1/*
2 * Copyright (C) 2008, 2009, 2015 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "RenderPtr.h"
29#include "RenderStyleConstants.h"
30#include "Scrollbar.h"
31#include <wtf/HashMap.h>
32
33namespace WebCore {
34
35class Frame;
36class Element;
37class RenderBox;
38class RenderScrollbarPart;
39class RenderStyle;
40
41class RenderScrollbar final : public Scrollbar {
42public:
43 friend class Scrollbar;
44 static Ref<Scrollbar> createCustomScrollbar(ScrollableArea&, ScrollbarOrientation, Element*, Frame* owningFrame = nullptr);
45 virtual ~RenderScrollbar();
46
47 RenderBox* owningRenderer() const;
48
49 void paintPart(GraphicsContext&, ScrollbarPart, const IntRect&);
50
51 IntRect buttonRect(ScrollbarPart);
52 IntRect trackRect(int startLength, int endLength);
53 IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
54
55 int minimumThumbLength();
56
57 float opacity();
58
59 std::unique_ptr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
60
61private:
62 RenderScrollbar(ScrollableArea&, ScrollbarOrientation, Element*, Frame*);
63
64 bool isCustomScrollbar() const override { return true; }
65 bool isOverlayScrollbar() const override { return false; }
66
67 void setParent(ScrollView*) override;
68 void setEnabled(bool) override;
69
70 void paint(GraphicsContext&, const IntRect& damageRect, Widget::SecurityOriginPaintPolicy) override;
71
72 void setHoveredPart(ScrollbarPart) override;
73 void setPressedPart(ScrollbarPart) override;
74
75 void styleChanged() override;
76
77 void updateScrollbarParts();
78
79 void updateScrollbarPart(ScrollbarPart);
80
81 // This Scrollbar(Widget) may outlive the DOM which created it (during tear down),
82 // so we keep a reference to the Element which caused this custom scrollbar creation.
83 // This will not create a reference cycle as the Widget tree is owned by our containing
84 // FrameView which this Element pointer can in no way keep alive. See webkit bug 80610.
85 RefPtr<Element> m_ownerElement;
86
87 Frame* m_owningFrame;
88 HashMap<unsigned, RenderPtr<RenderScrollbarPart>> m_parts;
89};
90
91} // namespace WebCore
92
93SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::RenderScrollbar)
94 static bool isType(const WebCore::Scrollbar& scrollbar) { return scrollbar.isCustomScrollbar(); }
95SPECIALIZE_TYPE_TRAITS_END()
96