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590 lines
17 KiB
Java
590 lines
17 KiB
Java
/* AccessibleContext.java -- the context of an accessible object
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Copyright (C) 2002 Free Software Foundation
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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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import java.beans.PropertyChangeListener;
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import java.beans.PropertyChangeSupport;
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import java.util.Locale;
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/**
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* The minimum information that all accessible objects return. This includes
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* name, description, role, and state of the object, parents and children,
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* and any other useful information. If a component supports further details,
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* it should implement one of the following:<ul>
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* <li>{@link AccessibleAction} - the object can perform actions</li>
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* <li>{@link AccessibleComponent} - the object has a graphical
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* representation</li>
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* <li>{@link AccessibleSelection} - the object allows its children to be
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* selected</li>
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* <li>{@link AccessibleText} - the object represents editable text</li>
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* <li>{@link AccessibleValue} - the object represents a numerical value</li>
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* </ul>
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*
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* @author Eric Blake <ebb9@email.byu.edu>
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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 abstract class AccessibleContext
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{
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/**
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* Constant used when the accessible name has changed. Both the old and new
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* values are listed in the event.
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*
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* @see #getAccessibleName()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_NAME_PROPERTY
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= "AccessibleName";
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/**
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* Constanat used when the accessible description has changed. Both the old
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* and new values are listed in the event.
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*
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* @see #getAccessibleDescription()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_DESCRIPTION_PROPERTY
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= "AccessibleDescription";
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/**
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* Constant used when the accessibleStateSet has changed. Both the old and
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* new values are listed in the event, although either may be null if a
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* state was disabled at that time.
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*
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* @see #getAccessibleStateSet()
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* @see AccessibleState
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* @see AccessibleStateSet
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_STATE_PROPERTY
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= "AccessibleState";
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/**
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* Constant used when the accessibleValue has changed. Both the old and new
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* values are listed in the event.
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*
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* @see #getAccessibleValue()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_VALUE_PROPERTY
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= "AccessibleValue";
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/**
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* Constant used when the accessibleSelection has changed. Both the old and
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* new values of the event are reserved for future use.
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*
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* @see #getAccessibleSelection()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_SELECTION_PROPERTY
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= "AccessibleSelection";
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/**
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* Constant used when the accessibleText has changed. Both the old and new
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* values of the event are reserved for future use.
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*
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* @see #getAccessibleText()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_TEXT_PROPERTY
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= "AccessibleText";
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/**
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* Constant used when the accessibleText caret has changed. Both the old and
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* new values are listed in the event.
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*
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_CARET_PROPERTY
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= "AccessibleCaret";
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/**
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* Constant used when the visible data has changed. Both the old and new
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* values of the event are reserved for future use.
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*
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_VISIBLE_DATA_PROPERTY
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= "AccessibleVisibleData";
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/**
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* Constant used when children are added or removed. On addition, the new
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* value of the event holds the new child; on removal, the old value holds
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* the removed child.
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*
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_CHILD_PROPERTY
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= "AccessibleChild";
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/**
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* Constant used when active descendent of a component has changed. Both
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* the old and new values are listed in the event.
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*
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public static final String ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY
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= "AccessibleActiveDescendant";
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/**
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* Constant used when the accessible table caption has changed. Both the
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* old and new values are listed in the event.
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*
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* @see Accessible
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* @see AccessibleTable
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*/
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public static final String ACCESSIBLE_TABLE_CAPTION_CHANGED
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= "accessibleTableCaptionChanged";
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/**
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* Constant used when the accessible table summary has changed. Both the
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* old and new values are listed in the event.
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*
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* @see Accessible
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* @see AccessibleTable
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*/
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public static final String ACCESSIBLE_TABLE_SUMMARY_CHANGED
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= "accessibleTableSummaryChanged";
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/**
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* Constant used when the accessible table model has changed. Only the new
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* value of the event has meaning.
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*
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* @see AccessibleTable
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* @see AccessibleTableModelChange
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*/
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public static final String ACCESSIBLE_TABLE_MODEL_CHANGED
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= "accessibleTableModelChanged";
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/**
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* Constant used when the accessible table row header has changed. Only the
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* new value of the event has meaning.
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*
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* @see AccessibleTable
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* @see AccessibleTableModelChange
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*/
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public static final String ACCESSIBLE_TABLE_ROW_HEADER_CHANGED
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= "accessibleTableRowHeaderChanged";
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/**
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* Constant used when the accessible table row description has changed. Only
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* the new value of the event has meaning.
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*
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* @see AccessibleTable
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*/
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public static final String ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED
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= "accessibleTableRowDescriptionChanged";
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/**
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* Constant used when the accessible table column header has changed. Only
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* the new value of the event has meaning.
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*
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* @see AccessibleTable
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* @see AccessibleTableModelChange
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*/
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public static final String ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED
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= "accessibleTableColumnHeaderChanged";
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/**
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* Constant used when the accessible table column description has changed.
