1 files changed, 140 insertions, 0 deletions
diff --git a/editor/libeditor/DeleteNodeTransaction.cpp b/editor/libeditor/DeleteNodeTransaction.cpp
new file mode 100644
index 0000000000..eb106a1288
--- /dev/null
+++ b/editor/libeditor/DeleteNodeTransaction.cpp
@@ -0,0 +1,140 @@
+/* -*- 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 "DeleteNodeTransaction.h"
+
+#include "HTMLEditUtils.h"
+#include "mozilla/EditorBase.h"
+#include "mozilla/SelectionState.h"  // RangeUpdater
+#include "mozilla/TextEditor.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsAString.h"
+
+namespace mozilla {
+
+// static
+already_AddRefed<DeleteNodeTransaction> DeleteNodeTransaction::MaybeCreate(
+    EditorBase& aEditorBase, nsIContent& aContentToDelete) {
+  RefPtr<DeleteNodeTransaction> transaction =
+      new DeleteNodeTransaction(aEditorBase, aContentToDelete);
+  if (NS_WARN_IF(!transaction->CanDoIt())) {
+    return nullptr;
+  }
+  return transaction.forget();
+}
+
+DeleteNodeTransaction::DeleteNodeTransaction(EditorBase& aEditorBase,
+                                             nsIContent& aContentToDelete)
+    : mEditorBase(&aEditorBase),
+      mContentToDelete(&aContentToDelete),
+      mParentNode(aContentToDelete.GetParentNode()) {}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction, EditTransactionBase,
+                                   mEditorBase, mContentToDelete, mParentNode,
+                                   mRefContent)
+
+NS_IMPL_ADDREF_INHERITED(DeleteNodeTransaction, EditTransactionBase)
+NS_IMPL_RELEASE_INHERITED(DeleteNodeTransaction, EditTransactionBase)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+bool DeleteNodeTransaction::CanDoIt() const {
+  if (NS_WARN_IF(!mContentToDelete) || NS_WARN_IF(!mEditorBase) ||
+      !mParentNode) {
+    return false;
+  }
+  return mEditorBase->IsTextEditor() ||
+         HTMLEditUtils::IsSimplyEditableNode(*mParentNode);
+}
+
+NS_IMETHODIMP DeleteNodeTransaction::DoTransaction() {
+  if (NS_WARN_IF(!CanDoIt())) {
+    return NS_OK;
+  }
+
+  if (mEditorBase->IsTextEditor() && mContentToDelete->IsText()) {
+    uint32_t length = mContentToDelete->AsText()->TextLength();
+    if (length > 0) {
+      mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
+    }
+  }
+
+  // Remember which child mContentToDelete was (by remembering which child was
+  // next).  Note that mRefContent can be nullptr.
+  mRefContent = mContentToDelete->GetNextSibling();
+
+  // give range updater a chance.  SelAdjDeleteNode() needs to be called
+  // *before* we do the action, unlike some of the other RangeItem update
+  // methods.
+  mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
+
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  ErrorResult error;
+  parentNode->RemoveChild(contentToDelete, error);
+  NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
+  return error.StealNSResult();
+}
+
+MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODIMP
+DeleteNodeTransaction::UndoTransaction() {
+  if (NS_WARN_IF(!CanDoIt())) {
+    // This is a legal state, the transaction is a no-op.
+    return NS_OK;
+  }
+  ErrorResult error;
+  OwningNonNull<EditorBase> editorBase = *mEditorBase;
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  nsCOMPtr<nsIContent> refContent = mRefContent;
+  // XXX Perhaps, we should check `refContent` is a child of `parentNode`,
+  //     and if it's not, we should stop undoing or something.
+  parentNode->InsertBefore(contentToDelete, refContent, error);
+  // InsertBefore() may call MightThrowJSException() even if there is no error.
+  // We don't need the flag here.
+  error.WouldReportJSException();
+  if (error.Failed()) {
+    NS_WARNING("nsINode::InsertBefore() failed");
+    return error.StealNSResult();
+  }
+  if (editorBase->IsTextEditor() && contentToDelete->IsText()) {
+    uint32_t length = contentToDelete->AsText()->TextLength();
+    if (length > 0) {
+      nsresult rv = MOZ_KnownLive(editorBase->AsTextEditor())
+                        ->DidInsertText(length, 0, length);
+      if (NS_FAILED(rv)) {
+        NS_WARNING("TextEditor::DidInsertText() failed");
+        return rv;
+      }
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP DeleteNodeTransaction::RedoTransaction() {
+  if (NS_WARN_IF(!CanDoIt())) {
+    // This is a legal state, the transaction is a no-op.
+    return NS_OK;
+  }
+
+  if (mEditorBase->IsTextEditor() && mContentToDelete->IsText()) {
+    uint32_t length = mContentToDelete->AsText()->TextLength();
+    if (length > 0) {
+      mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
+    }
+  }
+
+  mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
+
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  ErrorResult error;
+  parentNode->RemoveChild(contentToDelete, error);
+  NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
+  return error.StealNSResult();
+}
+
+}  // namespace mozilla