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GNOME Desktop Accessibility Development & Testing Sun Microsystems, Inc. Aug 2010.

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Presentation on theme: "GNOME Desktop Accessibility Development & Testing Sun Microsystems, Inc. Aug 2010."— Presentation transcript:

1 GNOME Desktop Accessibility Development & Testing Sun Microsystems, Inc. Aug 2010

2 Topics What is accessibility? Introduction to accessibility infrastructure Current focus on accessibility development How to test accessibility? What are we testing on GNOME Desktop? What can accessibility do for other testing? How can I participate? Comments and thoughts?

3 What is Accessibility Accessibility is a technology enables individuals to make full use of computer-based technology despite variability in physical or sensory abilities due to illness, aging or disability. The Accessibility Infrastructure gathers useful information about programs running on the desktop and provides this information to Assistive Technologies (ATs) which interact with end users.

4 What is Accessibility Accessibility Infrastructure is useful for other purposes as well: > Automatic Testing Tools: LDTP, Dogtail, Strongwind > Alternative input/output devices The GNOME Accessibility Infrastructure is based on the interfaces designed by Sun for Java Accessibility, and has been primarily driven and designed by Sun engineers.

5 What is Accessibility Orca GOK Assistive Technology Application

6 Applications and ATs communicate via a layered architecture Application changes trigger events which are dispatched through the layers. ATs may make AT-SPI calls which are based on the application’s data, GUI, and/or internal state. ATs “know about” the application by receiving events and issuing queries and requests. Application AT-SPI Layer AT Bridge API calls EVENTS

7 Accessibility Infrastructure: Multiple ATK Impl. Query the current user context Obtain app content Spea k text Move mag region Braille I/O Text to Speech driver BrlTTY driver Magnifier Service Interact with UI AT AT SERVICES AT Mozilla (Gecko) GNOME apps (GTK+) OpenOffice.org ATK atk-bridge Java ATK WrapperUAA Application events AT-SPI Apps Accessibility GeckoGAIL Java apps......

8 How GTK+/GNOME Apps connect to AT-SPI GNOME applications implement an in-process accessibility API called ATK, which is ‘bridged’ to the common AT-SPI layer by the ATK-bridge module. GAIL hooks into ATK and implements ATK interfaces on behalf of GTK+. GAIL is dynamically loaded via glib’s GModule API. GTK+/GNOME Application ATK Bridge (libatk-bridge) ATK GTK+ APP AT-SPI AT Bridge GAIL

9 Process space diagram AT gets app handles from registry, and registers for event notifications. Other AT communications go direct to the application’s bridge code. Application Bridge at-spi-registryd AT-SPI calls ListappsListapps Register AppRegister App ATK GTK+ AT

10 Current Focus Starting with GNOME 3.0, the usage of CORBA (Bonobo,ORBit2) by the GNOME accessibility infrastructure will be deprecated. D-Bus will become the default IPC mechanism. This make it possible for the KDE and Qt community to start taking advantage of the accessibility infrastructure. Sun engineers are working on re-write of the infrastructure to use D-Bus instead of CORBA.

11 Infrastructure: CORBA GTK+ GAIL ATK atk-bridge Mozilla nsAccessible ATK atk-bridge OOo UNO ATK atk-bridge Java JAAPI JABG at-spi-registryd pyatspi cspi gnome-session OrcaGOK CORBA

12 Infrastructure: D-Bus GTK+ GAIL ATK atk-adaptor Mozilla nsAccessible ATK atk-adaptor OOo UNO ATK atk-adaptor Java JAAPI ATK atk-adaptor at-spi2-registryd pyatspi2 cspi2 D-Bus Activation OrcaGOK D-Bus JAW

13 Java Apps use atk-bridge through wrapper Swing defines a Java-specific accessibility API in javax.accessibility. The Java ATK Wrapper is an implementation of ATK by using JNI technology. It converts Java Swing events into ATK events. Java ATK Wrapper replaces the former Java Access Bridge which sends events to AT-SPI layer directly. Firefox and OpenOffice also use atk-bridge. Java/Swing Application Java ATK Wrapper for GNOME javax.accessibility Swing APP AT-SPI AT Bridge ATK Bridge (libatk-bridge)

14 The new architecture All IPCs are based on D-Bus. New modules: at-spi2-core (including at-spi2-registryd), at-spi2-atk (including atk-adaptor), pyatspi2. Application ATK-adaptor at-spi2-registryd AT-SPI2 calls ListappsListapps Register AppRegister App ATK GTK+ AT AT-SPI2 events

15 How to test accessibility Make sure your accessibility switch turned on

16 How to test accessibility Make sure your accessibility switch turned on

17 How to test accessibility Accerciser - useful At-tool for testing & debugging

18 How to test accessibility First thing to making an accessible app > Your app should be “visible” to accerciser

19 How to test accessibility First thing to making an accessible app > Each widget can be tracked down in accerciser

20 How to test accessibility First thing to making an accessible app > Check widget's accessibility status, relations, descriptions and attributes

21 How to test accessibility First thing to making an accessible app > Action can be performed on widget

22 What are we testing on GNOME Desktop AccessX > Stick Keys > Repeat Keys

23 What are we testing on GNOME Desktop AccessX > Slow Keys > Bounce Keys

24 What are we testing on GNOME Desktop AccessX > Mouse Keys

25 What are we testing on GNOME Desktop Orca Screen Reader

26 What are we testing on GNOME Desktop Orca Screen Reader

27 What are we testing on GNOME Desktop Orca Screen Magnifier

28 What are we testing on GNOME Desktop GNOME On-screen Keyboard > Switch device > Pointing device > Dwell device

29 What are we testing on GNOME Desktop GNOME Accessibility Themes > HighContrastLargePrintInverse Theme

30 What are we testing on GNOME Desktop Assess project accessibility status Submit 508 Assessment for desktop projects Over 20 projects meet the U.S. Gov 508 requirements, which include all kinds of desktop project, like browser, mail client, file manager and etc.

31 What can accessibility do for other testing Automated functional testing Accessibility testing Automation testing tools: > Dogtail > Orca > LDTP > Strongwind

32 What can accessibility do for other testing Automated functional testing > There are a series of automated testing running on OpenSolaris desktop nightly build testing machines, cases are created for Dogtail test framework > We also have more than 20 test cases for accessibility regression testing, cases are created for orca harness test framework

33 What can accessibility do for other testing Automated functional testing > GNOME Desktop Testing Project > Mago/LDTP automation testing framework > 18 automation test cases created, more than 50 applications can be covered by automation testing > Open community for developer, QA and contributors > OpenSolaris branch is under developing and ready for everyone

34 How can I participate To join discuss on GNOME > Subscribe to: Gnome-accessibility-list-request@gnome.orgGnome-accessibility-list-request@gnome.org > Irc channel: > irc.gnome.org > #a11y To join discuss on OpenSolaris > Subscribe to: > desktop-testing@opensolaris.org desktop-testing@opensolaris.org

35 How can I participate GNOME community > http://www.gnome.org/ http://www.gnome.org/ > http://bugzilla.gnome.org/ http://bugzilla.gnome.org/ > http://live.gnome.org/DesktopTesting http://live.gnome.org/DesktopTesting OpenSolaris community > http://www.opensolaris.org/ http://www.opensolaris.org/ > http://defect.opensolaris.org/ http://defect.opensolaris.org/

36 Comments and thoughts > Q & A

37 Thanks!

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