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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_XULBroadcastManager_h
#define mozilla_dom_XULBroadcastManager_h
#include "nsAtom.h"
#include "nsTArray.h"
class PLDHashTable;
class nsXULElement;
namespace mozilla {
class ErrorResult;
namespace dom {
class Document;
class Element;
class XULBroadcastManager final {
public:
explicit XULBroadcastManager(Document* aDocument);
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(XULBroadcastManager)
/**
* Checks whether an element uses any of the special broadcaster attributes
* or is an observes element. This mimics the logic in FindBroadcaster, but
* is intended to be a lighter weight check and doesn't actually guarantee
* that the element will need a listener.
*/
static bool MayNeedListener(const Element& aElement);
nsresult AddListener(Element* aElement);
nsresult RemoveListener(Element* aElement);
void AttributeChanged(Element* aElement, int32_t aNameSpaceID,
nsAtom* aAttribute);
void MaybeBroadcast();
void DropDocumentReference(); // notification that doc is going away
protected:
enum HookupAction { eHookupAdd = 0, eHookupRemove };
nsresult UpdateListenerHookup(Element* aElement, HookupAction aAction);
void RemoveListenerFor(Element& aBroadcaster, Element& aListener,
const nsAString& aAttr);
void AddListenerFor(Element& aBroadcaster, Element& aListener,
const nsAString& aAttr, ErrorResult& aRv);
nsresult ExecuteOnBroadcastHandlerFor(Element* aBroadcaster,
Element* aListener, nsAtom* aAttr);
// The out params of FindBroadcaster only have values that make sense when
// the method returns NS_FINDBROADCASTER_FOUND. In all other cases, the
// values of the out params should not be relied on (though *aListener and
// *aBroadcaster do need to be released if non-null, of course).
nsresult FindBroadcaster(Element* aElement, Element** aListener,
nsString& aBroadcasterID, nsString& aAttribute,
Element** aBroadcaster);
void SynchronizeBroadcastListener(Element* aBroadcaster, Element* aListener,
const nsAString& aAttr);
// This reference is nulled by the Document in it's destructor through
// DropDocumentReference().
Document* MOZ_NON_OWNING_REF mDocument;
/**
* A map from a broadcaster element to a list of listener elements.
*/
PLDHashTable* mBroadcasterMap;
class nsDelayedBroadcastUpdate;
nsTArray<nsDelayedBroadcastUpdate> mDelayedBroadcasters;
nsTArray<nsDelayedBroadcastUpdate> mDelayedAttrChangeBroadcasts;
bool mHandlingDelayedAttrChange;
bool mHandlingDelayedBroadcasters;
private:
~XULBroadcastManager();
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_XULBroadcastManager_h