1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LayoutScrollbarPart_h
#define LayoutScrollbarPart_h
#include "core/layout/LayoutBlock.h"
#include "platform/scroll/ScrollTypes.h"
namespace blink {
class LayoutScrollbar;
class ScrollableArea;
class LayoutScrollbarPart final : public LayoutBlock {
public:
static LayoutScrollbarPart* createAnonymous(Document*,
ScrollableArea*,
LayoutScrollbar* = nullptr,
ScrollbarPart = NoPart);
~LayoutScrollbarPart() override;
const char* name() const override { return "LayoutScrollbarPart"; }
PaintLayerType layerTypeRequired() const override { return NoPaintLayer; }
void layout() override;
// Scrollbar parts needs to be rendered at device pixel boundaries.
LayoutRectOutsets marginBoxOutsets() const override {
ASSERT(isIntegerValue(LayoutBlock::marginBoxOutsets().top()));
return LayoutBlock::marginBoxOutsets();
}
LayoutUnit marginTop() const override {
ASSERT(isIntegerValue(LayoutBlock::marginTop()));
return LayoutBlock::marginTop();
}
LayoutUnit marginBottom() const override {
ASSERT(isIntegerValue(LayoutBlock::marginBottom()));
return LayoutBlock::marginBottom();
}
LayoutUnit marginLeft() const override {
ASSERT(isIntegerValue(LayoutBlock::marginLeft()));
return LayoutBlock::marginLeft();
}
LayoutUnit marginRight() const override {
ASSERT(isIntegerValue(LayoutBlock::marginRight()));
return LayoutBlock::marginRight();
}
bool isOfType(LayoutObjectType type) const override {
return type == LayoutObjectLayoutScrollbarPart ||
LayoutBlock::isOfType(type);
}
LayoutObject* layoutObjectOwningScrollbar() const;
// Must call setStyleWithWritingModeOfParent() instead.
void setStyle(PassRefPtr<ComputedStyle>) = delete;
LayoutRect visualRect() const override;
protected:
void styleWillChange(StyleDifference, const ComputedStyle& newStyle) override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
private:
LayoutScrollbarPart(ScrollableArea*, LayoutScrollbar*, ScrollbarPart);
void computePreferredLogicalWidths() override;
// Have all padding getters return 0. The important point here is to avoid
// resolving percents against the containing block, since scroll bar corners
// don't always have one (so it would crash). Scroll bar corners are not
// actually laid out, and they don't have child content, so what we return
// here doesn't really matter.
LayoutUnit paddingTop() const override { return LayoutUnit(); }
LayoutUnit paddingBottom() const override { return LayoutUnit(); }
LayoutUnit paddingLeft() const override { return LayoutUnit(); }
LayoutUnit paddingRight() const override { return LayoutUnit(); }
LayoutUnit paddingBefore() const override { return LayoutUnit(); }
LayoutUnit paddingAfter() const override { return LayoutUnit(); }
LayoutUnit paddingStart() const override { return LayoutUnit(); }
LayoutUnit paddingEnd() const override { return LayoutUnit(); }
void layoutHorizontalPart();
void layoutVerticalPart();
void computeScrollbarWidth();
void computeScrollbarHeight();
void setNeedsPaintInvalidation();
bool allowsOverflowClip() const override { return false; }
UntracedMember<ScrollableArea> m_scrollableArea;
UntracedMember<LayoutScrollbar> m_scrollbar;
ScrollbarPart m_part;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutScrollbarPart, isLayoutScrollbarPart());
} // namespace blink
#endif // LayoutScrollbarPart_h
|
