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//
// HotKeyController.m
//
// Modified by Gaurav Khanna on 8/17/10.
// SOURCE: http://github.com/sweetfm/SweetFM/blob/master/Source/HMediaKeys.m
// SOURCE: http://stackoverflow.com/questions/2969110/cgeventtapcreate-breaks-down-mysteriously-with-key-down-events
//
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify,
// merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#import "HotKeyController.h"
#import <IOKit/hidsystem/ev_keymap.h>
#import <sys/sysctl.h>
NSString* const MediaKeyPower = @"MediaKeyPower";
NSString* const MediaKeySoundMute = @"MediaKeySoundMute";
NSString* const MediaKeySoundUp = @"MediaKeySoundUp";
NSString* const MediaKeySoundDown = @"MediaKeySoundDown";
NSString* const MediaKeyPlayPauseNotification = @"MediaKeyPlayPauseNotification";
NSString* const MediaKeyFastNotification = @"MediaKeyFastNotification";
NSString* const MediaKeyRewindNotification = @"MediaKeyRewindNotification";
NSString* const MediaKeyNextNotification = @"MediaKeyNextNotification";
NSString* const MediaKeyPreviousNotification = @"MediaKeyPreviousNotification";
#ifndef kCGEventTapOptionDefault
#define kCGEventTapOptionDefault 0
#endif
#define NX_KEYSTATE_UP 0x0A
#define NX_KEYSTATE_DOWN 0x0B
@implementation HotKeyController
+ (HotKeyController*)sharedController
{
static HotKeyController *sharedHotKeyController = nil;
if (sharedHotKeyController == nil)
sharedHotKeyController = [[super allocWithZone:NULL] init];
return sharedHotKeyController;
}
+ (id)allocWithZone:(NSZone *)zone
{
return [[self sharedController] retain];
}
- (id)copyWithZone:(NSZone *)zone
{
return self;
}
- (id)retain
{
return self;
}
- (NSUInteger)retainCount
{
//denotes an object that cannot be released
return NSUIntegerMax;
}
- (oneway void)release
{
//do nothing
}
- (id)autorelease
{
return self;
}
- (CFMachPortRef)eventPort
{
return m_eventPort;
}
- (void)sysPower: (BOOL)enable;
{
m_controlSysPower = enable;
}
- (BOOL)controlPower;
{
return m_controlSysPower;
}
- (void)sysVolume: (BOOL)enable;
{
m_controlSysVolume = enable;
}
- (BOOL)controlVolume;
{
return m_controlSysVolume;
}
- (void)setActive: (BOOL)active
{
m_active = active;
}
- (BOOL)getActive
{
return m_active;
}
- (BOOL)getDebuggerActive
{
// Technical Q&A QA1361
// returns true if the current process is being debugged (either
// running under the debugger or has a debugger attached post facto).
int junk;
int mib[4];
struct kinfo_proc info;
size_t size;
// initialize the flags so that, if sysctl fails for some bizarre
// reason, we get a predictable result.
info.kp_proc.p_flag = 0;
// initialize mib, which tells sysctl the info we want, in this case
// we are looking for information about a specific process ID.
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = getpid();
// Call sysctl.
size = sizeof(info);
junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
assert(junk == 0);
// we are being debugged if the P_TRACED flag is set.
return ( (info.kp_proc.p_flag & P_TRACED) != 0 );
}
// WARNING: do not debugger breakpoint in this routine.
// It's a system level call back that taps ALL Events
// and you WILL lose all key control :)
static CGEventRef tapEventCallback2(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon)
{
HotKeyController *hot_key_controller = (HotKeyController*)refcon;
if (type == kCGEventTapDisabledByTimeout)
{
if ([hot_key_controller getActive])
CGEventTapEnable([hot_key_controller eventPort], TRUE);
return NULL;
}
if ((type != NX_SYSDEFINED) || (![hot_key_controller getActive]))
return event;
NSEvent *nsEvent = [NSEvent eventWithCGEvent:event];
if (!nsEvent || [nsEvent subtype] != 8)
return event;
int data = [nsEvent data1];
int keyCode = (data & 0xFFFF0000) >> 16;
int keyFlags = (data & 0xFFFF);
int keyState = (keyFlags & 0xFF00) >> 8;
BOOL keyIsRepeat = (keyFlags & 0x1) > 0;
if (keyIsRepeat)
return event;
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
switch (keyCode)
{
case NX_POWER_KEY:
if ([hot_key_controller controlPower])
{
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyPower object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
}
break;
case NX_KEYTYPE_MUTE:
if ([hot_key_controller controlVolume])
{
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeySoundMute object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
}
break;
case NX_KEYTYPE_SOUND_UP:
if ([hot_key_controller controlVolume])
{
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeySoundUp object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
}
break;
case NX_KEYTYPE_SOUND_DOWN:
if ([hot_key_controller controlVolume])
{
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeySoundDown object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
}
break;
case NX_KEYTYPE_PLAY:
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyPlayPauseNotification object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
break;
case NX_KEYTYPE_FAST:
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyFastNotification object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
break;
case NX_KEYTYPE_REWIND:
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyRewindNotification object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
break;
case NX_KEYTYPE_NEXT:
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyNextNotification object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
break;
case NX_KEYTYPE_PREVIOUS:
if (keyState == NX_KEYSTATE_DOWN)
[center postNotificationName:MediaKeyPreviousNotification object:(HotKeyController *)refcon];
if (keyState == NX_KEYSTATE_UP || keyState == NX_KEYSTATE_DOWN)
return NULL;
break;
}
return event;
}
static CGEventRef tapEventCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon)
{
NSAutoreleasePool *pool = [NSAutoreleasePool new];
CGEventRef ret = tapEventCallback2(proxy, type, event, refcon);
[pool drain];
return ret;
}
-(void)eventTapThread
{
m_runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorSystemDefault, m_eventPort, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), m_runLoopSource, kCFRunLoopCommonModes);
// Enable the event tap.
CGEventTapEnable(m_eventPort, TRUE);
CFRunLoopRun();
[self setActive:NO];
// Disable the event tap.
if (m_eventPort)
CGEventTapEnable(m_eventPort, FALSE);
if (m_runLoopSource)
CFRelease(m_runLoopSource);
m_runLoopSource = NULL;
if (m_eventPort)
CFRelease(m_eventPort);
m_eventPort = NULL;
}
- (id)init
{
if (self = [super init])
{
m_active = NO;
m_eventPort = NULL;
m_runLoopSource = NULL;
m_controlSysPower = NO;
m_controlSysVolume = NO;
}
return self;
}
- (void)enableTap
{
if (![self getDebuggerActive] && ![self getActive] && floor(NSAppKitVersionNumber) >= 949)
{
// check runtime, we only allow this on 10.5+
m_eventPort = CGEventTapCreate(kCGSessionEventTap,
kCGHeadInsertEventTap, kCGEventTapOptionDefault,
CGEventMaskBit(NX_SYSDEFINED), tapEventCallback, self);
if (m_eventPort != NULL)
{
// Run this in a separate thread so that a slow app
// doesn't lag the event tap
[NSThread detachNewThreadSelector:@selector(eventTapThread) toTarget:self withObject:nil];
[self setActive:YES];
}
}
}
- (void)disableTap
{
if ([self getActive])
{
[self setActive:NO];
// Disable the event tap.
if (m_eventPort)
CGEventTapEnable(m_eventPort, FALSE);
if (m_runLoopSource)
CFRelease(m_runLoopSource);
m_runLoopSource = NULL;
if (m_eventPort)
CFRelease(m_eventPort);
m_eventPort = NULL;
}
}
@end
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