support for inserting text

editor/base/InsertTextTxn.cpp

@@ -0,0 +1,86 @@
+/* -*- 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 "InsertTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+InsertTextTxn::InsertTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             const nsString& aStringToInsert)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mStringToInsert = aStringToInsert;
+}
+
+nsresult InsertTextTxn::Do(void)
+{
+  return (mElement->InsertData(mOffset, mStringToInsert));
+}
+
+nsresult InsertTextTxn::Undo(void)
+{
+  PRUint32 length = mStringToInsert.Length();
+  return (mElement->DeleteData(mOffset, length));
+}
+
+nsresult InsertTextTxn::Redo(void)
+{
+  return Do();
+}
+
+nsresult InsertTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}

editor/base/InsertTextTxn.h

@@ -0,0 +1,71 @@
+/* -*- 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.
+ */
+
+#ifndef InsertTextTxn_h__
+#define InsertTextTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMCharacterData;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ * This transaction covers add, remove, and change attribute.
+ */
+class InsertTextTxn : public EditTxn
+{
+public:
+
+  InsertTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                const nsString& aStringToInsert);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(void);
+
+  virtual nsresult Redo(void);
+
+  virtual nsresult GetIsTransient(PRBool *aIsTransient);
+
+  virtual nsresult Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
+
+  virtual nsresult Write(nsIOutputStream *aOutputStream);
+
+  virtual nsresult GetUndoString(nsString **aString);
+
+  virtual nsresult GetRedoString(nsString **aString);
+
+protected:
+  
+  /** the text element to operate upon */
+  nsIDOMCharacterData *mElement;
+  
+  /** the offset into mElement where the insertion is to take place */
+  PRUint32 mOffset;
+
+  /** the value to set the attribute to (ignored if mRemoveAttribute==PR_TRUE) */
+  nsString mValue;
+
+  /** the text to insert into mElement at mOffset */
+  nsString mStringToInsert;
+
+};
+
+#endif

editor/base/editorInterfaces.cpp

@@ -19,10 +19,14 @@
 #include "nsString.h"
 #include "editor.h"
 #include "ChangeAttributeTxn.h"
+#include "InsertTextTxn.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMElement.h"
+#include "nsIDOMCharacterData.h"
 
 static NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
+static NS_DEFINE_IID(kIDOMCharacterDataIID, NS_IDOMCHARACTERDATA_IID);
+
  
 /*
  * nsEditorKeyListener implementation
@@ -129,15 +133,30 @@ nsEditorKeyListener::KeyDown(nsIDOMEvent* aKeyEvent)
         mEditor->Commit(ctrlKey);
         break;
       default:
-        // XXX Replace with x-platform NS-virtkeycode transform.
-        if (NS_OK == GetCharFromKeyCode(keyCode, isShift, & character)) {
-          nsString* key = new nsString();
-          *key += character;
-          if (!isShift) {
-            key->ToLowerCase();
+        {
+          // XXX Replace with x-platform NS-virtkeycode transform.
+          if (NS_OK == GetCharFromKeyCode(keyCode, isShift, & character)) {
+            nsString key;
+            key += character;
+            if (!isShift) {
+              key.ToLowerCase();
+            }
+
+            nsCOMPtr<nsIDOMNode> currentNode;
+            nsCOMPtr<nsIDOMNode> textNode;
+            nsCOMPtr<nsIDOMCharacterData> text;
+            if (NS_SUCCEEDED(mEditor->GetCurrentNode(getter_AddRefs(currentNode))) && 
+                NS_SUCCEEDED(mEditor->GetFirstTextNode(currentNode,getter_AddRefs(textNode))) && 
+                NS_SUCCEEDED(textNode->QueryInterface(kIDOMCharacterDataIID, getter_AddRefs(text)))) 
+            {
+              // XXX: for now, just append the text
+              PRUint32 offset;
+              text->GetLength(&offset);
+              InsertTextTxn *txn;
+              txn = new InsertTextTxn(mEditor, text, offset, key);
+              mEditor->ExecuteTransaction(txn);
+            }
           }
-          mEditor->InsertString(key);
-          delete key;
         }
         break;
       }
@@ -213,7 +232,11 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
           {
             if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
             {
-              ChangeAttributeTxn *txn = new ChangeAttributeTxn(mEditor, element, attribute, value);
+              ChangeAttributeTxn *txn;
+              if (PR_TRUE==ctrlKey)   // remove the attribute
+                txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_TRUE);
+              else                    // change the attribute
+               txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_FALSE);
               mEditor->ExecuteTransaction(txn);        
             }
           }
@@ -221,27 +244,6 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
         aProcessed=PR_TRUE;
         break;
 
