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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "core/layout/ng/ng_block_child_iterator.h" | |
6 | |
7 #include "core/layout/ng/ng_block_break_token.h" | |
8 #include "core/layout/ng/ng_layout_input_node.h" | |
9 | |
10 namespace blink { | |
11 | |
12 NGBlockChildIterator::NGBlockChildIterator(NGLayoutInputNode* first_child, | |
13 NGBlockBreakToken* break_token) | |
14 : child_(first_child), break_token_(break_token), child_token_idx_(0) {} | |
15 | |
16 std::pair<NGLayoutInputNode*, NGBreakToken*> NGBlockChildIterator::NextChild() { | |
17 NGLayoutInputNode* child = nullptr; | |
Gleb Lanbin
2017/02/22 19:24:56
can you move this initialization to the line #52?
ikilpatrick
2017/02/22 20:25:27
Done.
| |
18 NGBreakToken* child_break_token = nullptr; | |
19 | |
20 if (break_token_) { | |
21 // If we're resuming layout after a fragmentainer break, we need to skip | |
22 // siblings that we're done with. We may have been able to fully lay out | |
23 // some node(s) preceding a node that we had to break inside (and therefore | |
24 // were not able to fully lay out). This happens when we have parallel | |
25 // flows [1], which are caused by floats, overflow, etc. | |
26 // | |
27 // [1] https://drafts.csswg.org/css-break/#parallel-flows | |
28 const auto& child_break_tokens = break_token_->ChildBreakTokens(); | |
29 | |
30 do { | |
31 // Early exit if we've exhausted our child break tokens. | |
32 if (child_token_idx_ >= child_break_tokens.size()) | |
33 break; | |
34 | |
35 // This child break token candidate doesn't match the current node, this | |
36 // node must be unfinished. | |
37 NGBreakToken* child_break_token_candidate = | |
38 child_break_tokens[child_token_idx_]; | |
39 if (child_break_token_candidate->InputNode() != child_) | |
40 break; | |
41 | |
42 ++child_token_idx_; | |
43 | |
44 // We have only found a node if its break token is unfinished. | |
45 if (!child_break_token_candidate->IsFinished()) { | |
46 child_break_token = child_break_token_candidate; | |
47 break; | |
48 } | |
49 } while ((child_ = child_->NextSibling())); | |
50 } | |
51 | |
52 child = child_; | |
53 if (child_) | |
54 child_ = child_->NextSibling(); | |
55 | |
56 return std::make_pair(child, child_break_token); | |
57 } | |
58 | |
59 } // namespace blink | |
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