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https://github.com/mozilla/gecko-dev.git
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3bc5912284
Added some comments of the form "// XXX: ERROR_HANDLING <explanation>" wherever I saw a potential error but wasn't 100% sure of the intention of the code. Fixed a few bugs along the way.
359 lines
10 KiB
C++
359 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "DeleteRangeTxn.h"
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#include "nsIDOMRange.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMSelection.h"
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#include "DeleteTextTxn.h"
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#include "DeleteElementTxn.h"
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#include "TransactionFactory.h"
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#include "nsIContentIterator.h"
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#include "nsIContent.h"
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#include "nsLayoutCID.h"
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#ifdef NS_DEBUG
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#include "nsIDOMElement.h"
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#endif
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#ifdef NS_DEBUG
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static PRBool gNoisy = PR_FALSE;
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#else
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static const PRBool gNoisy = PR_FALSE;
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#endif
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// note that aEditor is not refcounted
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DeleteRangeTxn::DeleteRangeTxn()
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: EditAggregateTxn()
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{
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}
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NS_IMETHODIMP DeleteRangeTxn::Init(nsIEditor *aEditor, nsIDOMRange *aRange)
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{
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NS_ASSERTION(aEditor && aRange, "bad state");
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if (!aEditor || !aRange) { return NS_ERROR_NOT_INITIALIZED; }
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mEditor = aEditor;
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mRange = do_QueryInterface(aRange);
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nsresult result = aRange->GetStartParent(getter_AddRefs(mStartParent));
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NS_ASSERTION((NS_SUCCEEDED(result)), "GetStartParent failed.");
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result = aRange->GetEndParent(getter_AddRefs(mEndParent));
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NS_ASSERTION((NS_SUCCEEDED(result)), "GetEndParent failed.");
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result = aRange->GetStartOffset(&mStartOffset);
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NS_ASSERTION((NS_SUCCEEDED(result)), "GetStartOffset failed.");
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result = aRange->GetEndOffset(&mEndOffset);
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NS_ASSERTION((NS_SUCCEEDED(result)), "GetEndOffset failed.");
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result = aRange->GetCommonParent(getter_AddRefs(mCommonParent));
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NS_ASSERTION((NS_SUCCEEDED(result)), "GetCommonParent failed.");
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#ifdef NS_DEBUG
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{
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PRUint32 count;
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nsCOMPtr<nsIDOMCharacterData> textNode;
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textNode = do_QueryInterface(mStartParent);
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if (textNode)
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textNode->GetLength(&count);
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else
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{
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nsCOMPtr<nsIDOMNodeList> children;
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result = mStartParent->GetChildNodes(getter_AddRefs(children));
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NS_ASSERTION(((NS_SUCCEEDED(result)) && children), "bad start child list");
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children->GetLength(&count);
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}
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NS_ASSERTION(mStartOffset<=(PRInt32)count, "bad start offset");
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textNode = do_QueryInterface(mEndParent);
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if (textNode)
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textNode->GetLength(&count);
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else
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{
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nsCOMPtr<nsIDOMNodeList> children;
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result = mEndParent->GetChildNodes(getter_AddRefs(children));
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NS_ASSERTION(((NS_SUCCEEDED(result)) && children), "bad end child list");
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children->GetLength(&count);
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}
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NS_ASSERTION(mEndOffset<=(PRInt32)count, "bad end offset");
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if (gNoisy)
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{
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printf ("DeleteRange: %d of %p to %d of %p\n",
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mStartOffset, (void *)mStartParent, mEndOffset, (void *)mEndParent);
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}
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}
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#endif
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return result;
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}
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DeleteRangeTxn::~DeleteRangeTxn()
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{
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}
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NS_IMETHODIMP DeleteRangeTxn::Do(void)
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{
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if (gNoisy) { printf("Do Delete Range\n"); }
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if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult result;
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// build the child transactions
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if (mStartParent==mEndParent)
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{ // the selection begins and ends in the same node
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result = CreateTxnsToDeleteBetween(mStartParent, mStartOffset, mEndOffset);
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}
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else
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{ // the selection ends in a different node from where it started
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// delete the relevant content in the start node
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result = CreateTxnsToDeleteContent(mStartParent, mStartOffset, nsIEditor::eDeleteNext);
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if (NS_SUCCEEDED(result))
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{
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// delete the intervening nodes
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result = CreateTxnsToDeleteNodesBetween();
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if (NS_SUCCEEDED(result))
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{
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// delete the relevant content in the end node
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result = CreateTxnsToDeleteContent(mEndParent, mEndOffset, nsIEditor::eDeletePrevious);
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}
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}
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}
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// if we've successfully built this aggregate transaction, then do it.
