Delete Text Transaction initial implementation

editor/base/DeleteTextTxn.cpp

@@ -0,0 +1,84 @@
+/* -*- 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 "DeleteTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+DeleteTextTxn::DeleteTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             PRUint32 aNumCharsToDelete)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mNumCharsToDelete = aNumCharsToDelete;
+  mDeletedText = "";
+}
+
+nsresult DeleteTextTxn::Do(void)
+{
+  // get the text that we're about to delete
+  nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
+  NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
+  return (mElement->DeleteData(mOffset, mNumCharsToDelete));
+}
+
+nsresult DeleteTextTxn::Undo(void)
+{
+  return (mElement->InsertData(mOffset, mDeletedText));
+}
+
+nsresult DeleteTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}

editor/base/DeleteTextTxn.h

@@ -0,0 +1,69 @@
+/* -*- 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 DeleteTextTxn_h__
+#define DeleteTextTxn_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 DeleteTextTxn : public EditTxn
+{
+public:
+
+  DeleteTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                PRUint32 aNumCharsToDelete);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(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 deletion is to take place */
+  PRUint32 mOffset;
+
+  /** the number of characters to delete */
+  PRUint32 mNumCharsToDelete;
+
+  /** the text that was deleted */
+  nsString mDeletedText;
+
+};
+
+#endif

editor/core/DeleteTextTxn.cpp

@@ -0,0 +1,84 @@
+/* -*- 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 "DeleteTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+DeleteTextTxn::DeleteTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             PRUint32 aNumCharsToDelete)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mNumCharsToDelete = aNumCharsToDelete;
+  mDeletedText = "";
+}
+
+nsresult DeleteTextTxn::Do(void)
+{
+  // get the text that we're about to delete
+  nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
+  NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
+  return (mElement->DeleteData(mOffset, mNumCharsToDelete));
+}
+
+nsresult DeleteTextTxn::Undo(void)
+{
+  return (mElement->InsertData(mOffset, mDeletedText));
+}
+
+nsresult DeleteTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}

editor/core/DeleteTextTxn.h

@@ -0,0 +1,69 @@
+/* -*- 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 DeleteTextTxn_h__
+#define DeleteTextTxn_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 DeleteTextTxn : public EditTxn
+{
+public:
+
+  DeleteTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                PRUint32 aNumCharsToDelete);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(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 deletion is to take place */
+  PRUint32 mOffset;
+
+  /** the number of characters to delete */
+  PRUint32 mNumCharsToDelete;
+
+  /** the text that was deleted */
+  nsString mDeletedText;
+
+};
+
+#endif

editor/libeditor/base/DeleteTextTxn.cpp

@@ -0,0 +1,84 @@
+/* -*- 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 "DeleteTextTxn.h"
+#include "editor.h"
+#include "nsIDOMCharacterData.h"
+
+// note that aEditor is not refcounted
+DeleteTextTxn::DeleteTextTxn(nsEditor *aEditor,
+                             nsIDOMCharacterData *aElement,
+                             PRUint32 aOffset,
+                             PRUint32 aNumCharsToDelete)
+  : EditTxn(aEditor)
+{
+  mElement = aElement;
+  mOffset = aOffset;
+  mNumCharsToDelete = aNumCharsToDelete;
+  mDeletedText = "";
+}
+
+nsresult DeleteTextTxn::Do(void)
+{
+  // get the text that we're about to delete
+  nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
+  NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
+  return (mElement->DeleteData(mOffset, mNumCharsToDelete));
+}
+
+nsresult DeleteTextTxn::Undo(void)
+{
+  return (mElement->InsertData(mOffset, mDeletedText));
+}
+
+nsresult DeleteTextTxn::GetIsTransient(PRBool *aIsTransient)
+{
+  if (nsnull!=aIsTransient)
+    *aIsTransient = PR_FALSE;
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
+{
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetUndoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Insert Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}
+
+nsresult DeleteTextTxn::GetRedoString(nsString **aString)
+{
+  if (nsnull!=aString)
+  {
+    **aString="Remove Text: ";
+    **aString += mDeletedText;
+  }
+  return NS_OK;
+}

editor/libeditor/base/DeleteTextTxn.h

@@ -0,0 +1,69 @@
+/* -*- 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 DeleteTextTxn_h__
+#define DeleteTextTxn_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 DeleteTextTxn : public EditTxn
+{
+public:
+
+  DeleteTextTxn(nsEditor *aEditor,
+                nsIDOMCharacterData *aElement,
+                PRUint32 aOffset,
+                PRUint32 aNumCharsToDelete);
+
+  virtual nsresult Do(void);
+
+  virtual nsresult Undo(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 deletion is to take place */
+  PRUint32 mOffset;
+
+  /** the number of characters to delete */
+  PRUint32 mNumCharsToDelete;
+
+  /** the text that was deleted */
+  nsString mDeletedText;
+
+};
+
+#endif