gecko/editor/libeditor/base/nsEditorUtils.h
2012-05-21 12:12:37 +01:00

244 lines
6.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsEditorUtils_h__
#define nsEditorUtils_h__
#include "nsCOMPtr.h"
#include "nsIDOMNode.h"
#include "nsISelection.h"
#include "nsIEditor.h"
#include "nsIAtom.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 NS_STACK_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 NS_STACK_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 NS_STACK_CLASS nsAutoRules
{
public:
nsAutoRules(nsEditor *ed, nsEditor::OperationID action,
nsIEditor::EDirection aDirection) :
mEd(ed), mDoNothing(false)
{
if (mEd && !mEd->mAction) // mAction will already be set if this is nested call
{
mEd->StartOperation(action, aDirection);
}
else mDoNothing = true; // nested calls will end up here
}
~nsAutoRules()
{
if (mEd && !mDoNothing)
{
mEd->EndOperation();
}
}
protected:
nsEditor *mEd;
bool mDoNothing;
};
/***************************************************************************
* stack based helper class for turning off active selection adjustment
* by low level transactions
*/
class NS_STACK_CLASS nsAutoTxnsConserveSelection
{
public:
nsAutoTxnsConserveSelection(nsEditor *ed) : mEd(ed), mOldState(true)
{
if (mEd)
{
mOldState = mEd->GetShouldTxnSetSelection();
mEd->SetShouldTxnSetSelection(false);
}
}
~nsAutoTxnsConserveSelection()
{
if (mEd)
{
mEd->SetShouldTxnSetSelection(mOldState);
}
}
protected:
nsEditor *mEd;
bool mOldState;
};
/***************************************************************************
* stack based helper class for batching reflow and paint requests.
*/
class NS_STACK_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 nsBoolDomIterFunctor
{
public:
virtual bool operator()(nsIDOMNode* aNode)=0;
};
class NS_STACK_CLASS nsDOMIterator
{
public:
nsDOMIterator();
virtual ~nsDOMIterator();
nsresult Init(nsIDOMRange* aRange);
nsresult Init(nsIDOMNode* aNode);
nsresult AppendList(nsBoolDomIterFunctor& functor,
nsCOMArray<nsIDOMNode>& arrayOfNodes) const;
protected:
nsCOMPtr<nsIContentIterator> mIter;
};
class nsDOMSubtreeIterator : public nsDOMIterator
{
public:
nsDOMSubtreeIterator();
virtual ~nsDOMSubtreeIterator();
nsresult Init(nsIDOMRange* aRange);
};
class nsTrivialFunctor : public nsBoolDomIterFunctor
{
public:
virtual bool operator()(nsIDOMNode* aNode) // used to build list of all nodes iterator covers
{
return true;
}
};
/******************************************************************************
* general dom point utility struct
*****************************************************************************/
struct NS_STACK_CLASS 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 bool IsDescendantOf(nsIDOMNode *aNode, nsIDOMNode *aParent, PRInt32 *aOffset = 0);
static bool IsLeafNode(nsIDOMNode *aNode);
};
class nsITransferable;
class nsIDOMEvent;
class nsISimpleEnumerator;
class nsEditorHookUtils
{
public:
static bool DoInsertionHook(nsIDOMDocument *aDoc, nsIDOMEvent *aEvent,
nsITransferable *aTrans);
private:
static nsresult GetHookEnumeratorFromDocument(nsIDOMDocument *aDoc,
nsISimpleEnumerator **aEnumerator);
};
#endif // nsEditorUtils_h__