/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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
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 * 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.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Original Author: Daniel Glazman <glazman@netscape.com>
 *
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#ifndef ChangeCSSInlineStyleTxn_h__
#define ChangeCSSInlineStyleTxn_h__

#include "EditTxn.h"
#include "nsCOMPtr.h"
#include "nsIDOMElement.h"
#include "nsIEditor.h"

#define CHANGE_CSSINLINESTYLE_TXN_CID \
{/* a2185c9e-1dd1-11b2-88d6-d89704bf7a5a */ \
0xa2185c9e, 0x1dd1, 0x11b2, \
{0x88, 0xd6, 0xd8, 0x97, 0x04, 0xbf, 0x7a, 0x5a} }

/**
 * A transaction that changes the value of a CSS inline style of a content node. 
 * This transaction covers add, remove, and change a property's value.
 */
class ChangeCSSInlineStyleTxn : public EditTxn
{
public:

  static const nsIID& GetCID() { static nsIID iid = CHANGE_CSSINLINESTYLE_TXN_CID; return iid; }

  virtual ~ChangeCSSInlineStyleTxn();

  /** Initialize the transaction.
    * @param aEditor         [IN] the object providing core editing operations
    * @param aNode           [IN] the node whose style attribute will be changed
    * @param aProperty       [IN] the name of the property to change
    * @param aValue          [IN] the new value for aProperty, if aRemoveProperty is false
    * @param aRemoveProperty [IN] if PR_TRUE, remove aProperty from style attribute
    */
  NS_IMETHOD Init(nsIEditor      * aEditor,
                  nsIDOMElement  * aElement,
                  nsIAtom        * aProperty,
                  const nsAReadableString & aValue,
                  PRBool aRemoveProperty);

  /** returns true if the list of white-space separated values contains aValue
    *
    * @return                true if the value is in the list of values
    * @param aValueList      [IN] a list of white-space separated values
    * @param aValue          [IN] the value to look for in the list
    * @param aCaseSensitive  [IN] a boolean being true if a case-sensitive search is needed
    */
  static PRBool ValueIncludes(const nsAReadableString & aValueList, const nsAReadableString & aValue, PRBool aCaseSensitive);

  /** adds the value aNewValue to the list of white-space separated values aValues
    *
    * @param aValues         [IN/OUT] a list of wite-space separated values
    * @param aNewValue       [IN] a value this code adds to aValues if it is not already in
    */
  NS_IMETHOD AddValueToMultivalueProperty(nsAWritableString & aValues, const nsAReadableString  & aNewValue);

private:
  ChangeCSSInlineStyleTxn();

  /** returns true if the property accepts more than one value
    *
    * @return                true if the property accepts more than one value
    * @param aCSSProperty    [IN] the CSS property
    */
  PRBool AcceptsMoreThanOneValue(nsIAtom * aCSSProperty);

  /** remove a value from a list of white-space separated values
    * @param aValues         [IN] a list of white-space separated values
    * @param aRemoveValue    [IN] the value to remove from the list
    */
  void   RemoveValueFromListOfValues(nsAWritableString & aValues, const nsAReadableString  & aRemoveValue);

  /** appends 'property : value' to the string
    *
    * @param aOutputString   [IN/OUT] the string
    * @param aPropert        [IN] the css property string
    * @param aValues         [IN] the value string for the css property
    */
  void   AppendDeclaration(nsAWritableString & aOutputString,
                           nsAReadableString & aProperty,
                           nsAReadableString & aValues);

public:

  NS_IMETHOD DoTransaction(void);

  NS_IMETHOD UndoTransaction(void);

  NS_IMETHOD RedoTransaction(void);

  NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);

  NS_IMETHOD GetTxnDescription(nsAWritableString& aTxnDescription);

protected:

  /** the editor that created this transaction */
  nsIEditor *mEditor;
  
  /** the element to operate upon */
  nsCOMPtr<nsIDOMElement> mElement;
  
  /** the CSS property to change */
  nsIAtom *mProperty;

  /** the value to set the property to (ignored if mRemoveProperty==PR_TRUE) */
  nsString mValue;

  /** the value to set the attribute to for undo */
  nsString mUndoValue;
  PRBool   mUndoAttributeWasSet;
  /** the value to set the attribute to for redo */
  nsString mRedoValue;
  PRBool   mRedoAttributeWasSet;

  /** PR_TRUE if the mProperty was explicitely set on mElement at the time of execution */
  PRBool   mPropertyWasSet;

  /** PR_TRUE if the operation is to remove mProperty from mElement */
  PRBool   mRemoveProperty;

  friend class TransactionFactory;
};

#endif