Make Your Application Accessible with Accerciser

Take your application out for spin with Accerciser, and see whether it's accessible.
Relationships

When sighted users see Limelite's UI, it is obvious to them what the relationship is between the labels. For example, it is clear that the Artist label denotes the fact that Edith Piaf is the performing artist of the current track. This is clear because of the table-like spatial layout of the labels: on the left are the field names and on the right are the field contents.

A screen reader will have trouble conveying this relationship between the two labels to blind users. AT-SPI exposes all of these labels as a flat collection, and GAIL has no way of automatically determining the labels' relationship to each other.

For this reason, such relationships need to be defined explicitly by the application author. If the application's UI was defined via Glade or GtkBuilder, we could easily declare the proper relationships in the Accessibility tab in each label's properties. If our user interface is written pragmatically, we will have to use ATK's API.

With Limelite as an example, the label containing the Artist string needs to have a “label-for” relationship with the label holding Edith Piaf, and the Edith Piaf label in turn needs to have a “labeled-by” relationship with the label holding Artist. Similar reciprocal relationships need to be defined for the Title and Album fields.

Figure 5. Label Relationships

Finally, in the Accessible section in Accerciser's Interface Viewer plugin, we could verify that the defined relationships are coming down the wire and are provided to the assistive technology.

Figure 6. Relations as Seen in Accerciser

Conclusion

It is hard to separate usability from accessibility; more often than not, the two terms are synonymous and require your sound judgment. But, if you keep a few simple principles in mind, developing an accessible application is an easy and straightforward task. Tools such as Accerciser allow you to review your program's interface from the assistive technology side and make informed choices in interface design.

Eitan Isaacson currently lives in Seattle, Washington. Eitan is a regular contributor to Orca and is the developer and maintainer of Accerciser. Eitan's passions include sipping high-mountain oolong tea and talking politics.

______________________

Webinar
One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Webinar
Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix