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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.
*/
#pragma once
#include "ShadowRoot.h"
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
#include <wtf/WeakHashMap.h>
#include <wtf/WeakHashSet.h>
#include <wtf/WeakPtr.h>
#include <wtf/text/AtomString.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
class Element;
class HTMLSlotElement;
class Node;
class SlotAssignment {
WTF_MAKE_TZONE_ALLOCATED(SlotAssignment);
WTF_MAKE_NONCOPYABLE(SlotAssignment);
public:
SlotAssignment() = default;
virtual ~SlotAssignment() = default;
// These functions are only useful for NamedSlotAssignment but it's here to avoid virtual function calls in perf critical code paths.
void resolveSlotsBeforeNodeInsertionOrRemoval();
void willRemoveAllChildren();
virtual HTMLSlotElement* findAssignedSlot(const Node&) = 0;
virtual const Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>* assignedNodesForSlot(const HTMLSlotElement&, ShadowRoot&) = 0;
virtual void renameSlotElement(HTMLSlotElement&, const AtomString& oldName, const AtomString& newName, ShadowRoot&) = 0;
virtual void addSlotElementByName(const AtomString&, HTMLSlotElement&, ShadowRoot&) = 0;
virtual void removeSlotElementByName(const AtomString&, HTMLSlotElement&, ContainerNode* oldParentOfRemovedTreeForRemoval, ShadowRoot&) = 0;
virtual void slotManualAssignmentDidChange(HTMLSlotElement&, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& previous, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& current, ShadowRoot&) = 0;
virtual void didRemoveManuallyAssignedNode(HTMLSlotElement&, const Node&, ShadowRoot&) = 0;
virtual void slotFallbackDidChange(HTMLSlotElement&, ShadowRoot&) = 0;
virtual void hostChildElementDidChange(const Element&, ShadowRoot&) = 0;
virtual void hostChildElementDidChangeSlotAttribute(Element&, const AtomString& oldValue, const AtomString& newValue, ShadowRoot&) = 0;
virtual void willRemoveAssignedNode(const Node&, ShadowRoot&) = 0;
virtual void didRemoveAllChildrenOfShadowHost(ShadowRoot&) = 0;
virtual void didMutateTextNodesOfShadowHost(ShadowRoot&) = 0;
protected:
// These flags are used by NamedSlotAssignment but it's here to avoid virtual function calls in perf critical code paths.
bool m_slotAssignmentsIsValid { false };
bool m_willBeRemovingAllChildren { false };
unsigned m_slotMutationVersion { 0 };
};
class NamedSlotAssignment : public SlotAssignment {
WTF_MAKE_TZONE_ALLOCATED(NamedSlotAssignment);
WTF_MAKE_NONCOPYABLE(NamedSlotAssignment);
public:
NamedSlotAssignment();
virtual ~NamedSlotAssignment();
static const AtomString& defaultSlotName() { return emptyAtom(); }
protected:
void didChangeSlot(const AtomString&, ShadowRoot&);
private:
HTMLSlotElement* findAssignedSlot(const Node&) final;
void renameSlotElement(HTMLSlotElement&, const AtomString& oldName, const AtomString& newName, ShadowRoot&) final;
void addSlotElementByName(const AtomString&, HTMLSlotElement&, ShadowRoot&) final;
void removeSlotElementByName(const AtomString&, HTMLSlotElement&, ContainerNode* oldParentOfRemovedTreeForRemoval, ShadowRoot&) final;
void slotManualAssignmentDidChange(HTMLSlotElement&, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& previous, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& current, ShadowRoot&) final;
void didRemoveManuallyAssignedNode(HTMLSlotElement&, const Node&, ShadowRoot&) final;
void slotFallbackDidChange(HTMLSlotElement&, ShadowRoot&) final;
const Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>* assignedNodesForSlot(const HTMLSlotElement&, ShadowRoot&) final;
void willRemoveAssignedNode(const Node&, ShadowRoot&) final;
void didRemoveAllChildrenOfShadowHost(ShadowRoot&) final;
void didMutateTextNodesOfShadowHost(ShadowRoot&) final;
void hostChildElementDidChange(const Element&, ShadowRoot&) override;
void hostChildElementDidChangeSlotAttribute(Element&, const AtomString& oldValue, const AtomString& newValue, ShadowRoot&) final;
struct Slot {
WTF_MAKE_TZONE_ALLOCATED(Slot);
public:
bool hasSlotElements() { return !!elementCount; }
bool hasDuplicatedSlotElements() { return elementCount > 1; }
bool shouldResolveSlotElement() { return !element && elementCount; }
WeakPtr<HTMLSlotElement, WeakPtrImplWithEventTargetData> element;
WeakPtr<HTMLSlotElement, WeakPtrImplWithEventTargetData> oldElement; // Set by resolveSlotsAfterSlotMutation to dispatch slotchange in tree order.
unsigned elementCount { 0 };
bool seenFirstElement { false }; // Used in resolveSlotsAfterSlotMutation.
Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>> assignedNodes;
};
bool hasAssignedNodes(ShadowRoot&, Slot&);
enum class SlotMutationType { Insertion, Removal };
void resolveSlotsAfterSlotMutation(ShadowRoot&, SlotMutationType, ContainerNode* oldParentOfRemovedTree = nullptr);
virtual const AtomString& slotNameForHostChild(const Node&) const;
HTMLSlotElement* findFirstSlotElement(Slot&);
void assignSlots(ShadowRoot&);
void assignToSlot(Node& child, const AtomString& slotName);
unsigned m_slotResolutionVersion { 0 };
unsigned m_slotElementCount { 0 };
UncheckedKeyHashMap<AtomString, std::unique_ptr<Slot>> m_slots;
#if ASSERT_ENABLED
WeakHashSet<HTMLSlotElement, WeakPtrImplWithEventTargetData> m_slotElementsForConsistencyCheck;
#endif
};
class ManualSlotAssignment : public SlotAssignment {
public:
ManualSlotAssignment() = default;
HTMLSlotElement* findAssignedSlot(const Node&) final;
const Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>* assignedNodesForSlot(const HTMLSlotElement&, ShadowRoot&) final;
void renameSlotElement(HTMLSlotElement&, const AtomString&, const AtomString&, ShadowRoot&) final;
void addSlotElementByName(const AtomString&, HTMLSlotElement&, ShadowRoot&) final;
void removeSlotElementByName(const AtomString&, HTMLSlotElement&, ContainerNode*, ShadowRoot&) final;
void slotManualAssignmentDidChange(HTMLSlotElement&, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& previous, Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>>& current, ShadowRoot&) final;
void didRemoveManuallyAssignedNode(HTMLSlotElement&, const Node&, ShadowRoot&) final;
void slotFallbackDidChange(HTMLSlotElement&, ShadowRoot&) final;
void hostChildElementDidChange(const Element&, ShadowRoot&) final;
void hostChildElementDidChangeSlotAttribute(Element&, const AtomString&, const AtomString&, ShadowRoot&) final;
void willRemoveAssignedNode(const Node&, ShadowRoot&) final;
void didRemoveAllChildrenOfShadowHost(ShadowRoot&) final;
void didMutateTextNodesOfShadowHost(ShadowRoot&) final;
private:
struct Slot {
Vector<WeakPtr<Node, WeakPtrImplWithEventTargetData>> cachedAssignment;
uint64_t cachedVersion { 0 };
};
WeakHashMap<HTMLSlotElement, Slot, WeakPtrImplWithEventTargetData> m_slots;
uint64_t m_slottableVersion { 0 };
unsigned m_slotElementCount { 0 };
};
inline void SlotAssignment::resolveSlotsBeforeNodeInsertionOrRemoval()
{
m_slotMutationVersion++;
m_willBeRemovingAllChildren = false;
}
inline void SlotAssignment::willRemoveAllChildren()
{
m_slotMutationVersion++;
m_willBeRemovingAllChildren = true;
}
inline void ShadowRoot::resolveSlotsBeforeNodeInsertionOrRemoval()
{
if (UNLIKELY(m_slotAssignment))
m_slotAssignment->resolveSlotsBeforeNodeInsertionOrRemoval();
}
inline void ShadowRoot::willRemoveAllChildren(ContainerNode&)
{
if (UNLIKELY(m_slotAssignment))
m_slotAssignment->willRemoveAllChildren();
}
inline void ShadowRoot::didRemoveAllChildrenOfShadowHost()
{
if (UNLIKELY(m_slotAssignment))
m_slotAssignment->didRemoveAllChildrenOfShadowHost(*this);
}
inline void ShadowRoot::didMutateTextNodesOfShadowHost()
{
if (UNLIKELY(m_slotAssignment))
m_slotAssignment->didMutateTextNodesOfShadowHost(*this);
}
inline void ShadowRoot::hostChildElementDidChange(const Element& childElement)
{
if (UNLIKELY(m_slotAssignment))
m_slotAssignment->hostChildElementDidChange(childElement, *this);
}
inline void ShadowRoot::hostChildElementDidChangeSlotAttribute(Element& element, const AtomString& oldValue, const AtomString& newValue)
{
if (!m_slotAssignment)
return;
m_slotAssignment->hostChildElementDidChangeSlotAttribute(element, oldValue, newValue, *this);
}
inline void ShadowRoot::willRemoveAssignedNode(const Node& node)
{
if (m_slotAssignment)
m_slotAssignment->willRemoveAssignedNode(node, *this);
}
} // namespace WebCore
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