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#import "MASShortcut+Monitoring.h"
NSMutableDictionary *MASRegisteredHotKeys();
BOOL InstallCommonEventHandler();
void UninstallEventHandler();
void InstallHotkeyWithShortcut(MASShortcut *shortcut, UInt32 *outCarbonHotKeyID, EventHotKeyRef *outCarbonHotKey);
#pragma mark -
@interface MASShortcutHotKey : NSObject {
MASShortcut *_shortcut;
void (^_handler)();
EventHotKeyRef _carbonHotKey;
UInt32 _carbonHotKeyID;
}
@property (nonatomic, readonly) MASShortcut *shortcut;
@property (nonatomic, readonly, copy) void (^handler)();
@property (nonatomic, readonly) EventHotKeyRef carbonHotKey;
@property (nonatomic, readonly) UInt32 carbonHotKeyID;
- (id)initWithShortcut:(MASShortcut *)shortcut handler:(void (^)())handler;
@end
#pragma mark -
@implementation MASShortcut (Monitoring)
+ (id)addGlobalHotkeyMonitorWithShortcut:(MASShortcut *)shortcut handler:(void (^)())handler
{
NSString *monitor = [NSString stringWithFormat:@"%p: %@", shortcut, shortcut.description];
MASShortcutHotKey *hotKey = [[[MASShortcutHotKey alloc] initWithShortcut:shortcut handler:handler] autorelease];
[MASRegisteredHotKeys() setObject:hotKey forKey:monitor];
return monitor;
}
+ (void)removeGlobalHotkeyMonitor:(id)monitor
{
if (monitor == nil) return;
NSMutableDictionary *registeredHotKeys = MASRegisteredHotKeys();
[registeredHotKeys removeObjectForKey:monitor];
if (registeredHotKeys.count == 0) {
UninstallEventHandler();
}
}
@end
#pragma mark -
@implementation MASShortcutHotKey
@synthesize carbonHotKeyID = _carbonHotKeyID;
@synthesize handler = _handler;
@synthesize shortcut = _shortcut;
@synthesize carbonHotKey = _carbonHotKey;
#pragma mark -
- (id)initWithShortcut:(MASShortcut *)shortcut handler:(void (^)())handler
{
self = [super init];
if (self) {
_shortcut = [shortcut retain];
_handler = [handler copy];
InstallHotkeyWithShortcut(shortcut, &_carbonHotKeyID, &_carbonHotKey);
}
return self;
}
- (void)dealloc
{
[self uninstallExisitingHotKey];
[_shortcut release];
[_handler release];
[super dealloc];
}
- (void)uninstallExisitingHotKey
{
if (_carbonHotKey) {
UnregisterEventHotKey(_carbonHotKey);
_carbonHotKey = NULL;
}
}
@end
#pragma mark - Carbon magic
NSMutableDictionary *MASRegisteredHotKeys()
{
static NSMutableDictionary *shared = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shared = [[NSMutableDictionary alloc] init];
});
return shared;
}
#pragma mark -
FourCharCode const kMASShortcutSignature = 'MASS';
void InstallHotkeyWithShortcut(MASShortcut *shortcut, UInt32 *outCarbonHotKeyID, EventHotKeyRef *outCarbonHotKey)
{
if ((shortcut == nil) || !InstallCommonEventHandler()) return;
static UInt32 sCarbonHotKeyID = 0;
EventHotKeyID hotKeyID = { .signature = kMASShortcutSignature, .id = ++ sCarbonHotKeyID };
EventHotKeyRef carbonHotKey = NULL;
if (RegisterEventHotKey(shortcut.carbonKeyCode, shortcut.carbonFlags, hotKeyID, GetEventDispatcherTarget(), kEventHotKeyExclusive, &carbonHotKey) != noErr) {
carbonHotKey = NULL;
}
if (outCarbonHotKeyID) *outCarbonHotKeyID = hotKeyID.id;
if (outCarbonHotKey) *outCarbonHotKey = carbonHotKey;
}
static OSStatus CarbonCallback(EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void *inUserData)
{
if (GetEventClass(inEvent) != kEventClassKeyboard) return noErr;
EventHotKeyID hotKeyID;
OSStatus status = GetEventParameter(inEvent, kEventParamDirectObject, typeEventHotKeyID, NULL, sizeof(hotKeyID), NULL, &hotKeyID);
if (status != noErr) return status;
if (hotKeyID.signature != kMASShortcutSignature) return noErr;
[MASRegisteredHotKeys() enumerateKeysAndObjectsUsingBlock:^(id key, MASShortcutHotKey *hotKey, BOOL *stop) {
if (hotKeyID.id == hotKey.carbonHotKeyID) {
if (hotKey.handler) {
hotKey.handler();
}
*stop = YES;
}
}];
return noErr;
}
#pragma mark -
static EventHandlerRef sEventHandler = NULL;
BOOL InstallCommonEventHandler()
{
if (sEventHandler == NULL) {
EventTypeSpec hotKeyPressedSpec = { .eventClass = kEventClassKeyboard, .eventKind = kEventHotKeyPressed };
OSStatus status = InstallEventHandler(GetEventDispatcherTarget(), CarbonCallback, 1, &hotKeyPressedSpec, NULL, &sEventHandler);
if (status != noErr) {
sEventHandler = NULL;
return NO;
}
}
return YES;
}
void UninstallEventHandler()
{
if (sEventHandler) {
RemoveEventHandler(sEventHandler);
sEventHandler = NULL;
}
}
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