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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SlotAssignment_h
#define SlotAssignment_h
#if ENABLE(SHADOW_DOM) || ENABLE(DETAILS_ELEMENT)
#include <functional>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/AtomicStringHash.h>
namespace WebCore {
class HTMLSlotElement;
class Node;
class ShadowRoot;
class SlotAssignment {
WTF_MAKE_NONCOPYABLE(SlotAssignment);
public:
using SlotNameFunction = std::function<AtomicString (const Node& child)>;
SlotAssignment();
SlotAssignment(SlotNameFunction);
~SlotAssignment() { }
static const AtomicString& defaultSlotName() { return emptyAtom; }
HTMLSlotElement* findAssignedSlot(const Node&, ShadowRoot&);
void addSlotElementByName(const AtomicString&, HTMLSlotElement&, ShadowRoot&);
void removeSlotElementByName(const AtomicString&, HTMLSlotElement&, ShadowRoot&);
const Vector<Node*>* assignedNodesForSlot(const HTMLSlotElement&, ShadowRoot&);
void invalidate(ShadowRoot&);
void invalidateDefaultSlot(ShadowRoot&);
private:
struct SlotInfo {
SlotInfo() { }
SlotInfo(HTMLSlotElement& slotElement)
: element(&slotElement)
, elementCount(1)
{ }
bool hasSlotElements() { return !!elementCount; }
bool hasDuplicatedSlotElements() { return elementCount > 1; }
bool shouldResolveSlotElement() { return !element && elementCount; }
HTMLSlotElement* element { nullptr };
unsigned elementCount { 0 };
Vector<Node*> assignedNodes;
};
HTMLSlotElement* findFirstSlotElement(SlotInfo&, ShadowRoot&);
void resolveAllSlotElements(ShadowRoot&);
void assignSlots(ShadowRoot&);
void assignToSlot(Node& child, const AtomicString& slotName);
SlotNameFunction m_slotNameFunction;
HashMap<AtomicString, std::unique_ptr<SlotInfo>> m_slots;
#ifndef NDEBUG
HashSet<HTMLSlotElement*> m_slotElementsForConsistencyCheck;
bool m_needsToResolveSlotElements { false };
#endif
bool m_slotAssignmentsIsValid { false };
};
}
#endif
#endif /* SlotAssignment_h */
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