OLD | NEW |
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 NGBlockBreakToken(NGBlockNode* node, | 24 NGBlockBreakToken(NGBlockNode* node, |
25 LayoutUnit used_block_size, | 25 LayoutUnit used_block_size, |
26 HeapVector<Member<NGBreakToken>>& child_break_tokens); | 26 HeapVector<Member<NGBreakToken>>& child_break_tokens); |
27 | 27 |
28 // Creates a break token for a node which cannot produce any more fragments. | 28 // Creates a break token for a node which cannot produce any more fragments. |
29 explicit NGBlockBreakToken(NGBlockNode* node); | 29 explicit NGBlockBreakToken(NGLayoutInputNode* node); |
30 | |
31 // TODO(ikilpatrick): Remove this constructor and break_offset once we've | |
32 // switched to new multi-col approach. | |
33 NGBlockBreakToken(NGBlockNode* node, LayoutUnit break_offset); | |
34 | 30 |
35 // Represents the amount of block size used in previous fragments. | 31 // Represents the amount of block size used in previous fragments. |
36 // | 32 // |
37 // E.g. if the layout block specifies a block size of 200px, and the previous | 33 // E.g. if the layout block specifies a block size of 200px, and the previous |
38 // fragments of this block used 150px (used block size), the next fragment | 34 // fragments of this block used 150px (used block size), the next fragment |
39 // should have a size of 50px (assuming no additional fragmentation). | 35 // should have a size of 50px (assuming no additional fragmentation). |
40 LayoutUnit UsedBlockSize() const { return used_block_size_; } | 36 LayoutUnit UsedBlockSize() const { return used_block_size_; } |
41 | 37 |
42 // The break tokens for children of the layout node. | 38 // The break tokens for children of the layout node. |
43 // | 39 // |
44 // Each child we have visited previously in the block-flow layout algorithm | 40 // Each child we have visited previously in the block-flow layout algorithm |
45 // has an associated break token. This may be either finished (we should skip | 41 // has an associated break token. This may be either finished (we should skip |
46 // this child) or unfinished (we should try and produce the next fragment for | 42 // this child) or unfinished (we should try and produce the next fragment for |
47 // this child). | 43 // this child). |
48 // | 44 // |
49 // A child which we haven't visited yet doesn't have a break token here. | 45 // A child which we haven't visited yet doesn't have a break token here. |
50 const HeapVector<Member<NGBreakToken>>& ChildBreakTokens() const { | 46 const HeapVector<Member<NGBreakToken>>& ChildBreakTokens() const { |
51 return child_break_tokens_; | 47 return child_break_tokens_; |
52 } | 48 } |
53 | 49 |
54 // TODO(ikilpatrick): Remove this accessor. | |
55 LayoutUnit BreakOffset() const { return break_offset_; } | |
56 | |
57 DEFINE_INLINE_VIRTUAL_TRACE() { | 50 DEFINE_INLINE_VIRTUAL_TRACE() { |
58 NGBreakToken::trace(visitor); | 51 NGBreakToken::trace(visitor); |
59 visitor->trace(child_break_tokens_); | 52 visitor->trace(child_break_tokens_); |
60 } | 53 } |
61 | 54 |
62 private: | 55 private: |
63 LayoutUnit break_offset_; | |
64 LayoutUnit used_block_size_; | 56 LayoutUnit used_block_size_; |
65 HeapVector<Member<NGBreakToken>> child_break_tokens_; | 57 HeapVector<Member<NGBreakToken>> child_break_tokens_; |
66 }; | 58 }; |
67 | 59 |
68 DEFINE_TYPE_CASTS(NGBlockBreakToken, | 60 DEFINE_TYPE_CASTS(NGBlockBreakToken, |
69 NGBreakToken, | 61 NGBreakToken, |
70 token, | 62 token, |
71 token->Type() == NGBreakToken::kBlockBreakToken, | 63 token->Type() == NGBreakToken::kBlockBreakToken, |
72 token.Type() == NGBreakToken::kBlockBreakToken); | 64 token.Type() == NGBreakToken::kBlockBreakToken); |
73 | 65 |
74 } // namespace blink | 66 } // namespace blink |
75 | 67 |
76 #endif // NGBlockBreakToken_h | 68 #endif // NGBlockBreakToken_h |
OLD | NEW |