Using Notifications(Chapter 14 of Cocoa Programming for Mac OS X)

佘小宝的爹

PreferenceController

1 #import "PreferenceController.h"
2
3
4 @implementation PreferenceController
5
6 NSString * const BNRTableBgColorKey = @"TableBackgroundColor";
7 NSString * const BNREmptyDocKey = @"EmptyDocuementFlag";
8 NSString * const BNRColorChangedNotification = @"BNRColorChanged";
9
10 - (id)init
11 {
12     if(![super initWithWindowNibName:@"Preferences"])
13     {
14         return nil;
15     }
16     
17     return self;
18 }
19
20 - (NSColor *)tableBgColor
21 {
22     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
23     NSData *colorAsData = [defaults objectForKey:BNRTableBgColorKey];
24     return [NSKeyedUnarchiver unarchiveObjectWithData:colorAsData];
25 }
26
27 - (BOOL)emptyDoc
28 {
29     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
30     return [defaults boolForKey:BNREmptyDocKey];
31 }
32
33
34 - (void)windowDidLoad
35 {
36     [colorWell setColor:[self tableBgColor]];
37     [checkbox setState:[self emptyDoc]];
38     NSLog(@"Nib file is loaded");
39 }
40
41 - (IBAction)changeBackgroundColor:(id)sender
42 {
43     NSColor *color = [colorWell color];
44     NSData *colorAsData = [NSKeyedArchiver archivedDataWithRootObject:color];
45     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
46     [defaults setObject:colorAsData forKey:BNRTableBgColorKey];
47     NSLog(@"Color changed: %@", color);
48     
49     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
50     NSLog(@"Sending notification");
51     NSDictionary *d = [NSDictionary dictionaryWithObject:color forKey:@"color"];
52     [nc postNotificationName:BNRColorChangedNotification object:self userInfo:d];
53 }
54
55 - (IBAction)changeNewEmptyDoc:(id)sender
56 {
57     int state = [checkbox state];
58     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
59     [defaults setBool:state forKey:BNREmptyDocKey];
60     NSLog(@"Checkbox changed %d", state);
61 }
62
63 @end　　

