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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef NGBoxStrut_h |
| 6 #define NGBoxStrut_h |
| 7 |
| 8 #include "core/layout/ng/ng_writing_mode.h" |
| 9 #include "platform/LayoutUnit.h" |
| 10 #include "platform/text/TextDirection.h" |
| 11 |
| 12 namespace blink { |
| 13 |
| 14 // This struct is used for storing margins, borders or padding of a box on all |
| 15 // four edges. |
| 16 struct NGBoxStrut { |
| 17 NGBoxStrut() {} |
| 18 NGBoxStrut(LayoutUnit inline_start, |
| 19 LayoutUnit inline_end, |
| 20 LayoutUnit block_start, |
| 21 LayoutUnit block_end) |
| 22 : inline_start(inline_start), |
| 23 inline_end(inline_end), |
| 24 block_start(block_start), |
| 25 block_end(block_end) {} |
| 26 |
| 27 LayoutUnit InlineSum() const { return inline_start + inline_end; } |
| 28 LayoutUnit BlockSum() const { return block_start + block_end; } |
| 29 |
| 30 bool IsEmpty() const; |
| 31 |
| 32 // The following two operators exist primarily to have an easy way to access |
| 33 // the sum of border and padding. |
| 34 NGBoxStrut& operator+=(const NGBoxStrut& other) { |
| 35 inline_start += other.inline_start; |
| 36 inline_end += other.inline_end; |
| 37 block_start += other.block_start; |
| 38 block_end += other.block_end; |
| 39 return *this; |
| 40 } |
| 41 |
| 42 NGBoxStrut operator+(const NGBoxStrut& other) { |
| 43 NGBoxStrut result(*this); |
| 44 result += other; |
| 45 return result; |
| 46 } |
| 47 |
| 48 bool operator==(const NGBoxStrut& other) const; |
| 49 |
| 50 String ToString() const; |
| 51 |
| 52 LayoutUnit inline_start; |
| 53 LayoutUnit inline_end; |
| 54 LayoutUnit block_start; |
| 55 LayoutUnit block_end; |
| 56 }; |
| 57 |
| 58 std::ostream& operator<<(std::ostream&, const NGBoxStrut&); |
| 59 |
| 60 // Struct to store physical dimensions, independent of writing mode and |
| 61 // direction. |
| 62 // See https://drafts.csswg.org/css-writing-modes-3/#abstract-box |
| 63 struct NGPhysicalBoxStrut { |
| 64 LayoutUnit left; |
| 65 LayoutUnit right; |
| 66 LayoutUnit top; |
| 67 LayoutUnit bottom; |
| 68 NGBoxStrut ConvertToLogical(NGWritingMode, TextDirection) const; |
| 69 }; |
| 70 |
| 71 } // namespace blink |
| 72 |
| 73 #endif // NGBoxStrut_h |
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