AccessibleContext.java revision 0
2N/A * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. 2N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 2N/A * This code is free software; you can redistribute it and/or modify it 2N/A * under the terms of the GNU General Public License version 2 only, as 2N/A * published by the Free Software Foundation. Sun designates this 2N/A * particular file as subject to the "Classpath" exception as provided 2N/A * by Sun in the LICENSE file that accompanied this code. 2N/A * This code is distributed in the hope that it will be useful, but WITHOUT 2N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 2N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 2N/A * version 2 for more details (a copy is included in the LICENSE file that 2N/A * accompanied this code). 2N/A * You should have received a copy of the GNU General Public License version 2N/A * 2 along with this work; if not, write to the Free Software Foundation, 2N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 2N/A * CA 95054 USA or visit www.sun.com if you need additional information or 2N/A * have any questions. 2N/A * AccessibleContext represents the minimum information all accessible objects 2N/A * return. This information includes the accessible name, description, role, 2N/A * and state of the object, as well as information about its parent and 2N/A * children. AccessibleContext also contains methods for 2N/A * obtaining more specific accessibility information about a component. 2N/A * If the component supports them, these methods will return an object that 2N/A * implements one or more of the following interfaces: 2N/A * <li>{@link AccessibleAction} - the object can perform one or more actions. 2N/A * This interface provides the standard mechanism for an assistive 2N/A * technology to determine what those actions are and tell the object 2N/A * to perform them. Any object that can be manipulated should 2N/A * support this interface. 2N/A * <li>{@link AccessibleComponent} - the object has a graphical representation. 2N/A * This interface provides the standard mechanism for an assistive 2N/A * technology to determine and set the graphical representation of the 2N/A * object. Any object that is rendered on the screen should support 2N/A * <li>{@link AccessibleSelection} - the object allows its children to be 2N/A * selected. This interface provides the standard mechanism for an 2N/A * assistive technology to determine the currently selected children of the object 2N/A * as well as modify its selection set. Any object that has children 2N/A * that can be selected should support this interface. 2N/A * <li>{@link AccessibleText} - the object presents editable textual information 2N/A * on the display. This interface provides the standard mechanism for 2N/A * an assistive technology to access that text via its content, attributes, 2N/A * and spatial location. Any object that contains editable text should 2N/A * support this interface. 2N/A * <li>{@link AccessibleValue} - the object supports a numerical value. This 2N/A * interface provides the standard mechanism for an assistive technology 2N/A * to determine and set the current value of the object, as well as obtain its 2N/A * minimum and maximum values. Any object that supports a numerical value 2N/A * should support this interface.</ul> 2N/A * attribute: isContainer false 2N/A * description: Minimal information that all accessible objects return 2N/A * @author Peter Korn 2N/A * @author Hans Muller 2N/A * @author Willie Walker 2N/A * @author Lynn Monsanto 2N/A * Constant used to determine when the accessibleName property has 2N/A * changed. The old value in the PropertyChangeEvent will be the old 2N/A * accessibleName and the new value will be the new accessibleName. 2N/A * @see #getAccessibleName 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the accessibleDescription property has 2N/A * changed. The old value in the PropertyChangeEvent will be the 2N/A * old accessibleDescription and the new value will be the new 2N/A * accessibleDescription. 2N/A * @see #getAccessibleDescription 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the accessibleStateSet property has 2N/A * changed. The old value will be the old AccessibleState and the new 2N/A * value will be the new AccessibleState in the accessibleStateSet. 2N/A * For example, if a component that supports the vertical and horizontal 2N/A * states changes its orientation from vertical to horizontal, the old 2N/A * value will be AccessibleState.VERTICAL and the new value will be 2N/A * AccessibleState.HORIZONTAL. Please note that either value can also 2N/A * be null. For example, when a component changes from being enabled 2N/A * to disabled, the old value will be AccessibleState.ENABLED 2N/A * and the new value will be null. 2N/A * @see #getAccessibleStateSet 2N/A * @see AccessibleState 2N/A * @see AccessibleStateSet 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the accessibleValue property has 2N/A * changed. The old value in the PropertyChangeEvent will be a Number 2N/A * representing the old value and the new value will be a Number 2N/A * representing the new value 2N/A * @see #getAccessibleValue 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the accessibleSelection has changed. 