Sheets(Chapter 25 of Cocoa Programming for Mac OS X)

时间：2011-03-08 来源：Ray Z

  1 //
  2 //  AppController.m
  3 //  TypingTutor
  4 //
  5 //  Created by b1mobile on 3/3/11.
  6 //  Copyright 2011 __MyCompanyName__. All rights reserved.
  7 //
  8
  9 #import "AppController.h"
10 #import "BigLetterView.h"
11
12 #define MAX_COUNT (100)
13 //#define COUNT_STEP (5)
14
15 @implementation AppController
16
17 - (id)init
18 {
19     [super init];
20
21     letters = [[NSArray alloc] initWithObjects:@"a", @"s", @"d", @"f", @"j", @"k", @"l", @";", nil];
22     srandom(time(NULL));
23     stepSize = 5;
24     return self;
25 }
26
27 - (void)awakeFromNib
28 {
29     [self showAnotherLetter];
30 }
31
32 - (void)resetCount
33 {
34     [self willChangeValueForKey:@"count"];
35     count = 0;
36     [self didChangeValueForKey:@"count"];
37 }
38
39 - (void)incrementCount
40 {
41     [self willChangeValueForKey:@"count"];
42     count = count + stepSize;
43     if (count > MAX_COUNT)
44     {
45         count = MAX_COUNT;
46     }
47     [self didChangeValueForKey:@"count"];
48 }
49
50 - (void)showAnotherLetter
51 {
52     int x = lastIndex;
53     while (x == lastIndex)
54     {
55         x = random() % [letters count];
56     }
57     lastIndex = x;
58     [outLetterView setString:[letters objectAtIndex:x]];
59
60     [self resetCount];
61 }
62
63 - (IBAction)stopGo:(id)sender
64 {
65     if (timer == nil)
66     {
67         NSLog(@"Starting");
68
69         timer = [[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(checkThem) userInfo:nil repeats:YES] retain];
70     }
71     else
72     {
73         NSLog(@"Stopping");
74         [timer invalidate];
75         [timer release];
76         timer = nil;
77     }
78 }
79
80 - (void)checkThem:(NSTimer *)aTimer
81 {
82     if([[inLetterView string] isEqual:[outLetterView string]])
83     {
84         [self showAnotherLetter];
85     }
86     if (count == MAX_COUNT)
87     {
88         NSBeep();
89         [self resetCount];
90     }
91     else
92     {
93         [self incrementCount];
94     }
95 }
96
97 - (IBAction)showSpeedSheet:(id)sender
98 {
99     [NSApp beginSheet:speedSheet modalForWindow:[inLetterView window] modalDelegate:nil didEndSelector:NULL contextInfo:NULL];
100 }
101
102 - (IBAction)endSpeedSheet:(id)sender
103 {
104     [NSApp endSheet:speedSheet];
105     [speedSheet orderOut:sender];
106 }
107
108 @end

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