ChangedAttributeTxn implementation

base class EditTxn implementation

editor/base/ChangeAttributeTxn.cpp

@@ -0,0 +1,101 @@
+/* -*- 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 "ChangeAttributeTxn.h"
+#include "editor.h"
+
+// note that aEditor is not refcounted
+ChangeAttributeTxn::ChangeAttributeTxn(nsEditor *aEditor,
+                                       nsIDOMElement *aElement,
+                                       const nsString& aAttribute,
+                                       const nsString& aValue)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mAttribute = aAttribute;
+  mValue = aValue;
+  mAttributeWasSet=PR_FALSE;
+}
+
+nsresult ChangeAttributeTxn::Do(void)
+{
+  // need to get the current value of the attribute and save it, and set mAttributeWasSet
+  const int stringlen=100;
+  char attributeAsCString[stringlen+1];
+  char valueAsCString[stringlen+1];
+  mAttribute.ToCString(attributeAsCString, stringlen);
+  mAttributeWasSet;
+  mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, mAttributeWasSet);
+  
+  if (mAttributeWasSet)
+    mUndoValue.ToCString(valueAsCString, stringlen);
+
+  // now set the attribute to the new value
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::Undo(void)
+{
+  nsresult result=NS_OK;
+  if (PR_TRUE==mAttributeWasSet)
+  {
+    result = mEditor->SetAttribute(mElement, mAttribute, mUndoValue);
+  }
+  else
+  {
+    result = mEditor->RemoveAttribute(mElement, mAttribute);
+  }
+
+  return result;
+}
+
+nsresult ChangeAttributeTxn::Redo(void)
+{
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}

editor/base/ChangeAttributeTxn.h

@@ -0,0 +1,62 @@
+/* -*- 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 ChangeAttributeTxn_h__
+#define ChangeAttributeTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMElement;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ */
+class ChangeAttributeTxn : public EditTxn
+{
+public:
+
+  ChangeAttributeTxn(nsEditor *aEditor,
+                     nsIDOMElement *aElement,
+                     const nsString& aAttribute,
+                     const nsString& aValue);
+
+  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:
+  nsIDOMElement *mElement;
+  nsString mAttribute;
+  nsString mValue;
+  nsString mUndoValue;
+  PRBool   mAttributeWasSet;
+};
+
+#endif

editor/base/EditTxn.cpp

@@ -0,0 +1,98 @@
+/* -*- 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 "EditTxn.h"
+
+static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
+static NS_DEFINE_IID(kITransactionIID, NS_ITRANSACTION_IID);
+
+NS_IMPL_ADDREF(EditTxn)
+NS_IMPL_RELEASE(EditTxn)
+
+// note that aEditor is not refcounted
+EditTxn::EditTxn(nsEditor *aEditor)
+{
+  NS_ASSERTION(nsnull!=aEditor, "null aEditor arg to EditTxn constructor");
+  mEditor = aEditor;
+}
+
+nsresult EditTxn::Do(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Undo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Redo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_TRUE;
+  return NS_OK;
+}
+
+nsresult EditTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult EditTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult
+EditTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
+{
+  if (NULL == aInstancePtr) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aIID.Equals(kISupportsIID)) {
+    *aInstancePtr = (void*)(nsISupports*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  if (aIID.Equals(kITransactionIID)) {
+    *aInstancePtr = (void*)(nsITransaction*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  *aInstancePtr = 0;
+  return NS_NOINTERFACE;
+}

editor/base/EditTxn.h

@@ -0,0 +1,59 @@
+/* -*- 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 EditTxn_h__
+#define EditTxn_h__
+
+#include "nsITransaction.h"
+class nsEditor;
+
+/**
+ * base class for all document editing transactions.
+ * provides access to the nsEditor that created this transaction.
+ */
+class EditTxn : public nsITransaction
+{
+public:
+
+  NS_DECL_ISUPPORTS
+
+  EditTxn(nsEditor *aEditor);
+
+  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:
+
+  nsEditor *mEditor;
+
+};
+
+#endif

