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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_shadowroot_h__
#define mozilla_dom_shadowroot_h__
#include "mozilla/dom/DocumentFragment.h"
#include "mozilla/dom/DocumentOrShadowRoot.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIContentInlines.h"
#include "nsIdentifierMapEntry.h"
#include "nsTHashtable.h"
#include "nsXBLBinding.h"
class nsIAtom;
class nsIContent;
class nsXBLPrototypeBinding;
namespace mozilla {
class EventChainPreVisitor;
namespace dom {
class Element;
class ShadowRoot final : public DocumentFragment,
public DocumentOrShadowRoot,
public nsStubMutationObserver
{
public:
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ShadowRoot,
DocumentFragment)
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
ShadowRoot(Element* aElement, bool aClosed,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
nsXBLPrototypeBinding* aProtoBinding);
// Shadow DOM v1
Element* Host();
ShadowRootMode Mode() const
{
return mMode;
}
bool IsClosed() const
{
return mMode == ShadowRootMode::Closed;
}
// [deprecated] Shadow DOM v0
void InsertSheet(StyleSheet* aSheet, nsIContent* aLinkingContent);
void RemoveSheet(StyleSheet* aSheet);
StyleSheetList* StyleSheets()
{
return &DocumentOrShadowRoot::EnsureDOMStyleSheets();
}
/**
* Clones internal state, for example stylesheets, of aOther to 'this'.
*/
void CloneInternalDataFrom(ShadowRoot* aOther);
/**
* Distributes all the explicit children of the pool host to the content
* insertion points in this ShadowRoot.
*/
void DistributeAllNodes();
private:
/**
* Try to reassign an element to a slot and returns whether the assignment
* changed.
*/
bool MaybeReassignElement(Element* aElement, const nsAttrValue* aOldValue);
/**
* Try to assign aContent to a slot in the shadow tree, returns the assigned
* slot if found.
*/
const HTMLSlotElement* AssignSlotFor(nsIContent* aContent);
/**
* Unassign aContent from the assigned slot in the shadow tree, returns the
* assigned slot if found.
*
* Note: slot attribute of aContent may have changed already, so pass slot
* name explicity here.
*/
const HTMLSlotElement* UnassignSlotFor(nsIContent* aContent,
const nsAString& aSlotName);
/**
* Called when we redistribute content after insertion points have changed.
*/
void DistributionChanged();
bool IsPooledNode(nsIContent* aChild) const;
public:
void AddSlot(HTMLSlotElement* aSlot);
void RemoveSlot(HTMLSlotElement* aSlot);
void SetInsertionPointChanged() { mInsertionPointChanged = true; }
nsXBLBinding* GetAssociatedBinding() { return mAssociatedBinding; }
void SetAssociatedBinding(nsXBLBinding* aBinding) { mAssociatedBinding = aBinding; }
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
static ShadowRoot* FromNode(nsINode* aNode);
void AddToIdTable(Element* aElement, nsIAtom* aId);
void RemoveFromIdTable(Element* aElement, nsIAtom* aId);
// WebIDL methods.
using mozilla::dom::DocumentOrShadowRoot::GetElementById;
Element* GetActiveElement();
void GetInnerHTML(nsAString& aInnerHTML);
void SetInnerHTML(const nsAString& aInnerHTML, ErrorResult& aError);
void StyleSheetChanged();
bool IsComposedDocParticipant() { return mIsComposedDocParticipant; }
void SetIsComposedDocParticipant(bool aIsComposedDocParticipant)
{
mIsComposedDocParticipant = aIsComposedDocParticipant;
}
nsresult GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
protected:
virtual ~ShadowRoot();
ShadowRootMode mMode;
// Map from name of slot to an array of all slots in the shadow DOM with with
// the given name. The slots are stored as a weak pointer because the elements
// are in the shadow tree and should be kept alive by its parent.
nsClassHashtable<nsStringHashKey, nsTArray<mozilla::dom::HTMLSlotElement*>> mSlotMap;
nsXBLPrototypeBinding* mProtoBinding;
// It is necessary to hold a reference to the associated nsXBLBinding
// because the binding holds a reference on the nsXBLDocumentInfo that
// owns |mProtoBinding|.
RefPtr<nsXBLBinding> mAssociatedBinding;
// A boolean that indicates that an insertion point was added or removed
// from this ShadowRoot and that the nodes need to be redistributed into
// the insertion points. After this flag is set, nodes will be distributed
// on the next mutation event.
bool mInsertionPointChanged;
// Flag to indicate whether the descendants of this shadow root are part of the
// composed document. Ideally, we would use a node flag on nodes to
// mark whether it is in the composed document, but we have run out of flags
// so instead we track it here.
bool mIsComposedDocParticipant;
nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_shadowroot_h__
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