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298 lines
9.3 KiB
C++
298 lines
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __selectionstate_h__
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#define __selectionstate_h__
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMRange.h"
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#include "nsCycleCollectionParticipant.h"
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class nsIDOMCharacterData;
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class nsISelection;
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class nsRange;
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/***************************************************************************
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* class for recording selection info. stores selection as collection of
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* { {startnode, startoffset} , {endnode, endoffset} } tuples. Can't store
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* ranges since dom gravity will possibly change the ranges.
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*/
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// first a helper struct for saving/setting ranges
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struct nsRangeStore
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{
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nsRangeStore();
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~nsRangeStore();
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nsresult StoreRange(nsIDOMRange *aRange);
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nsresult GetRange(nsRange** outRange);
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nsCOMPtr<nsIDOMNode> startNode;
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PRInt32 startOffset;
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nsCOMPtr<nsIDOMNode> endNode;
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PRInt32 endOffset;
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// DEBUG: static PRInt32 n;
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};
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class nsSelectionState
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{
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public:
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nsSelectionState();
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~nsSelectionState();
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void DoTraverse(nsCycleCollectionTraversalCallback &cb);
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void DoUnlink() { MakeEmpty(); }
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nsresult SaveSelection(nsISelection *aSel);
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nsresult RestoreSelection(nsISelection *aSel);
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bool IsCollapsed();
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bool IsEqual(nsSelectionState *aSelState);
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void MakeEmpty();
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bool IsEmpty();
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protected:
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nsTArray<nsRangeStore> mArray;
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friend class nsRangeUpdater;
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};
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class nsRangeUpdater
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{
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public:
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nsRangeUpdater();
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~nsRangeUpdater();
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void RegisterRangeItem(nsRangeStore *aRangeItem);
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void DropRangeItem(nsRangeStore *aRangeItem);
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nsresult RegisterSelectionState(nsSelectionState &aSelState);
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nsresult DropSelectionState(nsSelectionState &aSelState);
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// editor selection gravity routines. Note that we can't always depend on
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// DOM Range gravity to do what we want to the "real" selection. For instance,
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// if you move a node, that corresponds to deleting it and reinserting it.
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// DOM Range gravity will promote the selection out of the node on deletion,
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// which is not what you want if you know you are reinserting it.
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nsresult SelAdjCreateNode(nsIDOMNode *aParent, PRInt32 aPosition);
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nsresult SelAdjInsertNode(nsIDOMNode *aParent, PRInt32 aPosition);
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nsresult SelAdjDeleteNode(nsIDOMNode *aNode);
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nsresult SelAdjSplitNode(nsIDOMNode *aOldRightNode, PRInt32 aOffset, nsIDOMNode *aNewLeftNode);
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nsresult SelAdjJoinNodes(nsIDOMNode *aLeftNode,
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nsIDOMNode *aRightNode,
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nsIDOMNode *aParent,
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PRInt32 aOffset,
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PRInt32 aOldLeftNodeLength);
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nsresult SelAdjInsertText(nsIDOMCharacterData *aTextNode, PRInt32 aOffset, const nsAString &aString);
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nsresult SelAdjDeleteText(nsIDOMCharacterData *aTextNode, PRInt32 aOffset, PRInt32 aLength);
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// the following gravity routines need will/did sandwiches, because the other gravity
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// routines will be called inside of these sandwiches, but should be ignored.
