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NotificationController.h
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NotificationController.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alexander Surkov <surkov.alexander@gmail.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NotificationController_h_
#define NotificationController_h_
#include "AccEvent.h"
#include "nsCycleCollectionParticipant.h"
class nsAccessible;
class nsDocAccessible;
class nsIContent;
// Uncomment to log notifications processing.
//#define DEBUG_NOTIFICATIONS
#ifdef DEBUG_NOTIFICATIONS
#define DEBUG_CONTENTMUTATION
#define DEBUG_TEXTCHANGE
#endif
/**
* Notification interface.
*/
class Notification
{
public:
virtual ~Notification() { };
NS_INLINE_DECL_REFCOUNTING(Notification)
/**
* Process notification.
*/
virtual void Process() = 0;
protected:
Notification() { }
private:
Notification(const Notification&);
Notification& operator = (const Notification&);
};
/**
* Template class for generic notification.
*
* @note Instance is kept as a weak ref, the caller must guarantee it exists
* longer than the document accessible owning the notification controller
* that this notification is processed by.
*/
template<class Class, class Arg>
class TNotification : public Notification
{
public:
typedef void (Class::*Callback)(Arg*);
TNotification(Class* aInstance, Callback aCallback, Arg* aArg) :
mInstance(aInstance), mCallback(aCallback), mArg(aArg) { }
virtual ~TNotification() { mInstance = nsnull; }
virtual void Process()
{
(mInstance->*mCallback)(mArg);
mInstance = nsnull;
mCallback = nsnull;
mArg = nsnull;
}
private:
TNotification(const TNotification&);
TNotification& operator = (const TNotification&);
Class* mInstance;
Callback mCallback;
nsCOMPtr<Arg> mArg;
};
/**
* Used to process notifications from core for the document accessible.
*/
class NotificationController : public nsARefreshObserver
{
public:
NotificationController(nsDocAccessible* aDocument, nsIPresShell* aPresShell);
virtual ~NotificationController();
NS_IMETHOD_(nsrefcnt) AddRef(void);
NS_IMETHOD_(nsrefcnt) Release(void);
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(NotificationController)
/**
* Shutdown the notification controller.
*/
void Shutdown();
/**
* Put an accessible event into the queue to process it later.
*/
void QueueEvent(AccEvent* aEvent);
/**
* Schedule binding the child document to the tree of this document.
*/
void ScheduleChildDocBinding(nsDocAccessible* aDocument);
/**
* Schedule the accessible tree update because of rendered text changes.
*/
inline void ScheduleTextUpdate(nsIContent* aTextNode)
{
if (mTextHash.PutEntry(aTextNode))
ScheduleProcessing();
}
/**
* Pend accessible tree update for content insertion.
*/
void ScheduleContentInsertion(nsAccessible* aContainer,
nsIContent* aStartChildNode,
nsIContent* aEndChildNode);
/**
* Process the generic notification synchronously if there are no pending
* layout changes and no notifications are pending or being processed right
* now. Otherwise, queue it up to process asynchronously.
*
* @note The caller must guarantee that the given instance still exists when
* the notification is processed.
*/
template<class Class, class Arg>
inline void HandleNotification(Class* aInstance,
typename TNotification<Class, Arg>::Callback aMethod,
Arg* aArg)
{
if (!IsUpdatePending()) {
#ifdef DEBUG_NOTIFICATIONS
printf("\nsync notification processing\n");
#endif
(aInstance->*aMethod)(aArg);
return;
}
nsRefPtr<Notification> notification =
new TNotification<Class, Arg>(aInstance, aMethod, aArg);
if (notification && mNotifications.AppendElement(notification))
ScheduleProcessing();
}
/**
* Schedule the generic notification to process asynchronously.
*
* @note The caller must guarantee that the given instance still exists when
* the notification is processed.
*/
template<class Class, class Arg>
inline void ScheduleNotification(Class* aInstance,
typename TNotification<Class, Arg>::Callback aMethod,
Arg* aArg)
{
nsRefPtr<Notification> notification =
new TNotification<Class, Arg>(aInstance, aMethod, aArg);
if (notification && mNotifications.AppendElement(notification))
ScheduleProcessing();
}
protected:
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
/**
* Start to observe refresh to make notifications and events processing after
* layout.
*/
void ScheduleProcessing();
/**
* Return true if the accessible tree state update is pending.
*/
bool IsUpdatePending();
private:
NotificationController(const NotificationController&);
NotificationController& operator = (const NotificationController&);
// nsARefreshObserver
virtual void WillRefresh(mozilla::TimeStamp aTime);
// Event queue processing
/**
* Coalesce redundant events from the queue.
