зеркало из https://github.com/mozilla/pjs.git
229 строки
7.2 KiB
C++
229 строки
7.2 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 "SplitElementTxn.h"
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#include "nsEditor.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMSelection.h"
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#include "nsIDOMCharacterData.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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// note that aEditor is not refcounted
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SplitElementTxn::SplitElementTxn()
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: EditTxn()
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{
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}
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NS_IMETHODIMP SplitElementTxn::Init(nsIEditor *aEditor,
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nsIDOMNode *aNode,
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PRInt32 aOffset)
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{
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NS_ASSERTION(aEditor && aNode, "bad args");
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if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
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mEditor = aEditor;
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mExistingRightNode = do_QueryInterface(aNode);
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mOffset = aOffset;
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return NS_OK;
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}
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SplitElementTxn::~SplitElementTxn()
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{
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}
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NS_IMETHODIMP SplitElementTxn::Do(void)
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{
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if (gNoisy) { printf("%p Do Split of node %p offset %d\n", this, mExistingRightNode.get(), mOffset); }
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NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
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if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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// create a new node
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nsresult result = mExistingRightNode->CloneNode(PR_FALSE, getter_AddRefs(mNewLeftNode));
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NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
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if (NS_FAILED(result)) return result;
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if (!mNewLeftNode) return NS_ERROR_NULL_POINTER;
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if (gNoisy) { printf(" created left node = %p\n", mNewLeftNode.get()); }
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// get the parent node
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result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
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if (NS_FAILED(result)) return result;
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if (!mParent) return NS_ERROR_NULL_POINTER;
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// insert the new node
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result = nsEditor::SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
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if (NS_SUCCEEDED(result) && mNewLeftNode)
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{
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// Insert formatting whitespace for the new node:
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mEditor->InsertFormattingForNode(mExistingRightNode);
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nsCOMPtr<nsIDOMSelection>selection;
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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(mNewLeftNode, mOffset);
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}
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else {
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result = NS_ERROR_NOT_IMPLEMENTED;
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}
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return result;
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}
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NS_IMETHODIMP SplitElementTxn::Undo(void)
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{
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if (gNoisy) {
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printf("%p Undo Split of existing node %p and new node %p offset %d\n",
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this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
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}
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NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
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if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// this assumes Do inserted the new node in front of the prior existing node
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nsresult result;
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result = nsEditor::JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent, PR_FALSE);
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if (gNoisy)
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{
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printf("** after join left child node %p into right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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if (NS_SUCCEEDED(result))
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{
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if (gNoisy) { printf(" left node = %p removed\n", mNewLeftNode.get()); }
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nsCOMPtr<nsIDOMSelection>selection;
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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(mExistingRightNode, mOffset);
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}
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else {
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result = NS_ERROR_NOT_IMPLEMENTED;
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}
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return result;
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}
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/* redo cannot simply resplit the right node, because subsequent transactions
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* on the redo stack may depend on the left node existing in its previous state.
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*/
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NS_IMETHODIMP SplitElementTxn::Redo(void)
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{
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NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
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if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (gNoisy) {
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printf("%p Redo Split of existing node %p and new node %p offset %d\n",
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this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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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(mExistingRightNode);
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if (rightNodeAsText)
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{
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result = rightNodeAsText->DeleteData(0, mOffset);
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if (gNoisy)
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{
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printf("** after delete of text in right text node %p offset %d\n", rightNodeAsText.get(), mOffset);
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mEditor->DebugDumpContent(); // DEBUG
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}
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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 = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
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PRInt32 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 = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
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if (NS_SUCCEEDED(result))
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{
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result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
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if (gNoisy)
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{
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printf("** move child node %p from right node %p to left node %p\n", child.get(), mExistingRightNode.get(), mNewLeftNode.get());
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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}
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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(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
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if (gNoisy)
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{
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printf("** reinsert left child node %p before right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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return result;
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}
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NS_IMETHODIMP SplitElementTxn::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 SplitElementTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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NS_IMETHODIMP SplitElementTxn::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 SplitElementTxn::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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NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
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{
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if (!aNewNode)
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return NS_ERROR_NULL_POINTER;
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if (!mNewLeftNode)
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return NS_ERROR_NOT_INITIALIZED;
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*aNewNode = mNewLeftNode;
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NS_ADDREF(*aNewNode);
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return NS_OK;
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}
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