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if (NS_SUCCEEDED(result)) {
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result = EditAggregateTxn::Do();
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}
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if (NS_SUCCEEDED(result)) {
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// set the resulting selection
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nsCOMPtr<nsIDOMSelection> selection;
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result = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(result)) return result;
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if (!selection) return NS_ERROR_NULL_POINTER;
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result = selection->Collapse(mStartParent, mStartOffset);
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}
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return result;
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}
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NS_IMETHODIMP DeleteRangeTxn::Undo(void)
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{
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if (gNoisy) { printf("Undo Delete Range\n"); }
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if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult result = EditAggregateTxn::Undo();
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if (NS_SUCCEEDED(result))
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{
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// set the resulting selection
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nsCOMPtr<nsIDOMSelection> selection;
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result = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(result)) return result;
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if (!selection) return NS_ERROR_NULL_POINTER;
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result = selection->Collapse(mStartParent, mStartOffset);
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if (NS_FAILED(result)) return result;
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result = selection->Extend(mEndParent, mEndOffset);
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}
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return result;
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}
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NS_IMETHODIMP DeleteRangeTxn::Redo(void)
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{
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if (gNoisy) { printf("Redo Delete Range\n"); }
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if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult result = EditAggregateTxn::Redo();
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if (NS_SUCCEEDED(result)) {
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// set the resulting selection
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nsCOMPtr<nsIDOMSelection> selection;
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result = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(result)) return result;
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if (!selection) return NS_ERROR_NULL_POINTER;
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result = selection->Collapse(mStartParent, mStartOffset);
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}
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return result;
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}
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NS_IMETHODIMP DeleteRangeTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP DeleteRangeTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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NS_IMETHODIMP DeleteRangeTxn::GetUndoString(nsString *aString)
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{
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if (nsnull!=aString)
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{
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*aString="Insert Range: ";
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeleteRangeTxn::GetRedoString(nsString *aString)
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{
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if (nsnull!=aString)
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{
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*aString="Remove Range: ";
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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DeleteRangeTxn::CreateTxnsToDeleteBetween(nsIDOMNode *aStartParent,
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PRUint32 aStartOffset,
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PRUint32 aEndOffset)
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{
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nsresult result;
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// see what kind of node we have
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nsCOMPtr<nsIDOMCharacterData> textNode;
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textNode = do_QueryInterface(aStartParent);
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if (textNode)
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{ // if the node is a text node, then delete text content
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DeleteTextTxn *txn;
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result = TransactionFactory::GetNewTransaction(DeleteTextTxn::GetCID(), (EditTxn **)&txn);
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if (NS_FAILED(result)) return result;
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if (!txn) return NS_ERROR_NULL_POINTER;
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PRInt32 numToDel;
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if (aStartOffset==aEndOffset)
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numToDel = 1;
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else
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numToDel = aEndOffset-aStartOffset;
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txn->Init(mEditor, textNode, aStartOffset, numToDel);
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AppendChild(txn);
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}
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else
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{
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PRUint32 childCount;
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nsCOMPtr<nsIDOMNodeList> children;
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result = aStartParent->GetChildNodes(getter_AddRefs(children));
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if (NS_FAILED(result)) return result;
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if (!children) return NS_ERROR_NULL_POINTER;
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children->GetLength(&childCount);
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NS_ASSERTION(aEndOffset<=childCount, "bad aEndOffset");
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PRUint32 i;
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for (i=aStartOffset; i<aEndOffset; i++)
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{
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nsCOMPtr<nsIDOMNode> child;
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result = children->Item(i, getter_AddRefs(child));
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if (NS_FAILED(result)) return result;
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if (!child) return NS_ERROR_NULL_POINTER;
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DeleteElementTxn *txn;
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result = TransactionFactory::GetNewTransaction(DeleteElementTxn::GetCID(), (EditTxn **)&txn);
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if (NS_FAILED(result)) return result;
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if (!txn) return NS_ERROR_NULL_POINTER;
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txn->Init(child);
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AppendChild(txn);
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}
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}
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return result;
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}
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NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteContent(nsIDOMNode *aParent,
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PRUint32 aOffset,
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nsIEditor::ESelectionCollapseDirection aAction)
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{
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nsresult result;
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// see what kind of node we have
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nsCOMPtr<nsIDOMCharacterData> textNode;
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textNode = do_QueryInterface(aParent);
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if (textNode)
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{ // if the node is a text node, then delete text content
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PRUint32 start, numToDelete;
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if (nsIEditor::eDeleteNext == aAction)
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{
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start=aOffset;
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textNode->GetLength(&numToDelete);
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numToDelete -= aOffset;
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}
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else
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{
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start=0;
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numToDelete=aOffset;
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}
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if (numToDelete)
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{
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DeleteTextTxn *txn;
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result = TransactionFactory::GetNewTransaction(DeleteTextTxn::GetCID(), (EditTxn **)&txn);
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if (NS_FAILED(result)) return result;
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if (!txn) return NS_ERROR_NULL_POINTER;
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txn->Init(mEditor, textNode, start, numToDelete);
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AppendChild(txn);
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}
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}
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return result;
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}
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static NS_DEFINE_IID(kSubtreeIteratorCID, NS_SUBTREEITERATOR_CID);
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static NS_DEFINE_IID(kRangeCID, NS_RANGE_CID);
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NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteNodesBetween()
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{
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nsresult result;
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nsCOMPtr<nsIContentIterator> iter;
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result = nsComponentManager::CreateInstance(kSubtreeIteratorCID,
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nsnull,
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nsIContentIterator::GetIID(),
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getter_AddRefs(iter));
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if (NS_FAILED(result)) return result;
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if (!iter) return NS_ERROR_NULL_POINTER;
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result = iter->Init(mRange);
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if (NS_FAILED(result)) return result;
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while (NS_COMFALSE == iter->IsDone())
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{
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nsCOMPtr<nsIDOMNode> node;
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nsCOMPtr<nsIContent> content;
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result = iter->CurrentNode(getter_AddRefs(content));
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node = do_QueryInterface(content);
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if (NS_FAILED(result)) return result;
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if (!node) return NS_ERROR_NULL_POINTER;
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DeleteElementTxn *txn;
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result = TransactionFactory::GetNewTransaction(DeleteElementTxn::GetCID(), (EditTxn **)&txn);
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if (NS_FAILED(result)) return result;
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if (!txn) return NS_ERROR_NULL_POINTER;
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txn->Init(node);
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AppendChild(txn);
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iter->Next();
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}
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return result;
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}
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