mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-09-19 11:40:21 +02:00
254 lines
7.7 KiB
C++
254 lines
7.7 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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#include "InsertTextTxn.h"
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#include "nsIDOMCharacterData.h"
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#include "nsISelection.h"
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#include "EditAggregateTxn.h"
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#ifdef NS_DEBUG
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static PRBool gNoisy = PR_FALSE;
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#endif
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nsIAtom *InsertTextTxn::gInsertTextTxnName;
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nsresult InsertTextTxn::ClassInit()
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{
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if (!gInsertTextTxnName)
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gInsertTextTxnName = NS_NewAtom("NS_InsertTextTxn");
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return NS_OK;
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}
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nsresult InsertTextTxn::ClassShutdown()
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{
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NS_IF_RELEASE(gInsertTextTxnName);
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return NS_OK;
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}
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InsertTextTxn::InsertTextTxn()
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: EditTxn()
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{
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}
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InsertTextTxn::~InsertTextTxn()
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{
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}
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NS_IMETHODIMP InsertTextTxn::Init(nsIDOMCharacterData *aElement,
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PRUint32 aOffset,
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const nsAString &aStringToInsert,
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nsIEditor *aEditor)
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{
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#if 0
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nsAutoString text;
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aElement->GetData(text);
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printf("InsertTextTxn: Offset to insert at = %d. Text of the node to insert into:\n", aOffset);
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wprintf(text.get());
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printf("\n");
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#endif
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NS_ASSERTION(aElement && aEditor, "bad args");
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if (!aElement || !aEditor) return NS_ERROR_NULL_POINTER;
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mElement = do_QueryInterface(aElement);
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mOffset = aOffset;
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mStringToInsert = aStringToInsert;
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mEditor = aEditor;
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return NS_OK;
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}
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NS_IMETHODIMP InsertTextTxn::DoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("Do Insert Text element = %p\n", mElement.get()); }
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#endif
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NS_ASSERTION(mElement && mEditor, "bad state");
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if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result = mElement->InsertData(mOffset, mStringToInsert);
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if (NS_FAILED(result)) return result;
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// only set selection to insertion point if editor gives permission
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PRBool bAdjustSelection;
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mEditor->ShouldTxnSetSelection(&bAdjustSelection);
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if (bAdjustSelection)
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{
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nsCOMPtr<nsISelection> 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(mElement, mOffset+mStringToInsert.Length());
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NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
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}
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else
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{
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// do nothing - dom range gravity will adjust selection
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}
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return result;
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}
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NS_IMETHODIMP InsertTextTxn::UndoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("Undo Insert Text element = %p\n", mElement.get()); }
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#endif
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NS_ASSERTION(mElement && mEditor, "bad state");
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if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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PRUint32 length = mStringToInsert.Length();
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return mElement->DeleteData(mOffset, length);
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}
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NS_IMETHODIMP InsertTextTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
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{
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// set out param default value
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if (aDidMerge)
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*aDidMerge = PR_FALSE;
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nsresult result = NS_OK;
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if (aDidMerge && aTransaction)
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{
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// if aTransaction is a InsertTextTxn, and if the selection hasn't changed,
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// then absorb it
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InsertTextTxn *otherInsTxn = nsnull;
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aTransaction->QueryInterface(InsertTextTxn::GetCID(), (void **)&otherInsTxn);
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if (otherInsTxn)
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{
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if (IsSequentialInsert(otherInsTxn))
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{
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nsAutoString otherData;
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otherInsTxn->GetData(otherData);
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mStringToInsert += otherData;
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*aDidMerge = PR_TRUE;
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#ifdef NS_DEBUG
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if (gNoisy) { printf("InsertTextTxn assimilated %p\n", aTransaction); }
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#endif
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}
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NS_RELEASE(otherInsTxn);
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}
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else
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{ // the next InsertTextTxn might be inside an aggregate that we have special knowledge of
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EditAggregateTxn *otherTxn = nsnull;
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aTransaction->QueryInterface(EditAggregateTxn::GetCID(), (void **)&otherTxn);
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if (otherTxn)
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{
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nsCOMPtr<nsIAtom> txnName;
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otherTxn->GetName(getter_AddRefs(txnName));
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if (txnName && txnName.get()==gInsertTextTxnName)
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{ // yep, it's one of ours. By definition, it must contain only
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// another aggregate with a single child,
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// or a single InsertTextTxn
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EditTxn * childTxn;
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otherTxn->GetTxnAt(0, (&childTxn));
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if (childTxn)
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{
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InsertTextTxn * otherInsertTxn = nsnull;
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result = childTxn->QueryInterface(InsertTextTxn::GetCID(), (void**)&otherInsertTxn);
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if (NS_SUCCEEDED(result))
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{
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if (otherInsertTxn)
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{
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if (IsSequentialInsert(otherInsertTxn))
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{
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nsAutoString otherData;
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otherInsertTxn->GetData(otherData);
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mStringToInsert += otherData;
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*aDidMerge = PR_TRUE;
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#ifdef NS_DEBUG
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if (gNoisy) { printf("InsertTextTxn assimilated %p\n", aTransaction); }
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#endif
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}
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NS_RELEASE(otherInsertTxn);
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}
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}
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NS_RELEASE(childTxn);
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}
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}
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NS_RELEASE(otherTxn);
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}
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}
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}
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return result;
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}
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NS_IMETHODIMP InsertTextTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("InsertTextTxn: ");
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aString += mStringToInsert;
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return NS_OK;
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}
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/* ============= nsISupports implementation ====================== */
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NS_IMETHODIMP
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InsertTextTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
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{
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if (!aInstancePtr) {
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return NS_ERROR_NULL_POINTER;
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}
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if (aIID.Equals(InsertTextTxn::GetCID())) {
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*aInstancePtr = (void*)(InsertTextTxn*)this;
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NS_ADDREF_THIS();
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return NS_OK;
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}
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return (EditTxn::QueryInterface(aIID, aInstancePtr));
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}
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/* ============ protected methods ================== */
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NS_IMETHODIMP InsertTextTxn::GetData(nsString& aResult)
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{
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aResult = mStringToInsert;
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return NS_OK;
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}
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PRBool InsertTextTxn::IsSequentialInsert(InsertTextTxn *aOtherTxn)
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{
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NS_ASSERTION(aOtherTxn, "null param");
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if (aOtherTxn && aOtherTxn->mElement == mElement)
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{
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// here, we need to compare offsets.
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PRInt32 length = mStringToInsert.Length();
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if (aOtherTxn->mOffset == (mOffset + length))
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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