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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/layout/ng/ng_break_token.h" | 8 #include "core/layout/ng/ng_break_token.h" |
9 #include "platform/LayoutUnit.h" | 9 #include "platform/LayoutUnit.h" |
10 | 10 |
11 namespace blink { | 11 namespace blink { |
12 | 12 |
13 class NGBlockNode; | 13 class NGBlockNode; |
14 | 14 |
| 15 // Represents a break token for a block node. |
15 class NGBlockBreakToken : public NGBreakToken { | 16 class NGBlockBreakToken : public NGBreakToken { |
16 public: | 17 public: |
| 18 // Creates a break token for a node which did fragment, and can potentially |
| 19 // produce more fragments. |
| 20 NGBlockBreakToken(NGBlockNode* node, |
| 21 LayoutUnit used_block_size, |
| 22 HeapVector<Member<NGBreakToken>>& child_break_tokens) |
| 23 : NGBreakToken(kBlockBreakToken, /* is_finished */ false, node), |
| 24 used_block_size_(used_block_size) { |
| 25 child_break_tokens_.swap(child_break_tokens); |
| 26 } |
| 27 |
| 28 // Creates a break token for a node which cannot produce any more fragments. |
| 29 explicit NGBlockBreakToken(NGBlockNode* node) |
| 30 : NGBreakToken(kBlockBreakToken, /* is_finished */ true, node) {} |
| 31 |
| 32 // TODO(ikilpatrick): Remove this constructor and break_offset once we've |
| 33 // switched to new multi-col approach. |
17 NGBlockBreakToken(NGBlockNode* node, LayoutUnit break_offset) | 34 NGBlockBreakToken(NGBlockNode* node, LayoutUnit break_offset) |
18 : NGBreakToken(kBlockBreakToken), | 35 : NGBreakToken(kBlockBreakToken, false, node), |
19 node_(node), | |
20 break_offset_(break_offset) {} | 36 break_offset_(break_offset) {} |
21 | 37 |
22 NGBlockNode& InputNode() const { return *node_.get(); } | 38 // Represents the amount of block size used in previous fragments. |
| 39 // |
| 40 // E.g. if the layout block specifies a block size of 200px, and the previous |
| 41 // fragments of this block used 150px (used block size), the next fragment |
| 42 // should have a size of 50px (assuming no additional fragmentation). |
| 43 LayoutUnit UsedBlockSize() const { return used_block_size_; } |
| 44 |
| 45 // The break tokens for children of the layout node. |
| 46 // |
| 47 // This is used to resume layout of any children which fragmented, it may |
| 48 // contain "finished" break tokens so we know which children to skip for the |
| 49 // next fragment. |
| 50 const HeapVector<Member<NGBreakToken>>& ChildBreakTokens() const { |
| 51 return child_break_tokens_; |
| 52 } |
| 53 |
| 54 // TODO(ikilpatrick): Remove this accessor. |
23 LayoutUnit BreakOffset() const { return break_offset_; } | 55 LayoutUnit BreakOffset() const { return break_offset_; } |
24 | 56 |
25 DEFINE_INLINE_VIRTUAL_TRACE() { | 57 DEFINE_INLINE_VIRTUAL_TRACE() { |
26 NGBreakToken::trace(visitor); | 58 NGBreakToken::trace(visitor); |
27 visitor->trace(node_); | 59 visitor->trace(child_break_tokens_); |
28 } | 60 } |
29 | 61 |
30 private: | 62 private: |
31 Member<NGBlockNode> node_; | |
32 LayoutUnit break_offset_; | 63 LayoutUnit break_offset_; |
| 64 LayoutUnit used_block_size_; |
| 65 HeapVector<Member<NGBreakToken>> child_break_tokens_; |
33 }; | 66 }; |
34 | 67 |
35 DEFINE_TYPE_CASTS(NGBlockBreakToken, | 68 DEFINE_TYPE_CASTS(NGBlockBreakToken, |
36 NGBreakToken, | 69 NGBreakToken, |
37 token, | 70 token, |
38 token->Type() == NGBreakToken::kBlockBreakToken, | 71 token->Type() == NGBreakToken::kBlockBreakToken, |
39 token.Type() == NGBreakToken::kBlockBreakToken); | 72 token.Type() == NGBreakToken::kBlockBreakToken); |
40 | 73 |
41 } // namespace blink | 74 } // namespace blink |
42 | 75 |
43 #endif // NGBlockBreakToken_h | 76 #endif // NGBlockBreakToken_h |
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