зеркало из https://github.com/mozilla/pjs.git
211 строки
6.0 KiB
C++
211 строки
6.0 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 "InsertTextTxn.h"
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#include "nsEditor.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIDOMSelection.h"
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#include "nsIPresShell.h"
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#include "EditAggregateTxn.h"
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static NS_DEFINE_IID(kInsertTextTxnIID, INSERT_TEXT_TXN_IID);
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static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);
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nsIAtom *InsertTextTxn::gInsertTextTxnName;
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nsresult InsertTextTxn::ClassInit()
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{
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if (nsnull==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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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 nsString& aStringToInsert,
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nsIPresShell* aPresShell)
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{
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mElement = do_QueryInterface(aElement);
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mOffset = aOffset;
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mStringToInsert = aStringToInsert;
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mPresShell = aPresShell;
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return NS_OK;
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}
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NS_IMETHODIMP InsertTextTxn::Do(void)
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{
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// advance caret: This requires the presentation shell to get the selection.
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nsCOMPtr<nsIDOMSelection> selection;
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nsresult result = mPresShell->GetSelection(getter_AddRefs(selection));
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NS_ASSERTION(selection,"Could not get selection in InsertTextTxn::Do\n");
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if (NS_SUCCEEDED(result) && selection) {
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result = mElement->InsertData(mOffset, mStringToInsert);
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if (NS_SUCCEEDED(result)) {
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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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}
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return result;
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}
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NS_IMETHODIMP InsertTextTxn::Undo(void)
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{
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nsresult result;
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PRUint32 length = mStringToInsert.Length();
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result = mElement->DeleteData(mOffset, length);
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if (NS_SUCCEEDED(result))
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{ // set the selection to the insertion point where the string was removed
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nsCOMPtr<nsIDOMSelection> selection;
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result = mPresShell->GetSelection(getter_AddRefs(selection));
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if (NS_SUCCEEDED(result) && selection) {
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result = selection->Collapse(mElement, mOffset);
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NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of insert.");
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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::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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// set out param default value
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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nsresult result = NS_OK;
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if ((nsnull!=aDidMerge) && (nsnull!=aTransaction))
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{
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// if aTransaction isa InsertTextTxn, and if the selection hasn't changed,
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// then absorb it
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nsCOMPtr<InsertTextTxn> otherTxn( do_QueryInterface(aTransaction) );
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if (otherTxn)
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{
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if (PR_TRUE==IsSequentialInsert(otherTxn))
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{
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nsAutoString otherData;
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otherTxn->GetData(otherData);
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mStringToInsert += otherData;
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*aDidMerge = PR_TRUE;
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}
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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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nsCOMPtr<EditAggregateTxn> otherTxn( do_QueryInterface(aTransaction) );
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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.get()==gInsertTextTxnName)
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{ // yep, it's one of ours. By definition, it must contain only
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// a single InsertTextTxn
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nsCOMPtr<EditTxn> childTxn;
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otherTxn->GetTxnAt(0, getter_AddRefs(childTxn));
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nsCOMPtr<InsertTextTxn> otherInsertTxn;
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otherInsertTxn = do_QueryInterface(childTxn, &result);
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if (otherInsertTxn)
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{
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if (PR_TRUE==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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}
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}
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}
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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::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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NS_IMETHODIMP InsertTextTxn::GetUndoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Remove Text: ";
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**aString += mStringToInsert;
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}
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return NS_OK;
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}
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NS_IMETHODIMP InsertTextTxn::GetRedoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Insert Text: ";
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**aString += mStringToInsert;
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}
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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 (nsnull == aInstancePtr) {
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return NS_ERROR_NULL_POINTER;
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}
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if (aIID.Equals(kInsertTextTxnIID)) {
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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(nsnull!=aOtherTxn, "null param");
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PRBool result=PR_FALSE;
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if (nsnull!=aOtherTxn)
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{
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if (aOtherTxn->mElement == mElement)
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{
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// here, we need to compare offsets.
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PRInt32 strlen = mStringToInsert.Length();
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if (aOtherTxn->mOffset==(mOffset+strlen))
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{
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result = PR_TRUE;
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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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