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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), | |
cbiesinger
2017/02/15 19:23:19
Consider an enum instead of a bool?
ikilpatrick
2017/02/16 17:01:30
Yeah I looked at doing that, but decided against a
ikilpatrick
2017/02/16 17:02:10
I can also change if you feel strongly about this
cbiesinger
2017/02/16 22:03:49
Well, I think /* is_finished */ false looks hideou
| |
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 node specifies a block size of 200px and the used block | |
41 // size is 150px the next fragment should have a size of 50px (assuming no | |
cbiesinger
2017/02/15 19:24:22
Also, I'm confused by this comment. Typically bloc
ikilpatrick
2017/02/15 19:45:35
So consider this:
https://software.hixie.ch/utilit
cbiesinger1
2017/02/16 00:14:55
Oh I see. I missed the fact that 200px is the size
ikilpatrick
2017/02/16 17:01:30
Tried some rewording...
cbiesinger
2017/02/16 22:03:48
Thanks!
| |
42 // 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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