gecko-dev/editor/base/nsEditorUtils.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsEditorUtils_h__
#define nsEditorUtils_h__
#include "nsCOMPtr.h"
#include "nsIDOMNode.h"
#include "nsISelection.h"
#include "nsIEditor.h"
#include "nsIAtom.h"
#include "nsVoidArray.h"
#include "nsEditor.h"
#include "nsIContentIterator.h"
class nsPlaintextEditor;
/***************************************************************************
* stack based helper class for batching a collection of txns inside a
* placeholder txn.
*/
class nsAutoPlaceHolderBatch
{
private:
nsCOMPtr<nsIEditor> mEd;
public:
nsAutoPlaceHolderBatch( nsIEditor *aEd, nsIAtom *atom) : mEd(do_QueryInterface(aEd))
{ if (mEd) mEd->BeginPlaceHolderTransaction(atom); }
~nsAutoPlaceHolderBatch() { if (mEd) mEd->EndPlaceHolderTransaction(); }
};
/***************************************************************************
* stack based helper class for batching a collection of txns.
* Note: I changed this to use placeholder batching so that we get
* proper selection save/restore across undo/redo.
*/
class nsAutoEditBatch : public nsAutoPlaceHolderBatch
{
public:
nsAutoEditBatch( nsIEditor *aEd) : nsAutoPlaceHolderBatch(aEd,nsnull) {}
~nsAutoEditBatch() {}
};
/***************************************************************************
* stack based helper class for saving/restoring selection. Note that this
* assumes that the nodes involved are still around afterwards!
*/
class nsAutoSelectionReset
{
private:
/** ref-counted reference to the selection that we are supposed to restore */
nsCOMPtr<nsISelection> mSel;
nsEditor *mEd; // non-owning ref to nsEditor
public:
/** constructor responsible for remembering all state needed to restore aSel */
nsAutoSelectionReset(nsISelection *aSel, nsEditor *aEd);
/** destructor restores mSel to its former state */
~nsAutoSelectionReset();
/** Abort: cancel selection saver */
void Abort();
};
/***************************************************************************
* stack based helper class for StartOperation()/EndOperation() sandwich
*/
class nsAutoRules
{
public:
nsAutoRules(nsEditor *ed, PRInt32 action, nsIEditor::EDirection aDirection) :
mEd(ed), mDoNothing(PR_FALSE)
{
if (mEd && !mEd->mAction) // mAction will already be set if this is nested call
{
mEd->StartOperation(action, aDirection);
}
else mDoNothing = PR_TRUE; // nested calls will end up here
}
~nsAutoRules()
{
if (mEd && !mDoNothing)
{
mEd->EndOperation();
}
}
protected:
nsEditor *mEd;
PRBool mDoNothing;
};
/***************************************************************************
* stack based helper class for turning off active selection adjustment
* by low level transactions
*/
class nsAutoTxnsConserveSelection
{
public:
nsAutoTxnsConserveSelection(nsEditor *ed) : mEd(ed), mOldState(PR_TRUE)
{
if (mEd)
{
mOldState = mEd->GetShouldTxnSetSelection();
mEd->SetShouldTxnSetSelection(PR_FALSE);
}
}
~nsAutoTxnsConserveSelection()
{
if (mEd)
{
mEd->SetShouldTxnSetSelection(mOldState);
}
}
protected:
nsEditor *mEd;
PRBool mOldState;
};
/***************************************************************************
* stack based helper class for batching reflow and paint requests.
*/
class nsAutoUpdateViewBatch
{
public:
nsAutoUpdateViewBatch(nsEditor *ed) : mEd(ed)
{
NS_ASSERTION(mEd, "null mEd pointer!");
if (mEd)
mEd->BeginUpdateViewBatch();
}
~nsAutoUpdateViewBatch()
{
if (mEd)
mEd->EndUpdateViewBatch();
}
protected:
nsEditor *mEd;
};
/******************************************************************************
* some helper classes for iterating the dom tree
*****************************************************************************/
class nsDomIterFunctor
{
public:
virtual void* operator()(nsIDOMNode* aNode)=0;
};
class nsBoolDomIterFunctor
{
public:
virtual PRBool operator()(nsIDOMNode* aNode)=0;
};
class nsDOMIterator
{
public:
nsDOMIterator();
virtual ~nsDOMIterator();
nsresult Init(nsIDOMRange* aRange);
nsresult Init(nsIDOMNode* aNode);
void ForEach(nsDomIterFunctor& functor) const;
nsresult MakeList(nsBoolDomIterFunctor& functor,
nsCOMPtr<nsISupportsArray> *outArrayOfNodes) const;
nsresult AppendList(nsBoolDomIterFunctor& functor,
nsCOMPtr<nsISupportsArray> arrayOfNodes) const;
protected:
nsCOMPtr<nsIContentIterator> mIter;
};
class nsDOMSubtreeIterator : public nsDOMIterator
{
public:
nsDOMSubtreeIterator();
virtual ~nsDOMSubtreeIterator();
nsresult Init(nsIDOMRange* aRange);
nsresult Init(nsIDOMNode* aNode);
};
class nsTrivialFunctor : public nsBoolDomIterFunctor
{
public:
virtual PRBool operator()(nsIDOMNode* aNode) // used to build list of all nodes iterator covers
{
return PR_TRUE;
}
};
#endif // nsEditorUtils_h__