gecko-dev/accessible/base/DocManager.h

195 строки
5.1 KiB
C++

/* 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 "nsIDocument.h"
#include "nsIDOMEventListener.h"
#include "nsRefPtrHashtable.h"
#include "nsIWebProgressListener.h"
#include "nsWeakReference.h"
#include "nsIPresShell.h"
#include "mozilla/StaticPtr.h"
namespace mozilla {
namespace a11y {
class Accessible;
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(nsIDocument* aDocument);
/**
* Return document accessible for the given presshell.
*/
DocAccessible* GetDocAccessible(const nsIPresShell* aPresShell)
{
if (!aPresShell)
return nullptr;
DocAccessible* doc = aPresShell->GetDocAccessible();
if (doc)
return doc;
return GetDocAccessible(aPresShell->GetDocument());
}
/**
* Search through all document accessibles for an accessible with the given
* unique id.
*/
Accessible* FindAccessibleInCache(nsINode* aNode) const;
/**
* Called by document accessible when it gets shutdown.
*/
void NotifyOfDocumentShutdown(DocAccessible* aDocument,
nsIDocument* aDOMDocument);
/**
* 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);
#ifdef DEBUG
bool IsProcessingRefreshDriverNotification() const;
#endif
protected:
DocManager();
virtual ~DocManager() { }
/**
* Initialize the manager.
*/
bool Init();
/**
* Shutdown the manager.
*/
void Shutdown();
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(nsIDocument* aDocument,
uint32_t aLoadEventType);
/**
* Add/remove 'pagehide' and 'DOMContentLoaded' event listeners.
*/
void AddListeners(nsIDocument *aDocument, bool aAddPageShowListener);
void RemoveListeners(nsIDocument* aDocument);
/**
* Create document or root accessible.
*/
DocAccessible* CreateDocOrRootAccessible(nsIDocument* aDocument);
/**
* Get first entry of the document accessible from cache.
*/
static PLDHashOperator
GetFirstEntryInDocCache(const nsIDocument* aKey,
DocAccessible* aDocAccessible,
void* aUserArg);
/**
* Clear the cache and shutdown the document accessibles.
*/
void ClearDocCache();
struct nsSearchAccessibleInCacheArg
{
Accessible* mAccessible;
nsINode* mNode;
};
static PLDHashOperator
SearchAccessibleInDocCache(const nsIDocument* aKey,
DocAccessible* aDocAccessible,
void* aUserArg);
#ifdef DEBUG
static PLDHashOperator
SearchIfDocIsRefreshing(const nsIDocument* aKey,
DocAccessible* aDocAccessible, void* aUserArg);
#endif
typedef nsRefPtrHashtable<nsPtrHashKey<const nsIDocument>, DocAccessible>
DocAccessibleHashtable;
DocAccessibleHashtable mDocAccessibleCache;
typedef nsRefPtrHashtable<nsPtrHashKey<const DocAccessible>, xpcAccessibleDocument>
XPCDocumentHashtable;
XPCDocumentHashtable mXPCDocumentCache;
/*
* 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.
*/
inline DocAccessible*
GetExistingDocAccessible(const nsIDocument* aDocument)
{
nsIPresShell* ps = aDocument->GetShell();
return ps ? ps->GetDocAccessible() : nullptr;
}
} // namespace a11y
} // namespace mozilla
#endif // mozilla_a11_DocManager_h_