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#ifndef __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE
#define __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE
/**
Copyright (C) 2008-2009 Free Software Foundation, Inc.
By: Richard Frith-Macdonald <richard@brainstorm.co.uk>
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 31 Milk Street #960789 Boston, MA 02196 USA.
$Date$ $Revision$
*/
/*
* The 'GSRunLoopWatcher' class was written to permit the (relatively)
* easy addition of new events to be watched for in the runloop.
*
* To add a new type of event, the 'RunLoopEventType' enumeration must be
* extended, and the methods must be modified to handle the new type.
*
* The internal variables if the GSRunLoopWatcher are used as follows -
*
* If '_invalidated' is set, the watcher should be disabled and should
* be removed from the runloop when next encountered.
*
* If 'checkBlocking' is set, the run loop should ask the watcher
* whether it should block and/or trigger each loop iteration.
*
* The 'data' variable is used to identify the resource/event that the
* watcher is interested in. Its meaning is system dependent.
*
* The 'receiver' is the object which should be told when the event
* occurs. This object is NOT retained so that we can avoid retain
* loops. It is the responsibility of the receiver to invalidate
* the watcher before it is destroyed.
*
* The 'type' variable indentifies the type of event watched for.
* NSRunLoops [-acceptInputForMode: beforeDate: ] method MUST contain
* code to watch for events of each type.
*
* NB. This class is private to NSRunLoop and must not be subclassed.
*/
#import "common.h"
#import "Foundation/NSRunLoop.h"
@class NSDate;
@interface GSRunLoopWatcher: NSObject
{
@public
BOOL _invalidated;
BOOL checkBlocking;
void *data;
id receiver;
RunLoopEventType type;
unsigned count;
}
- (id) initWithType: (RunLoopEventType)type
receiver: (id)anObj
data: (void*)data;
/**
* Returns a boolean indicating whether the receiver needs the loop to
* block to wait for input, or whether the loop can run through at once.
* It also sets *trigger to say whether the receiver should be triggered
* once the input test has been done or not.
*/
- (BOOL) runLoopShouldBlock: (BOOL*)trigger;
@end
#endif /* __GSRunLoopWatcher_h_GNUSTEP_BASE_INCLUDE */
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