1 files changed, 102 insertions, 0 deletions
diff --git a/editor/libeditor/DeleteTextTransaction.cpp b/editor/libeditor/DeleteTextTransaction.cpp
new file mode 100644
index 000000000..6de3181da
--- /dev/null
+++ b/editor/libeditor/DeleteTextTransaction.cpp
@@ -0,0 +1,102 @@
+/* -*- 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 "DeleteTextTransaction.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/EditorBase.h"
+#include "mozilla/SelectionState.h"
+#include "mozilla/dom/Selection.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsIEditor.h"
+#include "nsISupportsImpl.h"
+#include "nsAString.h"
+
+namespace mozilla {
+
+using namespace dom;
+
+DeleteTextTransaction::DeleteTextTransaction(
+                         EditorBase& aEditorBase,
+                         nsGenericDOMDataNode& aCharData,
+                         uint32_t aOffset,
+                         uint32_t aNumCharsToDelete,
+                         RangeUpdater* aRangeUpdater)
+  : mEditorBase(aEditorBase)
+  , mCharData(&aCharData)
+  , mOffset(aOffset)
+  , mNumCharsToDelete(aNumCharsToDelete)
+  , mRangeUpdater(aRangeUpdater)
+{
+  NS_ASSERTION(mCharData->Length() >= aOffset + aNumCharsToDelete,
+               "Trying to delete more characters than in node");
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTransaction, EditTransactionBase,
+                                   mCharData)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+nsresult
+DeleteTextTransaction::Init()
+{
+  // Do nothing if the node is read-only
+  if (!mEditorBase.IsModifiableNode(mCharData)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+DeleteTextTransaction::DoTransaction()
+{
+  MOZ_ASSERT(mCharData);
+
+  // Get the text that we're about to delete
+  nsresult rv = mCharData->SubstringData(mOffset, mNumCharsToDelete,
+                                         mDeletedText);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  rv = mCharData->DeleteData(mOffset, mNumCharsToDelete);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (mRangeUpdater) {
+    mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete);
+  }
+
+  // Only set selection to deletion point if editor gives permission
+  if (mEditorBase.GetShouldTxnSetSelection()) {
+    RefPtr<Selection> selection = mEditorBase.GetSelection();
+    NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+    rv = selection->Collapse(mCharData, mOffset);
+    NS_ASSERTION(NS_SUCCEEDED(rv),
+                 "Selection could not be collapsed after undo of deletetext");
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  // Else do nothing - DOM Range gravity will adjust selection
+  return NS_OK;
+}
+
+//XXX: We may want to store the selection state and restore it properly.  Was
+//     it an insertion point or an extended selection?
+NS_IMETHODIMP
+DeleteTextTransaction::UndoTransaction()
+{
+  MOZ_ASSERT(mCharData);
+
+  return mCharData->InsertData(mOffset, mDeletedText);
+}
+
+NS_IMETHODIMP
+DeleteTextTransaction::GetTxnDescription(nsAString& aString)
+{
+  aString.AssignLiteral("DeleteTextTransaction: ");
+  aString += mDeletedText;
+  return NS_OK;
+}
+
+} // namespace mozilla