Index: third_party/WebKit/Source/core/layout/ng/ng_block_child_iterator.h |
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_child_iterator.h b/third_party/WebKit/Source/core/layout/ng/ng_block_child_iterator.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..0aee68ee038e46ac303fdcd0893cc926f2d92b1f |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_child_iterator.h |
@@ -0,0 +1,55 @@ |
+// Copyright 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef NGBlockChildIterator_h |
+#define NGBlockChildIterator_h |
+ |
+#include "core/CoreExport.h" |
+#include "platform/heap/Handle.h" |
+ |
+namespace blink { |
+ |
+class NGLayoutInputNode; |
+class NGBreakToken; |
+class NGBlockBreakToken; |
+ |
+// A utility class for block-flow layout which given the first child and a |
+// break token will iterate through unfinished children. |
+// |
+// This class does not handle modifications to its arguments after it has been |
+// constructed. |
+class CORE_EXPORT NGBlockChildIterator { |
+ public: |
+ NGBlockChildIterator(NGLayoutInputNode* first_child, |
+ NGBlockBreakToken* break_token); |
+ |
+ // Returns the next input node which should be laid out, along with its |
+ // respective break token. |
+ struct Entry; |
+ Entry NextChild(); |
+ |
+ private: |
+ Persistent<NGLayoutInputNode> child_; |
+ Persistent<NGBlockBreakToken> break_token_; |
+ |
+ // An index into break_token_'s ChildBreakTokens() vector. Used for keeping |
+ // track of the next child break token to inspect. |
+ size_t child_token_idx_; |
+}; |
+ |
+struct NGBlockChildIterator::Entry { |
+ Entry(NGLayoutInputNode* node, NGBreakToken* token) |
+ : node(node), token(token) {} |
+ |
+ Persistent<NGLayoutInputNode> node; |
+ Persistent<NGBreakToken> token; |
+ |
+ bool operator==(const NGBlockChildIterator::Entry& other) const { |
+ return node == other.node && token == other.token; |
+ } |
+}; |
+ |
+} // namespace blink |
+ |
+#endif // NGBlockChildIterator_h |