1/*
2 * Copyright (C) 2017 Google 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 "DOMWindowProperty.h"
29#include "EventTarget.h"
30#include <wtf/RefCounted.h>
31
32namespace WebCore {
33
34class VisualViewport final : public RefCounted<VisualViewport>, public EventTargetWithInlineData, public DOMWindowProperty {
35 WTF_MAKE_ISO_ALLOCATED(VisualViewport);
36public:
37 static Ref<VisualViewport> create(DOMWindow& window) { return adoptRef(*new VisualViewport(window)); }
38
39 // EventTarget
40 EventTargetInterface eventTargetInterface() const final;
41 ScriptExecutionContext* scriptExecutionContext() const final;
42 bool addEventListener(const AtomicString& eventType, Ref<EventListener>&&, const AddEventListenerOptions&) final;
43
44 double offsetLeft() const;
45 double offsetTop() const;
46 double pageLeft() const;
47 double pageTop() const;
48 double width() const;
49 double height() const;
50 double scale() const;
51
52 void update();
53
54 using RefCounted::ref;
55 using RefCounted::deref;
56
57private:
58 explicit VisualViewport(DOMWindow&);
59
60 void refEventTarget() final { ref(); }
61 void derefEventTarget() final { deref(); }
62
63 void enqueueResizeEvent();
64 void enqueueScrollEvent();
65
66 void updateFrameLayout() const;
67
68 double m_offsetLeft { 0 };
69 double m_offsetTop { 0 };
70 double m_pageLeft { 0 };
71 double m_pageTop { 0 };
72 double m_width { 0 };
73 double m_height { 0 };
74 double m_scale { 1 };
75};
76
77} // namespace WebCore
78