2N/A * The old and new values in the PropertyChangeEvent are currently 2N/A * reserved for future use. 2N/A * @see #getAccessibleSelection 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the accessibleText caret has changed. 2N/A * The old value in the PropertyChangeEvent will be an 2N/A * integer representing the old caret position, and the new value will 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the visual appearance of the object 2N/A * has changed. The old and new values in the PropertyChangeEvent are 2N/A * currently reserved for future use. 2N/A * @see #addPropertyChangeListener 2N/A * from the object. If an Accessible child is being added, the old 2N/A * value will be null and the new value will be the Accessible child. If an 2N/A * Accessible child is being removed, the old value will be the Accessible 2N/A * child, and the new value will be null. 2N/A * @see #addPropertyChangeListener 2N/A * Constant used to determine when the active descendant of a component 2N/A * has changed. The active descendant is used for objects such as * list, tree, and table, which may have transient children. When the * active descendant has changed, the old value of the property change * event will be the Accessible representing the previous active child, and * the new value will be the Accessible representing the current active * @see #addPropertyChangeListener * Constant used to indicate that the table caption has changed * The old value in the PropertyChangeEvent will be an Accessible * representing the previous table caption and the new value will * be an Accessible representing the new table caption. "accessibleTableCaptionChanged";
* Constant used to indicate that the table summary has changed * The old value in the PropertyChangeEvent will be an Accessible * representing the previous table summary and the new value will * be an Accessible representing the new table summary. "accessibleTableSummaryChanged";
* Constant used to indicate that table data has changed. * The old value in the PropertyChangeEvent will be null and the * new value will be an AccessibleTableModelChange representing * @see AccessibleTableModelChange "accessibleTableModelChanged";
* Constant used to indicate that the row header has changed * The old value in the PropertyChangeEvent will be null and the * new value will be an AccessibleTableModelChange representing * @see AccessibleTableModelChange "accessibleTableRowHeaderChanged";
* Constant used to indicate that the row description has changed * The old value in the PropertyChangeEvent will be null and the * new value will be an Integer representing the row index. "accessibleTableRowDescriptionChanged";
* Constant used to indicate that the column header has changed * The old value in the PropertyChangeEvent will be null and the * new value will be an AccessibleTableModelChange representing * @see AccessibleTableModelChange "accessibleTableColumnHeaderChanged";
* Constant used to indicate that the column description has changed * The old value in the PropertyChangeEvent will be null and the * new value will be an Integer representing the column index. "accessibleTableColumnDescriptionChanged";
* Constant used to indicate that the supported set of actions * has changed. The old value in the PropertyChangeEvent will * be an Integer representing the old number of actions supported * and the new value will be an Integer representing the new * number of actions supported. "accessibleActionProperty";
* Constant used to indicate that a hypertext element has received focus. * The old value in the PropertyChangeEvent will be an Integer * representing the start index in the document of the previous element * that had focus and the new value will be an Integer representing * the start index in the document of the current element that has * focus. A value of -1 indicates that an element does not or did * @see AccessibleHyperlink "AccessibleHypertextOffset";
