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1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#import "config.h"
27#import "FullKeyboardAccessWatcher.h"
28
29NSString * const KeyboardUIModeDidChangeNotification = @"com.apple.KeyboardUIModeDidChange";
30const CFStringRef AppleKeyboardUIMode = CFSTR("AppleKeyboardUIMode");
31const CFStringRef UniversalAccessDomain = CFSTR("com.apple.universalaccess");
32
33@implementation FullKeyboardAccessWatcher
34
35- (void)retrieveKeyboardUIModeFromPreferences:(NSNotification *)notification
36{
37    CFPreferencesAppSynchronize(UniversalAccessDomain);
38
39    Boolean keyExistsAndHasValidFormat;
40    int mode = CFPreferencesGetAppIntegerValue(AppleKeyboardUIMode, UniversalAccessDomain, &keyExistsAndHasValidFormat);
41    if (keyExistsAndHasValidFormat) {
42        // The keyboard access mode is reported by two bits:
43        // Bit 0 is set if feature is on
44        // Bit 1 is set if full keyboard access works for any control, not just text boxes and lists.
45        fullKeyboardAccessEnabled = (mode & 0x2);
46    }
47}
48
49- (id)init
50{
51    self = [super init];
52    if (!self)
53        return nil;
54
55    [self retrieveKeyboardUIModeFromPreferences:nil];
56
57    [[NSDistributedNotificationCenter defaultCenter]
58        addObserver:self selector:@selector(retrieveKeyboardUIModeFromPreferences:)
59        name:KeyboardUIModeDidChangeNotification object:nil];
60
61    return self;
62}
63
64+ (BOOL)fullKeyboardAccessEnabled
65{
66    static FullKeyboardAccessWatcher *watcher = [[FullKeyboardAccessWatcher alloc] init];
67    return watcher->fullKeyboardAccessEnabled;
68}
69
70@end
71