editor/base/makefile.win

@@ -24,12 +24,16 @@ CPPSRCS =				\
       editor.cpp			\
       editorInterfaces.cpp    \
       nsEditFactory.cpp \
+      EditTxn.cpp \
+      ChangeAttributeTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
 	.\$(OBJDIR)\editor.obj		\
 	.\$(OBJDIR)\nsEditFactory.obj		\
 	.\$(OBJDIR)\editorInterfaces.obj		\
+  .\$(OBJDIR)\EditTxn.obj \
+  .\$(OBJDIR)\ChangeAttributeTxn.obj \
 	$(NULL)
 
 MODULE=editor 
@@ -40,6 +44,7 @@ LINCS=-I$(PUBLIC)\editor \
     -I$(PUBLIC)\xpcom \
     -I$(PUBLIC)\raptor \
     -I$(PUBLIC)\js \
+    -I$(PUBLIC)\txmgr \
     -I$(PUBLIC)\dom
 
 MAKE_OBJ_TYPE = DLL

editor/base/nsEditFactory.cpp

@@ -119,7 +119,7 @@ nsEditFactory::nsEditFactory(const nsCID &aClass)
 
 nsEditFactory::~nsEditFactory()
 {
-  nsRepository::UnregisterFactory(mCID, (nsIFactory *)this); //we are out of ref counts anyway
+  //nsRepository::UnregisterFactory(mCID, (nsIFactory *)this); //we are out of ref counts anyway
 }
 
 

editor/core/ChangeAttributeTxn.cpp

@@ -0,0 +1,101 @@
+/* -*- 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 "ChangeAttributeTxn.h"
+#include "editor.h"
+
+// note that aEditor is not refcounted
+ChangeAttributeTxn::ChangeAttributeTxn(nsEditor *aEditor,
+                                       nsIDOMElement *aElement,
+                                       const nsString& aAttribute,
+                                       const nsString& aValue)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mAttribute = aAttribute;
+  mValue = aValue;
+  mAttributeWasSet=PR_FALSE;
+}
+
+nsresult ChangeAttributeTxn::Do(void)
+{
+  // need to get the current value of the attribute and save it, and set mAttributeWasSet
+  const int stringlen=100;
+  char attributeAsCString[stringlen+1];
+  char valueAsCString[stringlen+1];
+  mAttribute.ToCString(attributeAsCString, stringlen);
+  mAttributeWasSet;
+  mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, mAttributeWasSet);
+  
+  if (mAttributeWasSet)
+    mUndoValue.ToCString(valueAsCString, stringlen);
+
+  // now set the attribute to the new value
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::Undo(void)
+{
+  nsresult result=NS_OK;
+  if (PR_TRUE==mAttributeWasSet)
+  {
+    result = mEditor->SetAttribute(mElement, mAttribute, mUndoValue);
+  }
+  else
+  {
+    result = mEditor->RemoveAttribute(mElement, mAttribute);
+  }
+
+  return result;
+}
+
+nsresult ChangeAttributeTxn::Redo(void)
+{
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}

editor/core/ChangeAttributeTxn.h

@@ -0,0 +1,62 @@
+/* -*- 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 ChangeAttributeTxn_h__
+#define ChangeAttributeTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMElement;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ */
+class ChangeAttributeTxn : public EditTxn
+{
+public:
+
+  ChangeAttributeTxn(nsEditor *aEditor,
+                     nsIDOMElement *aElement,
+                     const nsString& aAttribute,
+                     const nsString& aValue);
+
+  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:
+  nsIDOMElement *mElement;
+  nsString mAttribute;
+  nsString mValue;
+  nsString mUndoValue;
+  PRBool   mAttributeWasSet;
+};
+
+#endif

