Package limn.accessibility

Interface Accessible.Argument

All Known Implementing Classes:

Accessible.Argument.None, Accessible.Argument.OfRange, Accessible.Argument.OfText, Accessible.Argument.OfValue

Enclosing class:

Accessible

public static sealed interface Accessible.Argument
permits Accessible.Argument.None, Accessible.Argument.OfValue, Accessible.Argument.OfText, Accessible.Argument.OfRange

What a parameterised Accessible.Action carries. A sealed value with no widget and no callback in it, because it crosses from a platform thread into a snapshot a reader may hold for minutes.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static final record	Accessible.Argument.None	The argument of a verb that takes nothing.
static final record	Accessible.Argument.OfRange	A range of text, for Accessible.Action.SET_CARET and Accessible.Action.SET_SELECTION.
static final record	Accessible.Argument.OfText	A string, for Accessible.Action.SET_TEXT.
static final record	Accessible.Argument.OfValue	A number, for Accessible.Action.SET_VALUE.

Field Summary

Fields

Modifier and Type	Field	Description
static final Accessible.Argument	NONE	The argument of every parameterless verb.

Method Summary

Static Methods

Modifier and Type	Method	Description
static double	finiteValueOf(Accessible.Argument arg)	The number a SET_VALUE carried, or NaN when the argument is not an Accessible.Argument.OfValue or its value is not finite.

Field Details

NONE

static final Accessible.Argument NONE

The argument of every parameterless verb.

Method Details

finiteValueOf

static double finiteValueOf(Accessible.Argument arg)

The number a SET_VALUE carried, or NaN when the argument is not an Accessible.Argument.OfValue or its value is not finite. One check for every widget with a value: a request that is not a finite number is refused before it reaches a clamp, because a clamp passes NaN straight through, and this is where every value verb makes that refusal rather than each spelling the two tests for itself.

Parameters:

arg - the verb's argument

Returns:

the finite value asked for, or NaN