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 "WKFullKeyboardAccessWatcher.h"
28
29#import "WebContext.h"
30
31NSString * const KeyboardUIModeDidChangeNotification = @"com.apple.KeyboardUIModeDidChange";
32const CFStringRef AppleKeyboardUIMode = CFSTR("AppleKeyboardUIMode");
33const CFStringRef UniversalAccessDomain = CFSTR("com.apple.universalaccess");
34
35using namespace WebKit;
36
37@implementation WKFullKeyboardAccessWatcher
38
39- (void)notifyAllWebContexts
40{
41    const Vector<WebContext*>& contexts = WebContext::allContexts();
42    for (size_t i = 0; i < contexts.size(); ++i)
43        contexts[i]->fullKeyboardAccessModeChanged(fullKeyboardAccessEnabled);
44}
45
46- (void)retrieveKeyboardUIModeFromPreferences:(NSNotification *)notification
47{
48    BOOL oldValue = fullKeyboardAccessEnabled;
49
50    CFPreferencesAppSynchronize(UniversalAccessDomain);
51
52    Boolean keyExistsAndHasValidFormat;
53    int mode = CFPreferencesGetAppIntegerValue(AppleKeyboardUIMode, UniversalAccessDomain, &keyExistsAndHasValidFormat);
54    if (keyExistsAndHasValidFormat) {
55        // The keyboard access mode is reported by two bits:
56        // Bit 0 is set if feature is on
57        // Bit 1 is set if full keyboard access works for any control, not just text boxes and lists.
58        fullKeyboardAccessEnabled = (mode & 0x2);
59    }
60
61    if (fullKeyboardAccessEnabled != oldValue)
62        [self notifyAllWebContexts];
63}
64
65- (id)init
66{
67    self = [super init];
68    if (!self)
69        return nil;
70
71    [self retrieveKeyboardUIModeFromPreferences:nil];
72
73    [[NSDistributedNotificationCenter defaultCenter]
74        addObserver:self selector:@selector(retrieveKeyboardUIModeFromPreferences:)
75        name:KeyboardUIModeDidChangeNotification object:nil];
76
77    return self;
78}
79
80+ (BOOL)fullKeyboardAccessEnabled
81{
82    static WKFullKeyboardAccessWatcher *watcher = [[WKFullKeyboardAccessWatcher alloc] init];
83    return watcher->fullKeyboardAccessEnabled;
84}
85
86@end
87