ef5f3265cc
and merges in subsequent transactions indiscriminately until it's told to stop. It also gives the last transaction in its child list a chance to merge the next transaction. All this is in support of complex transactions that result in text insertion being able to collapse into a single undoable event. Also improved tracking of bogus content node used when document is empty. git-svn-id: svn://10.0.0.236/trunk@24151 18797224-902f-48f8-a5cc-f745e15eee43
392 lines
12 KiB
C++
392 lines
12 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 "nsTextEditRules.h"
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#include "nsTextEditor.h"
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#include "PlaceholderTxn.h"
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#include "InsertTextTxn.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMSelection.h"
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#include "nsIDOMRange.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIEnumerator.h"
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#include "nsIContent.h"
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const static char* kMOZEditorBogusNodeAttr="MOZ_EDITOR_BOGUS_NODE";
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const static char* kMOZEditorBogusNodeValue="TRUE";
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static NS_DEFINE_IID(kPlaceholderTxnIID, PLACEHOLDER_TXN_IID);
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static PRBool NodeIsType(nsIDOMNode *aNode, nsIAtom *aTag)
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{
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nsCOMPtr<nsIDOMElement>element;
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element = do_QueryInterface(aNode);
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if (element)
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{
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nsAutoString tag;
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element->GetTagName(tag);
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if (tag.Equals(aTag))
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{
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return PR_TRUE;
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}
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}
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return PR_FALSE;
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}
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PRBool IsEditable(nsIDOMNode *aNode)
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{
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if (!aNode) return PR_FALSE;
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nsCOMPtr<nsIDOMElement>element;
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element = do_QueryInterface(aNode);
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if (element)
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{
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nsAutoString att(kMOZEditorBogusNodeAttr);
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nsAutoString val;
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nsresult result = element->GetAttribute(att, val);
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if (val.Equals(kMOZEditorBogusNodeValue)) {
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return PR_FALSE;
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}
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else {
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return PR_TRUE;
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}
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}
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else
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{
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nsCOMPtr<nsIDOMCharacterData>text;
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text = do_QueryInterface(aNode);
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if (text)
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{
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nsAutoString data;
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text->GetData(data);
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if (0==data.Length()) {
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return PR_FALSE;
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}
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if ('\n'==data[0]) {
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return PR_FALSE;
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}
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else {
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return PR_TRUE;
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}
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}
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}
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return PR_TRUE;
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}
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nsTextEditRules::nsTextEditRules()
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{
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mEditor = nsnull;
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}
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nsTextEditRules::~nsTextEditRules()
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{
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// do NOT delete mEditor here. We do not hold a ref count to mEditor. mEditor owns our lifespan.
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}
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NS_IMETHODIMP
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nsTextEditRules::Init(nsTextEditor *aEditor)
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{
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// null aNextRule is ok
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if (!aEditor) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor; // we hold a non-refcounted reference back to our editor
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTextEditRules::WillInsert(nsIDOMSelection *aSelection, PRBool *aCancel)
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{
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if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
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// initialize out param
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*aCancel = PR_FALSE;
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// check for the magic content node and delete it if it exists
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if (mBogusNode)
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{
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mEditor->DeleteNode(mBogusNode);
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mBogusNode = do_QueryInterface(nsnull);
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// there is no longer any legit selection, so clear it.
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aSelection->ClearSelection();
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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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nsTextEditRules::DidInsert(nsIDOMSelection *aSelection, nsresult aResult)
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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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nsTextEditRules::WillInsertText(nsIDOMSelection *aSelection,
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const nsString& aInputString,
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PRBool *aCancel,
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nsString& aOutputString,
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PlaceholderTxn **aTxn)
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{
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if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
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// initialize out param
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*aCancel = PR_FALSE;
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// by default, we insert what we're told to insert
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aOutputString = aInputString;
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if (mBogusNode)
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{
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nsresult result = TransactionFactory::GetNewTransaction(kPlaceholderTxnIID, (EditTxn **)aTxn);
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if (NS_FAILED(result)) { return result; }
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if (!*aTxn) { return NS_ERROR_NULL_POINTER; }
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(*aTxn)->SetName(InsertTextTxn::gInsertTextTxnName);
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mEditor->Do(*aTxn);
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}
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return WillInsert(aSelection, aCancel);
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}
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NS_IMETHODIMP
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nsTextEditRules::DidInsertText(nsIDOMSelection *aSelection,
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const nsString& aStringToInsert,
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nsresult aResult)
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{
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return DidInsert(aSelection, aResult);
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}
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NS_IMETHODIMP
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nsTextEditRules::WillInsertBreak(nsIDOMSelection *aSelection, PRBool *aCancel)
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{
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if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
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// initialize out param
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*aCancel = PR_FALSE;
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return WillInsert(aSelection, aCancel);
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}
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// XXX: this code is all experimental, and has no effect on the content model yet
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// the point here is to collapse adjacent BR's into P's
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NS_IMETHODIMP
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nsTextEditRules::DidInsertBreak(nsIDOMSelection *aSelection, nsresult aResult)
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{
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nsresult result = aResult; // if aResult is an error, we return it.
