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133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsEditorUtils_h__
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#define nsEditorUtils_h__
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#include "nsCOMPtr.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMSelection.h"
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#include "nsIEditor.h"
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#include "nsIAtom.h"
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#include "nsVoidArray.h"
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#include "nsEditor.h"
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/***************************************************************************
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* stack based helper class for batching a collection of txns inside a
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* placeholder txn.
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*/
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class nsAutoPlaceHolderBatch
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{
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private:
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nsCOMPtr<nsIEditor> mEd;
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public:
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nsAutoPlaceHolderBatch( nsIEditor *aEd, nsIAtom *atom) : mEd(do_QueryInterface(aEd))
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{ if (mEd) mEd->BeginPlaceHolderTransaction(atom); }
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~nsAutoPlaceHolderBatch() { if (mEd) mEd->EndPlaceHolderTransaction(); }
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};
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/***************************************************************************
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* stack based helper class for batching a collection of txns.
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* Note: I changed this to use placeholder batching so that we get
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* proper selection save/restore across undo/redo.
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*/
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class nsAutoEditBatch : public nsAutoPlaceHolderBatch
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{
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public:
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nsAutoEditBatch( nsIEditor *aEd) : nsAutoPlaceHolderBatch(aEd,nsnull) {}
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~nsAutoEditBatch() {}
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};
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/***************************************************************************
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* stack based helper class for saving/restoring selection. Note that this
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* assumes that the nodes involved are still around afterwards!
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*/
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class nsAutoSelectionReset
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{
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private:
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/** ref-counted reference to the selection that we are supposed to restore */
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nsCOMPtr<nsIDOMSelection> mSel;
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nsEditor *mEd; // non-owning ref to nsEditor
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public:
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/** constructor responsible for remembering all state needed to restore aSel */
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nsAutoSelectionReset(nsIDOMSelection *aSel, nsEditor *aEd);
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/** destructor restores mSel to its former state */
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~nsAutoSelectionReset();
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};
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/***************************************************************************
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* stack based helper class for StartOperation()/EndOperation() sandwich
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*/
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class nsAutoRules
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{
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public:
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nsAutoRules(nsEditor *ed, PRInt32 action, nsIEditor::EDirection aDirection) :
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mEd(ed), mAction(action), mDirection(aDirection)
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{if (mEd) mEd->StartOperation(mAction, mDirection);}
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~nsAutoRules() {if (mEd) mEd->EndOperation(mAction, mDirection);}
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protected:
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nsEditor *mEd;
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PRInt32 mAction;
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nsIEditor::EDirection mDirection;
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};
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/***************************************************************************
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* stack based helper class for turning off active selection adjustment
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* by low level transactions
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*/
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class nsAutoTxnsConserveSelection
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{
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public:
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nsAutoTxnsConserveSelection(nsEditor *ed) : mEd(ed), mOldState(PR_TRUE)
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{
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if (mEd)
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{
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mOldState = mEd->GetShouldTxnSetSelection();
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mEd->SetShouldTxnSetSelection(PR_FALSE);
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}
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}
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~nsAutoTxnsConserveSelection()
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{
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if (mEd)
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{
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mEd->SetShouldTxnSetSelection(mOldState);
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}
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}
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protected:
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nsEditor *mEd;
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PRBool mOldState;
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};
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#endif // nsEditorUtils_h__
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