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