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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@22693 72102866-910b-0410-8b05-ffd578937521
61 lines
2 KiB
Objective-C
61 lines
2 KiB
Objective-C
#ifndef __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE
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#define __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE
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/*
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* The 'GSRunLoopWatcher' class was written to permit the (relatively)
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* easy addition of new events to be watched for in the runloop.
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*
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* To add a new type of event, the 'RunLoopEventType' enumeration must be
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* extended, and the methods must be modified to handle the new type.
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*
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* The internal variables if the GSRunLoopWatcher are used as follows -
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*
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* If '_invalidated' is set, the watcher should be disabled and should
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* be removed from the runloop when next encountered.
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*
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* If 'checkBlocking' is set, the run loop should ask the watcher
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* whether it should block and/or trigger each loop iteration.
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*
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* The 'data' variable is used to identify the resource/event that the
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* watcher is interested in. Its meaning is system dependent.
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*
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* The 'receiver' is the object which should be told when the event
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* occurs. This object is retained so that we know it will continue
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* to exist and can handle a callback.
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*
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* The 'type' variable indentifies the type of event watched for.
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* NSRunLoops [-acceptInputForMode: beforeDate: ] method MUST contain
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* code to watch for events of each type.
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*
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* NB. This class is private to NSRunLoop and must not be subclassed.
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*/
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#include "config.h"
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#include "GNUstepBase/preface.h"
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#include <Foundation/NSRunLoop.h>
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@class NSDate;
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@interface GSRunLoopWatcher: NSObject
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{
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@public
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BOOL _invalidated;
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BOOL checkBlocking;
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void *data;
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id receiver;
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RunLoopEventType type;
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unsigned count;
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}
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- (id) initWithType: (RunLoopEventType)type
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receiver: (id)anObj
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data: (void*)data;
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/**
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* Returns a boolean indicating whether the receiver needs the loop to
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* block to wait for input, or whether the loop can run through at once.
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* It also sets *trigger to say whether the receiver should be triggered
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* once the input test has been done or not.
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*/
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- (BOOL) runLoopShouldBlock: (BOOL*)trigger;
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@end
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#endif /* __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE */
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