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95 lines
3.3 KiB
Java
95 lines
3.3 KiB
Java
/* AccessibleValue.java -- aids in accessibly controlling values
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.accessibility;
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/**
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* If an object implements this interface then it must be able to control
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* a numerical value. For example, a scroll bar has a position represented
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* by a number. Accessibility software can use the implementations of this
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* interface to change the associated value.
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*
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* <p>The <code>AccessibleContext.getAccessibleValue()</code> method should
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* return <code>null</code> if an object does not implement this interface.
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*
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* @author Eric Blake <ebb9@email.byu.edu>
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* @see Accessible
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* @see AccessibleContext
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* @see AccessibleContext#getAccessibleValue()
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* @since 1.2
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* @status updated to 1.4
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*/
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public interface AccessibleValue
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{
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/**
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* Gets the current value of this object, or null if it has not been set.
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*
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* @return the current value, or null
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* @see #setCurrentAccessibleValue(Number)
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*/
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Number getCurrentAccessibleValue();
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/**
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* Sets the current value of this object. Returns true if the number
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* successfully changed.
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*
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* @param number the new value
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* @return true on success
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*/
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// XXX What happens if number is null?
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boolean setCurrentAccessibleValue(Number number);
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/**
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* Gets the minimum value in the range of this object, or null if there is
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* no minimum.
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*
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* @return the minimum
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* @see #getMaximumAccessibleValue()
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*/
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Number getMinimumAccessibleValue();
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/**
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* Gets the maximum value in the range of this object, or null if there is
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* no maximum.
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*
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* @return the maximum
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* @see #getMinimumAccessibleValue()
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*/
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Number getMaximumAccessibleValue();
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} // interface AccessibleValue
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