gecko-dev/editor/libeditor/InsertTextTxn.cpp

116 lines
3.2 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 "InsertTextTxn.h"
#include "mozilla/dom/Selection.h" // Selection local var
#include "mozilla/dom/Text.h" // mTextNode
#include "nsAString.h" // nsAString parameter
#include "nsDebug.h" // for NS_ASSERTION, etc
#include "nsEditor.h" // mEditor
#include "nsError.h" // for NS_OK, etc
using namespace mozilla;
using namespace mozilla::dom;
class nsITransaction;
InsertTextTxn::InsertTextTxn(Text& aTextNode, uint32_t aOffset,
const nsAString& aStringToInsert,
nsEditor& aEditor)
: EditTxn()
, mTextNode(&aTextNode)
, mOffset(aOffset)
, mStringToInsert(aStringToInsert)
, mEditor(aEditor)
{
}
InsertTextTxn::~InsertTextTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(InsertTextTxn, EditTxn,
mTextNode)
NS_IMPL_ADDREF_INHERITED(InsertTextTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(InsertTextTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertTextTxn)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsITransaction, InsertTextTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP
InsertTextTxn::DoTransaction()
{
nsresult res = mTextNode->InsertData(mOffset, mStringToInsert);
NS_ENSURE_SUCCESS(res, res);
// Only set selection to insertion point if editor gives permission
if (mEditor.GetShouldTxnSetSelection()) {
nsRefPtr<Selection> selection = mEditor.GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
res = selection->Collapse(mTextNode,
mOffset + mStringToInsert.Length());
NS_ASSERTION(NS_SUCCEEDED(res),
"Selection could not be collapsed after insert");
} else {
// Do nothing - DOM Range gravity will adjust selection
}
return NS_OK;
}
NS_IMETHODIMP
InsertTextTxn::UndoTransaction()
{
return mTextNode->DeleteData(mOffset, mStringToInsert.Length());
}
NS_IMETHODIMP
InsertTextTxn::Merge(nsITransaction* aTransaction, bool* aDidMerge)
{
if (!aTransaction || !aDidMerge) {
return NS_OK;
}
// Set out param default value
*aDidMerge = false;
// If aTransaction is a InsertTextTxn, and if the selection hasn't changed,
// then absorb it
nsRefPtr<InsertTextTxn> otherInsTxn = do_QueryObject(aTransaction);
if (otherInsTxn && IsSequentialInsert(*otherInsTxn)) {
nsAutoString otherData;
otherInsTxn->GetData(otherData);
mStringToInsert += otherData;
*aDidMerge = true;
}
return NS_OK;
}
NS_IMETHODIMP
InsertTextTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertTextTxn: ");
aString += mStringToInsert;
return NS_OK;
}
/* ============ private methods ================== */
void
InsertTextTxn::GetData(nsString& aResult)
{
aResult = mStringToInsert;
}
bool
InsertTextTxn::IsSequentialInsert(InsertTextTxn& aOtherTxn)
{
return aOtherTxn.mTextNode == mTextNode &&
aOtherTxn.mOffset == mOffset + mStringToInsert.Length();
}