OrderedTraversalPolicy class

A FocusTraversalPolicy that orders nodes by an explicit order that resides in the nearest FocusTraversalOrder widget ancestor.

Only orders of the same type are comparable. If a set of widgets in the same FocusTraversalGroup contains orders that are not comparable with each other, it will assert, since the ordering between such keys is undefined. To avoid collisions, use a FocusTraversalGroup to group similarly ordered widgets together.

When overriding, FocusOrder.doCompare must be overridden instead of FocusOrder.compareTo, which calls FocusOrder.doCompare to do the actual comparison.

See also:

• FocusTraversalGroup, a widget that groups together and imposes a traversal policy on the Focus nodes below it in the widget hierarchy.
• WidgetOrderTraversalPolicy, a policy that relies on the widget creation order to describe the order of traversal.
• ReadingOrderTraversalPolicy, a policy that describes the order as the natural "reading order" for the current Directionality.
• NumericFocusOrder, a focus order that assigns a numeric traversal order to a FocusTraversalOrder widget.
• LexicalFocusOrder, a focus order that assigns a string-based lexical traversal order to a FocusTraversalOrder widget.
• FocusOrder, an abstract base class for all types of focus traversal orderings.