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/* 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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|
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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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|
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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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|
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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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|
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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 IllegalComponentStateException if there is no locale or parent |
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*/ |
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public abstract Locale getLocale(); |
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|
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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* Get any supported accessible text. The default implementation returns |
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* null. |
495 |
|
* |
496 |
|
* @return the supported text, or null |
497 |
|
* @see AccessibleText |
498 |
|
*/ |
499 |
|
public AccessibleText getAccessibleText() |
500 |
|
{ |
501 |
|
return null; |
502 |
|
} |
503 |
|
|
504 |
|
/** |
505 |
|
* Get any supported accessible editable text. The default implementation |
506 |
|
* returns null. |
507 |
|
* |
508 |
|
* @return the supported editable text, or null |
509 |
|
* @see AccessibleEditableText |
510 |
|
*/ |
511 |
|
public AccessibleEditableText getAccessibleEditableText() |
512 |
|
{ |
513 |
|
return null; |
514 |
|
} |
515 |
|
|
516 |
|
/** |
517 |
|
* Get any supported accessible value. The default implementation returns |
518 |
|
* null. |
519 |
|
* |
520 |
|
* @return the supported value, or null |
521 |
|
* @see AccessibleValue |
522 |
|
*/ |
523 |
|
public AccessibleValue getAccessibleValue() |
524 |
|
{ |
525 |
|
return null; |
526 |
|
} |
527 |
|
|
528 |
|
/** |
529 |
|
* Get all supported accessible icons. The default implementation returns |
530 |
|
* null. |
531 |
|
* |
532 |
|
* @return the supported icons, or null |
533 |
|
* @see AccessibleIcon |
534 |
|
*/ |
535 |
|
public AccessibleIcon[] getAccessibleIcon() |
536 |
|
{ |
537 |
|
return null; |
538 |
|
} |
539 |
|
|
540 |
|
/** |
541 |
|
* Get any supported accessible relation set. The default implementation |
542 |
|
* returns null. |
543 |
|
* |
544 |
|
* @return the supported relation set, or null |
545 |
|
* @see AccessibleRelationSet |
546 |
|
*/ |
547 |
|
public AccessibleRelationSet getAccessibleRelationSet() |
548 |
|
{ |
549 |
|
return null; |
550 |
|
} |
551 |
|
|
552 |
|
/** |
553 |
|
* Get any supported accessible table. The default implementation returns |
554 |
|
* null. |
555 |
|
* |
556 |
|
* @return the supported table, or null |
557 |
|
* @see AccessibleTable |
558 |
|
*/ |
559 |
|
public AccessibleTable getAccessibleTable() |
560 |
|
{ |
561 |
|
return null; |
562 |
|
} |
563 |
|
|
564 |
|
/** |
565 |
|
* Fire an event to report property changes. This is intended for use by |
566 |
|
* the accessible objects, not general application programs. If oldValue and |
567 |
|
* newValue differ, and the listenter list is not empty, a PropertyChange |
568 |
|
* event is fired to each listener. |
569 |
|
* |
570 |
|
* @param name the property name |
571 |
|
* @param oldValue the prior value |
572 |
|
* @param newValue the updated value |
573 |
|
* @see PropertyChangeSupport |
574 |
|
* @see #addPropertyChangeListener(PropertyChangeListener) |
575 |
|
* @see #removePropertyChangeListener(PropertyChangeListener) |
576 |
|
* @see #ACCESSIBLE_NAME_PROPERTY |
577 |
|
* @see #ACCESSIBLE_DESCRIPTION_PROPERTY |
578 |
|
* @see #ACCESSIBLE_STATE_PROPERTY |
579 |
|
* @see #ACCESSIBLE_VALUE_PROPERTY |
580 |
|
* @see #ACCESSIBLE_SELECTION_PROPERTY |
581 |
|
* @see #ACCESSIBLE_TEXT_PROPERTY |
582 |
|
* @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY |
583 |
|
*/ |
584 |
|
public void firePropertyChange(String name, Object oldValue, Object newValue) |
585 |
|
{ |
586 |
|
listeners.firePropertyChange(name, oldValue, newValue); |
587 |
|
} |
588 |
|
} // class AccessibleContext |