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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 "DeleteNodeTransaction.h"
#include "HTMLEditUtils.h"
#include "mozilla/EditorBase.h"
#include "mozilla/SelectionState.h" // RangeUpdater
#include "mozilla/TextEditor.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsAString.h"
namespace mozilla {
// static
already_AddRefed<DeleteNodeTransaction> DeleteNodeTransaction::MaybeCreate(
EditorBase& aEditorBase, nsIContent& aContentToDelete) {
RefPtr<DeleteNodeTransaction> transaction =
new DeleteNodeTransaction(aEditorBase, aContentToDelete);
if (NS_WARN_IF(!transaction->CanDoIt())) {
return nullptr;
}
return transaction.forget();
}
DeleteNodeTransaction::DeleteNodeTransaction(EditorBase& aEditorBase,
nsIContent& aContentToDelete)
: mEditorBase(&aEditorBase),
mContentToDelete(&aContentToDelete),
mParentNode(aContentToDelete.GetParentNode()) {}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction, EditTransactionBase,
mEditorBase, mContentToDelete, mParentNode,
mRefContent)
NS_IMPL_ADDREF_INHERITED(DeleteNodeTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(DeleteNodeTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
bool DeleteNodeTransaction::CanDoIt() const {
if (NS_WARN_IF(!mContentToDelete) || NS_WARN_IF(!mEditorBase) ||
!mParentNode) {
return false;
}
return mEditorBase->IsTextEditor() ||
HTMLEditUtils::IsSimplyEditableNode(*mParentNode);
}
NS_IMETHODIMP DeleteNodeTransaction::DoTransaction() {
if (NS_WARN_IF(!CanDoIt())) {
return NS_OK;
}
if (mEditorBase->IsTextEditor() && mContentToDelete->IsText()) {
uint32_t length = mContentToDelete->AsText()->TextLength();
if (length > 0) {
mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
}
}
// Remember which child mContentToDelete was (by remembering which child was
// next). Note that mRefContent can be nullptr.
mRefContent = mContentToDelete->GetNextSibling();
// give range updater a chance. SelAdjDeleteNode() needs to be called
// *before* we do the action, unlike some of the other RangeItem update
// methods.
mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
OwningNonNull<nsINode> parentNode = *mParentNode;
OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
ErrorResult error;
parentNode->RemoveChild(contentToDelete, error);
NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
return error.StealNSResult();
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODIMP
DeleteNodeTransaction::UndoTransaction() {
if (NS_WARN_IF(!CanDoIt())) {
// This is a legal state, the transaction is a no-op.
return NS_OK;
}
ErrorResult error;
OwningNonNull<EditorBase> editorBase = *mEditorBase;
OwningNonNull<nsINode> parentNode = *mParentNode;
OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
nsCOMPtr<nsIContent> refContent = mRefContent;
// XXX Perhaps, we should check `refContent` is a child of `parentNode`,
// and if it's not, we should stop undoing or something.
parentNode->InsertBefore(contentToDelete, refContent, error);
// InsertBefore() may call MightThrowJSException() even if there is no error.
// We don't need the flag here.
error.WouldReportJSException();
if (error.Failed()) {
NS_WARNING("nsINode::InsertBefore() failed");
return error.StealNSResult();
}
if (editorBase->IsTextEditor() && contentToDelete->IsText()) {
uint32_t length = contentToDelete->AsText()->TextLength();
if (length > 0) {
nsresult rv = MOZ_KnownLive(editorBase->AsTextEditor())
->DidInsertText(length, 0, length);
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::DidInsertText() failed");
return rv;
}
}
}
return NS_OK;
}
NS_IMETHODIMP DeleteNodeTransaction::RedoTransaction() {
if (NS_WARN_IF(!CanDoIt())) {
// This is a legal state, the transaction is a no-op.
return NS_OK;
}
if (mEditorBase->IsTextEditor() && mContentToDelete->IsText()) {
uint32_t length = mContentToDelete->AsText()->TextLength();
if (length > 0) {
mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
}
}
mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
OwningNonNull<nsINode> parentNode = *mParentNode;
OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
ErrorResult error;
parentNode->RemoveChild(contentToDelete, error);
NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
return error.StealNSResult();
}
} // namespace mozilla
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