*/
void CoalesceEvents();
/**
* Apply aEventRule to same type event that from sibling nodes of aDOMNode.
* @param aEventsToFire array of pending events
* @param aStart start index of pending events to be scanned
* @param aEnd end index to be scanned (not included)
* @param aEventType target event type
* @param aDOMNode target are siblings of this node
* @param aEventRule the event rule to be applied
* (should be eDoNotEmit or eAllowDupes)
*/
void ApplyToSiblings(PRUint32 aStart, PRUint32 aEnd,
PRUint32 aEventType, nsINode* aNode,
AccEvent::EEventRule aEventRule);
/**
* Do not emit one of two given reorder events fired for DOM nodes in the case
* when one DOM node is in parent chain of second one.
*/
void CoalesceReorderEventsFromSameTree(AccEvent* aAccEvent,
AccEvent* aDescendantAccEvent);
/**
* Coalesce text change events caused by sibling hide events.
*/
void CoalesceTextChangeEventsFor(AccHideEvent* aTailEvent,
AccHideEvent* aThisEvent);
void CoalesceTextChangeEventsFor(AccShowEvent* aTailEvent,
AccShowEvent* aThisEvent);
/**
* Create text change event caused by hide or show event. When a node is
* hidden/removed or shown/appended, the text in an ancestor hyper text will
* lose or get new characters.
*/
void CreateTextChangeEventFor(AccMutationEvent* aEvent);
private:
/**
* Indicates whether we're waiting on an event queue processing from our
* notification controller to flush events.
*/
enum eObservingState {
eNotObservingRefresh,
eRefreshObserving,
eRefreshProcessingForUpdate
};
eObservingState mObservingState;
/**
* The document accessible reference owning this queue.
*/
nsRefPtr<nsDocAccessible> mDocument;
/**
* The presshell of the document accessible.
*/
nsIPresShell* mPresShell;
/**
* Child documents that needs to be bound to the tree.
*/
nsTArray<nsRefPtr<nsDocAccessible> > mHangingChildDocuments;
/**
* Storage for content inserted notification information.
*/
class ContentInsertion
{
public:
ContentInsertion(nsDocAccessible* aDocument, nsAccessible* aContainer);
virtual ~ContentInsertion() { mDocument = nsnull; }
NS_INLINE_DECL_REFCOUNTING(ContentInsertion)
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(ContentInsertion)
bool InitChildList(nsIContent* aStartChildNode, nsIContent* aEndChildNode);
void Process();
private:
ContentInsertion();
ContentInsertion(const ContentInsertion&);
ContentInsertion& operator = (const ContentInsertion&);
// The document used to process content insertion, matched to document of
// the notification controller that this notification belongs to, therefore
// it's ok to keep it as weak ref.
nsDocAccessible* mDocument;
// The container accessible that content insertion occurs within.
nsRefPtr<nsAccessible> mContainer;
// Array of inserted contents.
nsTArray<nsCOMPtr<nsIContent> > mInsertedContent;
};
/**
* A pending accessible tree update notifications for content insertions.
* Don't make this an nsAutoTArray; we use SwapElements() on it.
*/
nsTArray<nsRefPtr<ContentInsertion> > mContentInsertions;
template<class T>
class nsCOMPtrHashKey : public PLDHashEntryHdr
{
public:
typedef T* KeyType;
typedef const T* KeyTypePointer;
nsCOMPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}
nsCOMPtrHashKey(const nsPtrHashKey<T> &aToCopy) : mKey(aToCopy.mKey) {}
~nsCOMPtrHashKey() { }
KeyType GetKey() const { return mKey; }
PRBool KeyEquals(KeyTypePointer aKey) const { return aKey == mKey; }
static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
static PLDHashNumber HashKey(KeyTypePointer aKey)
{ return NS_PTR_TO_INT32(aKey) >> 2; }
enum { ALLOW_MEMMOVE = PR_TRUE };
protected:
nsCOMPtr<T> mKey;
};
/**
* A pending accessible tree update notifications for rendered text changes.
*/
nsTHashtable<nsCOMPtrHashKey<nsIContent> > mTextHash;
/**
* Update the accessible tree for pending rendered text change notifications.
*/
static PLDHashOperator TextEnumerator(nsCOMPtrHashKey<nsIContent>* aEntry,
void* aUserArg);
/**
* Other notifications like DOM events. Don't make this an nsAutoTArray; we
* use SwapElements() on it.
*/
nsTArray<nsRefPtr<Notification> > mNotifications;
/**
* Pending events array. Don't make this an nsAutoTArray; we use
* SwapElements() on it.
*/
nsTArray<nsRefPtr<AccEvent> > mEvents;
};
#endif