editor/core/EditTxn.cpp

@@ -0,0 +1,98 @@
+/* -*- 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 "EditTxn.h"
+
+static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
+static NS_DEFINE_IID(kITransactionIID, NS_ITRANSACTION_IID);
+
+NS_IMPL_ADDREF(EditTxn)
+NS_IMPL_RELEASE(EditTxn)
+
+// note that aEditor is not refcounted
+EditTxn::EditTxn(nsEditor *aEditor)
+{
+  NS_ASSERTION(nsnull!=aEditor, "null aEditor arg to EditTxn constructor");
+  mEditor = aEditor;
+}
+
+nsresult EditTxn::Do(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Undo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Redo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_TRUE;
+  return NS_OK;
+}
+
+nsresult EditTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult EditTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult
+EditTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
+{
+  if (NULL == aInstancePtr) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aIID.Equals(kISupportsIID)) {
+    *aInstancePtr = (void*)(nsISupports*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  if (aIID.Equals(kITransactionIID)) {
+    *aInstancePtr = (void*)(nsITransaction*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  *aInstancePtr = 0;
+  return NS_NOINTERFACE;
+}

editor/core/EditTxn.h

@@ -0,0 +1,59 @@
+/* -*- 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 EditTxn_h__
+#define EditTxn_h__
+
+#include "nsITransaction.h"
+class nsEditor;
+
+/**
+ * base class for all document editing transactions.
+ * provides access to the nsEditor that created this transaction.
+ */
+class EditTxn : public nsITransaction
+{
+public:
+
+  NS_DECL_ISUPPORTS
+
+  EditTxn(nsEditor *aEditor);
+
+  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:
+
+  nsEditor *mEditor;
+
+};
+
+#endif

editor/core/makefile.win

@@ -24,12 +24,16 @@ CPPSRCS =				\
       editor.cpp			\
       editorInterfaces.cpp    \
       nsEditFactory.cpp \
+      EditTxn.cpp \
+      ChangeAttributeTxn.cpp \
 	$(NULL)
 
 CPP_OBJS =					\
 	.\$(OBJDIR)\editor.obj		\
 	.\$(OBJDIR)\nsEditFactory.obj		\
 	.\$(OBJDIR)\editorInterfaces.obj		\
+  .\$(OBJDIR)\EditTxn.obj \
+  .\$(OBJDIR)\ChangeAttributeTxn.obj \
 	$(NULL)
 
 MODULE=editor 
@@ -40,6 +44,7 @@ LINCS=-I$(PUBLIC)\editor \
     -I$(PUBLIC)\xpcom \
     -I$(PUBLIC)\raptor \
     -I$(PUBLIC)\js \
+    -I$(PUBLIC)\txmgr \
     -I$(PUBLIC)\dom
 
 MAKE_OBJ_TYPE = DLL

editor/core/nsEditFactory.cpp

@@ -119,7 +119,7 @@ nsEditFactory::nsEditFactory(const nsCID &aClass)
 
 nsEditFactory::~nsEditFactory()
 {
-  nsRepository::UnregisterFactory(mCID, (nsIFactory *)this); //we are out of ref counts anyway
+  //nsRepository::UnregisterFactory(mCID, (nsIFactory *)this); //we are out of ref counts anyway
 }
 
 

