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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
ikilpatrick
2017/03/16 19:08:36
2017
atotic
2017/03/20 17:31:45
done
| |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "core/layout/ng/ng_relative_utils.h" | |
6 | |
7 #include "core/layout/ng/geometry/ng_logical_offset.h" | |
8 #include "core/style/ComputedStyle.h" | |
9 #include "platform/LengthFunctions.h" | |
10 #include "wtf/Optional.h" | |
11 | |
12 namespace blink { | |
13 | |
14 // Returns child's relative position wrt containing fragment. | |
15 NGLogicalOffset ComputeRelativeOffset(const ComputedStyle& child_style, | |
16 NGWritingMode container_writing_mode, | |
17 TextDirection container_direction, | |
18 NGLogicalSize container_size) { | |
19 NGLogicalOffset offset; | |
20 bool is_horizontal = | |
21 container_writing_mode == NGWritingMode::kHorizontalTopBottom; | |
22 | |
23 Optional<LayoutUnit> left, right, top, bottom; | |
24 | |
25 if (is_horizontal) { | |
26 if (!child_style.left().isAuto()) | |
27 left = valueForLength(child_style.left(), container_size.inline_size); | |
ikilpatrick
2017/03/16 19:08:36
would it be easier to just convert the container_s
atotic
2017/03/20 17:31:45
done. Thanks.
| |
28 if (!child_style.right().isAuto()) | |
29 right = valueForLength(child_style.right(), container_size.inline_size); | |
30 if (!child_style.top().isAuto()) | |
31 top = valueForLength(child_style.top(), container_size.block_size); | |
32 if (!child_style.bottom().isAuto()) | |
33 bottom = valueForLength(child_style.bottom(), container_size.block_size); | |
34 } else { | |
35 if (!child_style.left().isAuto()) | |
36 left = valueForLength(child_style.left(), container_size.block_size); | |
37 if (!child_style.right().isAuto()) | |
38 right = valueForLength(child_style.right(), container_size.block_size); | |
39 if (!child_style.top().isAuto()) | |
40 top = valueForLength(child_style.top(), container_size.inline_size); | |
41 if (!child_style.bottom().isAuto()) | |
42 bottom = valueForLength(child_style.bottom(), container_size.inline_size); | |
43 } | |
44 | |
45 // Implements confict resolution rules from spec: | |
46 // https://www.w3.org/TR/css-position-3/#rel-pos | |
47 if (!left && !right) { | |
48 left = LayoutUnit(); | |
49 right = LayoutUnit(); | |
50 } | |
51 if (!left) | |
52 left = -right.value(); | |
53 if (!right) | |
54 right = -left.value(); | |
55 if (!top && !bottom) { | |
56 top = LayoutUnit(); | |
57 bottom = LayoutUnit(); | |
58 } | |
59 if (!top) | |
60 top = -bottom.value(); | |
61 if (!bottom) | |
62 bottom = -top.value(); | |
63 | |
64 bool is_ltr = container_direction == TextDirection::kLtr; | |
65 | |
66 switch (container_writing_mode) { | |
67 case kHorizontalTopBottom: | |
68 offset.inline_offset = is_ltr ? left.value() : right.value(); | |
69 offset.block_offset = top.value(); | |
70 break; | |
71 case kVerticalRightLeft: | |
72 case kSidewaysRightLeft: | |
73 offset.inline_offset = is_ltr ? top.value() : bottom.value(); | |
74 offset.block_offset = right.value(); | |
75 break; | |
76 case kVerticalLeftRight: | |
77 offset.inline_offset = is_ltr ? top.value() : bottom.value(); | |
78 offset.block_offset = left.value(); | |
79 break; | |
80 case kSidewaysLeftRight: | |
81 offset.inline_offset = is_ltr ? bottom.value() : top.value(); | |
82 offset.block_offset = left.value(); | |
83 break; | |
84 } | |
85 return offset; | |
86 } | |
87 | |
88 } // namespace blink | |
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