* PropertyChangeEvent which indicates that text has changed. * For text insertion, the oldValue is null and the newValue * is an AccessibleTextSequence specifying the text that was * For text deletion, the oldValue is an AccessibleTextSequence * specifying the text that was deleted and the newValue is null. * For text replacement, the oldValue is an AccessibleTextSequence * specifying the old text and the newValue is an AccessibleTextSequence * specifying the new text. * @see #getAccessibleText * @see #addPropertyChangeListener * @see #AccessibleText.AccessibleTextSequence * PropertyChangeEvent which indicates that a significant change * has occurred to the children of a component like a tree or text. * This change notifies the event listener that it needs to * reacquire the state of the subcomponents. The oldValue is * null and the newValue is the component whose children have * @see #getAccessibleText * @see #addPropertyChangeListener * @see #AccessibleText.AccessibleTextSequence "accessibleInvalidateChildren";
* PropertyChangeEvent which indicates that text attributes have changed. * For attribute insertion, the oldValue is null and the newValue * is an AccessibleAttributeSequence specifying the attributes that were * For attribute deletion, the oldValue is an AccessibleAttributeSequence * specifying the attributes that were deleted and the newValue is null. * For attribute replacement, the oldValue is an AccessibleAttributeSequence * specifying the old attributes and the newValue is an * AccessibleAttributeSequence specifying the new attributes. * @see #getAccessibleText * @see #addPropertyChangeListener * @see #AccessibleText.AccessibleAttributeSequence "accessibleTextAttributesChanged";
* PropertyChangeEvent which indicates that a change has occurred * in a component's bounds. * The oldValue is the old component bounds and the newValue is * the new component bounds. * @see #addPropertyChangeListener "accessibleComponentBoundsChanged";
* The accessible parent of this object. * @see #getAccessibleParent * @see #setAccessibleParent * A localized String containing the name of the object. * @see #getAccessibleName * @see #setAccessibleName * A localized String containing the description of the object. * @see #getAccessibleDescription * @see #setAccessibleDescription * Used to handle the listener list for property change events. * @see #addPropertyChangeListener * @see #removePropertyChangeListener * @see #firePropertyChangeListener * Used to represent the context's relation set * @see #getAccessibleRelationSet * Gets the accessibleName property of this object. The accessibleName * property of an object is a localized String that designates the purpose * of the object. For example, the accessibleName property of a label * or button might be the text of the label or button itself. In the * case of an object that doesn't display its name, the accessibleName * should still be set. For example, in the case of a text field used * to enter the name of a city, the accessibleName for the en_US locale * @return the localized name of the object; null if this * object does not have a name * @see #setAccessibleName * Sets the localized accessible name of this object. Changing the * name will cause a PropertyChangeEvent to be fired for the * ACCESSIBLE_NAME_PROPERTY property. * @param s the new localized name of the object. * @see #getAccessibleName * @see #addPropertyChangeListener * description: Sets the accessible name for the component. * Gets the accessibleDescription property of this object. The * accessibleDescription property of this object is a short localized * phrase describing the purpose of the object. For example, in the * case of a 'Cancel' button, the accessibleDescription could be * 'Ignore changes and close dialog box.' * @return the localized description of the object; null if * this object does not have a description * @see #setAccessibleDescription * Sets the accessible description of this object. Changing the * name will cause a PropertyChangeEvent to be fired for the * ACCESSIBLE_DESCRIPTION_PROPERTY property. * @param s the new localized description of the object * @see #setAccessibleName * @see #addPropertyChangeListener * description: Sets the accessible description for the component. * Gets the role of this object. The role of the object is the generic * purpose or use of the class of this object. For example, the role * of a push button is AccessibleRole.PUSH_BUTTON. The roles in * AccessibleRole are provided so component developers can pick from * a set of predefined roles. This enables assistive technologies to * provide a consistent interface to various tweaked subclasses of * components (e.g., use AccessibleRole.PUSH_BUTTON for all components * that act like a push button) as well as distinguish between sublasses * that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes * and AccessibleRole.RADIO_BUTTON for radio buttons). * <p>Note that the AccessibleRole class is also extensible, so * custom component developers can define their own AccessibleRole's * if the set of predefined roles is inadequate. * @return an instance of AccessibleRole describing the role of the object * Gets the state set of this object. The AccessibleStateSet of an object * is composed of a set of unique AccessibleStates. A change in the * AccessibleStateSet