107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DeleteTextTransaction.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/EditorBase.h"
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#include "mozilla/SelectionState.h"
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#include "mozilla/dom/Selection.h"
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#include "nsDebug.h"
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#include "nsError.h"
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#include "nsIEditor.h"
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#include "nsISupportsImpl.h"
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#include "nsAString.h"
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namespace mozilla {
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using namespace dom;
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DeleteTextTransaction::DeleteTextTransaction(
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EditorBase& aEditorBase,
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nsGenericDOMDataNode& aCharData,
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uint32_t aOffset,
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uint32_t aNumCharsToDelete,
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RangeUpdater* aRangeUpdater)
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: mEditorBase(&aEditorBase)
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, mCharData(&aCharData)
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, mOffset(aOffset)
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, mNumCharsToDelete(aNumCharsToDelete)
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, mRangeUpdater(aRangeUpdater)
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{
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NS_ASSERTION(mCharData->Length() >= aOffset + aNumCharsToDelete,
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"Trying to delete more characters than in node");
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTransaction, EditTransactionBase,
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mEditorBase,
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mCharData)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTransaction)
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NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
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nsresult
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DeleteTextTransaction::Init()
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{
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// Do nothing if the node is read-only
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if (NS_WARN_IF(!mEditorBase) || !mEditorBase->IsModifiableNode(mCharData)) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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DeleteTextTransaction::DoTransaction()
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{
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if (NS_WARN_IF(!mCharData) || NS_WARN_IF(!mEditorBase)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// Get the text that we're about to delete
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nsresult rv = mCharData->SubstringData(mOffset, mNumCharsToDelete,
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mDeletedText);
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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rv = mCharData->DeleteData(mOffset, mNumCharsToDelete);
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NS_ENSURE_SUCCESS(rv, rv);
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if (mRangeUpdater) {
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mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete);
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}
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// Only set selection to deletion point if editor gives permission
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if (mEditorBase->GetShouldTxnSetSelection()) {
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RefPtr<Selection> selection = mEditorBase->GetSelection();
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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rv = selection->Collapse(mCharData, mOffset);
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NS_ASSERTION(NS_SUCCEEDED(rv),
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"Selection could not be collapsed after undo of deletetext");
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NS_ENSURE_SUCCESS(rv, rv);
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}
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// Else do nothing - DOM Range gravity will adjust selection
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return NS_OK;
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}
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//XXX: We may want to store the selection state and restore it properly. Was
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// it an insertion point or an extended selection?
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NS_IMETHODIMP
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DeleteTextTransaction::UndoTransaction()
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{
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if (NS_WARN_IF(!mCharData)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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return mCharData->InsertData(mOffset, mDeletedText);
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}
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NS_IMETHODIMP
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DeleteTextTransaction::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("DeleteTextTransaction: ");
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aString += mDeletedText;
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return NS_OK;
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}
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} // namespace mozilla
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