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/* -*- 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 "DeleteTextTransaction.h"
#include "HTMLEditUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/EditorBase.h"
#include "mozilla/EditorDOMPoint.h"
#include "mozilla/SelectionState.h"
#include "mozilla/dom/Selection.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsISupportsImpl.h"
#include "nsAString.h"
namespace mozilla {
using namespace dom;
// static
already_AddRefed<DeleteTextTransaction> DeleteTextTransaction::MaybeCreate(
EditorBase& aEditorBase, Text& aTextNode, uint32_t aOffset,
uint32_t aLengthToDelete) {
RefPtr<DeleteTextTransaction> transaction = new DeleteTextTransaction(
aEditorBase, aTextNode, aOffset, aLengthToDelete);
return transaction.forget();
}
// static
already_AddRefed<DeleteTextTransaction>
DeleteTextTransaction::MaybeCreateForPreviousCharacter(EditorBase& aEditorBase,
Text& aTextNode,
uint32_t aOffset) {
if (NS_WARN_IF(!aOffset)) {
return nullptr;
}
nsAutoString data;
aTextNode.GetData(data);
if (NS_WARN_IF(data.IsEmpty())) {
return nullptr;
}
uint32_t length = 1;
uint32_t offset = aOffset - 1;
if (offset && NS_IS_SURROGATE_PAIR(data[offset - 1], data[offset])) {
++length;
--offset;
}
return DeleteTextTransaction::MaybeCreate(aEditorBase, aTextNode, offset,
length);
}
// static
already_AddRefed<DeleteTextTransaction>
DeleteTextTransaction::MaybeCreateForNextCharacter(EditorBase& aEditorBase,
Text& aTextNode,
uint32_t aOffset) {
nsAutoString data;
aTextNode.GetData(data);
if (NS_WARN_IF(aOffset >= data.Length()) || NS_WARN_IF(data.IsEmpty())) {
return nullptr;
}
uint32_t length = 1;
if (aOffset + 1 < data.Length() &&
NS_IS_SURROGATE_PAIR(data[aOffset], data[aOffset + 1])) {
++length;
}
return DeleteTextTransaction::MaybeCreate(aEditorBase, aTextNode, aOffset,
length);
}
DeleteTextTransaction::DeleteTextTransaction(EditorBase& aEditorBase,
Text& aTextNode, uint32_t aOffset,
uint32_t aLengthToDelete)
: mEditorBase(&aEditorBase),
mTextNode(&aTextNode),
mOffset(aOffset),
mLengthToDelete(aLengthToDelete) {
NS_ASSERTION(mTextNode->Length() >= aOffset + aLengthToDelete,
"Trying to delete more characters than in node");
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTransaction, EditTransactionBase,
mEditorBase, mTextNode)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
bool DeleteTextTransaction::CanDoIt() const {
if (NS_WARN_IF(!mTextNode) || NS_WARN_IF(!mEditorBase)) {
return false;
}
return mEditorBase->IsTextEditor() ||
HTMLEditUtils::IsSimplyEditableNode(*mTextNode);
}
NS_IMETHODIMP DeleteTextTransaction::DoTransaction() {
if (NS_WARN_IF(!CanDoIt())) {
return NS_ERROR_NOT_AVAILABLE;
}
// Get the text that we're about to delete
ErrorResult error;
mTextNode->SubstringData(mOffset, mLengthToDelete, mDeletedText, error);
if (error.Failed()) {
NS_WARNING("Text::SubstringData() failed");
return error.StealNSResult();
}
OwningNonNull<EditorBase> editorBase = *mEditorBase;
OwningNonNull<Text> textNode = *mTextNode;
editorBase->DoDeleteText(textNode, mOffset, mLengthToDelete, error);
if (error.Failed()) {
NS_WARNING("EditorBase::DoDeleteText() failed");
return error.StealNSResult();
}
editorBase->RangeUpdaterRef().SelAdjDeleteText(textNode, mOffset,
mLengthToDelete);
if (!editorBase->AllowsTransactionsToChangeSelection()) {
return NS_OK;
}
RefPtr<Selection> selection = editorBase->GetSelection();
if (NS_WARN_IF(!selection)) {
return NS_ERROR_FAILURE;
}
selection->CollapseInLimiter(EditorRawDOMPoint(textNode, mOffset), error);
NS_WARNING_ASSERTION(!error.Failed(),
"Selection::CollapseInLimiter() failed");
return error.StealNSResult();
}
// XXX: We may want to store the selection state and restore it properly. Was
// it an insertion point or an extended selection?
NS_IMETHODIMP DeleteTextTransaction::UndoTransaction() {
if (NS_WARN_IF(!CanDoIt())) {
return NS_ERROR_NOT_AVAILABLE;
}
RefPtr<EditorBase> editorBase = mEditorBase;
RefPtr<Text> textNode = mTextNode;
ErrorResult error;
editorBase->DoInsertText(*textNode, mOffset, mDeletedText, error);
NS_WARNING_ASSERTION(!error.Failed(), "EditorBase::DoInsertText() failed");
return error.StealNSResult();
}
} // namespace mozilla
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