MyDocument

  1 #import "PreferenceController.h"
  2 #import "MyDocument.h"
  3 #import "Person.h"
  4
  5 @implementation MyDocument
  6
  7 - (id)init
  8 {
  9     if (![super init])
10     {
11         return nil;
12     }
13     
14     employees = [[NSMutableArray alloc] init];
15     
16     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
17     [nc addObserver:self selector:@selector(handleColorChange:) name:BNRColorChangedNotification object:nil];
18     NSLog(@"Registered with notification center");
19     return self;
20 }
21
22 - (void)dealloc
23 {
24     [super setEmployees:nil];
25     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
26     [nc removeObserver:self];
27     [super dealloc];
28 }
29
30 - (void)handleColorChange:(NSNotification *)note
31 {
32     NSLog(@"Received notification: %@", note);
33     NSColor *color = [[note userInfo] objectForKey:@"color"];
34     [tableView setBackgroundColor:color];
35 }
36
37 - (void)setEmployees:(NSMutableArray *)a
38 {
39     if(a == employees)
40     {
41         return;
42     }
43     
44     for(Person *person in employees)
45     {
46         [self stopObservingPerson:person];
47     }
48     
49     [a retain];
50     [employees release];
51     employees = a;
52     
53     for(Person *person in employees)
54     {
55         [self startObservingPerson:person];
56     }
57 }
58
59 - (void)insertObject:(Person *)p inEmployeesAtIndex:(int)index
60 {
61     NSLog(@"adding %@ to %@", p, employees);
62     NSUndoManager *undo = [self undoManager];
63     [[undo prepareWithInvocationTarget:self] removeObjectFromEmployeesAtIndex:index];
64     if(![undo isUndoing])
65     {
66         [undo setActionName:@"Insert Person"];
67     }
68     [self startObservingPerson:p];
69     [employees insertObject:p atIndex:index];
70 }
71
72 - (void)removeObjectFromEmployeesAtIndex:(int)index
73 {
74     Person *p = [employees objectAtIndex:index];
75     NSLog(@"removing %@ from %@", p, employees);
76     NSUndoManager *undo = [self undoManager];
77     [[undo prepareWithInvocationTarget:self] insertObject:p inEmployeesAtIndex:index];
78     
79     if(![undo isUndoing])
80     {
81         [undo setActionName:@"Delete Person"];
82     }
83     [self stopObservingPerson:p];
84     [employees removeObjectAtIndex:index];
85 }
86
87 - (void)startObservingPerson:(Person *)person
88 {
89     [person addObserver:self forKeyPath:@"personName" options:NSKeyValueObservingOptionOld context:NULL];
90     [person    addObserver:self forKeyPath:@"expectedRaise" options:NSKeyValueObservingOptionOld context:NULL];
91 }
92
93 - (void)stopObservingPerson:(Person *)person
94 {
95     [person removeObserver:self forKeyPath:@"personName"];
96     [person    removeObserver:self forKeyPath:@"expectedRaise"];
97 }
98
99 - (void)changeKeyPath:(NSString *)keyPath ofObject:(id)obj toValue:(id)newValue
100 {
101     [obj setValue:newValue forKeyPath:keyPath];
102 }
103
104 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
105 {
106     NSUndoManager *undo = [self undoManager];
107     id oldValue = [change objectForKey:NSKeyValueChangeOldKey];
108     
109     if(oldValue == [NSNull null])
110     {
111         oldValue = nil;
112     }
113     
114     NSLog(@"oldValue = %@", oldValue);
115     [[undo prepareWithInvocationTarget:self] changeKeyPath:keyPath ofObject:object toValue:oldValue];
116     [undo setActionName:@"Edit"];
117 }
118
119 - (IBAction)createEmployee:(id)sender
120 {
121     NSWindow *w = [tableView window];
122     
123     BOOL editingEnded = [w makeFirstResponder:w];
124     if(!editingEnded)
125     {
126         NSLog(@"Unable to end editing");
127         return;
128     }
129     
130     NSUndoManager *undo = [self undoManager];
131     if ([undo groupingLevel])
132     {
133         [undo endUndoGrouping];
134         [undo beginUndoGrouping];
135     }
136     Person *p = [employeeController newObject];
137     [employeeController addObject:p];
138     [p release];
139     [employeeController rearrangeObjects];
140     
141     NSArray *a = [employeeController arrangedObjects];
142     int row = [a indexOfObjectIdenticalTo:p];
143     NSLog(@"starting edit of %@ in row %@", p, row);
144     [tableView editColumn:0 row:row withEvent:nil select:YES];
145 }
146
147 - (NSString *)windowNibName
148 {
149     // Override returning the nib file name of the document
150     // If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers, you should remove this method and override -makeWindowControllers instead.
151     return @"MyDocument";
152 }
153
154 - (void)windowControllerDidLoadNib:(NSWindowController *) aController
155 {
156     [super windowControllerDidLoadNib:aController];
157     NSUserDefaults *defautls = [NSUserDefaults standardUserDefaults];
158     NSData *colorAsData = [defautls objectForKey:BNRTableBgColorKey];
159     [tableView setBackgroundColor:[NSKeyedUnarchiver unarchiveObjectWithData:colorAsData]];
160     // Add any code here that needs to be executed once the windowController has loaded the document's window.
161 }
162
163 - (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
164 {
165     // Insert code here to write your document to data of the specified type. If the given outError != NULL, ensure that you set *outError when returning nil.
166
167     // You can also choose to override -fileWrapperOfType:error:, -writeToURL:ofType:error:, or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.
168
169     // For applications targeted for Panther or earlier systems, you should use the deprecated API -dataRepresentationOfType:. In this case you can also choose to override -fileWrapperRepresentationOfType: or -writeToFile:ofType: instead.
170
171     if ( outError != NULL ) {
172         *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
173     }
174     return nil;
175 }
176
177 - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError
178 {
179     // Insert code here to read your document from the given data of the specified type.  If the given outError != NULL, ensure that you set *outError when returning NO.
180
181     // You can also choose to override -readFromFileWrapper:ofType:error: or -readFromURL:ofType:error: instead.
182     
183     // For applications targeted for Panther or earlier systems, you should use the deprecated API -loadDataRepresentation:ofType. In this case you can also choose to override -readFromFile:ofType: or -loadFileWrapperRepresentation:ofType: instead.
184     
185     if ( outError != NULL ) {
186         *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
187     }
188     return YES;
189 }
190
191 @end