-      case nsIDOMEvent::VK_SPACE:
-        {
-          //XXX: should be from a factory
-          //XXX: should manage the refcount of txn
-          nsString attribute("height");
-          nsString value("200");
-
-          nsString tableTag("TABLE");
-          nsCOMPtr<nsIDOMNode> currentNode;
-          nsCOMPtr<nsIDOMElement> element;
-          if (NS_SUCCEEDED(mEditor->GetFirstNodeOfType(nsnull, tableTag, getter_AddRefs(currentNode))))
-          {
-            if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
-            {
-              ChangeAttributeTxn *txn = new ChangeAttributeTxn(mEditor, element, attribute, value);
-              mEditor->ExecuteTransaction(txn);        
-            }
-          }
-        }
-        aProcessed=PR_TRUE;
-        break;
     }
   }
   return NS_OK;

editor/base/makefile.win

@@ -26,6 +26,7 @@ CPPSRCS =				\
       nsEditFactory.cpp \
       EditTxn.cpp \
       ChangeAttributeTxn.cpp \
+      InsertTextTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
@@ -34,6 +35,7 @@ CPP_OBJS =					\
 	.\$(OBJDIR)\editorInterfaces.obj		\
   .\$(OBJDIR)\EditTxn.obj \
   .\$(OBJDIR)\ChangeAttributeTxn.obj \
+  .\$(OBJDIR)\InsertTextTxn.obj \
 	$(NULL)
 
 MODULE=editor 

editor/core/InsertTextTxn.cpp

@@ -0,0 +1,86 @@
+/* -*- 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 "InsertTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+InsertTextTxn::InsertTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             const nsString& aStringToInsert)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mStringToInsert = aStringToInsert;
+}
+
+nsresult InsertTextTxn::Do(void)
+{
+  return (mElement->InsertData(mOffset, mStringToInsert));
+}
+
+nsresult InsertTextTxn::Undo(void)
+{
+  PRUint32 length = mStringToInsert.Length();
+  return (mElement->DeleteData(mOffset, length));
+}
+
+nsresult InsertTextTxn::Redo(void)
+{
+  return Do();
+}
+
+nsresult InsertTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}

editor/core/InsertTextTxn.h

@@ -0,0 +1,71 @@
+/* -*- 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.
+ */
+
+#ifndef InsertTextTxn_h__
+#define InsertTextTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMCharacterData;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ * This transaction covers add, remove, and change attribute.
+ */
+class InsertTextTxn : public EditTxn
+{
+public:
+
+  InsertTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                const nsString& aStringToInsert);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(void);
+
+  virtual nsresult Redo(void);
+
+  virtual nsresult GetIsTransient(PRBool *aIsTransient);
+
+  virtual nsresult Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
+
+  virtual nsresult Write(nsIOutputStream *aOutputStream);
+
+  virtual nsresult GetUndoString(nsString **aString);
+
+  virtual nsresult GetRedoString(nsString **aString);
+
+protected:
+  
+  /** the text element to operate upon */
+  nsIDOMCharacterData *mElement;
+  
+  /** the offset into mElement where the insertion is to take place */
+  PRUint32 mOffset;
+
+  /** the value to set the attribute to (ignored if mRemoveAttribute==PR_TRUE) */
+  nsString mValue;
+
+  /** the text to insert into mElement at mOffset */
+  nsString mStringToInsert;
+
+};
+
+#endif

editor/core/editorInterfaces.cpp

@@ -19,10 +19,14 @@
 #include "nsString.h"
 #include "editor.h"
 #include "ChangeAttributeTxn.h"
+#include "InsertTextTxn.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMElement.h"
+#include "nsIDOMCharacterData.h"
 
 static NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
+static NS_DEFINE_IID(kIDOMCharacterDataIID, NS_IDOMCHARACTERDATA_IID);
+
  
