gecko/editor/libeditor/base/nsSelectionState.cpp

712 lines
19 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* 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
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSelectionState.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMNode.h"
#include "nsIDOMRange.h"
#include "nsISelection.h"
#include "nsEditor.h"
#include "nsEditorUtils.h"
/***************************************************************************
* class for recording selection info. stores selection as collection of
* { {startnode, startoffset} , {endnode, endoffset} } tuples. Can't store
* ranges since dom gravity will possibly change the ranges.
*/
nsSelectionState::nsSelectionState() : mArray(){}
nsSelectionState::~nsSelectionState()
{
MakeEmpty();
}
nsresult
nsSelectionState::SaveSelection(nsISelection *aSel)
{
if (!aSel) return NS_ERROR_NULL_POINTER;
PRInt32 i,rangeCount, arrayCount = mArray.Count();
aSel->GetRangeCount(&rangeCount);
nsRangeStore *item;
// if we need more items in the array, new them
if (arrayCount<rangeCount)
{
PRInt32 count = rangeCount-arrayCount;
for (i=0; i<count; i++)
{
item = new nsRangeStore;
mArray.AppendElement(item);
}
}
// else if we have too many, delete them
else if (arrayCount>rangeCount)
{
for (i = arrayCount-1; i >= rangeCount; i--)
{
item = (nsRangeStore*)mArray.ElementAt(i);
delete item;
mArray.RemoveElementAt(i);
}
}
// now store the selection ranges
nsresult res = NS_OK;
for (i=0; i<rangeCount; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDOMRange> range;
res = aSel->GetRangeAt(i, getter_AddRefs(range));
item->StoreRange(range);
}
return res;
}
nsresult
nsSelectionState::RestoreSelection(nsISelection *aSel)
{
if (!aSel) return NS_ERROR_NULL_POINTER;
nsresult res;
PRInt32 i, arrayCount = mArray.Count();
nsRangeStore *item;
// clear out selection
aSel->RemoveAllRanges();
// set the selection ranges anew
for (i=0; i<arrayCount; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDOMRange> range;
item->GetRange(address_of(range));
if (!range) return NS_ERROR_UNEXPECTED;
res = aSel->AddRange(range);
if(NS_FAILED(res)) return res;
}
return NS_OK;
}
PRBool
nsSelectionState::IsCollapsed()
{
if (1 != mArray.Count()) return PR_FALSE;
nsRangeStore *item;
item = (nsRangeStore*)mArray.ElementAt(0);
if (!item) return PR_FALSE;
nsCOMPtr<nsIDOMRange> range;
item->GetRange(address_of(range));
if (!range) return PR_FALSE;
PRBool bIsCollapsed;
range->GetCollapsed(&bIsCollapsed);
return bIsCollapsed;
}
PRBool
nsSelectionState::IsEqual(nsSelectionState *aSelState)
{
if (!aSelState) return NS_ERROR_NULL_POINTER;
PRInt32 i, myCount = mArray.Count(), itsCount = aSelState->mArray.Count();
if (myCount != itsCount) return PR_FALSE;
if (myCount < 1) return PR_FALSE;
nsRangeStore *myItem, *itsItem;
for (i=0; i<myCount; i++)
{
myItem = (nsRangeStore*)mArray.ElementAt(i);
itsItem = (nsRangeStore*)(aSelState->mArray.ElementAt(i));
if (!myItem || !itsItem) return PR_FALSE;
nsCOMPtr<nsIDOMRange> myRange, itsRange;
myItem->GetRange(address_of(myRange));
itsItem->GetRange(address_of(itsRange));
if (!myRange || !itsRange) return PR_FALSE;
PRInt16 compResult;
myRange->CompareBoundaryPoints(nsIDOMRange::START_TO_START, itsRange, &compResult);
if (compResult) return PR_FALSE;
myRange->CompareBoundaryPoints(nsIDOMRange::END_TO_END, itsRange, &compResult);
if (compResult) return PR_FALSE;
}
// if we got here, they are equal
return PR_TRUE;
}
void
nsSelectionState::MakeEmpty()
{
// free any items in the array
nsRangeStore *item;
for (PRInt32 i = mArray.Count()-1; i >= 0; --i)
{
item = (nsRangeStore*)mArray.ElementAt(i);
delete item;
}
mArray.Clear();
}
PRBool
nsSelectionState::IsEmpty()
{
return (mArray.Count() == 0);
}
/***************************************************************************
* nsRangeUpdater: class for updating nsIDOMRanges in response to editor actions.