editor/libeditor/base/ChangeAttributeTxn.cpp

@@ -0,0 +1,101 @@
+/* -*- 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 "ChangeAttributeTxn.h"
+#include "editor.h"
+
+// note that aEditor is not refcounted
+ChangeAttributeTxn::ChangeAttributeTxn(nsEditor *aEditor,
+                                       nsIDOMElement *aElement,
+                                       const nsString& aAttribute,
+                                       const nsString& aValue)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mAttribute = aAttribute;
+  mValue = aValue;
+  mAttributeWasSet=PR_FALSE;
+}
+
+nsresult ChangeAttributeTxn::Do(void)
+{
+  // need to get the current value of the attribute and save it, and set mAttributeWasSet
+  const int stringlen=100;
+  char attributeAsCString[stringlen+1];
+  char valueAsCString[stringlen+1];
+  mAttribute.ToCString(attributeAsCString, stringlen);
+  mAttributeWasSet;
+  mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, mAttributeWasSet);
+  
+  if (mAttributeWasSet)
+    mUndoValue.ToCString(valueAsCString, stringlen);
+
+  // now set the attribute to the new value
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::Undo(void)
+{
+  nsresult result=NS_OK;
+  if (PR_TRUE==mAttributeWasSet)
+  {
+    result = mEditor->SetAttribute(mElement, mAttribute, mUndoValue);
+  }
+  else
+  {
+    result = mEditor->RemoveAttribute(mElement, mAttribute);
+  }
+
+  return result;
+}
+
+nsresult ChangeAttributeTxn::Redo(void)
+{
+  return mEditor->SetAttribute(mElement, mAttribute, mValue);
+}
+
+nsresult ChangeAttributeTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult ChangeAttributeTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}

editor/libeditor/base/ChangeAttributeTxn.h

@@ -0,0 +1,62 @@
+/* -*- 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 ChangeAttributeTxn_h__
+#define ChangeAttributeTxn_h__
+
+#include "EditTxn.h"
+
+class nsIDOMElement;
+
+/**
+ * A transaction that changes an attribute of a content node. 
+ */
+class ChangeAttributeTxn : public EditTxn
+{
+public:
+
+  ChangeAttributeTxn(nsEditor *aEditor,
+                     nsIDOMElement *aElement,
+                     const nsString& aAttribute,
+                     const nsString& aValue);
+
+  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:
+  nsIDOMElement *mElement;
+  nsString mAttribute;
+  nsString mValue;
+  nsString mUndoValue;
+  PRBool   mAttributeWasSet;
+};
+
+#endif

editor/libeditor/base/EditTxn.cpp

@@ -0,0 +1,98 @@
+/* -*- 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 "EditTxn.h"
+
+static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
+static NS_DEFINE_IID(kITransactionIID, NS_ITRANSACTION_IID);
+
+NS_IMPL_ADDREF(EditTxn)
+NS_IMPL_RELEASE(EditTxn)
+
+// note that aEditor is not refcounted
+EditTxn::EditTxn(nsEditor *aEditor)
+{
+  NS_ASSERTION(nsnull!=aEditor, "null aEditor arg to EditTxn constructor");
+  mEditor = aEditor;
+}
+
+nsresult EditTxn::Do(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Undo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Redo(void)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_TRUE;
+  return NS_OK;
+}
+
+nsresult EditTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult EditTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult EditTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+    *aString=nsnull;
+  return NS_OK;
+}
+
+nsresult
+EditTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
+{
+  if (NULL == aInstancePtr) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aIID.Equals(kISupportsIID)) {
+    *aInstancePtr = (void*)(nsISupports*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  if (aIID.Equals(kITransactionIID)) {
+    *aInstancePtr = (void*)(nsITransaction*)this;
+    NS_ADDREF_THIS();
+    return NS_OK;
+  }
+  *aInstancePtr = 0;
+  return NS_NOINTERFACE;
+}

editor/libeditor/base/EditTxn.h

@@ -0,0 +1,59 @@
+/* -*- 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 EditTxn_h__
+#define EditTxn_h__
+
+#include "nsITransaction.h"
+class nsEditor;
+
+/**
+ * base class for all document editing transactions.
+ * provides access to the nsEditor that created this transaction.
+ */
+class EditTxn : public nsITransaction
+{
+public:
+
+  NS_DECL_ISUPPORTS
+
+  EditTxn(nsEditor *aEditor);
+
+  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:
+
+  nsEditor *mEditor;
+
+};
+
+#endif