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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gdl2/trunk@14993 72102866-910b-0410-8b05-ffd578937521
138 lines
3.4 KiB
Objective-C
138 lines
3.4 KiB
Objective-C
/*
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EOObserver.h
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Copyright (C) 2000 Free Software Foundation, Inc.
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Author: Mirko Viviani <mirko.viviani@rccr.cremona.it>
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Date: June 2000
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This file is part of the GNUstep Database Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; see the file COPYING.LIB.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __EOObserver_h__
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#define __EOObserver_h__
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#import <Foundation/Foundation.h>
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@interface NSObject (EOObserver)
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- (void)willChange;
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@end
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@protocol EOObserving <NSObject>
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- (void)objectWillChange: (id)subject;
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@end
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@interface EOObserverCenter : NSObject
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+ (void)addObserver: (id <EOObserving>)observer forObject: (id)object;
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+ (void)removeObserver: (id <EOObserving>)observer forObject: (id)object;
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+ (void)notifyObserversObjectWillChange: (id)object;
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+ (NSArray *)observersForObject: (id)object;
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+ (id)observerForObject: (id)object ofClass: (Class)targetClass;
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+ (void)suppressObserverNotification;
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+ (void)enableObserverNotification;
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+ (unsigned)observerNotificationSuppressCount;
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+ (void)addOmniscientObserver: (id <EOObserving>)observer;
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+ (void)removeOmniscientObserver: (id <EOObserving>)observer;
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@end
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@class EODelayedObserverQueue;
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typedef enum {
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EOObserverPriorityImmediate,
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EOObserverPriorityFirst,
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EOObserverPrioritySecond,
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EOObserverPriorityThird,
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EOObserverPriorityFourth,
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EOObserverPriorityFifth,
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EOObserverPrioritySixth,
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EOObserverPriorityLater
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} EOObserverPriority;
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#define EOObserverNumberOfPriorities ((unsigned)EOObserverPriorityLater + 1)
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@interface EODelayedObserver : NSObject <EOObserving> {
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@public
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EODelayedObserver *_next; // linked list. Nil if not on list.
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}
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- (void)objectWillChange: (id)subject;
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- (EOObserverPriority)priority;
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- (EODelayedObserverQueue *)observerQueue;
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// Must be implemented by subclasses
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- (void)subjectChanged;
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- (void)discardPendingNotification;
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@end
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// used with NSRunLoop's performSelector:target:argument:order:modes:
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enum {
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EOFlushDelayedObserversRunLoopOrdering = 400000
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};
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@interface EODelayedObserverQueue : NSObject
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{
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EODelayedObserver *_queue[EOObserverNumberOfPriorities]; // lists for each priority
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unsigned _highestNonEmptyQueue;
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BOOL _haveEntryInNotificationQueue;
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NSArray *_modes;
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}
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+ (EODelayedObserverQueue *)defaultObserverQueue;
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- (void)enqueueObserver: (EODelayedObserver *)observer;
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- (void)dequeueObserver: (EODelayedObserver *)observer;
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- (void)notifyObserversUpToPriority: (EOObserverPriority)lastPriority;
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- (void)setRunLoopModes: (NSArray *)modes;
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- (NSArray *)runLoopModes;
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@end
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@interface EOObserverProxy : EODelayedObserver {
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id _target;
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SEL _action;
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EOObserverPriority _priority;
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}
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- initWithTarget: (id)target
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action: (SEL)action
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priority: (EOObserverPriority)priority;
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@end
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#endif
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