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
31namespace WebCore {
32
33class RenderScrollbar;
34
35class RenderScrollbarPart final : public RenderBlock {
36 WTF_MAKE_ISO_ALLOCATED(RenderScrollbarPart);
37public:
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
58protected:
59 void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
60 void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
61
62private:
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
78SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderScrollbarPart, isRenderScrollbarPart())
79