1 files changed, 98 insertions, 0 deletions
diff --git a/editor/libeditor/ChangeAttributeTransaction.cpp b/editor/libeditor/ChangeAttributeTransaction.cpp
new file mode 100644
index 000000000..04f539856
--- /dev/null
+++ b/editor/libeditor/ChangeAttributeTransaction.cpp
@@ -0,0 +1,98 @@
+/* -*- 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/. */
+
+#include "ChangeAttributeTransaction.h"
+
+#include "mozilla/dom/Element.h"        // for Element
+
+#include "nsAString.h"
+#include "nsError.h"                    // for NS_ERROR_NOT_INITIALIZED, etc.
+
+namespace mozilla {
+
+using namespace dom;
+
+ChangeAttributeTransaction::ChangeAttributeTransaction(Element& aElement,
+                                                       nsIAtom& aAttribute,
+                                                       const nsAString* aValue)
+  : EditTransactionBase()
+  , mElement(&aElement)
+  , mAttribute(&aAttribute)
+  , mValue(aValue ? *aValue : EmptyString())
+  , mRemoveAttribute(!aValue)
+  , mAttributeWasSet(false)
+  , mUndoValue()
+{
+}
+
+ChangeAttributeTransaction::~ChangeAttributeTransaction()
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeAttributeTransaction,
+                                   EditTransactionBase,
+                                   mElement)
+
+NS_IMPL_ADDREF_INHERITED(ChangeAttributeTransaction, EditTransactionBase)
+NS_IMPL_RELEASE_INHERITED(ChangeAttributeTransaction, EditTransactionBase)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeAttributeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+NS_IMETHODIMP
+ChangeAttributeTransaction::DoTransaction()
+{
+  // Need to get the current value of the attribute and save it, and set
+  // mAttributeWasSet
+  mAttributeWasSet = mElement->GetAttr(kNameSpaceID_None, mAttribute,
+                                       mUndoValue);
+
+  // XXX: hack until attribute-was-set code is implemented
+  if (!mUndoValue.IsEmpty()) {
+    mAttributeWasSet = true;
+  }
+  // XXX: end hack
+
+  // Now set the attribute to the new value
+  if (mRemoveAttribute) {
+    return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+  }
+
+  return mElement->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
+}
+
+NS_IMETHODIMP
+ChangeAttributeTransaction::UndoTransaction()
+{
+  if (mAttributeWasSet) {
+    return mElement->SetAttr(kNameSpaceID_None, mAttribute, mUndoValue, true);
+  }
+  return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+}
+
+NS_IMETHODIMP
+ChangeAttributeTransaction::RedoTransaction()
+{
+  if (mRemoveAttribute) {
+    return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+  }
+
+  return mElement->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
+}
+
+NS_IMETHODIMP
+ChangeAttributeTransaction::GetTxnDescription(nsAString& aString)
+{
+  aString.AssignLiteral("ChangeAttributeTransaction: [mRemoveAttribute == ");
+
+  if (mRemoveAttribute) {
+    aString.AppendLiteral("true] ");
+  } else {
+    aString.AppendLiteral("false] ");
+  }
+  aString += nsDependentAtomString(mAttribute);
+  return NS_OK;
+}
+
+} // namespace mozilla