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* Only the new value of the event has meaning.
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*
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* @see AccessibleTable
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*/
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public static final String ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED
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= "accessibleTableColumnDescriptionChanged";
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/**
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* Constant used when supported set of actions has changed. Both the old
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* and new values are listed in the event.
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*
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* @see AccessibleAction
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*/
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public static final String ACCESSIBLE_ACTION_PROPERTY
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= "accessibleActionProperty";
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/**
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* Constant used when a hypertext element received focus. Both the old
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* and new values are listed in the event, with -1 indicating that no link
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* had focus.
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*
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* @see AccessibleHyperlink
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*/
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public static final String ACCESSIBLE_HYPERTEXT_OFFSET
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= "AccessibleHypertextOffset";
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/**
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* The accessible parent of this object.
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*
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* @see #getAccessibleParent()
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* @see #setAccessibleParent(Accessible)
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*/
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protected Accessible accessibleParent;
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/**
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* A localized string naming this object.
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*
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* @see #getAccessibleName()
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* @see #setAccessibleName(String)
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*/
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protected String accessibleName;
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/**
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* A localized string describing this object.
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*
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* @see #getAccessibleDescription()
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* @see #setAccessibleDescription(String)
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*/
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protected String accessibleDescription;
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/**
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* The listener tool.
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*
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* @see #addPropertyChangeListener(PropertyChangeListener)
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* @see #removePropertyChangeListener(PropertyChangeListener)
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* @see #firePropertyChange(String, Object, Object)
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*/
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private final PropertyChangeSupport listeners
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= new PropertyChangeSupport(this);
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/**
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* Default constructor.
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*/
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public AccessibleContext()
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{
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}
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/**
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* Get the localized name of the object. For example, a label may just
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* return the text of the label, while an entry field for city may return
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* "city" in en_US.
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*
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* @return the accessible object's name, or null if it is unnamed
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* @see #setAccessibleName(String)
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*/
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public String getAccessibleName()
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{
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return accessibleName;
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}
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/**
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* Set the localized name of the object. This will fire a
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* PropertyChangeEvent with ACCESSIBLE_NAME_PROPERTY.
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*
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* @param s the new name
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* @see #getAccessibleName()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public void setAccessibleName(String s)
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{
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listeners.firePropertyChange(ACCESSIBLE_NAME_PROPERTY, accessibleName, s);
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accessibleName = s;
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}
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/**
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* Get the localized description of the object. For example, a 'Cancel'
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* button may be described as "Ignore changes and close dialog box" in
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* en_US.
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*
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* @return the accessible object's description, or null if there is none
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* @see #setAccessibleDescription(String)
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*/
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public String getAccessibleDescription()
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{
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return accessibleDescription;
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}
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/**
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* Set the localized name of the object. This will fire a
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* PropertyChangeEvent with ACCESSIBLE_DESCRIPTION_PROPERTY.
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*
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* @param s the new description
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* @see #getAccessibleDescription()
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public void setAccessibleDescription(String s)
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{
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listeners.firePropertyChange(ACCESSIBLE_DESCRIPTION_PROPERTY,
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accessibleDescription, s);
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accessibleDescription = s;
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}
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/**
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* Gets the role of this object. For example, a button serves the role of
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* AccessibleRole.PUSH_BUTTON. This allows assistive technologies to funnel
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* similar objects into the same assistance classes. Note that the class
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* is extensible, to define new roles if necessary.
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*
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* @return the role of the object
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* @see AccessibleRole
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*/
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public abstract AccessibleRole getAccessibleRole();
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/**
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* Gets the state set of this object. A change in the state of the object
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* will fire a PropertyChangeEvent for ACCESSIBLE_STATE_PROPERTY.
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*
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* @return the current state of the object
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* @see AccessibleState
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* @see AccessibleStateSet
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public abstract AccessibleStateSet getAccessibleStateSet();
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/**
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* Return the accessible parent of this object.
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*
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* @return the accessible parent, or null if there is none
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*/
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public Accessible getAccessibleParent()
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{
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return accessibleParent;
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}
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/**
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* Sets the accessible parent of this object. This should only be used when
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* the current parent object should not be the accessible parent; only the
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* parent of the accessible child should call this method.
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*
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* @param a the new parent
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*/
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public void setAccessibleParent(Accessible a)
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{
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accessibleParent = a;
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}
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/**
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* Gets the index of this object within its accessible parent.
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*
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* @return the 0-based index, or -1 if there is no accessible parent
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* @see #getAccessibleParent()
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* @see #getAccessibleChildrenCount()
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* @see #getAccessibleChild(int)
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*/
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public abstract int getAccessibleIndexInParent();
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/**
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* Returns the number of accessible children of this object.