 /*
  * nsEditorKeyListener implementation
@@ -129,15 +133,30 @@ nsEditorKeyListener::KeyDown(nsIDOMEvent* aKeyEvent)
         mEditor->Commit(ctrlKey);
         break;
       default:
-        // XXX Replace with x-platform NS-virtkeycode transform.
-        if (NS_OK == GetCharFromKeyCode(keyCode, isShift, & character)) {
-          nsString* key = new nsString();
-          *key += character;
-          if (!isShift) {
-            key->ToLowerCase();
+        {
+          // XXX Replace with x-platform NS-virtkeycode transform.
+          if (NS_OK == GetCharFromKeyCode(keyCode, isShift, & character)) {
+            nsString key;
+            key += character;
+            if (!isShift) {
+              key.ToLowerCase();
+            }
+
+            nsCOMPtr<nsIDOMNode> currentNode;
+            nsCOMPtr<nsIDOMNode> textNode;
+            nsCOMPtr<nsIDOMCharacterData> text;
+            if (NS_SUCCEEDED(mEditor->GetCurrentNode(getter_AddRefs(currentNode))) && 
+                NS_SUCCEEDED(mEditor->GetFirstTextNode(currentNode,getter_AddRefs(textNode))) && 
+                NS_SUCCEEDED(textNode->QueryInterface(kIDOMCharacterDataIID, getter_AddRefs(text)))) 
+            {
+              // XXX: for now, just append the text
+              PRUint32 offset;
+              text->GetLength(&offset);
+              InsertTextTxn *txn;
+              txn = new InsertTextTxn(mEditor, text, offset, key);
+              mEditor->ExecuteTransaction(txn);
+            }
           }
-          mEditor->InsertString(key);
-          delete key;
         }
         break;
       }
@@ -213,7 +232,11 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
           {
             if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
             {
-              ChangeAttributeTxn *txn = new ChangeAttributeTxn(mEditor, element, attribute, value);
+              ChangeAttributeTxn *txn;
+              if (PR_TRUE==ctrlKey)   // remove the attribute
+                txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_TRUE);
+              else                    // change the attribute
+               txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_FALSE);
               mEditor->ExecuteTransaction(txn);        
             }
           }
@@ -221,27 +244,6 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
         aProcessed=PR_TRUE;
         break;
 
-      case nsIDOMEvent::VK_SPACE:
-        {
-          //XXX: should be from a factory
-          //XXX: should manage the refcount of txn
-          nsString attribute("height");
-          nsString value("200");
-
-          nsString tableTag("TABLE");
-          nsCOMPtr<nsIDOMNode> currentNode;
-          nsCOMPtr<nsIDOMElement> element;
-          if (NS_SUCCEEDED(mEditor->GetFirstNodeOfType(nsnull, tableTag, getter_AddRefs(currentNode))))
-          {
-            if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
-            {
-              ChangeAttributeTxn *txn = new ChangeAttributeTxn(mEditor, element, attribute, value);
-              mEditor->ExecuteTransaction(txn);        
-            }
-          }
-        }
-        aProcessed=PR_TRUE;
-        break;
     }
   }
   return NS_OK;

editor/core/makefile.win

@@ -26,6 +26,7 @@ CPPSRCS =				\
       nsEditFactory.cpp \
       EditTxn.cpp \
       ChangeAttributeTxn.cpp \
+      InsertTextTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
@@ -34,6 +35,7 @@ CPP_OBJS =					\
 	.\$(OBJDIR)\editorInterfaces.obj		\
   .\$(OBJDIR)\EditTxn.obj \
   .\$(OBJDIR)\ChangeAttributeTxn.obj \
+  .\$(OBJDIR)\InsertTextTxn.obj \
 	$(NULL)
 
 MODULE=editor 

editor/libeditor/base/InsertTextTxn.cpp

@@ -0,0 +1,86 @@
+/* -*- 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 "InsertTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+InsertTextTxn::InsertTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             const nsString& aStringToInsert)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mStringToInsert = aStringToInsert;
+}
+
+nsresult InsertTextTxn::Do(void)
+{
+  return (mElement->InsertData(mOffset, mStringToInsert));
+}
+
+nsresult InsertTextTxn::Undo(void)
+{
+  PRUint32 length = mStringToInsert.Length();
+  return (mElement->DeleteData(mOffset, length));
+}
+
+nsresult InsertTextTxn::Redo(void)
+{
+  return Do();
+}
+
+nsresult InsertTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}
+
+nsresult InsertTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mStringToInsert;
+  }
+  return NS_OK;
+}

editor/libeditor/base/InsertTextTxn.h

@@ -0,0 +1,71 @@
+/* -*- 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.
+ */
+
+#ifndef InsertTextTxn_h__
+#define InsertTextTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMCharacterData;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ * This transaction covers add, remove, and change attribute.
+ */
+class InsertTextTxn : public EditTxn
+{
+public:
+
+  InsertTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                const nsString& aStringToInsert);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(void);
+
+  virtual nsresult Redo(void);
+
+  virtual nsresult GetIsTransient(PRBool *aIsTransient);
+
+  virtual nsresult Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
+
+  virtual nsresult Write(nsIOutputStream *aOutputStream);
+
+  virtual nsresult GetUndoString(nsString **aString);
+
+  virtual nsresult GetRedoString(nsString **aString);
+
+protected:
+  
+  /** the text element to operate upon */
+  nsIDOMCharacterData *mElement;
+  
+  /** the offset into mElement where the insertion is to take place */
+  PRUint32 mOffset;
+
+  /** the value to set the attribute to (ignored if mRemoveAttribute==PR_TRUE) */
+  nsString mValue;
+
+  /** the text to insert into mElement at mOffset */
+  nsString mStringToInsert;
+
+};
+
+#endif