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// Copyright 2015 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 SlotAssignment_h
#define SlotAssignment_h
// #include "core/dom/DocumentOrderedList.h"
#include "core/dom/DocumentOrderedMap.h"
#include "platform/heap/Handle.h"
#include "wtf/HashMap.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/AtomicStringHash.h"
namespace blink {
class HTMLSlotElement;
class Node;
class ShadowRoot;
// TODO(hayato): Support SlotAssignment for non-shadow trees, e.g. a document
// tree.
class SlotAssignment final : public GarbageCollected<SlotAssignment> {
public:
static SlotAssignment* create(ShadowRoot& owner) {
return new SlotAssignment(owner);
}
// Relevant DOM Standard: https://dom.spec.whatwg.org/#find-a-slot
HTMLSlotElement* findSlot(const Node&);
HTMLSlotElement* findSlotByName(const AtomicString& slotName);
// DOM Standaard defines these two procedures:
// 1. https://dom.spec.whatwg.org/#assign-a-slot
// void assignSlot(const Node& slottable);
// 2. https://dom.spec.whatwg.org/#assign-slotables
// void assignSlotables(HTMLSlotElement&);
// As an optimization, Blink does not implement these literally.
// Instead, provide alternative, HTMLSlotElement::hasAssignedNodesSlow()
// so that slotchange can be detected.
void resolveDistribution();
const HeapVector<Member<HTMLSlotElement>>& slots();
void didAddSlot(HTMLSlotElement&);
void slotRemoved(HTMLSlotElement&);
void slotRenamed(const AtomicString& oldName, HTMLSlotElement&);
void didChangeHostChildSlotName(const AtomicString& oldValue,
const AtomicString& newValue);
bool findHostChildBySlotName(const AtomicString& slotName) const;
DECLARE_TRACE();
private:
explicit SlotAssignment(ShadowRoot& owner);
void collectSlots();
void resolveAssignment();
void distributeTo(Node&, HTMLSlotElement&);
HeapVector<Member<HTMLSlotElement>> m_slots;
Member<DocumentOrderedMap> m_slotMap;
WeakMember<ShadowRoot> m_owner;
unsigned m_needsCollectSlots : 1;
unsigned m_slotCount : 31;
};
} // namespace blink
#endif // HTMLSlotAssignment_h
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