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#if PLATFORM(MAC)
30
31#import "WebContext.h"
32
33NSString * const KeyboardUIModeDidChangeNotification = @"com.apple.KeyboardUIModeDidChange";
34const CFStringRef AppleKeyboardUIMode = CFSTR("AppleKeyboardUIMode");
35
36using namespace WebKit;
37
38@implementation WKFullKeyboardAccessWatcher
39
40- (void)notifyAllWebContexts
41{
42    const Vector<WebContext*>& contexts = WebContext::allContexts();
43    for (size_t i = 0; i < contexts.size(); ++i)
44        contexts[i]->fullKeyboardAccessModeChanged(fullKeyboardAccessEnabled);
45}
46
47- (void)retrieveKeyboardUIModeFromPreferences:(NSNotification *)notification
48{
49    BOOL oldValue = fullKeyboardAccessEnabled;
50
51    CFPreferencesAppSynchronize(kCFPreferencesCurrentApplication);
52
53    Boolean keyExistsAndHasValidFormat;
54    int mode = CFPreferencesGetAppIntegerValue(AppleKeyboardUIMode, kCFPreferencesCurrentApplication, &keyExistsAndHasValidFormat);
55    if (keyExistsAndHasValidFormat) {
56        // The keyboard access mode has two bits:
57        // Bit 0 is set if user can set the focus to menus, the dock, and various windows using the keyboard.
58        // Bit 1 is set if controls other than text fields are included in the tab order (WebKit also always includes lists).
59        fullKeyboardAccessEnabled = (mode & 0x2);
60    }
61
62    if (fullKeyboardAccessEnabled != oldValue)
63        [self notifyAllWebContexts];
64}
65
66- (id)init
67{
68    self = [super init];
69    if (!self)
70        return nil;
71
72    [self retrieveKeyboardUIModeFromPreferences:nil];
73
74    [[NSDistributedNotificationCenter defaultCenter]
75        addObserver:self selector:@selector(retrieveKeyboardUIModeFromPreferences:)
76        name:KeyboardUIModeDidChangeNotification object:nil];
77
78    return self;
79}
80
81+ (BOOL)fullKeyboardAccessEnabled
82{
83    static WKFullKeyboardAccessWatcher *watcher = [[WKFullKeyboardAccessWatcher alloc] init];
84    return watcher->fullKeyboardAccessEnabled;
85}
86
87@end
88
89#endif // PLATFORM(MAC)
90