gecko/editor/libeditor/base/InsertElementTxn.cpp

141 lines
4.3 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 "InsertElementTxn.h"
#include "nsISelection.h"
#include "nsIContent.h"
#include "nsIDOMNodeList.h"
#include "nsReadableUtils.h"
#ifdef NS_DEBUG
static bool gNoisy = false;
#endif
InsertElementTxn::InsertElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(InsertElementTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(InsertElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(InsertElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(InsertElementTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(InsertElementTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertElementTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP InsertElementTxn::Init(nsIDOMNode *aNode,
nsIDOMNode *aParent,
PRInt32 aOffset,
nsIEditor *aEditor)
{
NS_ASSERTION(aNode && aParent && aEditor, "bad arg");
NS_ENSURE_TRUE(aNode && aParent && aEditor, NS_ERROR_NULL_POINTER);
mNode = do_QueryInterface(aNode);
mParent = do_QueryInterface(aParent);
mOffset = aOffset;
mEditor = aEditor;
NS_ENSURE_TRUE(mNode && mParent && mEditor, NS_ERROR_INVALID_ARG);
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
nsCOMPtr<nsIContent>nodeAsContent = do_QueryInterface(mNode);
nsCOMPtr<nsIContent>parentAsContent = do_QueryInterface(mParent);
nsString namestr;
mNode->GetNodeName(namestr);
char* nodename = ToNewCString(namestr);
printf("%p Do Insert Element of %p <%s> into parent %p at offset %d\n",
static_cast<void*>(this),
static_cast<void*>(nodeAsContent.get()),
nodename,
static_cast<void*>(parentAsContent.get()),
mOffset);
nsMemory::Free(nodename);
}
#endif
NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
NS_ENSURE_STATE(parent);
PRUint32 count = parent->GetChildCount();
if (mOffset > PRInt32(count) || mOffset == -1) {
// -1 is sentinel value meaning "append at end"
mOffset = count;
}
nsIContent* refContent = parent->GetChildAt(mOffset);
// note, it's ok for refNode to be null. that means append
nsCOMPtr<nsIDOMNode> refNode = refContent ? refContent->AsDOMNode() : nsnull;
mEditor->MarkNodeDirty(mNode);
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->InsertBefore(mNode, refNode, getter_AddRefs(resultNode));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(resultNode, NS_ERROR_NULL_POINTER);
// only set selection to insertion point if editor gives permission
bool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
// place the selection just after the inserted element
selection->Collapse(mParent, mOffset+1);
}
else
{
// do nothing - dom range gravity will adjust selection
}
return result;
}
NS_IMETHODIMP InsertElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
printf("%p Undo Insert Element of %p into parent %p at offset %d\n",
static_cast<void*>(this),
static_cast<void*>(mNode.get()),
static_cast<void*>(mParent.get()),
mOffset);
}
#endif
NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP InsertElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertElementTxn");
return NS_OK;
}