*/
nsRangeUpdater::nsRangeUpdater() : mArray(), mLock(PR_FALSE) {}
nsRangeUpdater::~nsRangeUpdater()
{
// nothing to do, we don't own the items in our array.
}
void
nsRangeUpdater::RegisterRangeItem(nsRangeStore *aRangeItem)
{
if (!aRangeItem) return;
if (mArray.IndexOf(aRangeItem) != -1)
{
NS_ERROR("tried to register an already registered range");
return; // don't register it again. It would get doubly adjusted.
}
mArray.AppendElement(aRangeItem);
}
void
nsRangeUpdater::DropRangeItem(nsRangeStore *aRangeItem)
{
if (!aRangeItem) return;
mArray.RemoveElement(aRangeItem);
}
nsresult
nsRangeUpdater::RegisterSelectionState(nsSelectionState &aSelState)
{
PRInt32 i, theCount = aSelState.mArray.Count();
if (theCount < 1) return NS_ERROR_FAILURE;
nsRangeStore *item;
for (i=0; i<theCount; i++)
{
item = (nsRangeStore*)aSelState.mArray.ElementAt(i);
RegisterRangeItem(item);
}
return NS_OK;
}
nsresult
nsRangeUpdater::DropSelectionState(nsSelectionState &aSelState)
{
PRInt32 i, theCount = aSelState.mArray.Count();
if (theCount < 1) return NS_ERROR_FAILURE;
nsRangeStore *item;
for (i=0; i<theCount; i++)
{
item = (nsRangeStore*)aSelState.mArray.ElementAt(i);
DropRangeItem(item);
}
return NS_OK;
}
// gravity methods:
nsresult
nsRangeUpdater::SelAdjCreateNode(nsIDOMNode *aParent, PRInt32 aPosition)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
if (!aParent) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if ((item->startNode.get() == aParent) && (item->startOffset > aPosition))
item->startOffset++;
if ((item->endNode.get() == aParent) && (item->endOffset > aPosition))
item->endOffset++;
}
return NS_OK;
}
nsresult
nsRangeUpdater::SelAdjInsertNode(nsIDOMNode *aParent, PRInt32 aPosition)
{
return SelAdjCreateNode(aParent, aPosition);
}
nsresult
nsRangeUpdater::SelAdjDeleteNode(nsIDOMNode *aNode)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
if (!aNode) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset = 0;
nsresult res = nsEditor::GetNodeLocation(aNode, address_of(parent), &offset);
NS_ENSURE_SUCCESS(res, res);
// check for range endpoints that are after aNode and in the same parent
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if ((item->startNode.get() == parent) && (item->startOffset > offset))
item->startOffset--;
if ((item->endNode.get() == parent) && (item->endOffset > offset))
item->endOffset--;
// check for range endpoints that are in aNode
if (item->startNode == aNode)
{
item->startNode = parent;
item->startOffset = offset;
}
if (item->endNode == aNode)
{
item->endNode = parent;
item->endOffset = offset;
}
// check for range endpoints that are in descendants of aNode
nsCOMPtr<nsIDOMNode> oldStart;
if (nsEditorUtils::IsDescendantOf(item->startNode, aNode))
{
oldStart = item->startNode; // save for efficiency hack below.
item->startNode = parent;
item->startOffset = offset;
}
// avoid having to call IsDescendantOf() for common case of range startnode == range endnode.
