1 | /* |
2 | * Copyright (C) 2008 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 "RenderBlock.h" |
29 | #include "ScrollTypes.h" |
30 | |
31 | namespace WebCore { |
32 | |
33 | class RenderScrollbar; |
34 | |
35 | class RenderScrollbarPart final : public RenderBlock { |
36 | WTF_MAKE_ISO_ALLOCATED(RenderScrollbarPart); |
37 | public: |
38 | RenderScrollbarPart(Document&, RenderStyle&&, RenderScrollbar* = nullptr, ScrollbarPart = NoPart); |
39 | |
40 | virtual ~RenderScrollbarPart(); |
41 | |
42 | const char* renderName() const override { return "RenderScrollbarPart" ; } |
43 | |
44 | bool requiresLayer() const override { return false; } |
45 | |
46 | void layout() override; |
47 | |
48 | void paintIntoRect(GraphicsContext&, const LayoutPoint&, const LayoutRect&); |
49 | |
50 | // Scrollbar parts needs to be rendered at device pixel boundaries. |
51 | LayoutUnit marginTop() const override { ASSERT(isIntegerValue(m_marginBox.top())); return m_marginBox.top(); } |
52 | LayoutUnit marginBottom() const override { ASSERT(isIntegerValue(m_marginBox.bottom())); return m_marginBox.bottom(); } |
53 | LayoutUnit marginLeft() const override { ASSERT(isIntegerValue(m_marginBox.left())); return m_marginBox.left(); } |
54 | LayoutUnit marginRight() const override { ASSERT(isIntegerValue(m_marginBox.right())); return m_marginBox.right(); } |
55 | |
56 | RenderBox* rendererOwningScrollbar() const; |
57 | |
58 | protected: |
59 | void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; |
60 | void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override; |
61 | |
62 | private: |
63 | bool isRenderScrollbarPart() const override { return true; } |
64 | void computePreferredLogicalWidths() override; |
65 | |
66 | void layoutHorizontalPart(); |
67 | void layoutVerticalPart(); |
68 | |
69 | void computeScrollbarWidth(); |
70 | void computeScrollbarHeight(); |
71 | |
72 | RenderScrollbar* m_scrollbar; |
73 | ScrollbarPart m_part; |
74 | }; |
75 | |
76 | } // namespace WebCore |
77 | |
78 | SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderScrollbarPart, isRenderScrollbarPart()) |
79 | |