| 1 | /* AccessibleValue.java -- aids in accessibly controlling values
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| 2 | Copyright (C) 2002 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GNU Classpath.
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| 5 |
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| 6 | GNU Classpath is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GNU Classpath is distributed in the hope that it will be useful, but
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| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GNU Classpath; see the file COPYING. If not, write to the
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| 18 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 19 | 02111-1307 USA.
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| 20 |
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| 21 | Linking this library statically or dynamically with other modules is
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| 22 | making a combined work based on this library. Thus, the terms and
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| 23 | conditions of the GNU General Public License cover the whole
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| 24 | combination.
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| 25 |
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| 26 | As a special exception, the copyright holders of this library give you
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| 27 | permission to link this library with independent modules to produce an
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| 28 | executable, regardless of the license terms of these independent
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| 29 | modules, and to copy and distribute the resulting executable under
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| 30 | terms of your choice, provided that you also meet, for each linked
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| 31 | independent module, the terms and conditions of the license of that
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| 32 | module. An independent module is a module which is not derived from
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| 33 | or based on this library. If you modify this library, you may extend
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| 34 | this exception to your version of the library, but you are not
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| 35 | obligated to do so. If you do not wish to do so, delete this
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| 36 | exception statement from your version. */
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| 37 |
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| 38 |
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| 39 | package javax.accessibility;
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| 40 |
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| 41 | /**
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| 42 | * If an object implements this interface then it must be able to control
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| 43 | * a numerical value. For example, a scroll bar has a position represented
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| 44 | * by a number. Accessibility software can use the implementations of this
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| 45 | * interface to change the associated value.
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| 46 | *
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| 47 | * <p>The <code>AccessibleContext.getAccessibleValue()</code> method should
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| 48 | * return <code>null</code> if an object does not implement this interface.
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| 49 | *
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| 50 | * @author Eric Blake <ebb9@email.byu.edu>
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| 51 | * @see Accessible
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| 52 | * @see AccessibleContext
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| 53 | * @see AccessibleContext#getAccessibleValue()
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| 54 | * @since 1.2
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| 55 | * @status updated to 1.4
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| 56 | */
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| 57 | public interface AccessibleValue
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| 58 | {
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| 59 | /**
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| 60 | * Gets the current value of this object, or null if it has not been set.
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| 61 | *
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| 62 | * @return the current value, or null
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| 63 | * @see #setCurrentAccessibleValue(Number)
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| 64 | */
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| 65 | Number getCurrentAccessibleValue();
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| 66 |
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| 67 | /**
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| 68 | * Sets the current value of this object. Returns true if the number
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| 69 | * successfully changed.
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| 70 | *
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| 71 | * @param number the new value
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| 72 | * @return true on success
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| 73 | */
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| 74 | // XXX What happens if number is null?
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| 75 | boolean setCurrentAccessibleValue(Number number);
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| 76 |
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| 77 | /**
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| 78 | * Gets the minimum value in the range of this object, or null if there is
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| 79 | * no minimum.
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| 80 | *
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| 81 | * @return the minimum
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| 82 | * @see #getMaximumAccessibleValue()
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| 83 | */
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| 84 | Number getMinimumAccessibleValue();
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| 85 |
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| 86 | /**
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| 87 | * Gets the maximum value in the range of this object, or null if there is
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| 88 | * no maximum.
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| 89 | *
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| 90 | * @return the maximum
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| 91 | * @see #getMinimumAccessibleValue()
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| 92 | */
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| 93 | Number getMaximumAccessibleValue();
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| 94 | } // interface AccessibleValue
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