create element transaction WIP

editor/base/CreateElementTxn.cpp

@@ -0,0 +1,128 @@
+/* -*- 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 "CreateElementTxn.h"
+#include "editor.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMElement.h"
+
+// note that aEditor is not refcounted
+CreateElementTxn::CreateElementTxn(nsEditor *aEditor,
+                                   nsIDOMDocument *aDoc,
+                                   nsString& aTag,
+                                   nsIDOMNode *aParent,
+                                   PRUint32 aOffsetInParent)
+  : EditTxn(aEditor)
+{
+  mDoc = aDoc;
+  NS_ADDREF(mDoc);
+  mTag = aTag;
+  mParent = aParent;
+  NS_ADDREF(mParent);
+  mOffsetInParent = aOffsetInParent;
+  mNewNode = nsnull;
+}
+
+CreateElementTxn::~CreateElementTxn()
+{
+  NS_IF_RELEASE(mDoc);
+  NS_IF_RELEASE(mParent);
+}
+
+nsresult CreateElementTxn::Do(void)
+{
+  // create a new node
+  nsresult result = mDoc->CreateElement(mTag, &mNewNode);
+  NS_ASSERTION(((NS_SUCCEEDED(result)) && (nsnull!=mNewNode)), "could not create element.");
+
+  if ((NS_SUCCEEDED(result)) && (nsnull!=mNewNode))
+  {
+    // insert the new node
+    nsIDOMNode *resultNode=nsnull;
+    if (CreateElementTxn::eAppend==mOffsetInParent)
+    {
+      result = mParent->AppendChild(mNewNode, &resultNode);
+      //XXX: do we need to do anything with resultNode? release a refcount?
+    }
+    else
+    {
+      nsCOMPtr<nsIDOMNodeList> childNodes;
+      result = mParent->GetChildNodes(getter_AddRefs(childNodes));
+      if ((NS_SUCCEEDED(result)) && (childNodes))
+      {
+        result = childNodes->Item(mOffsetInParent, &mRefNode);
+        if ((NS_SUCCEEDED(result)) && (nsnull!=mRefNode))
+        {
+          result = mParent->InsertBefore(mNewNode, mRefNode, &resultNode);
+          //XXX: do we need to do anything with resultNode? release a refcount?
+        }
+      }
+    }
+  }
+  return result;
+}
+
+nsresult CreateElementTxn::Undo(void)
+{
+  return NS_OK;//(mParent->InsertData(mOffset, mDeletedText));
+}
+
+nsresult CreateElementTxn::Redo(void)
+{
+  nsIDOMNode *resultNode=nsnull;
+  return (mParent->InsertBefore(mNewNode, mRefNode, &resultNode));
+}
+
+nsresult CreateElementTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Create Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}

editor/base/CreateElementTxn.h

@@ -0,0 +1,83 @@
+/* -*- 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 CreateElementTxn_h__
+#define CreateElementTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMDocument;
+class nsIDOMNode;
+class nsIDOMElement;
+
+/**
+ * A transaction that creates a new node in the content tree.
+ */
+class CreateElementTxn : public EditTxn
+{
+public:
+
+  enum { eAppend=-1 };
+
+  CreateElementTxn(nsEditor *aEditor,
+                   nsIDOMDocument *aDoc,
+                   nsString& aTag,
+                   nsIDOMNode *aParent,
+                   PRUint32 aOffsetInParent);
+
+  virtual ~CreateElementTxn();
+
+  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 document into which the new node will be inserted */
+  nsIDOMDocument *mDoc;
+  
+  /** the tag (mapping to object type) for the new element */
+  nsString mTag;
+
+  /** the node into which the new node will be inserted */
+  nsIDOMNode *mParent;
+
+  /** the index in mParent for the new node */
+  PRUint32 mOffsetInParent;
+
+  /** the new node to insert */
+  nsIDOMElement *mNewNode;  
+
+  /** the node we will insert mNewNode before.  We compute this ourselves. */
+  nsIDOMNode *mRefNode;
+
+};
+
+#endif

editor/base/Makefile.in

@@ -32,6 +32,7 @@ CPPSRCS =                       \
     EditTxn.cpp                 \
     InsertTextTxn.cpp           \
     DeleteTextTxn.cpp           \
+    CreateElementTxn.cpp        \
     $(NULL)
 
 MODULE = editor

editor/base/editorInterfaces.cpp

@@ -16,15 +16,19 @@
  * Reserved.
  */
 #include "editorInterfaces.h"
-#include "nsString.h"
 #include "editor.h"
+
 #include "ChangeAttributeTxn.h"
 #include "InsertTextTxn.h"
 #include "DeleteTextTxn.h"
+#include "CreateElementTxn.h"
+
 #include "nsIDOMDocument.h"
 #include "nsIDOMElement.h"
 #include "nsIDOMCharacterData.h"
 
+#include "nsString.h"
+
 static NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
 static NS_DEFINE_IID(kIDOMCharacterDataIID, NS_IDOMCHARACTERDATA_IID);
 
@@ -282,6 +286,45 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
         aProcessed=PR_TRUE;
         break;
 
+      case nsIDOMEvent::VK_INSERT:
+        {
+          nsresult result;
+          //XXX: should be from a factory
+          //XXX: should manage the refcount of txn
+          nsString attribute("src");
+          nsString value("resource:/res/samples/raptor.jpg");
+
+          nsString imgTag("IMG");
+          nsString bodyTag("BODY");
+          nsCOMPtr<nsIDOMNode> currentNode;
+          result = mEditor->GetFirstNodeOfType(nsnull, bodyTag, getter_AddRefs(currentNode));
+          if (NS_SUCCEEDED(result))
+          {
+            nsIDOMDocument *doc=nsnull;
+            result = mEditor->GetDomInterface(&doc);
+            if (NS_SUCCEEDED(result))
+            {
+              CreateElementTxn *txn;
+              txn = new CreateElementTxn(mEditor, doc, imgTag, currentNode, 0);
+              mEditor->ExecuteTransaction(txn);
+            }
+          }
+
+          /* for building a composite transaction */
+          nsCOMPtr<nsIDOMElement> element;
+          if (NS_SUCCEEDED(mEditor->GetFirstNodeOfType(nsnull, imgTag, getter_AddRefs(currentNode))))
+          {
+            if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
+            {
+              ChangeAttributeTxn *txn;
+              txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_FALSE);
+              mEditor->ExecuteTransaction(txn);        
+            }
+          }
+        }
+        aProcessed=PR_TRUE;
+        break;
+
     }
   }
   return NS_OK;

editor/base/makefile.win

@@ -28,6 +28,7 @@ CPPSRCS =				\
       ChangeAttributeTxn.cpp \
       InsertTextTxn.cpp \
       DeleteTextTxn.cpp \
+      CreateElementTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
@@ -38,6 +39,7 @@ CPP_OBJS =					\
   .\$(OBJDIR)\ChangeAttributeTxn.obj \
   .\$(OBJDIR)\InsertTextTxn.obj \
   .\$(OBJDIR)\DeleteTextTxn.obj \
+  .\$(OBJDIR)\CreateElementTxn.obj \
 	$(NULL)
 
 MODULE=editor 

editor/core/CreateElementTxn.cpp

@@ -0,0 +1,128 @@
+/* -*- 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 "CreateElementTxn.h"
+#include "editor.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMElement.h"
+
+// note that aEditor is not refcounted
+CreateElementTxn::CreateElementTxn(nsEditor *aEditor,
+                                   nsIDOMDocument *aDoc,
+                                   nsString& aTag,
+                                   nsIDOMNode *aParent,
+                                   PRUint32 aOffsetInParent)
+  : EditTxn(aEditor)
+{
+  mDoc = aDoc;
+  NS_ADDREF(mDoc);
+  mTag = aTag;
+  mParent = aParent;
+  NS_ADDREF(mParent);
+  mOffsetInParent = aOffsetInParent;
+  mNewNode = nsnull;
+}
+
+CreateElementTxn::~CreateElementTxn()
+{
+  NS_IF_RELEASE(mDoc);
+  NS_IF_RELEASE(mParent);
+}
+
+nsresult CreateElementTxn::Do(void)
+{
+  // create a new node
+  nsresult result = mDoc->CreateElement(mTag, &mNewNode);
+  NS_ASSERTION(((NS_SUCCEEDED(result)) && (nsnull!=mNewNode)), "could not create element.");
+
+  if ((NS_SUCCEEDED(result)) && (nsnull!=mNewNode))
+  {
+    // insert the new node
+    nsIDOMNode *resultNode=nsnull;
+    if (CreateElementTxn::eAppend==mOffsetInParent)
+    {
+      result = mParent->AppendChild(mNewNode, &resultNode);
+      //XXX: do we need to do anything with resultNode? release a refcount?
+    }
+    else
+    {
+      nsCOMPtr<nsIDOMNodeList> childNodes;
+      result = mParent->GetChildNodes(getter_AddRefs(childNodes));
+      if ((NS_SUCCEEDED(result)) && (childNodes))
+      {
+        result = childNodes->Item(mOffsetInParent, &mRefNode);
+        if ((NS_SUCCEEDED(result)) && (nsnull!=mRefNode))
+        {
+          result = mParent->InsertBefore(mNewNode, mRefNode, &resultNode);
+          //XXX: do we need to do anything with resultNode? release a refcount?
+        }
+      }
+    }
+  }
+  return result;
+}
+
+nsresult CreateElementTxn::Undo(void)
+{
+  return NS_OK;//(mParent->InsertData(mOffset, mDeletedText));
+}
+
+nsresult CreateElementTxn::Redo(void)
+{
+  nsIDOMNode *resultNode=nsnull;
+  return (mParent->InsertBefore(mNewNode, mRefNode, &resultNode));
+}
+
+nsresult CreateElementTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Create Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}

