View Swapping(Chapter 29 of Cocoa Programming for Mac OS X)

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1 #import "MyDocument.h"
  2 #import "DepartmentViewController.h"
  3 #import "EmployeeViewController.h"
  4
  5 @implementation MyDocument
  6
  7 - (id)init
  8 {
  9     [super init];
10     viewControllers = [[NSMutableArray alloc] init];
11     
12     ManagingViewController *vc = [[DepartmentViewController alloc] init];
13     [vc setManagedObjectContext:[self managedObjectContext]];
14     [viewControllers addObject:vc];
15     [vc release];
16     
17     vc = [[EmployeeViewController alloc] init];
18     [vc setManagedObjectContext:[self managedObjectContext]];
19     [viewControllers addObject:vc];
20     [vc release];
21     
22     return self;
23 }
24
25 - (void)displayViewController:(ManagingViewController *)vc
26 {
27     NSWindow *w = [box window];
28     BOOL ended = [w makeFirstResponder:w];
29     if (!ended)
30     {
31         NSBeep();
32         return;
33     }
34     
35     NSView *v = [vc view];
36     
37     NSSize currentSize = [[box contentView] frame].size;
38     NSSize newSize = [v frame].size;
39     float deltaWidth = newSize.width - currentSize.width;
40     float deltaHeight = newSize.height - currentSize.height;
41     NSRect windowFrame = [w frame];
42     windowFrame.size.height += deltaHeight;
43     windowFrame.origin.y -= deltaHeight;
44     windowFrame.size.width += deltaWidth;
45     
46     [box setContentView:nil];
47     [w setFrame:windowFrame display:YES animate:YES];
48     
49     [box setContentView:v];
50 }
51
52 - (NSString *)windowNibName
53 {
54     // Override returning the nib file name of the document
55     // 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.
56     return @"MyDocument";
57 }
58
59 - (void)windowControllerDidLoadNib:(NSWindowController *)aController
60 {
61     [super windowControllerDidLoadNib:aController];
62     NSMenu *menu = [popUp menu];
63     int i, itemCount;
64     itemCount = [viewControllers count];
65     for(i=0; i<itemCount; i++)
66     {
67         NSViewController *vc = [viewControllers objectAtIndex:i];
68         NSMenuItem *mi = [[NSMenuItem alloc] initWithTitle:[vc title] action:@selector(changeViewController:) keyEquivalent:@""];
69         [mi setTag:i];
70         [menu addItem:mi];
71         [mi release];
72     }
73     
74     [self displayViewController:[viewControllers objectAtIndex:0]];
75     [popUp selectItemAtIndex:0];
76 }
77
78 - (IBAction)changeViewController:(id)sender
79 {
80     int i = [sender tag];
81     ManagingViewController *vc = [viewControllers objectAtIndex:i];
82     [self displayViewController:vc];
83 }
84
85 - (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
86     /*
87      Insert code here to write your document to data of the specified type. If outError != NULL, ensure that you create and set an appropriate error when returning nil.
88     You can also choose to override -fileWrapperOfType:error:, -writeToURL:ofType:error:, or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.
89     */
90     if (outError) {
91         *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
92     }
93     return nil;
94 }
95
96 - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError {
97     /*
98     Insert code here to read your document from the given data of the specified type. If outError != NULL, ensure that you create and set an appropriate error when returning NO.
99     You can also choose to override -readFromFileWrapper:ofType:error: or -readFromURL:ofType:error: instead.
100     */
101     if (outError) {
102         *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
103     }
104     return YES;
105 }
106
107 @end