;
  mMolecule.borderPadding.bottom =
    mMolecule.border.bottom + mMolecule.padding.bottom;
  mMolecule.borderPadding.left =
    mMolecule.border.left + mMolecule.padding.left;

}

NS_LAYOUT nsresult
NS_NewStyleContext(nsIStyleContext** aInstancePtrResult,
                   nsISupportsArray* aRules,
                   nsIPresContext* aPresContext,
                   nsIContent* aContent,
                   nsIFrame* aParentFrame)
{
  NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }

  nsIStyleContext* parent = nsnull;
  if (nsnull != aParentFrame) {
    parent = aParentFrame->GetStyleContext(aPresContext);
    NS_ASSERTION(nsnull != parent, "parent frame must have style context");
  }

  StyleContextImpl* context = new StyleContextImpl(parent, aRules, aPresContext);
  NS_IF_RELEASE(parent);
  if (nsnull == context) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  context->HackStyleFor(aPresContext, aContent, aParentFrame);

  return context->QueryInterface(kIStyleContextIID, (void **) aInstancePtrResult);
}