if ((item->endNode == oldStart) || nsEditorUtils::IsDescendantOf(item->endNode, aNode))
{
item->endNode = parent;
item->endOffset = offset;
}
}
return NS_OK;
}
nsresult
nsRangeUpdater::SelAdjSplitNode(nsIDOMNode *aOldRightNode, PRInt32 aOffset, nsIDOMNode *aNewLeftNode)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
if (!aOldRightNode || !aNewLeftNode) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset;
nsresult result = nsEditor::GetNodeLocation(aOldRightNode, address_of(parent), &offset);
if (NS_FAILED(result)) return result;
// first part is same as inserting aNewLeftnode
result = SelAdjInsertNode(parent,offset-1);
if (NS_FAILED(result)) return result;
// next step is to check for range enpoints inside aOldRightNode
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if (item->startNode.get() == aOldRightNode)
{
if (item->startOffset > aOffset)
{
item->startOffset -= aOffset;
}
else
{
item->startNode = aNewLeftNode;
}
}
if (item->endNode.get() == aOldRightNode)
{
if (item->endOffset > aOffset)
{
item->endOffset -= aOffset;
}
else
{
item->endNode = aNewLeftNode;
}
}
}
return NS_OK;
}
nsresult
nsRangeUpdater::SelAdjJoinNodes(nsIDOMNode *aLeftNode,
nsIDOMNode *aRightNode,
nsIDOMNode *aParent,
PRInt32 aOffset,
PRInt32 aOldLeftNodeLength)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
if (!aLeftNode || !aRightNode || !aParent) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if (item->startNode.get() == aParent)
{
// adjust start point in aParent
if (item->startOffset > aOffset)
{
item->startOffset--;
}
else if (item->startOffset == aOffset)
{
// join keeps right hand node
item->startNode = aRightNode;
item->startOffset = aOldLeftNodeLength;
}
}
else if (item->startNode.get() == aRightNode)
{
// adjust start point in aRightNode
item->startOffset += aOldLeftNodeLength;
}
else if (item->startNode.get() == aLeftNode)
{
// adjust start point in aLeftNode
item->startNode = aRightNode;
}
if (item->endNode.get() == aParent)
{
// adjust end point in aParent
if (item->endOffset > aOffset)
{
item->endOffset--;
}
else if (item->endOffset == aOffset)
{
// join keeps right hand node
item->endNode = aRightNode;
item->endOffset = aOldLeftNodeLength;
}
}
else if (item->endNode.get() == aRightNode)
{
// adjust end point in aRightNode
item->endOffset += aOldLeftNodeLength;
}
else if (item->endNode.get() == aLeftNode)
{
// adjust end point in aLeftNode
item->endNode = aRightNode;
}
}
return NS_OK;
}
nsresult
nsRangeUpdater::SelAdjInsertText(nsIDOMCharacterData *aTextNode, PRInt32 aOffset, const nsAString &aString)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
PRInt32 count = mArray.Count();
if (!count) return NS_OK;
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(aTextNode));
if (!node) return NS_ERROR_NULL_POINTER;
PRInt32 len=aString.Length(), i;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if ((item->startNode.get() == node) && (item->startOffset > aOffset))
item->startOffset += len;
if ((item->endNode.get() == node) && (item->endOffset > aOffset))
item->endOffset += len;
}
return NS_OK;
}
nsresult
nsRangeUpdater::SelAdjDeleteText(nsIDOMCharacterData *aTextNode, PRInt32 aOffset, PRInt32 aLength)
{
if (mLock) return NS_OK; // lock set by Will/DidReplaceParent, etc...
