RetroZilla/editor/libeditor/base/nsEditorUtils.h
2015-10-20 23:03:22 -04:00

290 lines
8.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
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* ***** END LICENSE BLOCK ***** */
#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"
#include "nsCOMArray.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 AppendList(nsBoolDomIterFunctor& functor,
nsCOMArray<nsIDOMNode>& 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;
}
};
/******************************************************************************
* general dom point utility struct
*****************************************************************************/
struct DOMPoint
{
nsCOMPtr<nsIDOMNode> node;
PRInt32 offset;
DOMPoint() : node(0),offset(0) {}
DOMPoint(nsIDOMNode *aNode, PRInt32 aOffset) :
node(aNode),offset(aOffset) {}
void SetPoint(nsIDOMNode *aNode, PRInt32 aOffset)
{
node = aNode; offset = aOffset;
}
void GetPoint(nsCOMPtr<nsIDOMNode> &aNode, PRInt32 &aOffset)
{
aNode = node; aOffset = offset;
}
};
class nsEditorUtils
{
public:
static PRBool IsDescendantOf(nsIDOMNode *aNode, nsIDOMNode *aParent, PRInt32 *aOffset = 0);
static PRBool IsLeafNode(nsIDOMNode *aNode);
};
class nsIDragSession;
class nsITransferable;
class nsIDOMEvent;
class nsISimpleEnumerator;
class nsEditorHookUtils
{
public:
static PRBool DoAllowDragHook(nsIDOMDocument *aDoc, nsIDOMEvent *aEvent);
static PRBool DoDragHook(nsIDOMDocument *aDoc, nsIDOMEvent *aEvent,
nsITransferable *aTrans);
static PRBool DoAllowDropHook(nsIDOMDocument *aDoc, nsIDOMEvent *aEvent,
nsIDragSession *aSession);
static PRBool DoInsertionHook(nsIDOMDocument *aDoc, nsIDOMEvent *aEvent,
nsITransferable *aTrans);
private:
static nsresult GetHookEnumeratorFromDocument(nsIDOMDocument *aDoc,
nsISimpleEnumerator **aEnumerator);
};
#endif // nsEditorUtils_h__