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02c7ccf532
Implement code to handle windows messages on a per-window basis. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@21916 72102866-910b-0410-8b05-ffd578937521
76 lines
2.4 KiB
Objective-C
76 lines
2.4 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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* The '_date' variable contains a date after which the event is useless
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* and the watcher can be removed from the runloop.
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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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* The 'data' variable is used to identify the resource/event that the
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* watcher is interested in.
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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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* To set this variable, the method adding the GSRunLoopWatcher to the
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* runloop must ask the 'receiver' (or its delegate) to supply a date
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* using the '[-limitDateForMode: ]' message.
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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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extern SEL eventSel; /* Initialized in [NSRunLoop +initialize] */
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@interface GSRunLoopWatcher: NSObject
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{
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@public
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NSDate *_date; /* First to match layout of NSTimer */
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BOOL _invalidated; /* 2nd to match layout of NSTimer */
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IMP handleEvent; /* New-style event handling */
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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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@end
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/*
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* Two optimisation functions that depend on a hack that the layout of
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* the NSTimer class is known to be the same as GSRunLoopWatcher for the
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* first two elements.
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*/
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static inline NSDate* timerDate(NSTimer* timer)
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{
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return ((GSRunLoopWatcher*)timer)->_date;
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}
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static inline BOOL timerInvalidated(NSTimer* timer)
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{
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return ((GSRunLoopWatcher*)timer)->_invalidated;
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}
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#endif /* __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE */
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