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

shangban

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