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 | |
33 | namespace WebCore { |
34 | |
35 | class Frame; |
36 | class Element; |
37 | class RenderBox; |
38 | class RenderScrollbarPart; |
39 | class RenderStyle; |
40 | |
41 | class RenderScrollbar final : public Scrollbar { |
42 | public: |
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 | |
61 | private: |
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 | |
93 | SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::RenderScrollbar) |
94 | static bool isType(const WebCore::Scrollbar& scrollbar) { return scrollbar.isCustomScrollbar(); } |
95 | SPECIALIZE_TYPE_TRAITS_END() |
96 | |