Shaun McCance
shaunm@gnome.org 2011–2012
Accessibility toolkit to implement support for screen readers and other tools
Fran Diéguez
frandieguez@gnome.org 2009-2020.
Leandro Regueiro
leandro.regueiro@gmail.com 2011.

# ATK

A accesibilidade é o proceso de asegurarse de que a súa aplicación pode ser usada por persoas con algunha ou varias discapacidades. As discapacidades poden ser de moitos tipos: visuais, de coordinación, movementos descoordinados, impedimentos auditivos, impedimentos cognitivos e de idioma e desorde de apoplexías. Moitas persoas teñen algún tipo de discapacidade e facer o seu aplicación accesíbel permitira que máis xente poida usalo de forma efectiva.

GNOME provides support for accessibility devices using the ATK framework, which stands for Accessibility Tool Kit. This framework defines a set of interfaces to which graphical interface components adhere. This allows, for instance, screen readers to read the text of an interface and interact with its controls. ATK support is built into GTK and the rest of the GNOME platform, so any application using GTK will have reasonable accessibility support for free.

ATK solves the problem of plugging many different kinds of widgets (text entries, text areas, buttons, menus) with many different types of accessibility technologies (screen readers, braille displays, sip-and-puff control devices). Instead of writing N×M interfaces, from each widget to each accessibility device, one just has to expose a widget through ATK's interfaces. Accessibility devices will in turn use these interfaces to query accessible widgets. For example, an aural screen reader and a braille display will both use a standard "get the text contents" interface in ATK for all widgets with textual information.

Nonetheless, you should be aware of accessibility issues when developing your applications. Although GTK interfaces provide reasonable accessibility by default, you can often improve how well your program behaves with accessibility tools by providing additional information to ATK. If you develop custom widgets, you should ensure that they expose their properties to ATK. You should also avoid using sound, graphics, or color as the sole means of conveying information to the user; have redundant ways of providing this information instead of relying on the user being able to perceive a particular medium.

O escritorio GNOME posee certo número de ferramentas de accesibilidade que lle permite aos usuarios con discapacidades usar plenamente o escritorio e as súas aplicacións. Os aplicacións que implementan completamente ATK serán capaces de traballar coas ferramentas de accesibilidade. As ferramentas de accesibilidade de GNOME inclúen un lector de pantalla, un magnificador de pantalla, un teclado en pantalla e Dasher, unha innovadora ferramenta de predición de entrada de texto.

Accesibilidade de GNOME para os desenvolvedores

ATK Reference