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/* 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_a11_DocManager_h_
#define mozilla_a11_DocManager_h_
#include "mozilla/ClearOnShutdown.h"
#include "nsIDOMEventListener.h"
#include "nsRefPtrHashtable.h"
#include "nsIWebProgressListener.h"
#include "nsWeakReference.h"
#include "mozilla/StaticPtr.h"
#include "nsINode.h"
namespace mozilla::dom {
class Document;
}
namespace mozilla {
class PresShell;
namespace a11y {
class LocalAccessible;
class DocAccessible;
class xpcAccessibleDocument;
class DocAccessibleParent;
/**
* Manage the document accessible life cycle.
*/
class DocManager : public nsIWebProgressListener,
public nsIDOMEventListener,
public nsSupportsWeakReference {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIWEBPROGRESSLISTENER
NS_DECL_NSIDOMEVENTLISTENER
/**
* Return document accessible for the given DOM node.
*/
DocAccessible* GetDocAccessible(dom::Document* aDocument);
/**
* Return document accessible for the given presshell.
*/
DocAccessible* GetDocAccessible(const PresShell* aPresShell);
/**
* Search through all document accessibles for an accessible with the given
* unique id.
*/
LocalAccessible* FindAccessibleInCache(nsINode* aNode) const;
/**
* Called by document accessible when it gets shutdown.
* @param aAllowServiceShutdown true to shut down nsAccessibilityService
* if it is no longer required, false to prevent it.
*/
void NotifyOfDocumentShutdown(DocAccessible* aDocument,
dom::Document* aDOMDocument,
bool aAllowServiceShutdown = true);
void RemoveFromXPCDocumentCache(DocAccessible* aDocument,
bool aAllowServiceShutdown = true);
/**
* Return XPCOM accessible document.
*/
xpcAccessibleDocument* GetXPCDocument(DocAccessible* aDocument);
xpcAccessibleDocument* GetCachedXPCDocument(DocAccessible* aDocument) const {
return mXPCDocumentCache.GetWeak(aDocument);
}
/*
* Notification that a top level document in a content process has gone away.
*/
static void RemoteDocShutdown(DocAccessibleParent* aDoc) {
DebugOnly<bool> result = sRemoteDocuments->RemoveElement(aDoc);
MOZ_ASSERT(result, "Why didn't we find the document!");
}
/*
* Notify of a new top level document in a content process.
*/
static void RemoteDocAdded(DocAccessibleParent* aDoc);
static const nsTArray<DocAccessibleParent*>* TopLevelRemoteDocs() {
return sRemoteDocuments;
}
/**
* Remove the xpc document for a remote document if there is one.
*/
static void NotifyOfRemoteDocShutdown(DocAccessibleParent* adoc);
static void RemoveFromRemoteXPCDocumentCache(DocAccessibleParent* aDoc);
/**
* Get a XPC document for a remote document.
*/
static xpcAccessibleDocument* GetXPCDocument(DocAccessibleParent* aDoc);
static xpcAccessibleDocument* GetCachedXPCDocument(
const DocAccessibleParent* aDoc) {
return sRemoteXPCDocumentCache ? sRemoteXPCDocumentCache->GetWeak(aDoc)
: nullptr;
}
#ifdef DEBUG
bool IsProcessingRefreshDriverNotification() const;
#endif
protected:
DocManager();
virtual ~DocManager() = default;
/**
* Initialize the manager.
*/
bool Init();
/**
* Shutdown the manager.
*/
void Shutdown();
bool HasXPCDocuments() {
return mXPCDocumentCache.Count() > 0 ||
(sRemoteXPCDocumentCache && sRemoteXPCDocumentCache->Count() > 0);
}
private:
DocManager(const DocManager&);
DocManager& operator=(const DocManager&);
private:
/**
* Create an accessible document if it was't created and fire accessibility
* events if needed.
*
* @param aDocument [in] loaded DOM document
* @param aLoadEventType [in] specifies the event type to fire load event,
* if 0 then no event is fired
*/
void HandleDOMDocumentLoad(dom::Document* aDocument, uint32_t aLoadEventType);
/**
* Add/remove 'pagehide' and 'DOMContentLoaded' event listeners.
*/
void AddListeners(dom::Document* aDocument, bool aAddPageShowListener);
void RemoveListeners(dom::Document* aDocument);
/**
* Create document or root accessible.
*/
DocAccessible* CreateDocOrRootAccessible(dom::Document* aDocument);
/**
* Clear the cache and shutdown the document accessibles.
*/
void ClearDocCache();
typedef nsRefPtrHashtable<nsPtrHashKey<const dom::Document>, DocAccessible>
DocAccessibleHashtable;
DocAccessibleHashtable mDocAccessibleCache;
typedef nsRefPtrHashtable<nsPtrHashKey<const DocAccessible>,
xpcAccessibleDocument>
XPCDocumentHashtable;
XPCDocumentHashtable mXPCDocumentCache;
static StaticAutoPtr<nsRefPtrHashtable<
nsPtrHashKey<const DocAccessibleParent>, xpcAccessibleDocument>>
sRemoteXPCDocumentCache;
/*
* The list of remote top level documents.
*/
static StaticAutoPtr<nsTArray<DocAccessibleParent*>> sRemoteDocuments;
};
/**
* Return the existing document accessible for the document if any.
* Note this returns the doc accessible for the primary pres shell if there is
* more than one.
*/
DocAccessible* GetExistingDocAccessible(const dom::Document* aDocument);
} // namespace a11y
} // namespace mozilla
#endif // mozilla_a11_DocManager_h_