gecko/editor/libeditor/base/ChangeCSSInlineStyleTxn.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef ChangeCSSInlineStyleTxn_h__
#define ChangeCSSInlineStyleTxn_h__
#include "EditTxn.h"
#include "nsCOMPtr.h"
#include "nsIDOMElement.h"
#include "nsIEditor.h"
/**
* 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:
/** 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 nsAString & 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 nsAString & aValueList, const nsAString & 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(nsAString & aValues, const nsAString & aNewValue);
ChangeCSSInlineStyleTxn();
private:
/** 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(nsAString & aValues, const nsAString & aRemoveValue);
/** If the boolean is true and if the value is not the empty string,
* set the property in the transaction to that value; if the value
* is empty, remove the property from element's styles. If the boolean
* is false, just remove the style attribute.
*/
nsresult SetStyle(PRBool aAttributeWasSet, nsAString & aValue);
public:
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeCSSInlineStyleTxn, EditTxn)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_DECL_EDITTXN
NS_IMETHOD RedoTransaction();
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 property to for undo */
nsString mUndoValue;
/** the value to set the property to for redo */
nsString mRedoValue;
/** true if the style attribute was present and not empty before DoTransaction */
PRBool mUndoAttributeWasSet;
/** true if the style attribute is present and not empty after DoTransaction */
PRBool mRedoAttributeWasSet;
/** PR_TRUE if the operation is to remove mProperty from mElement */
PRBool mRemoveProperty;
};
#endif