editor/core/CreateElementTxn.h

@@ -0,0 +1,83 @@
+/* -*- 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 CreateElementTxn_h__
+#define CreateElementTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMDocument;
+class nsIDOMNode;
+class nsIDOMElement;
+
+/**
+ * A transaction that creates a new node in the content tree.
+ */
+class CreateElementTxn : public EditTxn
+{
+public:
+
+  enum { eAppend=-1 };
+
+  CreateElementTxn(nsEditor *aEditor,
+                   nsIDOMDocument *aDoc,
+                   nsString& aTag,
+                   nsIDOMNode *aParent,
+                   PRUint32 aOffsetInParent);
+
+  virtual ~CreateElementTxn();
+
+  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 document into which the new node will be inserted */
+  nsIDOMDocument *mDoc;
+  
+  /** the tag (mapping to object type) for the new element */
+  nsString mTag;
+
+  /** the node into which the new node will be inserted */
+  nsIDOMNode *mParent;
+
+  /** the index in mParent for the new node */
+  PRUint32 mOffsetInParent;
+
+  /** the new node to insert */
+  nsIDOMElement *mNewNode;  
+
+  /** the node we will insert mNewNode before.  We compute this ourselves. */
+  nsIDOMNode *mRefNode;
+
+};
+
+#endif

editor/core/Makefile.in

@@ -32,6 +32,7 @@ CPPSRCS =                       \
     EditTxn.cpp                 \
     InsertTextTxn.cpp           \
     DeleteTextTxn.cpp           \
+    CreateElementTxn.cpp        \
     $(NULL)
 
 MODULE = editor

editor/core/editorInterfaces.cpp

@@ -16,15 +16,19 @@
  * Reserved.
  */
 #include "editorInterfaces.h"
-#include "nsString.h"
 #include "editor.h"
+
 #include "ChangeAttributeTxn.h"
 #include "InsertTextTxn.h"
 #include "DeleteTextTxn.h"
+#include "CreateElementTxn.h"
+
 #include "nsIDOMDocument.h"
 #include "nsIDOMElement.h"
 #include "nsIDOMCharacterData.h"
 
+#include "nsString.h"
+
 static NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
 static NS_DEFINE_IID(kIDOMCharacterDataIID, NS_IDOMCHARACTERDATA_IID);
 
@@ -282,6 +286,45 @@ nsEditorKeyListener::ProcessShortCutKeys(nsIDOMEvent* aKeyEvent, PRBool& aProces
         aProcessed=PR_TRUE;
         break;
 
+      case nsIDOMEvent::VK_INSERT:
+        {
+          nsresult result;
+          //XXX: should be from a factory
+          //XXX: should manage the refcount of txn
+          nsString attribute("src");
+          nsString value("resource:/res/samples/raptor.jpg");
+
+          nsString imgTag("IMG");
+          nsString bodyTag("BODY");
+          nsCOMPtr<nsIDOMNode> currentNode;
+          result = mEditor->GetFirstNodeOfType(nsnull, bodyTag, getter_AddRefs(currentNode));
+          if (NS_SUCCEEDED(result))
+          {
+            nsIDOMDocument *doc=nsnull;
+            result = mEditor->GetDomInterface(&doc);
+            if (NS_SUCCEEDED(result))
+            {
+              CreateElementTxn *txn;
+              txn = new CreateElementTxn(mEditor, doc, imgTag, currentNode, 0);
+              mEditor->ExecuteTransaction(txn);
+            }
+          }
+
+          /* for building a composite transaction */
+          nsCOMPtr<nsIDOMElement> element;
+          if (NS_SUCCEEDED(mEditor->GetFirstNodeOfType(nsnull, imgTag, getter_AddRefs(currentNode))))
+          {
+            if (NS_SUCCEEDED(currentNode->QueryInterface(kIDOMElementIID, getter_AddRefs(element)))) 
+            {
+              ChangeAttributeTxn *txn;
+              txn = new ChangeAttributeTxn(mEditor, element, attribute, value, PR_FALSE);
+              mEditor->ExecuteTransaction(txn);        
+            }
+          }
+        }
+        aProcessed=PR_TRUE;
+        break;
+
     }
   }
   return NS_OK;

editor/core/makefile.win

@@ -28,6 +28,7 @@ CPPSRCS =				\
       ChangeAttributeTxn.cpp \
       InsertTextTxn.cpp \
       DeleteTextTxn.cpp \
+      CreateElementTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
@@ -38,6 +39,7 @@ CPP_OBJS =					\
   .\$(OBJDIR)\ChangeAttributeTxn.obj \
   .\$(OBJDIR)\InsertTextTxn.obj \
   .\$(OBJDIR)\DeleteTextTxn.obj \
+  .\$(OBJDIR)\CreateElementTxn.obj \
 	$(NULL)
 