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if (!aSelection) { return NS_ERROR_NULL_POINTER; }
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PRBool isCollapsed;
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aSelection->IsCollapsed(&isCollapsed);
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NS_ASSERTION(PR_TRUE==isCollapsed, "selection not collapsed after insert break.");
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// if the insert break resulted in consecutive BR tags,
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// collapse the two BR tags into a single P
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if (NS_SUCCEEDED(aResult)) // note we're checking aResult, the param that tells us if the insert break happened or not
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{
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nsCOMPtr<nsIEnumerator> enumerator;
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enumerator = do_QueryInterface(aSelection,&result);
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if (enumerator)
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{
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enumerator->First();
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nsISupports *currentItem;
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result = enumerator->CurrentItem(¤tItem);
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if ((NS_SUCCEEDED(result)) && currentItem)
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{
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result = NS_ERROR_UNEXPECTED;
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nsCOMPtr<nsIDOMRange> range( do_QueryInterface(currentItem) );
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if (range)
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{
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nsIAtom *brTag = NS_NewAtom("BR");
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nsCOMPtr<nsIDOMNode> startNode;
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result = range->GetStartParent(getter_AddRefs(startNode));
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if ((NS_SUCCEEDED(result)) && startNode)
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{
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PRInt32 offset;
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range->GetStartOffset(&offset);
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nsCOMPtr<nsIDOMNodeList>startNodeChildren;
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result = startNode->GetChildNodes(getter_AddRefs(startNodeChildren));
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if ((NS_SUCCEEDED(result)) && startNodeChildren)
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{
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nsCOMPtr<nsIDOMNode> selectedNode;
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result = startNodeChildren->Item(offset, getter_AddRefs(selectedNode));
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if ((NS_SUCCEEDED(result)) && selectedNode)
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{
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nsCOMPtr<nsIDOMNode> prevNode;
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result = selectedNode->GetPreviousSibling(getter_AddRefs(prevNode));
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if ((NS_SUCCEEDED(result)) && prevNode)
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{
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if (PR_TRUE==NodeIsType(prevNode, brTag))
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{ // the previous node is a BR, check it's siblings
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nsCOMPtr<nsIDOMNode> leftNode;
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result = prevNode->GetPreviousSibling(getter_AddRefs(leftNode));
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if ((NS_SUCCEEDED(result)) && leftNode)
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{
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if (PR_TRUE==NodeIsType(leftNode, brTag))
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{ // left sibling is also a BR, collapse
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printf("1\n");
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}
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else
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{
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if (PR_TRUE==NodeIsType(selectedNode, brTag))
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{ // right sibling is also a BR, collapse
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printf("2\n");
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}
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}
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}
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}
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}
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// now check the next node from selectedNode
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nsCOMPtr<nsIDOMNode> nextNode;
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result = selectedNode->GetNextSibling(getter_AddRefs(nextNode));
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if ((NS_SUCCEEDED(result)) && nextNode)
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{
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if (PR_TRUE==NodeIsType(nextNode, brTag))
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{ // the previous node is a BR, check it's siblings
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nsCOMPtr<nsIDOMNode> rightNode;
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result = nextNode->GetNextSibling(getter_AddRefs(rightNode));
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if ((NS_SUCCEEDED(result)) && rightNode)
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{
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if (PR_TRUE==NodeIsType(rightNode, brTag))
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{ // right sibling is also a BR, collapse
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printf("3\n");
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}
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else
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{
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if (PR_TRUE==NodeIsType(selectedNode, brTag))
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{ // left sibling is also a BR, collapse
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printf("4\n");
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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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}
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}
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NS_RELEASE(brTag);
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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
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nsTextEditRules::GetInsertBreakTag(nsIAtom **aTag)
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{
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if (!aTag) { return NS_ERROR_NULL_POINTER; }
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*aTag = NS_NewAtom("BR");
