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#import "MASShortcutView+UserDefaults.h"
#import "MASShortcut.h"
#import <objc/runtime.h>
@interface MASShortcutDefaultsObserver : NSObject
@property (nonatomic, readonly) NSString *userDefaultsKey;
@property (nonatomic, readonly, weak) MASShortcutView *shortcutView;
- (id)initWithShortcutView:(MASShortcutView *)shortcutView userDefaultsKey:(NSString *)userDefaultsKey;
@end
#pragma mark -
@implementation MASShortcutView (UserDefaults)
void *MASAssociatedDefaultsObserver = &MASAssociatedDefaultsObserver;
- (NSString *)associatedUserDefaultsKey
{
MASShortcutDefaultsObserver *defaultsObserver = objc_getAssociatedObject(self, MASAssociatedDefaultsObserver);
return defaultsObserver.userDefaultsKey;
}
- (void)setAssociatedUserDefaultsKey:(NSString *)associatedUserDefaultsKey
{
// First, stop observing previous shortcut view
objc_setAssociatedObject(self, MASAssociatedDefaultsObserver, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (associatedUserDefaultsKey.length == 0) return;
// Next, start observing current shortcut view
MASShortcutDefaultsObserver *defaultsObserver = [[MASShortcutDefaultsObserver alloc] initWithShortcutView:self userDefaultsKey:associatedUserDefaultsKey];
objc_setAssociatedObject(self, MASAssociatedDefaultsObserver, defaultsObserver, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
#pragma mark -
@implementation MASShortcutDefaultsObserver {
MASShortcut *_originalShortcut;
BOOL _internalPreferenceChange;
BOOL _internalShortcutChange;
}
- (id)initWithShortcutView:(MASShortcutView *)shortcutView userDefaultsKey:(NSString *)userDefaultsKey
{
self = [super init];
if (self) {
_originalShortcut = shortcutView.shortcutValue;
_shortcutView = shortcutView;
_userDefaultsKey = userDefaultsKey.copy;
[self startObservingShortcutView];
}
return self;
}
- (void)dealloc
{
// __weak _shortcutView is not yet deallocated because it refers MASShortcutDefaultsObserver
[self stopObservingShortcutView];
}
#pragma mark -
void *kShortcutValueObserver = &kShortcutValueObserver;
- (void)startObservingShortcutView
{
// Read initial shortcut value from user preferences
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = [defaults dataForKey:_userDefaultsKey];
_shortcutView.shortcutValue = [MASShortcut shortcutWithData:data];
// Observe user preferences to update shortcut value when it changed
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(userDefaultsDidChange:) name:NSUserDefaultsDidChangeNotification object:defaults];
// Observe the keyboard shortcut that user inputs by hand
[_shortcutView addObserver:self forKeyPath:@"shortcutValue" options:0 context:kShortcutValueObserver];
}
- (void)userDefaultsDidChange:(NSNotification *)note
{
// Ignore notifications posted from -[self observeValueForKeyPath:]
if (_internalPreferenceChange) return;
_internalShortcutChange = YES;
NSData *data = [note.object dataForKey:_userDefaultsKey];
_shortcutView.shortcutValue = [MASShortcut shortcutWithData:data];
_internalShortcutChange = NO;
}
- (void)stopObservingShortcutView
{
// Stop observing keyboard hotkeys entered by user in the shortcut view
[_shortcutView removeObserver:self forKeyPath:@"shortcutValue" context:kShortcutValueObserver];
// Stop observing user preferences
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSUserDefaultsDidChangeNotification object:[NSUserDefaults standardUserDefaults]];
// Restore original hotkey in the shortcut view
_shortcutView.shortcutValue = _originalShortcut;
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if (context == kShortcutValueObserver) {
if (_internalShortcutChange) return;
MASShortcut *shortcut = [object valueForKey:keyPath];
_internalPreferenceChange = YES;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:(shortcut.data ?: [NSKeyedArchiver archivedDataWithRootObject:nil]) forKey:_userDefaultsKey];
[defaults synchronize];
_internalPreferenceChange = NO;
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
@end
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