 MODULE=editor 

editor/libeditor/base/CreateElementTxn.cpp

@@ -0,0 +1,128 @@
+/* -*- 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 "CreateElementTxn.h"
+#include "editor.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMElement.h"
+
+// note that aEditor is not refcounted
+CreateElementTxn::CreateElementTxn(nsEditor *aEditor,
+                                   nsIDOMDocument *aDoc,
+                                   nsString& aTag,
+                                   nsIDOMNode *aParent,
+                                   PRUint32 aOffsetInParent)
+  : EditTxn(aEditor)
+{
+  mDoc = aDoc;
+  NS_ADDREF(mDoc);
+  mTag = aTag;
+  mParent = aParent;
+  NS_ADDREF(mParent);
+  mOffsetInParent = aOffsetInParent;
+  mNewNode = nsnull;
+}
+
+CreateElementTxn::~CreateElementTxn()
+{
+  NS_IF_RELEASE(mDoc);
+  NS_IF_RELEASE(mParent);
+}
+
+nsresult CreateElementTxn::Do(void)
+{
+  // create a new node
+  nsresult result = mDoc->CreateElement(mTag, &mNewNode);
+  NS_ASSERTION(((NS_SUCCEEDED(result)) && (nsnull!=mNewNode)), "could not create element.");
+
+  if ((NS_SUCCEEDED(result)) && (nsnull!=mNewNode))
+  {
+    // insert the new node
+    nsIDOMNode *resultNode=nsnull;
+    if (CreateElementTxn::eAppend==mOffsetInParent)
+    {
+      result = mParent->AppendChild(mNewNode, &resultNode);
+      //XXX: do we need to do anything with resultNode? release a refcount?
+    }
+    else
+    {
+      nsCOMPtr<nsIDOMNodeList> childNodes;
+      result = mParent->GetChildNodes(getter_AddRefs(childNodes));
+      if ((NS_SUCCEEDED(result)) && (childNodes))
+      {
+        result = childNodes->Item(mOffsetInParent, &mRefNode);
+        if ((NS_SUCCEEDED(result)) && (nsnull!=mRefNode))
+        {
+          result = mParent->InsertBefore(mNewNode, mRefNode, &resultNode);
+          //XXX: do we need to do anything with resultNode? release a refcount?
+        }
+      }
+    }
+  }
+  return result;
+}
+
+nsresult CreateElementTxn::Undo(void)
+{
+  return NS_OK;//(mParent->InsertData(mOffset, mDeletedText));
+}
+
+nsresult CreateElementTxn::Redo(void)
+{
+  nsIDOMNode *resultNode=nsnull;
+  return (mParent->InsertBefore(mNewNode, mRefNode, &resultNode));
+}
+
+nsresult CreateElementTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}
+
+nsresult CreateElementTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Create Element: ";
+    **aString += mTag;
+  }
+  return NS_OK;
+}

editor/libeditor/base/CreateElementTxn.h

@@ -0,0 +1,83 @@
+/* -*- 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 CreateElementTxn_h__
+#define CreateElementTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMDocument;
+class nsIDOMNode;
+class nsIDOMElement;
+
+/**
+ * A transaction that creates a new node in the content tree.
+ */
+class CreateElementTxn : public EditTxn
+{
+public:
+
+  enum { eAppend=-1 };
+
+  CreateElementTxn(nsEditor *aEditor,
+                   nsIDOMDocument *aDoc,
+                   nsString& aTag,
+                   nsIDOMNode *aParent,
+                   PRUint32 aOffsetInParent);
+
+  virtual ~CreateElementTxn();
+
+  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 document into which the new node will be inserted */
+  nsIDOMDocument *mDoc;
+  
+  /** the tag (mapping to object type) for the new element */
+  nsString mTag;
+
+  /** the node into which the new node will be inserted */
+  nsIDOMNode *mParent;
+
+  /** the index in mParent for the new node */
+  PRUint32 mOffsetInParent;
+
+  /** the new node to insert */
+  nsIDOMElement *mNewNode;  
+
+  /** the node we will insert mNewNode before.  We compute this ourselves. */
+  nsIDOMNode *mRefNode;
+
+};
+
+#endif