gecko-dev/editor/base/CreateElementTxn.cpp

237 строки
7.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "CreateElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMSelection.h"
#include "nsIDOMText.h"
#include "nsIDOMElement.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
CreateElementTxn::CreateElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP CreateElementTxn::Init(nsIEditor *aEditor,
const nsString &aTag,
nsIDOMNode *aParent,
PRUint32 aOffsetInParent)
{
NS_ASSERTION(aEditor&&aParent, "null args");
if (aEditor && aParent)
{
mEditor = aEditor;
mTag = aTag;
mParent = do_QueryInterface(aParent);
mOffsetInParent = aOffsetInParent;
#ifdef NS_DEBUG
{
nsCOMPtr<nsIDOMNodeList> testChildNodes;
nsresult testResult = mParent->GetChildNodes(getter_AddRefs(testChildNodes));
NS_ASSERTION(testChildNodes, "bad parent type, can't have children.");
NS_ASSERTION(NS_SUCCEEDED(testResult), "bad result.");
}
#endif
return NS_OK;
}
else
return NS_ERROR_NULL_POINTER;
}
CreateElementTxn::~CreateElementTxn()
{
}
NS_IMETHODIMP CreateElementTxn::Do(void)
{
if (gNoisy) { printf("Do Create Element parent = %p, offset = %d\n",
mParent.get(), mOffsetInParent); }
NS_ASSERTION(mEditor, "bad state -- null editor");
nsresult result = NS_ERROR_NULL_POINTER;
if (mEditor)
{
// create a new node
nsCOMPtr<nsIDOMDocument>doc;
result = mEditor->GetDocument(getter_AddRefs(doc));
if ((NS_SUCCEEDED(result)) && (doc))
{
if (nsIEditor::GetTextNodeTag() == mTag)
{
const nsString stringData;
nsCOMPtr<nsIDOMText>newTextNode;
result = doc->CreateTextNode(stringData, getter_AddRefs(newTextNode));
if (NS_SUCCEEDED(result) && newTextNode) {
mNewNode = do_QueryInterface(newTextNode);
}
}
else
{
nsCOMPtr<nsIDOMElement>newElement;
result = doc->CreateElement(mTag, getter_AddRefs(newElement));
if (NS_SUCCEEDED(result) && newElement) {
mNewNode = do_QueryInterface(newElement);
}
}
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewNode)), "could not create element.");
if ((NS_SUCCEEDED(result)) && (mNewNode))
{
if (gNoisy) { printf(" newNode = %p\n", mNewNode.get()); }
// insert the new node
nsCOMPtr<nsIDOMNode> resultNode;
if (CreateElementTxn::eAppend==(PRInt32)mOffsetInParent)
{
result = mParent->AppendChild(mNewNode, getter_AddRefs(resultNode));
}
else
{
nsCOMPtr<nsIDOMNodeList> childNodes;
result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
PRUint32 count;
childNodes->GetLength(&count);
if (mOffsetInParent>count)
mOffsetInParent = count;
result = childNodes->Item(mOffsetInParent, getter_AddRefs(mRefNode));
if (NS_SUCCEEDED(result)) // note, it's ok for mRefNode to be null. that means append
{
result = mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(selectionResult) && selection) {
PRInt32 offset=0;
nsEditor::GetChildOffset(mNewNode, mParent, offset);
selectionResult = selection->Collapse(mParent, offset);
NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
}
}
}
}
}
}
}
}
return result;
}
NS_IMETHODIMP CreateElementTxn::Undo(void)
{
if (gNoisy) { printf("Undo Create Element, mParent = %p, node = %p\n",
mParent.get(), mNewNode.get()); }
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->RemoveChild(mNewNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(selectionResult) && selection) {
PRInt32 offset=0;
if (mRefNode) {
nsEditor::GetChildOffset(mRefNode, mParent, offset);
}
selectionResult = selection->Collapse(mParent, offset);
NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
}
}
return result;
}
NS_IMETHODIMP CreateElementTxn::Redo(void)
{
if (gNoisy) { printf("Redo Create Element\n"); }
// first, reset mNewNode so it has no attributes or content
nsCOMPtr<nsIDOMCharacterData>nodeAsText;
nodeAsText = do_QueryInterface(mNewNode);
if (nodeAsText)
{
nsAutoString nullString;
nodeAsText->SetData(nullString);
}
// now, reinsert mNewNode
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection) {
PRInt32 offset=0;
nsEditor::GetChildOffset(mNewNode, mParent, offset);
nsresult selectionResult = selection->Collapse(mParent, offset);
NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
}
}
return result;
}
NS_IMETHODIMP CreateElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Element: ";
*aString += mTag;
}
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Create Element: ";
*aString += mTag;
}
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::GetNewNode(nsIDOMNode **aNewNode)
{
if (!aNewNode)
return NS_ERROR_NULL_POINTER;
if (!mNewNode)
return NS_ERROR_NOT_INITIALIZED;
*aNewNode = mNewNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}