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

  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