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(aTextNode));
if (!node) return NS_ERROR_NULL_POINTER;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if ((item->startNode.get() == node) && (item->startOffset > aOffset))
{
item->startOffset -= aLength;
if (item->startOffset < 0) item->startOffset = 0;
}
if ((item->endNode.get() == node) && (item->endOffset > aOffset))
{
item->endOffset -= aLength;
if (item->endOffset < 0) item->endOffset = 0;
}
}
return NS_OK;
}
nsresult
nsRangeUpdater::WillReplaceContainer()
{
if (mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_TRUE;
return NS_OK;
}
nsresult
nsRangeUpdater::DidReplaceContainer(nsIDOMNode *aOriginalNode, nsIDOMNode *aNewNode)
{
if (!mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_FALSE;
if (!aOriginalNode || !aNewNode) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if (item->startNode.get() == aOriginalNode)
item->startNode = aNewNode;
if (item->endNode.get() == aOriginalNode)
item->endNode = aNewNode;
}
return NS_OK;
}
nsresult
nsRangeUpdater::WillRemoveContainer()
{
if (mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_TRUE;
return NS_OK;
}
nsresult
nsRangeUpdater::DidRemoveContainer(nsIDOMNode *aNode, nsIDOMNode *aParent, PRInt32 aOffset, PRUint32 aNodeOrigLen)
{
if (!mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_FALSE;
if (!aNode || !aParent) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
if (item->startNode.get() == aNode)
{
item->startNode = aParent;
item->startOffset += aOffset;
}
else if ((item->startNode.get() == aParent) && (item->startOffset > aOffset))
item->startOffset += (PRInt32)aNodeOrigLen-1;
if (item->endNode.get() == aNode)
{
item->endNode = aParent;
item->endOffset += aOffset;
}
else if ((item->endNode.get() == aParent) && (item->endOffset > aOffset))
item->endOffset += (PRInt32)aNodeOrigLen-1;
}
return NS_OK;
}
nsresult
nsRangeUpdater::WillInsertContainer()
{
if (mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_TRUE;
return NS_OK;
}
nsresult
nsRangeUpdater::DidInsertContainer()
{
if (!mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_FALSE;
return NS_OK;
}
nsresult
nsRangeUpdater::WillMoveNode()
{
if (mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_TRUE;
return NS_OK;
}
nsresult
nsRangeUpdater::DidMoveNode(nsIDOMNode *aOldParent, PRInt32 aOldOffset, nsIDOMNode *aNewParent, PRInt32 aNewOffset)
{
if (!mLock) return NS_ERROR_UNEXPECTED;
mLock = PR_FALSE;
if (!aOldParent || !aNewParent) return NS_ERROR_NULL_POINTER;
PRInt32 i, count = mArray.Count();
if (!count) return NS_OK;
nsRangeStore *item;
for (i=0; i<count; i++)
{
item = (nsRangeStore*)mArray.ElementAt(i);
if (!item) return NS_ERROR_NULL_POINTER;
// like a delete in aOldParent
if ((item->startNode.get() == aOldParent) && (item->startOffset > aOldOffset))
item->startOffset--;
if ((item->endNode.get() == aOldParent) && (item->endOffset > aOldOffset))
item->endOffset--;
// and like an insert in aNewParent
if ((item->startNode.get() == aNewParent) && (item->startOffset > aNewOffset))
item->startOffset++;
if ((item->endNode.get() == aNewParent) && (item->endOffset > aNewOffset))
item->endOffset++;
}
return NS_OK;
}
/***************************************************************************
* helper class for nsSelectionState. nsRangeStore stores range endpoints.
*/
// DEBUG: PRInt32 nsRangeStore::n = 0;
nsRangeStore::nsRangeStore()
{
// DEBUG: n++; printf("range store alloc count=%d\n", n);
}
nsRangeStore::~nsRangeStore()
{
// DEBUG: n--; printf("range store alloc count=%d\n", n);
}
nsresult nsRangeStore::StoreRange(nsIDOMRange *aRange)
{
if (!aRange) return NS_ERROR_NULL_POINTER;
aRange->GetStartContainer(getter_AddRefs(startNode));
aRange->GetEndContainer(getter_AddRefs(endNode));
aRange->GetStartOffset(&startOffset);
aRange->GetEndOffset(&endOffset);
return NS_OK;
}
nsresult nsRangeStore::GetRange(nsCOMPtr<nsIDOMRange> *outRange)
{
if (!outRange) return NS_ERROR_NULL_POINTER;
nsresult res;
*outRange = do_CreateInstance("@mozilla.org/content/range;1", &res);
if(NS_FAILED(res)) return res;
res = (*outRange)->SetStart(startNode, startOffset);
if(NS_FAILED(res)) return res;
res = (*outRange)->SetEnd(endNode, endOffset);
return res;
}