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160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef _xp_observer_h_
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#define _xp_observer_h_
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#if 0
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#include "platform.h"
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#else
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#ifndef _platform_h_
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typedef int NS_Error;
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#endif
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#endif
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#include "prtypes.h"
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#include "prlog.h"
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typedef struct OpaqueObserverList *XP_ObserverList;
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typedef void* XP_Observable;
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typedef long XP_ObservableMsg;
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typedef void (*XP_ObserverProc) (
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XP_Observable inSource,
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XP_ObservableMsg inMsg,
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void* ioMsgData,
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void* ioClosure );
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PR_BEGIN_EXTERN_C
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/*
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Creates a new XP_ObserverList, with an assoicated XP_Observabe,
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to which you can add observers, who are notified when
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XP_NotifyObservers is called.
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Observerer notification is enabled by default.
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*/
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extern NS_Error
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XP_NewObserverList(
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XP_Observable inObservable,
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XP_ObserverList* outObserverList );
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/*
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Disposes of an XP_ObserverList. Does nothing with
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its observers.
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*/
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extern void
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XP_DisposeObserverList(
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XP_ObserverList inObserverList );
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/*
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Returns the XP_Observable associated with an XP_ObserverList
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*/
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extern XP_Observable
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XP_GetObserverListObservable(
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XP_ObserverList inObserverList);
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/*
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Change the observable associated with an observerlist
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*/
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extern void
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XP_SetObserverListObservable(
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XP_ObserverList inObserverList,
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XP_Observable inObservable);
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/*
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Registers a function pointer and void* closure
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as an "observer", which will be called whenever
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XP_NotifyObservers is called an observer notification
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is enabled.
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*/
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extern int
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XP_AddObserver(
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XP_ObserverList inObserverList,
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XP_ObserverProc inObserver,
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void* inClosure );
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/*
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Removes a registered observer. If there are duplicate
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(XP_ObserverProc/void* closure) pairs registered,
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it is undefined which one will be removed.
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Returns false if the observer is not registered.
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*/
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extern PRBool
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XP_RemoveObserver(
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XP_ObserverList inObserverList,
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XP_ObserverProc inObserver,
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void* inClosure );
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/*
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If observer notification is enabled for this XP_Observable,
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this will call each registered observer proc, passing it
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the given message and void* ioData, in addition to the
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observer's closure void*.
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There is no defined order in which observers are called.
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*/
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extern void
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XP_NotifyObservers(
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XP_ObserverList inObserverList,
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XP_ObservableMsg inMessage,
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void* ioData );
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/*
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When called, subsequent calls to XP_NotifyObservers
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will do nothing until XP_EnableObserverNotification
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is called.
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*/
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extern void
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XP_DisableObserverNotification(
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XP_ObserverList inObserverList );
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/*
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Enables calling observers when XP_NotifyObservers
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is invoked.
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*/
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extern void
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XP_EnableObserverNotification(
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XP_ObserverList inObserverList );
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/*
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Returns true if observer notification is enabled.
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*/
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extern PRBool
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XP_IsObserverNotificationEnabled(
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XP_ObserverList inObserverList );
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PR_END_EXTERN_C
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#endif /* #ifdef _xp_observer_h_ */
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