Keyboard Events(Chapter 19 of Cocoa Programming for Mac OS X)

  1 #import "BigLetterView.h"
  2 
  3 
  4 @implementation BigLetterView
  5 
  6 - (id)initWithFrame:(NSRect)frameRect
  7 {
  8     if(![super initWithFrame:frameRect])
  9     {
 10         return nil;
 11     }
 12     
 13     NSLog(@"initializing view");
 14     bgColor = [[NSColor yellowColor] retain];
 15     string = @" ";
 16     return self;
 17 }
 18 
 19 - (void)dealloc
 20 {
 21     [bgColor release];
 22     [string release];
 23     [super dealloc];
 24 }
 25 
 26 - (void)drawRect:(NSRect)dirtyRect
 27 {
 28     NSRect bounds = [self bounds];
 29     [bgColor set];
 30     [NSBezierPath fillRect:bounds];
 31     
 32     if([[self window] firstResponder] == self)
 33     {
 34         [[NSColor keyboardFocusIndicatorColor] set];
 35         [NSBezierPath setDefaultLineWidth:4.0];
 36         [NSBezierPath strokeRect:bounds];
 37     }
 38 }
 39 
 40 - (BOOL)isOpaque
 41 {
 42     return YES;
 43 }
 44 
 45 - (BOOL)acceptsFirstResponder
 46 {
 47     NSLog(@"Accepting");
 48     return YES;
 49 }
 50 
 51 - (BOOL)resignFirstResponder
 52 {
 53     NSLog(@"Resigning");
 54     [self setNeedsDisplay:YES];
 55     return YES;
 56 }
 57 
 58 - (BOOL)becomeFirstResponder
 59 {
 60     NSLog(@"Becoming");
 61     [self setNeedsDisplay:YES];
 62     return YES;
 63 }
 64 
 65 - (void)keyDown:(NSEvent *)theEvent
 66 {
 67     [self interpretKeyEvents:[NSArray arrayWithObject:theEvent]];
 68 }
 69 
 70 - (void)insertText:(NSString *)input
 71 {
 72     [self setString:input];
 73 }
 74 
 75 - (void)insertTab:(id)sender
 76 {
 77     [[self window] selectKeyViewPrecedingView:self];
 78 }
 79 
 80 - (void)deleteBackward:(id)sender
 81 {
 82     [self setString:@" "];
 83 }
 84 
 85 #pragma mark Accessors
 86 
 87 - (void)setBgColor:(NSColor *)c
 88 {
 89     [c retain];
 90     [bgColor release];
 91     bgColor = c;
 92     [self setNeedsDisplay:YES];
 93 }
 94 
 95 - (NSColor *)bgColor
 96 {
 97     return bgColor;
 98 }
 99 
100 - (void)setString:(NSString *)c
101 {
102     c = [c copy];
103     [string release];
104     string = c;
105     NSLog(@"The string is now %@", string);
106 }
107 
108 - (NSString *)string
109 {
110     return string;
111 }
112 
113 @end