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTextEditRules::WillDeleteSelection(nsIDOMSelection *aSelection, PRBool *aCancel)
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{
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if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
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// initialize out param
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*aCancel = PR_FALSE;
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// if there is only bogus content, cancel the operation
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if (mBogusNode) {
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*aCancel = PR_TRUE;
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return NS_OK;
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}
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return NS_OK;
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}
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// if the document is empty, insert a bogus text node with a
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NS_IMETHODIMP
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nsTextEditRules::DidDeleteSelection(nsIDOMSelection *aSelection, nsresult aResult)
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{
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nsresult result = aResult; // if aResult is an error, we just return it
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if (!aSelection) { return NS_ERROR_NULL_POINTER; }
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PRBool isCollapsed;
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aSelection->IsCollapsed(&isCollapsed);
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NS_ASSERTION(PR_TRUE==isCollapsed, "selection not collapsed after delete selection.");
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// if the delete selection resulted in no content
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// insert a special bogus text node with a character in it.
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if (NS_SUCCEEDED(aResult)) // note we're checking aResult, the param that tells us if the insert break happened or not
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{
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nsCOMPtr<nsIDOMDocument>doc;
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mEditor->GetDocument(getter_AddRefs(doc));
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nsCOMPtr<nsIDOMNodeList>nodeList;
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nsAutoString bodyTag = "body";
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nsresult result = doc->GetElementsByTagName(bodyTag, getter_AddRefs(nodeList));
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if ((NS_SUCCEEDED(result)) && nodeList)
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{
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PRUint32 count;
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nodeList->GetLength(&count);
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NS_ASSERTION(1==count, "there is not exactly 1 body in the document!");
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nsCOMPtr<nsIDOMNode>bodyNode;
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result = nodeList->Item(0, getter_AddRefs(bodyNode));
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if ((NS_SUCCEEDED(result)) && bodyNode)
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{ // now we've got the body tag.
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// iterate the body tag, looking for editable content
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// if no editable content is found, insert the bogus node
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PRBool needsBogusContent=PR_TRUE;
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nsCOMPtr<nsIDOMNode>bodyChild;
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result = bodyNode->GetFirstChild(getter_AddRefs(bodyChild));
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while ((NS_SUCCEEDED(result)) && bodyChild)
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{
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if (PR_TRUE==IsEditable(bodyChild))
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{
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needsBogusContent = PR_FALSE;
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break;
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}
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nsCOMPtr<nsIDOMNode>temp;
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bodyChild->GetNextSibling(getter_AddRefs(temp));
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bodyChild = do_QueryInterface(temp);
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}
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if (PR_TRUE==needsBogusContent)
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{
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// set mBogusNode to be the newly created <P>
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result = mEditor->CreateNode(nsAutoString("P"), bodyNode, 0,
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getter_AddRefs(mBogusNode));
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if ((NS_SUCCEEDED(result)) && mBogusNode)
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{
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nsCOMPtr<nsIDOMNode>newTNode;
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result = mEditor->CreateNode(nsIEditor::GetTextNodeTag(), mBogusNode, 0,
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getter_AddRefs(newTNode));
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if ((NS_SUCCEEDED(result)) && newTNode)
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{
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nsCOMPtr<nsIDOMCharacterData>newNodeAsText;
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newNodeAsText = do_QueryInterface(newTNode);
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if (newNodeAsText)
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{
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nsAutoString data;
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data += 160;
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newNodeAsText->SetData(data);
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aSelection->Collapse(newTNode, 0);
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}
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}
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// make sure we know the PNode is bogus
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nsCOMPtr<nsIDOMElement>newPElement;
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newPElement = do_QueryInterface(mBogusNode);
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if (newPElement)
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{
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nsAutoString att(kMOZEditorBogusNodeAttr);
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nsAutoString val(kMOZEditorBogusNodeValue);
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newPElement->SetAttribute(att, val);
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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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