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// 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_INLINE_BREAK_TOKEN_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_INLINE_BREAK_TOKEN_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_node.h"
#include "third_party/blink/renderer/core/layout/ng/ng_break_token.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
namespace blink {
// Represents a break token for an inline node.
class CORE_EXPORT NGInlineBreakToken final : public NGBreakToken {
public:
enum NGInlineBreakTokenFlags {
kDefault = 0,
kIsForcedBreak = 1 << 0,
kUseFirstLineStyle = 1 << 1
// When adding values, ensure |flags_| has enough storage.
};
// Creates a break token for a node which did fragment, and can potentially
// produce more fragments.
// Takes ownership of the state_stack.
static scoped_refptr<NGInlineBreakToken> Create(
NGInlineNode node,
const ComputedStyle* style,
unsigned item_index,
unsigned text_offset,
unsigned flags /* NGInlineBreakTokenFlags */) {
return base::AdoptRef(new NGInlineBreakToken(
PassKey(), node, style, item_index, text_offset, flags));
}
// Creates a break token for a node which cannot produce any more fragments.
static scoped_refptr<NGInlineBreakToken> Create(NGLayoutInputNode node) {
return base::AdoptRef(new NGInlineBreakToken(PassKey(), node));
}
~NGInlineBreakToken() override;
// The style at the end of this break token. The next line should start with
// this style.
const ComputedStyle* Style() const {
DCHECK(!IsFinished());
return style_.get();
}
unsigned ItemIndex() const {
DCHECK(!IsFinished());
return item_index_;
}
unsigned TextOffset() const {
DCHECK(!IsFinished());
return text_offset_;
}
bool UseFirstLineStyle() const {
DCHECK(!IsFinished());
return flags_ & kUseFirstLineStyle;
}
bool IsForcedBreak() const {
DCHECK(!IsFinished());
return flags_ & kIsForcedBreak;
}
using PassKey = util::PassKey<NGInlineBreakToken>;
NGInlineBreakToken(PassKey,
NGInlineNode node,
const ComputedStyle*,
unsigned item_index,
unsigned text_offset,
unsigned flags /* NGInlineBreakTokenFlags */);
explicit NGInlineBreakToken(PassKey, NGLayoutInputNode node);
#if DCHECK_IS_ON()
String ToString() const override;
#endif
private:
scoped_refptr<const ComputedStyle> style_;
unsigned item_index_;
unsigned text_offset_;
};
template <>
struct DowncastTraits<NGInlineBreakToken> {
static bool AllowFrom(const NGBreakToken& token) {
return token.IsInlineType();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_INLINE_BREAK_TOKEN_H_
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