of an object will cause a PropertyChangeEvent to * be fired for the ACCESSIBLE_STATE_PROPERTY property. * @return an instance of AccessibleStateSet containing the * current state set of the object * @see AccessibleStateSet * @see #addPropertyChangeListener * Gets the Accessible parent of this object. * @return the Accessible parent of this object; null if this * object does not have an Accessible parent * Sets the Accessible parent of this object. This is meant to be used * only in the situations where the actual component's parent should * not be treated as the component's accessible parent and is a method * that should only be called by the parent of the accessible child. * @param a - Accessible to be set as the parent * Gets the 0-based index of this object in its accessible parent. * @return the 0-based index of this object in its parent; -1 if this * object does not have an accessible parent. * @see #getAccessibleParent * @see #getAccessibleChildrenCount * @see #getAccessibleChild * Returns the number of accessible children of the object. * @return the number of accessible children of the object. * Returns the specified Accessible child of the object. The Accessible * children of an Accessible object are zero-based, so the first child * of an Accessible child is at index 0, the second child is at index 1, * @param i zero-based index of child * @return the Accessible child of the object * @see #getAccessibleChildrenCount * Gets the locale of the component. If the component does not have a * locale, then the locale of its parent is returned. * @return this component's locale. If this component does not have * a locale, the locale of its parent is returned. * @exception IllegalComponentStateException * If the Component does not have its own locale and has not yet been * added to a containment hierarchy such that the locale can be * determined from the containing parent. * Adds a PropertyChangeListener to the listener list. * The listener is registered for all Accessible properties and will * be called when those properties change. * @see #ACCESSIBLE_NAME_PROPERTY * @see #ACCESSIBLE_DESCRIPTION_PROPERTY * @see #ACCESSIBLE_STATE_PROPERTY * @see #ACCESSIBLE_VALUE_PROPERTY * @see #ACCESSIBLE_SELECTION_PROPERTY * @see #ACCESSIBLE_TEXT_PROPERTY * @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY * @param listener The PropertyChangeListener to be added * Removes a PropertyChangeListener from the listener list. * This removes a PropertyChangeListener that was registered * @param listener The PropertyChangeListener to be removed * Gets the AccessibleAction associated with this object that supports * @return AccessibleAction if supported by object; else return null * Gets the AccessibleComponent associated with this object that has a * graphical representation. * @return AccessibleComponent if supported by object; else return null * @see AccessibleComponent * Gets the AccessibleSelection associated with this object which allows its * Accessible children to be selected. * @return AccessibleSelection if supported by object; else return null * @see AccessibleSelection * Gets the AccessibleText associated with this object presenting * @return AccessibleText if supported by object; else return null * Gets the AccessibleEditableText associated with this object * presenting editable text on the display. * @return AccessibleEditableText if supported by object; else return null * @see AccessibleEditableText * Gets the AccessibleValue associated with this object that supports a * @return AccessibleValue if supported by object; else return null * Gets the AccessibleIcons associated with an object that has * one or more associated icons * @return an array of AccessibleIcon if supported by object; * Gets the AccessibleRelationSet associated with an object * @return an AccessibleRelationSet if supported by object; * @see AccessibleRelationSet * Gets the AccessibleTable associated with an object * @return an AccessibleTable if supported by object; * Support for reporting bound property changes. If oldValue and * newValue are not equal and the PropertyChangeEvent listener list * is not empty, then fire a PropertyChange event to each listener. * In general, this is for use by the Accessible objects themselves * and should not be called by an application program. * @param propertyName The programmatic name of the property that * @param oldValue The old value of the property. * @param newValue The new value of the property. * @see java.beans.PropertyChangeSupport * @see #addPropertyChangeListener * @see #removePropertyChangeListener * @see #ACCESSIBLE_NAME_PROPERTY * @see #ACCESSIBLE_DESCRIPTION_PROPERTY * @see #ACCESSIBLE_STATE_PROPERTY * @see #ACCESSIBLE_VALUE_PROPERTY * @see #ACCESSIBLE_SELECTION_PROPERTY * @see #ACCESSIBLE_TEXT_PROPERTY * @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY