Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Interface AccessibleValue - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.accessibility
Interface AccessibleValue

All Known Implementing Classes:: JSlider.AccessibleJSlider, JInternalFrame.AccessibleJInternalFrame, JInternalFrame.JDesktopIcon.AccessibleJDesktopIcon, JSplitPane.AccessibleJSplitPane, AbstractButton.AccessibleAbstractButton, JScrollBar.AccessibleJScrollBar, JProgressBar.AccessibleJProgressBar

public interface AccessibleValue

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.

See Also:: Accessible, Accessible.getAccessibleContext(), AccessibleContext, AccessibleContext.getAccessibleValue()

Method Summary

Number getCurrentAccessibleValue()
          Get the value of this object as a Number.

Number getMaximumAccessibleValue()
          Get the maximum value of this object as a Number.

Number getMinimumAccessibleValue()
          Get the minimum value of this object as a Number.

boolean setCurrentAccessibleValue(Number n)
          Set the value of this object as a Number.

Method Detail

getCurrentAccessibleValue

public Number getCurrentAccessibleValue()

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

Returns:: value of the object
See Also:: setCurrentAccessibleValue(java.lang.Number)

setCurrentAccessibleValue

public boolean setCurrentAccessibleValue(Number n)

Set the value of this object as a Number.

Returns:: True if the value was set; else False
See Also:: getCurrentAccessibleValue()

getMinimumAccessibleValue

public Number getMinimumAccessibleValue()

Get the minimum value of this object as a Number.

Returns:: Minimum value of the object; null if this object does not have a minimum value
See Also:: getMaximumAccessibleValue()

getMaximumAccessibleValue

public Number getMaximumAccessibleValue()

Get the maximum value of this object as a Number.

Returns:: Maximum value of the object; null if this object does not have a maximum value
See Also:: getMinimumAccessibleValue()