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// UKCarbonEventHandler.m
// TalkingMoose (XC2)
// Created by Uli Kusterer on 26.03.06.
// Copyright 2006 Uli Kusterer.
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source
// distribution.
#import <Carbon/Carbon.h>
#import "UKCarbonEventHandler.h"
// kEventClassApplication / kEventAppFrontSwitched
NSString* UKCarbonEventHandlerEventReceived = @"UKCarbonEventHandlerEventReceived";
OSStatus UKCarbonEventHandlerFunc( EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void *inUserData );
@implementation UKCarbonEventHandler
-(id) initWithEventClass: (UInt32)eclass kind: (UInt32)ekind
self = [super init];
if( self )
static EventHandlerUPP eventHandlerUPP = NULL; // Singleton used by all instances. Intentional "leak".
EventTypeSpec type;
if( !eventHandlerUPP )
eventHandlerUPP = NewEventHandlerUPP(UKCarbonEventHandlerFunc);
type.eventClass = eclass;
type.eventKind = ekind;
OSStatus err = InstallApplicationEventHandler( eventHandlerUPP, GetEventTypeCount(type), &type, self, &evtHandler );
if( err != noErr )
//UKLog( @"UKCarbonEventHandler: Couldn't install application event handler (Error No. %ld)", err );
[self autorelease];
return nil;
return self;
-(void) dealloc
RemoveEventHandler( evtHandler );
[super dealloc];
-(OSStatus) handleEvent: (EventRef)inEvent call: (EventHandlerCallRef)inHandlerCallRef
currCall = inHandlerCallRef;
currEvent = inEvent;
if( [self performEventActionAndPassOn] )
return eventNotHandledErr;
return noErr;
-(BOOL) callNextHandler
return( CallNextEventHandler( currCall, currEvent ) == noErr );
-(EventHandlerCallRef) currentCallRef
return currCall;
-(EventRef) currentEventRef
return currEvent;
-(BOOL) performEventActionAndPassOn
//UKLog(@"performEventActionAndPassOn self = %lx", (unsigned int)self);
[[NSNotificationCenter defaultCenter] postNotificationName: UKCarbonEventHandlerEventReceived object: self];
return YES;
OSStatus UKCarbonEventHandlerFunc( EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void *inUserData )
UKCarbonEventHandler* myself = (UKCarbonEventHandler*) inUserData;
OSStatus err = eventNotHandledErr;
err = [myself handleEvent: inEvent call: inHandlerCallRef];
NSLog( @"UKCarbonEventHandler: Error handling event: %@", localException );
return err;
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