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