diff -r 000000000000 -r 6474c204b198 editor/libeditor/base/ChangeCSSInlineStyleTxn.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/base/ChangeCSSInlineStyleTxn.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChangeCSSInlineStyleTxn_h__
+#define ChangeCSSInlineStyleTxn_h__
+
+#include "EditTxn.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsID.h"
+#include "nsIDOMElement.h"
+#include "nsString.h"
+#include "nscore.h"
+
+class nsIAtom;
+class nsIEditor;
+
+/**
+ * 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 true, remove aProperty from style attribute
+    */
+  NS_IMETHOD Init(nsIEditor      * aEditor,
+                  nsIDOMElement  * aElement,
+                  nsIAtom        * aProperty,
+                  const nsAString & aValue,
+                  bool 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 bool ValueIncludes(const nsAString & aValueList, const nsAString & aValue, bool 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
+    */
+  bool 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(bool 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==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 */
+  bool     mUndoAttributeWasSet;
+  /** true if the style attribute is present and not empty after DoTransaction */
+  bool     mRedoAttributeWasSet;
+
+  /** true if the operation is to remove mProperty from mElement */
+  bool     mRemoveProperty;
+};
+
+#endif