| /* |
| * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com) |
| * Copyright (C) 2006, 2007 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. |
| * |
| */ |
| |
| #ifndef CounterNode_h |
| #define CounterNode_h |
| |
| #include "platform/wtf/Forward.h" |
| #include "platform/wtf/RefCounted.h" |
| |
| // This implements a counter tree that is used for finding parents in counters() |
| // lookup, and for propagating count changes when nodes are added or removed. |
| |
| // Parents represent unique counters and their scope, which are created either |
| // explicitly by "counter-reset" style rules or implicitly by referring to a |
| // counter that is not in scope. |
| // Such nodes are tagged as "reset" nodes, although they are not all due to |
| // "counter-reset". |
| |
| // Not that layout tree children are often counter tree siblings due to counter |
| // scoping rules. |
| |
| namespace blink { |
| |
| class LayoutObject; |
| class LayoutCounter; |
| |
| class CounterNode : public RefCounted<CounterNode> { |
| public: |
| static scoped_refptr<CounterNode> Create(LayoutObject&, |
| bool is_reset, |
| int value); |
| ~CounterNode(); |
| bool ActsAsReset() const { return has_reset_type_ || !parent_; } |
| bool HasResetType() const { return has_reset_type_; } |
| int Value() const { return value_; } |
| int CountInParent() const { return count_in_parent_; } |
| LayoutObject& Owner() const { return owner_; } |
| void AddLayoutObject(LayoutCounter*); |
| void RemoveLayoutObject(LayoutCounter*); |
| |
| // Invalidates the text in the layoutObjects of this counter, if any. |
| void ResetLayoutObjects(); |
| |
| CounterNode* Parent() const { return parent_; } |
| CounterNode* PreviousSibling() const { return previous_sibling_; } |
| CounterNode* NextSibling() const { return next_sibling_; } |
| CounterNode* FirstChild() const { return first_child_; } |
| CounterNode* LastChild() const { return last_child_; } |
| CounterNode* LastDescendant() const; |
| CounterNode* PreviousInPreOrder() const; |
| CounterNode* NextInPreOrder(const CounterNode* stay_within = nullptr) const; |
| CounterNode* NextInPreOrderAfterChildren( |
| const CounterNode* stay_within = nullptr) const; |
| |
| void InsertAfter(CounterNode* new_child, |
| CounterNode* before_child, |
| const AtomicString& identifier); |
| |
| // identifier must match the identifier of this counter. |
| void RemoveChild(CounterNode*); |
| |
| // Moves all non-reset next siblings of first_node to be children of |
| // new_parent. Used when we insert new reset nodes that requires reparenting |
| // existing nodes. |
| static void MoveNonResetSiblingsToChildOf(CounterNode* first_node, |
| CounterNode& new_parent, |
| const AtomicString& identifier); |
| |
| private: |
| CounterNode(LayoutObject&, bool is_reset, int value); |
| int ComputeCountInParent() const; |
| // Invalidates the text in the layoutObject of this counter, if any, |
| // and in the layoutObjects of all descendants of this counter, if any. |
| void ResetThisAndDescendantsLayoutObjects(); |
| void Recount(); |
| |
| bool has_reset_type_; |
| int value_; |
| int count_in_parent_; |
| LayoutObject& owner_; |
| LayoutCounter* root_layout_object_; |
| |
| CounterNode* parent_; |
| CounterNode* previous_sibling_; |
| CounterNode* next_sibling_; |
| CounterNode* first_child_; |
| CounterNode* last_child_; |
| }; |
| |
| } // namespace blink |
| |
| #ifndef NDEBUG |
| // Outside the WebCore namespace for ease of invocation from gdb. |
| void showCounterTree(const blink::CounterNode*); |
| #endif |
| |
| #endif // CounterNode_h |