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*
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* @return the number of accessible children
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* @see #getAccessibleChild(int)
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*/
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public abstract int getAccessibleChildrenCount();
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/**
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* Returns the specified accessible chile.
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*
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* @param i the 0-based index to get
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* @return the child, or null if out of bounds
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* @see #getAccessibleChildrenCount()
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*/
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public abstract Accessible getAccessibleChild(int i);
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/**
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* Gets the component locale, deferring to the parent if one is not declared.
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*
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* @return the locale
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* @throws java.awt.IllegalComponentStateException if there is no locale
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* or parent
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*/
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public abstract Locale getLocale();
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/**
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* Add a PropertyChangeListener to the listener list. This listener will
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* be notified of all property changes to the accessible object.
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*
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* @param l the listener to add
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* @see #ACCESSIBLE_NAME_PROPERTY
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* @see #ACCESSIBLE_DESCRIPTION_PROPERTY
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* @see #ACCESSIBLE_STATE_PROPERTY
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* @see #ACCESSIBLE_VALUE_PROPERTY
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* @see #ACCESSIBLE_SELECTION_PROPERTY
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* @see #ACCESSIBLE_TEXT_PROPERTY
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* @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY
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* @see #removePropertyChangeListener(PropertyChangeListener)
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*/
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public void addPropertyChangeListener(PropertyChangeListener l)
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{
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listeners.addPropertyChangeListener(l);
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}
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/**
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* Remove a PropertyChangeListener from the listener list.
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*
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* @param l the listener to remove
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* @see #addPropertyChangeListener(PropertyChangeListener)
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*/
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public void removePropertyChangeListener(PropertyChangeListener l)
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{
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listeners.removePropertyChangeListener(l);
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}
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/**
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* Get any supported accessible actions. The default implementation returns
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* null.
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*
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* @return the supported action, or null
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* @see AccessibleAction
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*/
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public AccessibleAction getAccessibleAction()
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{
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return null;
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}
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/**
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* Get any supported accessible compoent. The default implementation returns
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* null.
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*
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* @return the supported component, or null
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* @see AccessibleComponent
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*/
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public AccessibleComponent getAccessibleComponent()
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{
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return null;
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}
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/**
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* Get any supported accessible selection. The default implementation returns
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* null.
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*
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* @return the supported selection, or null
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* @see AccessibleSelection
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*/
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public AccessibleSelection getAccessibleSelection()
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{
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return null;
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}
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/**
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* Get any supported accessible text. The default implementation returns
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* null.
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*
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* @return the supported text, or null
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* @see AccessibleText
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*/
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public AccessibleText getAccessibleText()
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{
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return null;
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}
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/**
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* Get any supported accessible editable text. The default implementation
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* returns null.
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*
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* @return the supported editable text, or null
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* @see AccessibleEditableText
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*/
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public AccessibleEditableText getAccessibleEditableText()
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{
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return null;
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}
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/**
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* Get any supported accessible value. The default implementation returns
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* null.
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*
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* @return the supported value, or null
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* @see AccessibleValue
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*/
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public AccessibleValue getAccessibleValue()
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{
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return null;
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}
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/**
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* Get all supported accessible icons. The default implementation returns
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* null.
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*
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* @return the supported icons, or null
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* @see AccessibleIcon
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*/
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public AccessibleIcon[] getAccessibleIcon()
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{
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return null;
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}
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/**
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* Get any supported accessible relation set. The default implementation
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* returns null.
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*
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* @return the supported relation set, or null
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* @see AccessibleRelationSet
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*/
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public AccessibleRelationSet getAccessibleRelationSet()
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{
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return null;
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}
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/**
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* Get any supported accessible table. The default implementation returns
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* null.
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*
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* @return the supported table, or null
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* @see AccessibleTable
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*/
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public AccessibleTable getAccessibleTable()
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{
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return null;
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}
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/**
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* Fire an event to report property changes. This is intended for use by
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* the accessible objects, not general application programs. If oldValue and
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* newValue differ, and the listenter list is not empty, a PropertyChange
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* event is fired to each listener.
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*
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* @param name the property name
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* @param oldValue the prior value
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* @param newValue the updated value
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* @see PropertyChangeSupport
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* @see #addPropertyChangeListener(PropertyChangeListener)
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* @see #removePropertyChangeListener(PropertyChangeListener)
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* @see #ACCESSIBLE_NAME_PROPERTY
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* @see #ACCESSIBLE_DESCRIPTION_PROPERTY
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* @see #ACCESSIBLE_STATE_PROPERTY
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* @see #ACCESSIBLE_VALUE_PROPERTY
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* @see #ACCESSIBLE_SELECTION_PROPERTY
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* @see #ACCESSIBLE_TEXT_PROPERTY
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* @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY
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*/
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public void firePropertyChange(String name, Object oldValue, Object newValue)
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{
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listeners.firePropertyChange(name, oldValue, newValue);
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}
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} // class AccessibleContext
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