Home | History | Annotate | Download | only in mac 
      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 
     29 NSString * const KeyboardUIModeDidChangeNotification = @"com.apple.KeyboardUIModeDidChange";
     30 const CFStringRef AppleKeyboardUIMode = CFSTR("AppleKeyboardUIMode");
     31 const 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