зеркало из https://github.com/mozilla/pjs.git
184 строки
5.5 KiB
C++
184 строки
5.5 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 "JoinElementTxn.h"
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#include "nsEditor.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIDOMSelection.h"
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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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JoinElementTxn::JoinElementTxn()
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: EditTxn()
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{
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}
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NS_IMETHODIMP JoinElementTxn::Init(nsIEditor *aEditor,
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nsIDOMNode *aLeftNode,
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nsIDOMNode *aRightNode)
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{
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NS_PRECONDITION((aEditor && aLeftNode && aRightNode), "null arg");
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if (!aEditor || !aLeftNode || !aRightNode) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor;
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mLeftNode = do_QueryInterface(aLeftNode);
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mRightNode = do_QueryInterface(aRightNode);
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mOffset=0;
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return NS_OK;
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}
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JoinElementTxn::~JoinElementTxn()
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{
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}
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// After Do() and Redo(), the left node is removed from the content tree and right node remains.
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NS_IMETHODIMP JoinElementTxn::Do(void)
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{
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if (gNoisy) { printf("%p Do Join of %p and %p\n", this, mLeftNode.get(), mRightNode.get()); }
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NS_PRECONDITION((mEditor && mLeftNode && mRightNode), "null arg");
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if (!mEditor || !mLeftNode || !mRightNode) { return NS_ERROR_NOT_INITIALIZED; }
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// get the parent node
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nsCOMPtr<nsIDOMNode>leftParent;
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nsresult result = mLeftNode->GetParentNode(getter_AddRefs(leftParent));
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if (NS_FAILED(result)) return result;
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if (!leftParent) return NS_ERROR_NULL_POINTER;
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// verify that mLeftNode and mRightNode have the same parent
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nsCOMPtr<nsIDOMNode>rightParent;
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result = mRightNode->GetParentNode(getter_AddRefs(rightParent));
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if (NS_FAILED(result)) return result;
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if (!rightParent) return NS_ERROR_NULL_POINTER;
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if (leftParent==rightParent)
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{
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mParent= do_QueryInterface(leftParent); // set this instance mParent.
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// Other methods will see a non-null mParent and know all is well
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nsCOMPtr<nsIDOMCharacterData> leftNodeAsText;
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leftNodeAsText = do_QueryInterface(mLeftNode);
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if (leftNodeAsText)
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{
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leftNodeAsText->GetLength(&mOffset);
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}
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else
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{
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nsCOMPtr<nsIDOMNodeList> childNodes;
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result = mLeftNode->GetChildNodes(getter_AddRefs(childNodes));
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if (NS_FAILED(result)) return result;
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if (childNodes)
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{
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childNodes->GetLength(&mOffset);
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}
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}
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result = nsEditor::JoinNodesImpl(mRightNode, mLeftNode, mParent, PR_FALSE);
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if (NS_SUCCEEDED(result))
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{
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if (gNoisy) { printf(" left node = %p removed\n", mLeftNode.get()); }
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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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selection->Collapse(mRightNode, mOffset);
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}
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}
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else
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{
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NS_ASSERTION(PR_FALSE, "2 nodes do not have same parent");
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return NS_ERROR_INVALID_ARG;
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}
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return result;
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}
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//XXX: what if instead of split, we just deleted the unneeded children of mRight
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// and re-inserted mLeft?
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NS_IMETHODIMP JoinElementTxn::Undo(void)
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{
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if (gNoisy) { printf("%p Undo Join, right node = %p\n", this, mRightNode.get()); }
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NS_ASSERTION(mRightNode && mLeftNode && mParent, "bad state");
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if (!mRightNode || !mLeftNode || !mParent) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result;
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nsCOMPtr<nsIDOMNode>resultNode;
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// first, massage the existing node so it is in its post-split state
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nsCOMPtr<nsIDOMCharacterData>rightNodeAsText;
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rightNodeAsText = do_QueryInterface(mRightNode);
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if (rightNodeAsText)
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{
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result = rightNodeAsText->DeleteData(0, mOffset);
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}
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else
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{
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nsCOMPtr<nsIDOMNode>child;
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nsCOMPtr<nsIDOMNode>nextSibling;
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result = mRightNode->GetFirstChild(getter_AddRefs(child));
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PRUint32 i;
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for (i=0; i<mOffset; i++)
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{
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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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child->GetNextSibling(getter_AddRefs(nextSibling));
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result = mLeftNode->AppendChild(child, getter_AddRefs(resultNode));
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child = do_QueryInterface(nextSibling);
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}
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}
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// second, re-insert the left node into the tree
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result = mParent->InsertBefore(mLeftNode, mRightNode, getter_AddRefs(resultNode));
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return result;
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}
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NS_IMETHODIMP JoinElementTxn::GetIsTransient(PRBool *aIsTransient)
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{
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if (nsnull!=aIsTransient)
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*aIsTransient = PR_FALSE;
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return NS_OK;
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}
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nsresult JoinElementTxn::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 JoinElementTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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NS_IMETHODIMP JoinElementTxn::GetUndoString(nsString *aString)
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{
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if (nsnull!=aString)
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{
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*aString="Join Element";
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}
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return NS_OK;
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}
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NS_IMETHODIMP JoinElementTxn::GetRedoString(nsString *aString)
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{
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if (nsnull!=aString)
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{
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*aString="Split Element";
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}
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return NS_OK;
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}
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