| /* |
| * Copyright (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com) |
| * Copyright (C) 2006, 2007, 2008, 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. |
| * |
| */ |
| |
| #ifndef LayoutCounter_h |
| #define LayoutCounter_h |
| |
| #include "core/layout/LayoutText.h" |
| #include "core/style/CounterContent.h" |
| |
| namespace blink { |
| |
| class CounterNode; |
| |
| // LayoutCounter is used to represent the text of a counter. |
| // See http://www.w3.org/TR/CSS21/generate.html#counters |
| // |
| // Counters are always generated content ("content: counter(a)") thus this |
| // LayoutObject is always anonymous. |
| // |
| // CounterNodes is where the logic for knowing the value of a counter is. |
| // LayoutCounter makes sure the CounterNodes tree is consistent with the |
| // style. It then just queries CounterNodes for their values. |
| // |
| // CounterNodes are rare so they are stored in a map instead of growing |
| // LayoutObject. counterMaps() (in LayoutCounter.cpp) keeps the association |
| // between LayoutObject and CounterNodes. To avoid unneeded hash-lookups in the |
| // common case where there is no CounterNode, LayoutObject also keeps track of |
| // whether it has at least one CounterNode in the hasCounterNodeMap bit. |
| // |
| // Keeping the map up-to-date is the reason why LayoutObjects need to call into |
| // LayoutCounter during their lifetime (see the static functions below). |
| class LayoutCounter final : public LayoutText { |
| public: |
| LayoutCounter(Document*, const CounterContent&); |
| ~LayoutCounter() override; |
| |
| // These functions are static so that any LayoutObject can call them. |
| // The reason is that any LayoutObject in the tree can have a CounterNode |
| // without a LayoutCounter (e.g. by specifying 'counter-increment' without |
| // a "content: counter(a)" directive)). |
| static void destroyCounterNodes(LayoutObject&); |
| static void destroyCounterNode(LayoutObject&, const AtomicString& identifier); |
| static void layoutObjectSubtreeAttached(LayoutObject*); |
| static void layoutObjectSubtreeWillBeDetached(LayoutObject*); |
| static void layoutObjectStyleChanged(LayoutObject&, const ComputedStyle* oldStyle, const ComputedStyle& newStyle); |
| |
| void updateCounter(); |
| |
| const char* name() const override { return "LayoutCounter"; } |
| |
| protected: |
| void willBeDestroyed() override; |
| |
| private: |
| bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectCounter || LayoutText::isOfType(type); } |
| PassRefPtr<StringImpl> originalText() const override; |
| |
| // Removes the reference to the CounterNode associated with this layoutObject. |
| // This is used to cause a counter display update when the CounterNode tree changes. |
| void invalidate(); |
| |
| CounterContent m_counter; |
| CounterNode* m_counterNode; |
| LayoutCounter* m_nextForSameCounter; |
| friend class CounterNode; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutCounter, isCounter()); |
| |
| } // namespace blink |
| |
| #ifndef NDEBUG |
| // Outside the WebCore namespace for ease of invocation from gdb. |
| void showCounterLayoutTree(const blink::LayoutObject*, const char* counterName = nullptr); |
| #endif |
| |
| #endif // LayoutCounter_h |