michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "DeleteTextTxn.h"
michael@0: #include "mozilla/Assertions.h"
michael@0: #include "mozilla/dom/Selection.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "nsDebug.h"
michael@0: #include "nsEditor.h"
michael@0: #include "nsError.h"
michael@0: #include "nsIEditor.h"
michael@0: #include "nsISelection.h"
michael@0: #include "nsISupportsImpl.h"
michael@0: #include "nsSelectionState.h"
michael@0: #include "nsAString.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::dom;
michael@0: 
michael@0: DeleteTextTxn::DeleteTextTxn() :
michael@0:   EditTxn(),
michael@0:   mEditor(nullptr),
michael@0:   mCharData(),
michael@0:   mOffset(0),
michael@0:   mNumCharsToDelete(0),
michael@0:   mRangeUpdater(nullptr)
michael@0: {
michael@0: }
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTxn, EditTxn,
michael@0:                                    mCharData)
michael@0: 
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTxn)
michael@0: NS_INTERFACE_MAP_END_INHERITING(EditTxn)
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteTextTxn::Init(nsEditor* aEditor,
michael@0:                     nsIDOMCharacterData* aCharData,
michael@0:                     uint32_t aOffset,
michael@0:                     uint32_t aNumCharsToDelete,
michael@0:                     nsRangeUpdater* aRangeUpdater)
michael@0: {
michael@0:   MOZ_ASSERT(aEditor && aCharData);
michael@0: 
michael@0:   mEditor = aEditor;
michael@0:   mCharData = aCharData;
michael@0: 
michael@0:   // do nothing if the node is read-only
michael@0:   if (!mEditor->IsModifiableNode(mCharData)) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   mOffset = aOffset;
michael@0:   mNumCharsToDelete = aNumCharsToDelete;
michael@0: #ifdef DEBUG
michael@0:   uint32_t length;
michael@0:   mCharData->GetLength(&length);
michael@0:   NS_ASSERTION(length >= aOffset + aNumCharsToDelete,
michael@0:                "Trying to delete more characters than in node");
michael@0: #endif
michael@0:   mDeletedText.Truncate();
michael@0:   mRangeUpdater = aRangeUpdater;
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteTextTxn::DoTransaction()
michael@0: {
michael@0:   MOZ_ASSERT(mEditor && mCharData);
michael@0: 
michael@0:   // get the text that we're about to delete
michael@0:   nsresult res = mCharData->SubstringData(mOffset, mNumCharsToDelete,
michael@0:                                           mDeletedText);
michael@0:   MOZ_ASSERT(NS_SUCCEEDED(res));
michael@0:   res = mCharData->DeleteData(mOffset, mNumCharsToDelete);
michael@0:   NS_ENSURE_SUCCESS(res, res);
michael@0: 
michael@0:   if (mRangeUpdater) {
michael@0:     mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete);
michael@0:   }
michael@0: 
michael@0:   // only set selection to deletion point if editor gives permission
michael@0:   bool bAdjustSelection;
michael@0:   mEditor->ShouldTxnSetSelection(&bAdjustSelection);
michael@0:   if (bAdjustSelection) {
michael@0:     nsRefPtr<Selection> selection = mEditor->GetSelection();
michael@0:     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
michael@0:     res = selection->Collapse(mCharData, mOffset);
michael@0:     NS_ASSERTION(NS_SUCCEEDED(res),
michael@0:                  "selection could not be collapsed after undo of deletetext.");
michael@0:     NS_ENSURE_SUCCESS(res, res);
michael@0:   }
michael@0:   // else do nothing - dom range gravity will adjust selection
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: //XXX: we may want to store the selection state and restore it properly
michael@0: //     was it an insertion point or an extended selection?
michael@0: NS_IMETHODIMP
michael@0: DeleteTextTxn::UndoTransaction()
michael@0: {
michael@0:   MOZ_ASSERT(mEditor && mCharData);
michael@0: 
michael@0:   return mCharData->InsertData(mOffset, mDeletedText);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteTextTxn::GetTxnDescription(nsAString& aString)
michael@0: {
michael@0:   aString.AssignLiteral("DeleteTextTxn: ");
michael@0:   aString += mDeletedText;
michael@0:   return NS_OK;
michael@0: }