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nsresult WillReplaceContainer();
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nsresult DidReplaceContainer(nsIDOMNode *aOriginalNode, nsIDOMNode *aNewNode);
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nsresult WillRemoveContainer();
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nsresult DidRemoveContainer(nsIDOMNode *aNode, nsIDOMNode *aParent, PRInt32 aOffset, PRUint32 aNodeOrigLen);
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nsresult WillInsertContainer();
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nsresult DidInsertContainer();
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nsresult WillMoveNode();
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nsresult DidMoveNode(nsIDOMNode *aOldParent, PRInt32 aOldOffset, nsIDOMNode *aNewParent, PRInt32 aNewOffset);
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protected:
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nsTArray<nsRangeStore*> mArray;
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bool mLock;
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};
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/***************************************************************************
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* helper class for using nsSelectionState. stack based class for doing
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* preservation of dom points across editor actions
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*/
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class NS_STACK_CLASS nsAutoTrackDOMPoint
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{
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private:
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nsRangeUpdater &mRU;
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nsCOMPtr<nsIDOMNode> *mNode;
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PRInt32 *mOffset;
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nsRangeStore mRangeItem;
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public:
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nsAutoTrackDOMPoint(nsRangeUpdater &aRangeUpdater, nsCOMPtr<nsIDOMNode> *aNode, PRInt32 *aOffset) :
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mRU(aRangeUpdater)
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,mNode(aNode)
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,mOffset(aOffset)
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{
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mRangeItem.startNode = *mNode;
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mRangeItem.endNode = *mNode;
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mRangeItem.startOffset = *mOffset;
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mRangeItem.endOffset = *mOffset;
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mRU.RegisterRangeItem(&mRangeItem);
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}
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~nsAutoTrackDOMPoint()
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{
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mRU.DropRangeItem(&mRangeItem);
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*mNode = mRangeItem.startNode;
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*mOffset = mRangeItem.startOffset;
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}
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};
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/***************************************************************************
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* another helper class for nsSelectionState. stack based class for doing
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* Will/DidReplaceContainer()
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*/
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class NS_STACK_CLASS nsAutoReplaceContainerSelNotify
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{
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private:
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nsRangeUpdater &mRU;
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nsIDOMNode *mOriginalNode;
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nsIDOMNode *mNewNode;
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public:
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nsAutoReplaceContainerSelNotify(nsRangeUpdater &aRangeUpdater, nsIDOMNode *aOriginalNode, nsIDOMNode *aNewNode) :
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mRU(aRangeUpdater)
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,mOriginalNode(aOriginalNode)
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,mNewNode(aNewNode)
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{
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mRU.WillReplaceContainer();
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}
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~nsAutoReplaceContainerSelNotify()
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{
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mRU.DidReplaceContainer(mOriginalNode, mNewNode);
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}
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};
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/***************************************************************************
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* another helper class for nsSelectionState. stack based class for doing
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* Will/DidRemoveContainer()
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*/
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class NS_STACK_CLASS nsAutoRemoveContainerSelNotify
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{
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private:
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nsRangeUpdater &mRU;
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nsIDOMNode *mNode;
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nsIDOMNode *mParent;
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PRInt32 mOffset;
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PRUint32 mNodeOrigLen;
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public:
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nsAutoRemoveContainerSelNotify(nsRangeUpdater &aRangeUpdater,
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nsIDOMNode *aNode,
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nsIDOMNode *aParent,
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PRInt32 aOffset,
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PRUint32 aNodeOrigLen) :
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mRU(aRangeUpdater)
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,mNode(aNode)
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,mParent(aParent)
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,mOffset(aOffset)
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,mNodeOrigLen(aNodeOrigLen)
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{
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mRU.WillRemoveContainer();
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}
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~nsAutoRemoveContainerSelNotify()
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{
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mRU.DidRemoveContainer(mNode, mParent, mOffset, mNodeOrigLen);
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}
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};
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/***************************************************************************
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* another helper class for nsSelectionState. stack based class for doing
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* Will/DidInsertContainer()
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*/
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class NS_STACK_CLASS nsAutoInsertContainerSelNotify
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{
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private:
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nsRangeUpdater &mRU;
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public:
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nsAutoInsertContainerSelNotify(nsRangeUpdater &aRangeUpdater) :
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mRU(aRangeUpdater)
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{
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mRU.WillInsertContainer();
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}
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~nsAutoInsertContainerSelNotify()
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{
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mRU.DidInsertContainer();
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}
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};
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/***************************************************************************
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* another helper class for nsSelectionState. stack based class for doing
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* Will/DidMoveNode()
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*/
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class NS_STACK_CLASS nsAutoMoveNodeSelNotify
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{
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private:
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nsRangeUpdater &mRU;
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nsIDOMNode *mOldParent;
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nsIDOMNode *mNewParent;
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PRInt32 mOldOffset;
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PRInt32 mNewOffset;
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public:
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nsAutoMoveNodeSelNotify(nsRangeUpdater &aRangeUpdater,
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nsIDOMNode *aOldParent,
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PRInt32 aOldOffset,
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nsIDOMNode *aNewParent,
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PRInt32 aNewOffset) :
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mRU(aRangeUpdater)
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,mOldParent(aOldParent)
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,mNewParent(aNewParent)
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,mOldOffset(aOldOffset)
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,mNewOffset(aNewOffset)
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{
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mRU.WillMoveNode();
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}
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~nsAutoMoveNodeSelNotify()
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{
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mRU.DidMoveNode(mOldParent, mOldOffset, mNewParent, mNewOffset);
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}
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};
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#endif
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