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/* -*- 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
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