зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.1 KiB
C++
129 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DeleteNodeTransaction.h"
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#include "mozilla/EditorBase.h"
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#include "mozilla/SelectionState.h" // RangeUpdater
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#include "nsDebug.h"
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#include "nsError.h"
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#include "nsAString.h"
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namespace mozilla {
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// static
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already_AddRefed<DeleteNodeTransaction> DeleteNodeTransaction::MaybeCreate(
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EditorBase& aEditorBase, nsINode& aNodeToDelete) {
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RefPtr<DeleteNodeTransaction> transaction =
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new DeleteNodeTransaction(aEditorBase, aNodeToDelete);
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if (NS_WARN_IF(!transaction->CanDoIt())) {
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return nullptr;
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}
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return transaction.forget();
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}
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DeleteNodeTransaction::DeleteNodeTransaction(EditorBase& aEditorBase,
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nsINode& aNodeToDelete)
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: mEditorBase(&aEditorBase),
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mNodeToDelete(&aNodeToDelete),
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mParentNode(aNodeToDelete.GetParentNode()) {}
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DeleteNodeTransaction::~DeleteNodeTransaction() {}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction, EditTransactionBase,
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mEditorBase, mNodeToDelete, mParentNode,
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mRefNode)
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NS_IMPL_ADDREF_INHERITED(DeleteNodeTransaction, EditTransactionBase)
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NS_IMPL_RELEASE_INHERITED(DeleteNodeTransaction, EditTransactionBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTransaction)
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NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
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bool DeleteNodeTransaction::CanDoIt() const {
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if (NS_WARN_IF(!mNodeToDelete) || NS_WARN_IF(!mEditorBase) || !mParentNode ||
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!mEditorBase->IsModifiableNode(*mParentNode)) {
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return false;
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}
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return true;
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}
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NS_IMETHODIMP
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DeleteNodeTransaction::DoTransaction() {
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if (NS_WARN_IF(!CanDoIt())) {
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return NS_OK;
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}
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if (!mEditorBase->AsHTMLEditor() && mNodeToDelete->IsText()) {
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uint32_t length = mNodeToDelete->AsText()->TextLength();
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if (length > 0) {
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mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
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}
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}
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// Remember which child mNodeToDelete was (by remembering which child was
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// next). Note that mRefNode can be nullptr.
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mRefNode = mNodeToDelete->GetNextSibling();
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// give range updater a chance. SelAdjDeleteNode() needs to be called
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// *before* we do the action, unlike some of the other RangeItem update
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// methods.
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mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(mNodeToDelete);
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ErrorResult error;
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mParentNode->RemoveChild(*mNodeToDelete, error);
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return error.StealNSResult();
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}
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MOZ_CAN_RUN_SCRIPT_BOUNDARY
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NS_IMETHODIMP
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DeleteNodeTransaction::UndoTransaction() {
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if (NS_WARN_IF(!CanDoIt())) {
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// This is a legal state, the transaction is a no-op.
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return NS_OK;
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}
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ErrorResult error;
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RefPtr<EditorBase> editorBase = mEditorBase;
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nsCOMPtr<nsINode> parent = mParentNode;
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nsCOMPtr<nsINode> nodeToDelete = mNodeToDelete;
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nsCOMPtr<nsIContent> refNode = mRefNode;
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parent->InsertBefore(*nodeToDelete, refNode, error);
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if (NS_WARN_IF(error.Failed())) {
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return error.StealNSResult();
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}
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if (!editorBase->AsHTMLEditor() && nodeToDelete->IsText()) {
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uint32_t length = nodeToDelete->AsText()->TextLength();
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if (length > 0) {
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error = MOZ_KnownLive(editorBase->AsTextEditor())
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->DidInsertText(length, 0, length);
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if (NS_WARN_IF(error.Failed())) {
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return error.StealNSResult();
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}
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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DeleteNodeTransaction::RedoTransaction() {
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if (NS_WARN_IF(!CanDoIt())) {
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// This is a legal state, the transaction is a no-op.
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return NS_OK;
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}
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if (!mEditorBase->AsHTMLEditor() && mNodeToDelete->IsText()) {
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uint32_t length = mNodeToDelete->AsText()->TextLength();
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if (length > 0) {
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mEditorBase->AsTextEditor()->WillDeleteText(length, 0, length);
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}
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}
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mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(mNodeToDelete);
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ErrorResult error;
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mParentNode->RemoveChild(*mNodeToDelete, error);
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return error.StealNSResult();
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}
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} // namespace mozilla
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