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#import "MASShortcutBinder.h"
#import "MASShortcut.h"
@interface MASShortcutBinder ()
@property(strong) NSMutableDictionary *actions;
@property(strong) NSMutableDictionary *shortcuts;
@end
@implementation MASShortcutBinder
#pragma mark Initialization
- (id) init
{
self = [super init];
[self setActions:[NSMutableDictionary dictionary]];
[self setShortcuts:[NSMutableDictionary dictionary]];
[self setShortcutMonitor:[MASShortcutMonitor sharedMonitor]];
[self setBindingOptions:@{NSValueTransformerNameBindingOption: NSKeyedUnarchiveFromDataTransformerName}];
return self;
}
- (void) dealloc
{
for (NSString *bindingName in [_actions allKeys]) {
[self unbind:bindingName];
}
}
+ (instancetype) sharedBinder
{
static dispatch_once_t once;
static MASShortcutBinder *sharedInstance;
dispatch_once(&once, ^{
sharedInstance = [[self alloc] init];
});
return sharedInstance;
}
#pragma mark Registration
- (void) bindShortcutWithDefaultsKey: (NSString*) defaultsKeyName toAction: (dispatch_block_t) action
{
[_actions setObject:[action copy] forKey:defaultsKeyName];
[self bind:defaultsKeyName toObject:[NSUserDefaultsController sharedUserDefaultsController]
withKeyPath:[@"values." stringByAppendingString:defaultsKeyName] options:_bindingOptions];
}
- (void) breakBindingWithDefaultsKey: (NSString*) defaultsKeyName
{
[_shortcutMonitor unregisterShortcut:[_shortcuts objectForKey:defaultsKeyName]];
[_shortcuts removeObjectForKey:defaultsKeyName];
[_actions removeObjectForKey:defaultsKeyName];
[self unbind:defaultsKeyName];
}
- (void) registerDefaultShortcuts: (NSDictionary*) defaultShortcuts
{
NSValueTransformer *transformer = [_bindingOptions valueForKey:NSValueTransformerBindingOption];
if (transformer == nil) {
NSString *transformerName = [_bindingOptions valueForKey:NSValueTransformerNameBindingOption];
if (transformerName) {
transformer = [NSValueTransformer valueTransformerForName:transformerName];
}
}
NSAssert(transformer != nil, @"Can’t register default shortcuts without a transformer.");
[defaultShortcuts enumerateKeysAndObjectsUsingBlock:^(NSString *defaultsKey, MASShortcut *shortcut, BOOL *stop) {
id value = [transformer reverseTransformedValue:shortcut];
[[NSUserDefaults standardUserDefaults] registerDefaults:@{defaultsKey:value}];
}];
}
#pragma mark Bindings
- (BOOL) isRegisteredAction: (NSString*) name
{
return !![_actions objectForKey:name];
}
- (id) valueForUndefinedKey: (NSString*) key
{
return [self isRegisteredAction:key] ?
[_shortcuts objectForKey:key] :
[super valueForUndefinedKey:key];
}
- (void) setValue: (id) value forUndefinedKey: (NSString*) key
{
if (![self isRegisteredAction:key]) {
[super setValue:value forUndefinedKey:key];
return;
}
MASShortcut *newShortcut = value;
MASShortcut *currentShortcut = [_shortcuts objectForKey:key];
// Unbind previous shortcut if any
if (currentShortcut != nil) {
[_shortcutMonitor unregisterShortcut:currentShortcut];
}
// Just deleting the old shortcut
if (newShortcut == nil) {
return;
}
// Bind new shortcut
[_shortcuts setObject:newShortcut forKey:key];
[_shortcutMonitor registerShortcut:newShortcut withAction:[_actions objectForKey:key]];
}
@end
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