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package javax.accessibility;


The AccessibleValue interface should be supported by any object that supports a numerical value (e.g., a scroll bar). This interface provides the standard mechanism for an assistive technology to determine and set the numerical value as well as get the minimum and maximum values. Applications can determine if an object supports the AccessibleValue interface by first obtaining its AccessibleContext (see Accessible) and then calling the AccessibleContext.getAccessibleValue method. If the return value is not null, the object supports this interface. 
Author:     Peter Korn,      Hans Muller,      Willie Walker
See Also:
/**
 * The AccessibleValue interface should be supported by any object
 * that supports a numerical value (e.g., a scroll bar).  This interface
 * provides the standard mechanism for an assistive technology to determine
 * and set the numerical value as well as get the minimum and maximum values.
 * Applications can determine
 * if an object supports the AccessibleValue interface by first
 * obtaining its AccessibleContext (see
 * {@link Accessible}) and then calling the
 * {@link AccessibleContext#getAccessibleValue} method.
 * If the return value is not null, the object supports this interface.
 *
 * @see Accessible
 * @see Accessible#getAccessibleContext
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleValue
 *
 * @author      Peter Korn
 * @author      Hans Muller
 * @author      Willie Walker
 */
public interface AccessibleValue {

    
Get the value of this object as a Number.  If the value has not been
set, the return value will be null.

See Also:
Returns:value of the object
/**
     * Get the value of this object as a Number.  If the value has not been
     * set, the return value will be null.
     *
     * @return value of the object
     * @see #setCurrentAccessibleValue
     */
    public Number getCurrentAccessibleValue();

    
Set the value of this object as a Number.

Params:
  • n – the number to use for the value
See Also:
Returns:True if the value was set; else False
/**
     * Set the value of this object as a Number.
     *
     * @param n the number to use for the value
     * @return True if the value was set; else False
     * @see #getCurrentAccessibleValue
     */
    public boolean setCurrentAccessibleValue(Number n);

//    /**
//     * Get the description of the value of this object.
//     *
//     * @return description of the value of the object
//     */
//    public String getAccessibleValueDescription();

    
Get the minimum value of this object as a Number.

See Also:
Returns:Minimum value of the object; null if this object does not
have a minimum value
/**
     * Get the minimum value of this object as a Number.
     *
     * @return Minimum value of the object; null if this object does not
     * have a minimum value
     * @see #getMaximumAccessibleValue
     */
    public Number getMinimumAccessibleValue();

    
Get the maximum value of this object as a Number.

See Also:
Returns:Maximum value of the object; null if this object does not
have a maximum value
/**
     * Get the maximum value of this object as a Number.
     *
     * @return Maximum value of the object; null if this object does not
     * have a maximum value
     * @see #getMinimumAccessibleValue
     */
    public Number getMaximumAccessibleValue();
}