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docs: Add a note on the "presentation" role

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Emmanuele Bassi 2020-11-05 14:50:40 +00:00
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docs/reference/gtk/section-accessibility.md
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@ -292,6 +292,20 @@ The power of hiding and enhancing can be a double-edged sword, as it can
lead to inadvertently overriding the accessible semantics of existing lead to inadvertently overriding the accessible semantics of existing
widgets. widgets.
## Hiding UI elements from the accessible tree
The accessibility API is mainly used to express semantics useful for
assistive technologies, but it can also be used to hide elements. The
canonical way to do so is to use the %GTK_ACCESSIBLE_ROLE_PRESENTATION,
which declares that a UI element is purely meant for presentation purposes,
and as such it has no meaningful impact on the accessibility of the
interface.
A "presentation" role should not be confused with the
%GTK_ACCESSIBLE_STATE_HIDDEN state; the "hidden" state is transient, and is
typically controlled by showing and hiding a widget using the #GtkWidget
API.
## Design patterns and custom widgets ## Design patterns and custom widgets
When creating custom widgets, following established patterns can help When creating custom widgets, following established patterns can help