1、 Reference number ISO/IEC 24786:2009(E) ISO/IEC 2009INTERNATIONAL STANDARD ISO/IEC 24786 First edition 2009-12-15 Information technology User interfaces Accessible user interface for accessibility settings Technologies de linformation Interfaces utilisateurs Interface utilisateur accessible pour le
2、paramtrage de laccessibilit ISO/IEC 24786:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer
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7、servedISO/IEC 24786:2009(E) ISO/IEC 2009 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Conformance .1 3 Normative references1 4 Terms and definitions .1 5 Requirements and recommendations .4 5.1 Accessibility setting mode .4 5.1.1 Accessibility setting mode before login
8、.4 5.1.2 Contents and interface of the accessibility setting mode.5 5.1.3 Access procedure .5 5.2 Items of accessibility setting .6 5.2.1 StickyKeys6 5.2.2 SlowKeys 8 5.2.3 BounceKeys .9 5.2.4 FilterKeys10 5.2.5 MouseKeys .10 5.2.6 RepeatKeys 13 5.2.7 ToggleKeys.13 5.2.8 SoundSentry.13 5.2.9 ShowSou
9、nds 14 5.2.10 Time Out .14 5.2.11 On-screen keyboard15 5.2.12 Voice operation15 5.2.13 Visual emphasis 15 5.2.14 Screen reader.16 5.2.15 Auditory feedback .16 5.2.16 Visual feedback .17 5.3 Shortcuts to access the accessibility features 17 ISO/IEC 24786:2009(E) iv ISO/IEC 2009 All rights reservedFor
10、eword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical
11、 committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in
12、 the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare Internati
13、onal Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of t
14、he elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 24786 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 35, User interfaces. ISO/IEC 24786
15、:2009(E) ISO/IEC 2009 All rights reserved vIntroduction People with disabilities (e.g. visual, hearing, physical) can experience difficulties in accessing computers and other information/communication technology (ICT) devices. Accessible user interfaces, as described in this International Standard,
16、can help them to operate computers. In order to effectively operate accessible user interfaces, users need to be able to adjust accessibility settings prior to use. If this is not possible, some people will not be able to access these devices without help from another party. This International Stand
17、ard will make the information technologies more accessible by ensuring that people with disabilities can adjust accessibility settings by themselves. INTERNATIONAL STANDARD ISO/IEC 24786:2009(E) ISO/IEC 2009 All rights reserved 1Information technology User interfaces Accessible user interface for ac
18、cessibility settings 1 Scope This International Standard specifies requirements and recommendations for making accessibility settings accessible. It provides guidance on specific accessibility settings. It specifies how to access and operate the accessibility setting mode, and how to directly activa
19、te specific accessibility features. This International Standard applies to all operating system user interfaces on computers, but can also be applied to other types of information/communication technology, where appropriate. This International Standard does not apply to the user interface before the
20、 operating system is loaded and active. 2 Conformance The computer is conformant to ISO/IEC 24786 Level 1 if it meets all requirements of Clause 5, but does not meet all recommendations of Clause 5. The computer is conformant to ISO/IEC 24786 Level 2 if it meets all requirements and recommendations
21、of Clause 5. 3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 2382-
22、1:1993, Information technology Vocabulary Part 1: Fundamental terms ISO 9241-171:2008, Ergonomics of human-system interaction Part 171: Guidance on software accessibility 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE The terms StickyKeys,
23、SlowKeys, BounceKeys, FilterKeys, MouseKeys, RepeatKeys, ToggleKeys, SoundSentry, and ShowSounds are all trademarks of the University of Wisconsin. However, use of the terms is permitted freely, without royalty or license, to describe user interface features that have the functionality and behaviour
24、 described in this International Standard. 4.1 accessibility feature feature (etc.) that is specifically designed to increase the usability of products for those experiencing disabilities ISO 9241-171:2008 ISO/IEC 24786:2009(E) 2 ISO/IEC 2009 All rights reserved4.2 accessibility setting setting to m
25、ake the user interface more accessible for people with disabilities EXAMPLE A setting is provided to turn large text or screen magnification ON for people with low vision. 4.3 accessibility setting mode mode where the user adjusts accessibility settings NOTE A user can access almost all the accessib
26、ility settings and adjustments for the accessibility features through this mode. 4.4 auditory feedback function that allows individuals to hear whether their operations (e.g. key input) have been accepted by the computer NOTE Auditory feedback includes beep sound with key input, alarm sound, etc. 4.
27、5 BounceKeys function that only accepts a single keystroke at a time from a key NOTE BounceKeys is designed for users with tremor that causes them to inadvertently strike a key extra times when pressing or releasing the key. Once a key is released it will not accept another stroke of the same key un
28、til a (user-settable) period of time has passed. BounceKeys has no effect on how quickly a person can type a different key. ISO 9241-171:2008, Annex E 4.6 computer functional unit that can perform substantial computations, including numerous arithmetic operations and logic operations, without human
29、intervention ISO/IEC 2382-1:1993, 01.03.03 4.7 FilterKeys BounceKeys and SlowKeys features combined as a package NOTE The term FilterKeys is sometimes used for the BounceKeys and SlowKeys features packaged together. It is acceptable to make these two features mutually exclusive. However, they can al
30、so both be active at the same time (though SlowKeys will dominate). ISO 9241-171:2008, Annex E 4.8 MouseKeys function that allows the user to use the keys on the numeric keypad to control the mouse cursor on screen and to operate the mouse buttons NOTE MouseKeys is designed for users who are physica
31、lly unable to use a mouse accurately (or at all). ISO 9241-171:2008, Annex E 4.9 on-screen keyboard software that presents a keyboard on the display screen that is operable by a pointing device and that generates input that is identical to that which comes from a physical keyboard NOTE In ISO 9241-1
32、71:2008, 3.19, on-screen keyboard is given as an example of a keyboard emulator. ISO/IEC 24786:2009(E) ISO/IEC 2009 All rights reserved 34.10 RepeatKeys facility to control auto-repeat, repeat onset and repeat rate of keys NOTE 1 RepeatKeys is designed to allow use of computers by people who cannot
33、move quickly enough when pressing keys to keep them from auto-repeating. The facilities to adjust repeat onset, repeat rate and to turn auto-repeat off are usually included as part of most keyboard system settings. If these functions are not included, RepeatKeys provides them. RepeatKeys also ensure
34、s that the repeat delay and repeat interval can be set long enough for users who do not have quick response (if the standard maximum value for either of the regular key repeat settings is not long enough). ISO 9241-171:2008, Annex E NOTE 2 The system settings is a panel or window where the user adju
35、sts OS settings. The name of the system settings differs depending on the OS. Common names for this function include control panel and system preferences. 4.11 screen reader function that reads the characters and other information on the screen aloud to the user to allow access to the information on
36、 screen without viewing the screen 4.12 shortcut operation which immediately invokes an action without displaying intermediate information (such as menus) or requiring pointer movement or any other user activity 4.13 ShowSounds user-configurable system flag that is readable by application software a
37、nd is intended to inform ShowSounds-aware applications that all information conveyed audibly should also be conveyed visually NOTE ShowSounds is a feature for users who cannot clearly hear speech or cannot distinguish between sounds from a computer due to hearing impairment, a noisy environment, or
38、an environment where sound is not allowed, such as a library or classroom. For example, captions can be shown for recorded or synthesized speech, and a message or icon can be displayed when a sound is used to indicate that new mail has arrived. However, captions cannot be provided for speech output
39、where the speech is reading information that is already visually presented on the screen (e.g. screen readers). ISO 9241-171:2008, Annex E 4.14 SlowKeys function that causes the keyboard to ignore all keys that are bumped or pressed briefly NOTE SlowKeys is designed for users who have extra, uncontr
40、olled movements that cause them to strike surrounding keys unintentionally when typing. Keystrokes are accepted only if keys are held down for a user-specifiable period of time. ISO 9241-171:2008, Annex E 4.15 SoundSentry feature providing a visual signal to indicate when the computer is generating
41、a sound EXAMPLE screen flash, caption bar flash. NOTE SoundSentry is a feature for individuals who cannot hear system sounds (due to hearing impairment, a noisy environment, or an environment where sound is not allowed, such as a library or classroom). SoundSentry works by monitoring the system soun
42、d hardware and providing a user-selectable indication whenever sound activity is detected. Note that this feature cannot usually discriminate between different sounds, identify the sources of sounds, or provide a useful alternative for speech output or information encoded in sounds. Applications can
43、 support the ShowSounds feature to provide the user with a useful alternative to information conveyed using sound. SoundSentry is just a system-level fallback for applications that do not support ShowSounds. ISO 9241-171:2008, Annex E 4.16 StickyKeys function that allows users to press key combinati
44、ons (e.g. Ctrl-Alt-Delete) sequentially rather than having to hold them all down together ISO/IEC 24786:2009(E) 4 ISO/IEC 2009 All rights reservedNOTE StickyKeys is designed for people who cannot use both hands, or who use a dowel or stick to type. StickyKeys works with those keys defined as “modifi
45、er” keys, such as the Shift, Alt and Ctrl keys. Usually the StickyKeys status is shown on-screen at the users option. ISO 9241-171:2008, Annex E 4.17 Time Out feature that turns the accessibility features off automatically after an adjustable time when no keyboard or mouse activity occurs NOTE Time
46、Out is intended to be used on public or shared computers, such as those in libraries, bookstores, etc., where a user might leave the computer with an access feature turned on, thus potentially confusing the next user or leading people to think the computer was broken. ISO 9241-171:2008, Annex E 4.18
47、 ToggleKeys feature alerting the user when a toggle key has been locked or unlocked NOTE ToggleKeys is a feature for users who cannot see the visual keyboard status indicators for locking (toggle) keys such as CapsLock, ScrollLock, NumLock, etc. ToggleKeys provides an auditory signal, such as a high
48、 beep, to alert the user that a toggle key such as the CapsLock has been locked, and a separate signal, such as a low beep, to alert the user that a toggle key has been unlocked. ISO 9241-171:2008, Annex E 4.19 visual emphasis function that allows users to change the visual aspects to improve visibi
49、lity NOTE Visual emphasis includes adjustment of character size, screen magnification, contrast, luminance, color balance, color tone inverse, gradation, etc. 4.20 visual feedback function that allows users to know visually whether their operations (e.g. key input) have been accepted by the computer NOTE Visual feedback includes the key indicators when StickyKeys is enabled, visual indication when an on-screen key is pressed, etc. 4.21 voice operation fun
