gecko-dev/editor/libeditor/base/DeleteTextTxn.cpp

115 lines
3.2 KiB
C++

/* -*- 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 "DeleteTextTxn.h"
#include "mozilla/Assertions.h"
#include "mozilla/Selection.h"
#include "nsAutoPtr.h"
#include "nsDebug.h"
#include "nsEditor.h"
#include "nsError.h"
#include "nsIEditor.h"
#include "nsISelection.h"
#include "nsISupportsImpl.h"
#include "nsSelectionState.h"
#include "nsAString.h"
using namespace mozilla;
DeleteTextTxn::DeleteTextTxn() :
EditTxn(),
mEditor(nullptr),
mCharData(),
mOffset(0),
mNumCharsToDelete(0),
mRangeUpdater(nullptr)
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED_1(DeleteTextTxn, EditTxn,
mCharData)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP
DeleteTextTxn::Init(nsEditor* aEditor,
nsIDOMCharacterData* aCharData,
uint32_t aOffset,
uint32_t aNumCharsToDelete,
nsRangeUpdater* aRangeUpdater)
{
MOZ_ASSERT(aEditor && aCharData);
mEditor = aEditor;
mCharData = aCharData;
// do nothing if the node is read-only
if (!mEditor->IsModifiableNode(mCharData)) {
return NS_ERROR_FAILURE;
}
mOffset = aOffset;
mNumCharsToDelete = aNumCharsToDelete;
#ifdef DEBUG
uint32_t length;
mCharData->GetLength(&length);
NS_ASSERTION(length >= aOffset + aNumCharsToDelete,
"Trying to delete more characters than in node");
#endif
mDeletedText.Truncate();
mRangeUpdater = aRangeUpdater;
return NS_OK;
}
NS_IMETHODIMP
DeleteTextTxn::DoTransaction()
{
MOZ_ASSERT(mEditor && mCharData);
// get the text that we're about to delete
nsresult res = mCharData->SubstringData(mOffset, mNumCharsToDelete,
mDeletedText);
MOZ_ASSERT(NS_SUCCEEDED(res));
res = mCharData->DeleteData(mOffset, mNumCharsToDelete);
NS_ENSURE_SUCCESS(res, res);
if (mRangeUpdater) {
mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete);
}
// only set selection to deletion point if editor gives permission
bool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection) {
nsRefPtr<Selection> selection = mEditor->GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
res = selection->Collapse(mCharData, mOffset);
NS_ASSERTION(NS_SUCCEEDED(res),
"selection could not be collapsed after undo of deletetext.");
NS_ENSURE_SUCCESS(res, res);
}
// 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
DeleteTextTxn::UndoTransaction()
{
MOZ_ASSERT(mEditor && mCharData);
return mCharData->InsertData(mOffset, mDeletedText);
}
NS_IMETHODIMP
DeleteTextTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteTextTxn: ");
aString += mDeletedText;
return NS_OK;
}