1 files changed, 112 insertions, 0 deletions
diff --git a/editor/libeditor/ChangeAttributeTransaction.cpp b/editor/libeditor/ChangeAttributeTransaction.cpp
new file mode 100644
index 0000000000..a9791502b7
--- /dev/null
+++ b/editor/libeditor/ChangeAttributeTransaction.cpp
@@ -0,0 +1,112 @@
+/* -*- 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;
+
+// static
+already_AddRefed<ChangeAttributeTransaction> ChangeAttributeTransaction::Create(
+    Element& aElement, nsAtom& aAttribute, const nsAString& aValue) {
+  RefPtr<ChangeAttributeTransaction> transaction =
+      new ChangeAttributeTransaction(aElement, aAttribute, &aValue);
+  return transaction.forget();
+}
+
+// static
+already_AddRefed<ChangeAttributeTransaction>
+ChangeAttributeTransaction::CreateToRemove(Element& aElement,
+                                           nsAtom& aAttribute) {
+  RefPtr<ChangeAttributeTransaction> transaction =
+      new ChangeAttributeTransaction(aElement, aAttribute, nullptr);
+  return transaction.forget();
+}
+
+ChangeAttributeTransaction::ChangeAttributeTransaction(Element& aElement,
+                                                       nsAtom& aAttribute,
+                                                       const nsAString* aValue)
+    : EditTransactionBase(),
+      mElement(&aElement),
+      mAttribute(&aAttribute),
+      mValue(aValue ? *aValue : u""_ns),
+      mRemoveAttribute(!aValue),
+      mAttributeWasSet(false) {}
+
+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) {
+    OwningNonNull<Element> element = *mElement;
+    nsresult rv = element->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::UnsetAttr() failed");
+    return rv;
+  }
+
+  OwningNonNull<Element> element = *mElement;
+  nsresult rv = element->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::SetAttr() failed");
+  return rv;
+}
+
+NS_IMETHODIMP ChangeAttributeTransaction::UndoTransaction() {
+  if (NS_WARN_IF(!mElement)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  if (mAttributeWasSet) {
+    OwningNonNull<Element> element = *mElement;
+    nsresult rv =
+        element->SetAttr(kNameSpaceID_None, mAttribute, mUndoValue, true);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::SetAttr() failed");
+    return rv;
+  }
+  OwningNonNull<Element> element = *mElement;
+  nsresult rv = element->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::UnsetAttr() failed");
+  return rv;
+}
+
+NS_IMETHODIMP ChangeAttributeTransaction::RedoTransaction() {
+  if (NS_WARN_IF(!mElement)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  if (mRemoveAttribute) {
+    OwningNonNull<Element> element = *mElement;
+    nsresult rv = element->UnsetAttr(kNameSpaceID_None, mAttribute, true);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::UnsetAttr() failed");
+    return rv;
+  }
+
+  OwningNonNull<Element> element = *mElement;
+  nsresult rv = element->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Element::SetAttr() failed");
+  return rv;
+}
+
+}  // namespace mozilla