gecko-dev/content/base/src/nsDOMAttribute.h

/* -*- 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 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */
#ifndef nsDOMAttribute_h___
#define nsDOMAttribute_h___

#include "nsIDOMAttr.h"
#include "nsIDOMText.h"
#include "nsIDOMNodeList.h"
#include "nsIScriptObjectOwner.h"
#include "nsGenericDOMNodeList.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsINodeInfo.h"

class nsIContent;
class nsDOMAttribute;

#define NS_IDOMATTRIBUTEPRIVATE_IID  \
 {0xa6cf90dd, 0x15b3, 0x11d2,        \
 {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}

class nsIDOMAttributePrivate : public nsISupports {
public:
  NS_IMETHOD DropReference() = 0;
  NS_IMETHOD SetContent(nsIContent* aContent) = 0;
  NS_IMETHOD GetContent(nsIContent** aContent) = 0;
};

// bogus child list for an attribute
class nsAttributeChildList : public nsGenericDOMNodeList
{
public:
  nsAttributeChildList(nsDOMAttribute* aAttribute);
  virtual ~nsAttributeChildList();

  // interface nsIDOMNodeList
  NS_IMETHOD    GetLength(PRUint32* aLength);
  NS_IMETHOD    Item(PRUint32 aIndex, nsIDOMNode** aReturn);

  void DropReference();

protected:
  nsDOMAttribute* mAttribute;
};

// Attribute helper class used to wrap up an attribute with a dom
// object that implements nsIDOMAttr and nsIDOMNode and
// nsIScriptObjectOwner
class nsDOMAttribute : public nsIDOMAttr, 
                       public nsIScriptObjectOwner, 
                       public nsIDOMAttributePrivate
{
public:
  nsDOMAttribute(nsIContent* aContent, nsINodeInfo *aNodeInfo,
                 const nsAReadableString& aValue);
  virtual ~nsDOMAttribute();

  NS_DECL_ISUPPORTS

  NS_IMETHOD GetScriptObject(nsIScriptContext* aContext, void** aScriptObject);
  NS_IMETHOD SetScriptObject(void *aScriptObject);

  // nsIDOMAttr interface
  NS_DECL_IDOMATTR
 
  // nsIDOMNode interface
  NS_DECL_IDOMNODE

  // nsIDOMAttributePrivate interface
  NS_IMETHOD DropReference();
  NS_IMETHOD SetContent(nsIContent* aContent);
  NS_IMETHOD GetContent(nsIContent** aContent);

private:
  nsIContent* mContent;
  nsCOMPtr<nsINodeInfo> mNodeInfo;
  nsString mValue;
  // XXX For now, there's only a single child - a text
  // element representing the value
  nsIDOMText* mChild;
  nsAttributeChildList* mChildList;
  void* mScriptObject;
};


#endif /* nsDOMAttribute_h___ */