/* -*- 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, mEditorBase, 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 (NS_WARN_IF(!mEditorBase) || !mEditorBase->IsModifiableNode(mCharData)) { return NS_ERROR_FAILURE; } return NS_OK; } NS_IMETHODIMP DeleteTextTransaction::DoTransaction() { if (NS_WARN_IF(!mCharData) || NS_WARN_IF(!mEditorBase)) { return NS_ERROR_NOT_INITIALIZED; } // 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() { if (NS_WARN_IF(!mCharData)) { return NS_ERROR_NOT_INITIALIZED; } return mCharData->InsertData(mOffset, mDeletedText); } NS_IMETHODIMP DeleteTextTransaction::GetTxnDescription(nsAString& aString) { aString.AssignLiteral("DeleteTextTransaction: "); aString += mDeletedText; return NS_OK; } } // namespace mozilla