| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009 Apple Inc. |
| * All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| // 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 ListItemOrdinal_h |
| #define ListItemOrdinal_h |
| |
| #include "platform/heap/Persistent.h" |
| #include "platform/wtf/Optional.h" |
| |
| namespace blink { |
| |
| class HTMLOListElement; |
| class LayoutObject; |
| class Node; |
| |
| // Represents an "ordinal value" and its related algorithms: |
| // https://html.spec.whatwg.org/multipage/grouping-content.html#ordinal-value |
| // |
| // The ordinal value is determined by the DOM tree order. However, since any |
| // elements with 'display: list-item' can be list items, the layout tree |
| // provides the storage for the instances of this class, and is responsible for |
| // firing events for insertions and removals. |
| class ListItemOrdinal { |
| public: |
| ListItemOrdinal(); |
| |
| // Get the corresponding instance for a node. |
| static ListItemOrdinal* Get(const Node&); |
| |
| // Get the "ordinal value". |
| int Value(const Node&) const; |
| |
| // Get/set/clear the explicit value; i.e., the 'value' attribute of an <li> |
| // element. |
| Optional<int> ExplicitValue() const; |
| void SetExplicitValue(int, const Node&); |
| void ClearExplicitValue(const Node&); |
| |
| // Get/set whether this item is in a list or not. |
| bool NotInList() const { return not_in_list_; } |
| void SetNotInList(bool); |
| |
| static bool IsList(const Node&); |
| static bool IsListItem(const Node&); |
| static bool IsListItem(const LayoutObject*); |
| |
| // Compute the total item count of a list. |
| static unsigned ItemCountForOrderedList(const HTMLOListElement*); |
| |
| // Invalidate all ordinal values of a list. |
| static void InvalidateAllItemsForOrderedList(const HTMLOListElement*); |
| |
| // Invalidate items that are affected by an insertion or a removal. |
| static void ItemInsertedOrRemoved(const LayoutObject*); |
| |
| private: |
| enum ValueType { kNeedsUpdate, kUpdated, kExplicit }; |
| ValueType Type() const { return static_cast<ValueType>(type_); } |
| void SetType(ValueType type) const { type_ = type; } |
| bool HasExplicitValue() const { return type_ == kExplicit; } |
| |
| static Node* EnclosingList(const Node*); |
| struct NodeAndOrdinal { |
| STACK_ALLOCATED(); |
| Persistent<const Node> node; |
| ListItemOrdinal* ordinal = nullptr; |
| operator bool() const { return node; } |
| }; |
| static NodeAndOrdinal NextListItem(const Node* list_node, |
| const Node* item_node = nullptr); |
| static NodeAndOrdinal PreviousListItem(const Node* list_node, |
| const Node* item_node); |
| static NodeAndOrdinal NextOrdinalItem(bool is_reversed, |
| const Node* list_node, |
| const Node* item_node = nullptr); |
| |
| int CalcValue(const Node&) const; |
| |
| void InvalidateSelf(const Node&, ValueType = kNeedsUpdate); |
| static void InvalidateAfter(const Node* list_node, const Node* item_node); |
| static void InvalidateOrdinalsAfter(bool is_reversed, |
| const Node* list_node, |
| const Node* item_node); |
| |
| mutable int value_ = 0; |
| mutable unsigned type_ : 2; // ValueType |
| unsigned not_in_list_ : 1; |
| }; |
| |
| } // namespace blink |
| |
| #endif // ListItemOrdinal_h |