gecko/editor/libeditor/base/InsertElementTxn.cpp

108 lines
3.4 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> // for printf
#include "InsertElementTxn.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ENSURE_TRUE, etc
#include "nsEditor.h" // for nsEditor
#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc
#include "nsIContent.h" // for nsIContent
#include "nsINode.h" // for nsINode
#include "nsISelection.h" // for nsISelection
#include "nsMemory.h" // for nsMemory
#include "nsReadableUtils.h" // for ToNewCString
#include "nsString.h" // for nsString
using namespace mozilla;
InsertElementTxn::InsertElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED_2(InsertElementTxn, EditTxn,
mNode,
mParent)
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(nsINode *aNode,
nsINode *aParent,
int32_t aOffset,
nsEditor *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)
{
NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
NS_ENSURE_STATE(parent);
uint32_t count = parent->GetChildCount();
if (mOffset > int32_t(count) || mOffset == -1) {
// -1 is sentinel value meaning "append at end"
mOffset = count;
}
// note, it's ok for refContent to be null. that means append
nsCOMPtr<nsIContent> refContent = parent->GetChildAt(mOffset);
mEditor->MarkNodeDirty(mNode);
ErrorResult rv;
mParent->InsertBefore(*mNode, refContent, 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)
{
nsCOMPtr<nsISelection> selection;
rv = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
// place the selection just after the inserted element
selection->Collapse(mParent->AsDOMNode(), mOffset+1);
}
else
{
// do nothing - dom range gravity will adjust selection
}
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::UndoTransaction(void)
{
NS_ENSURE_TRUE(mNode && mParent, NS_ERROR_NOT_INITIALIZED);
ErrorResult rv;
mParent->RemoveChild(*mNode, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP InsertElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertElementTxn");
return NS_OK;
}