1/*
2 * Copyright (C) 2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "ExceptionOr.h"
29#include <wtf/IsoMalloc.h>
30#include <wtf/Ref.h>
31#include <wtf/RefCounted.h>
32#include <wtf/RefPtr.h>
33#include <wtf/WeakPtr.h>
34
35namespace WebCore {
36
37class Document;
38class UndoItem;
39
40class UndoManager : public RefCounted<UndoManager>, public CanMakeWeakPtr<UndoManager> {
41 WTF_MAKE_ISO_ALLOCATED(UndoManager);
42public:
43 static Ref<UndoManager> create(Document& document)
44 {
45 return adoptRef(*new UndoManager(document));
46 }
47
48 ~UndoManager();
49
50 void removeItem(UndoItem&);
51 void removeAllItems();
52 ExceptionOr<void> addItem(Ref<UndoItem>&&);
53 Document& document() { return m_document; }
54
55private:
56 UndoManager(Document&);
57
58 Document& m_document;
59 HashSet<RefPtr<UndoItem>> m_items;
60};
61
62} // namespace WebCore
63