gecko-dev/editor/libeditor/base/CreateElementTxn.cpp

197 lines
5.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include "CreateElementTxn.h"
#include "mozilla/dom/Element.h"
#include "nsAlgorithm.h"
#include "nsDebug.h"
#include "nsEditor.h"
#include "nsError.h"
#include "nsIContent.h"
#include "nsIDOMCharacterData.h"
#include "nsINode.h"
#include "nsISelection.h"
#include "nsISupportsUtils.h"
#include "nsMemory.h"
#include "nsReadableUtils.h"
#include "nsStringFwd.h"
#include "nsString.h"
#include "nsAString.h"
#include <algorithm>
#ifdef DEBUG
static bool gNoisy = false;
#endif
using namespace mozilla;
CreateElementTxn::CreateElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(CreateElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNewNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRefNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CreateElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNewNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRefNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(CreateElementTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(CreateElementTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CreateElementTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP CreateElementTxn::Init(nsEditor *aEditor,
const nsAString &aTag,
nsINode *aParent,
uint32_t aOffsetInParent)
{
NS_ASSERTION(aEditor&&aParent, "null args");
if (!aEditor || !aParent) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mTag = aTag;
mParent = do_QueryInterface(aParent);
mOffsetInParent = aOffsetInParent;
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::DoTransaction(void)
{
#ifdef DEBUG
if (gNoisy)
{
char* nodename = ToNewCString(mTag);
printf("Do Create Element parent = %p <%s>, offset = %d\n",
static_cast<void*>(mParent.get()), nodename, mOffsetInParent);
nsMemory::Free(nodename);
}
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
NS_ENSURE_TRUE(mEditor && mParent, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<dom::Element> newContent;
//new call to use instead to get proper HTML element, bug# 39919
nsresult result = mEditor->CreateHTMLContent(mTag, getter_AddRefs(newContent));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_STATE(newContent);
mNewNode = newContent;
// Try to insert formatting whitespace for the new node:
mEditor->MarkNodeDirty(mNewNode);
#ifdef DEBUG
if (gNoisy)
{
printf(" newNode = %p\n", static_cast<void*>(mNewNode.get()));
}
#endif
// insert the new node
if (CreateElementTxn::eAppend == int32_t(mOffsetInParent)) {
ErrorResult rv;
mParent->AppendChild(*mNewNode, rv);
return rv.ErrorCode();
}
mOffsetInParent = std::min(mOffsetInParent, mParent->GetChildCount());
// note, it's ok for mRefNode to be null. that means append
mRefNode = mParent->GetChildAt(mOffsetInParent);
ErrorResult rv;
mParent->InsertBefore(*mNewNode, mRefNode, rv);
NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
// only set selection to insertion point if editor gives permission
bool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (!bAdjustSelection) {
// do nothing - dom range gravity will adjust selection
return NS_OK;
}
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIContent> parentContent = do_QueryInterface(mParent);
NS_ENSURE_STATE(parentContent);
result = selection->CollapseNative(parentContent,
parentContent->IndexOf(newContent) + 1);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
return result;
}
NS_IMETHODIMP CreateElementTxn::UndoTransaction(void)
{
#ifdef DEBUG
if (gNoisy)
{
printf("Undo Create Element, mParent = %p, node = %p\n",
static_cast<void*>(mParent.get()),
static_cast<void*>(mNewNode.get()));
}
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
NS_ENSURE_TRUE(mEditor && mParent, NS_ERROR_NOT_INITIALIZED);
ErrorResult rv;
mParent->RemoveChild(*mNewNode, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP CreateElementTxn::RedoTransaction(void)
{
#ifdef DEBUG
if (gNoisy) { printf("Redo Create Element\n"); }
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
NS_ENSURE_TRUE(mEditor && mParent, NS_ERROR_NOT_INITIALIZED);
// first, reset mNewNode so it has no attributes or content
nsCOMPtr<nsIDOMCharacterData>nodeAsText = do_QueryInterface(mNewNode);
if (nodeAsText)
{
nodeAsText->SetData(EmptyString());
}
// now, reinsert mNewNode
ErrorResult rv;
mParent->InsertBefore(*mNewNode, mRefNode, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP CreateElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("CreateElementTxn: ");
aString += mTag;
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::GetNewNode(nsINode **aNewNode)
{
NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mNewNode, NS_ERROR_NOT_INITIALIZED);
*aNewNode = mNewNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}