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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef NGBlockBreakToken_h | 5 #ifndef NGBlockBreakToken_h |
6 #define NGBlockBreakToken_h | 6 #define NGBlockBreakToken_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "core/layout/ng/ng_break_token.h" | 9 #include "core/layout/ng/ng_break_token.h" |
10 #include "platform/LayoutUnit.h" | 10 #include "platform/LayoutUnit.h" |
11 | 11 |
12 namespace blink { | 12 namespace blink { |
13 | 13 |
14 class NGBlockNode; | 14 class NGBlockNode; |
15 | 15 |
16 // Represents a break token for a block node. | 16 // Represents a break token for a block node. |
17 class CORE_EXPORT NGBlockBreakToken : public NGBreakToken { | 17 class CORE_EXPORT NGBlockBreakToken : public NGBreakToken { |
18 public: | 18 public: |
19 // Creates a break token for a node which did fragment, and can potentially | 19 // Creates a break token for a node which did fragment, and can potentially |
20 // produce more fragments. | 20 // produce more fragments. |
21 // | 21 // |
22 // The NGBlockBreakToken takes ownership of child_break_tokens, leaving it | 22 // The NGBlockBreakToken takes ownership of child_break_tokens, leaving it |
23 // empty for the caller. | 23 // empty for the caller. |
24 // | 24 // |
25 // The node is NGBlockNode, or any other NGLayoutInputNode that produces | 25 // The node is NGBlockNode, or any other NGLayoutInputNode that produces |
26 // anonymous box. | 26 // anonymous box. |
27 static RefPtr<NGBlockBreakToken> Create( | 27 static RefPtr<NGBlockBreakToken> Create( |
28 NGLayoutInputNode* node, | 28 NGLayoutInputNode node, |
29 LayoutUnit used_block_size, | 29 LayoutUnit used_block_size, |
30 Vector<RefPtr<NGBreakToken>>& child_break_tokens) { | 30 Vector<RefPtr<NGBreakToken>>& child_break_tokens) { |
31 return AdoptRef( | 31 return AdoptRef( |
32 new NGBlockBreakToken(node, used_block_size, child_break_tokens)); | 32 new NGBlockBreakToken(node, used_block_size, child_break_tokens)); |
33 } | 33 } |
34 | 34 |
35 // Creates a break token for a node which cannot produce any more fragments. | 35 // Creates a break token for a node which cannot produce any more fragments. |
36 static RefPtr<NGBlockBreakToken> Create(NGLayoutInputNode* node) { | 36 static RefPtr<NGBlockBreakToken> Create(NGLayoutInputNode node) { |
37 return AdoptRef(new NGBlockBreakToken(node)); | 37 return AdoptRef(new NGBlockBreakToken(node)); |
38 } | 38 } |
39 | 39 |
40 // Represents the amount of block size used in previous fragments. | 40 // Represents the amount of block size used in previous fragments. |
41 // | 41 // |
42 // E.g. if the layout block specifies a block size of 200px, and the previous | 42 // E.g. if the layout block specifies a block size of 200px, and the previous |
43 // fragments of this block used 150px (used block size), the next fragment | 43 // fragments of this block used 150px (used block size), the next fragment |
44 // should have a size of 50px (assuming no additional fragmentation). | 44 // should have a size of 50px (assuming no additional fragmentation). |
45 LayoutUnit UsedBlockSize() const { return used_block_size_; } | 45 LayoutUnit UsedBlockSize() const { return used_block_size_; } |
46 | 46 |
47 // The break tokens for children of the layout node. | 47 // The break tokens for children of the layout node. |
48 // | 48 // |
49 // Each child we have visited previously in the block-flow layout algorithm | 49 // Each child we have visited previously in the block-flow layout algorithm |
50 // has an associated break token. This may be either finished (we should skip | 50 // has an associated break token. This may be either finished (we should skip |
51 // this child) or unfinished (we should try and produce the next fragment for | 51 // this child) or unfinished (we should try and produce the next fragment for |
52 // this child). | 52 // this child). |
53 // | 53 // |
54 // A child which we haven't visited yet doesn't have a break token here. | 54 // A child which we haven't visited yet doesn't have a break token here. |
55 const Vector<RefPtr<NGBreakToken>>& ChildBreakTokens() const { | 55 const Vector<RefPtr<NGBreakToken>>& ChildBreakTokens() const { |
56 return child_break_tokens_; | 56 return child_break_tokens_; |
57 } | 57 } |
58 | 58 |
59 private: | 59 private: |
60 NGBlockBreakToken(NGLayoutInputNode* node, | 60 NGBlockBreakToken(NGLayoutInputNode node, |
61 LayoutUnit used_block_size, | 61 LayoutUnit used_block_size, |
62 Vector<RefPtr<NGBreakToken>>& child_break_tokens); | 62 Vector<RefPtr<NGBreakToken>>& child_break_tokens); |
63 | 63 |
64 explicit NGBlockBreakToken(NGLayoutInputNode* node); | 64 explicit NGBlockBreakToken(NGLayoutInputNode node); |
65 | 65 |
66 LayoutUnit used_block_size_; | 66 LayoutUnit used_block_size_; |
67 Vector<RefPtr<NGBreakToken>> child_break_tokens_; | 67 Vector<RefPtr<NGBreakToken>> child_break_tokens_; |
68 }; | 68 }; |
69 | 69 |
70 DEFINE_TYPE_CASTS(NGBlockBreakToken, | 70 DEFINE_TYPE_CASTS(NGBlockBreakToken, |
71 NGBreakToken, | 71 NGBreakToken, |
72 token, | 72 token, |
73 token->IsBlockType(), | 73 token->IsBlockType(), |
74 token.IsBlockType()); | 74 token.IsBlockType()); |
75 | 75 |
76 } // namespace blink | 76 } // namespace blink |
77 | 77 |
78 #endif // NGBlockBreakToken_h | 78 #endif // NGBlockBreakToken_h |
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