- java.lang.Object
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- javax.accessibility.AccessibleContext
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- Direct Known Subclasses:
Component.AccessibleAWTComponent,ImageIcon.AccessibleImageIcon,JList.AccessibleJList.AccessibleJListChild,JTable.AccessibleJTable.AccessibleJTableCell,JTableHeader.AccessibleJTableHeader.AccessibleJTableHeaderEntry,JTree.AccessibleJTree.AccessibleJTreeNode,MenuComponent.AccessibleAWTMenuComponent,ProgressMonitor.AccessibleProgressMonitor,Translator
@JavaBean(description="Minimal information that all accessible objects return") public abstract class AccessibleContext extends Object
AccessibleContextrepresents the minimum information all accessible objects return. This information includes the accessible name, description, role, and state of the object, as well as information about its parent and children.AccessibleContextalso contains methods for obtaining more specific accessibility information about a component. If the component supports them, these methods will return an object that implements one or more of the following interfaces:AccessibleAction- the object can perform one or more actions. This interface provides the standard mechanism for an assistive technology to determine what those actions are and tell the object to perform them. Any object that can be manipulated should support this interface.AccessibleComponent- the object has a graphical representation. This interface provides the standard mechanism for an assistive technology to determine and set the graphical representation of the object. Any object that is rendered on the screen should support this interface.AccessibleSelection- the object allows its children to be selected. This interface provides the standard mechanism for an assistive technology to determine the currently selected children of the object as well as modify its selection set. Any object that has children that can be selected should support this interface.AccessibleText- the object presents editable textual information on the display. This interface provides the standard mechanism for an assistive technology to access that text via its content, attributes, and spatial location. Any object that contains editable text should support this interface.AccessibleValue- the object supports a numerical value. This interface provides the standard mechanism for an assistive technology to determine and set the current value of the object, as well as obtain its minimum and maximum values. Any object that supports a numerical value should support this interface.
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Field Summary
Fields Modifier and Type Field Description static StringACCESSIBLE_ACTION_PROPERTYConstant used to indicate that the supported set of actions has changed.static StringACCESSIBLE_ACTIVE_DESCENDANT_PROPERTYConstant used to determine when the active descendant of a component has changed.static StringACCESSIBLE_CARET_PROPERTYConstant used to determine when theaccessibleTextcaret has changed.static StringACCESSIBLE_CHILD_PROPERTYConstant used to determine whenAccessiblechildren are added/removed from the object.static StringACCESSIBLE_COMPONENT_BOUNDS_CHANGEDPropertyChangeEventwhich indicates that a change has occurred in a component's bounds.static StringACCESSIBLE_DESCRIPTION_PROPERTYConstant used to determine when theaccessibleDescriptionproperty has changed.static StringACCESSIBLE_HYPERTEXT_OFFSETConstant used to indicate that a hypertext element has received focus.static StringACCESSIBLE_INVALIDATE_CHILDRENPropertyChangeEventwhich indicates that a significant change has occurred to the children of a component like a tree or text.static StringACCESSIBLE_NAME_PROPERTYConstant used to determine when theaccessibleNameproperty has changed.static StringACCESSIBLE_SELECTION_PROPERTYConstant used to determine when theaccessibleSelectionhas changed.static StringACCESSIBLE_STATE_PROPERTYConstant used to determine when theaccessibleStateSetproperty has changed.static StringACCESSIBLE_TABLE_CAPTION_CHANGEDConstant used to indicate that the table caption has changed.static StringACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGEDConstant used to indicate that the column description has changed.static StringACCESSIBLE_TABLE_COLUMN_HEADER_CHANGEDConstant used to indicate that the column header has changed.static StringACCESSIBLE_TABLE_MODEL_CHANGEDConstant used to indicate that table data has changed.static StringACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGEDConstant used to indicate that the row description has changed.static StringACCESSIBLE_TABLE_ROW_HEADER_CHANGEDConstant used to indicate that the row header has changed.static StringACCESSIBLE_TABLE_SUMMARY_CHANGEDConstant used to indicate that the table summary has changed.static StringACCESSIBLE_TEXT_ATTRIBUTES_CHANGEDPropertyChangeEventwhich indicates that text attributes have changed.static StringACCESSIBLE_TEXT_PROPERTYPropertyChangeEventwhich indicates that text has changed.static StringACCESSIBLE_VALUE_PROPERTYConstant used to determine when theaccessibleValueproperty has changed.static StringACCESSIBLE_VISIBLE_DATA_PROPERTYConstant used to determine when the visual appearance of the object has changed.protected StringaccessibleDescriptionA localized String containing the description of the object.protected StringaccessibleNameA localized String containing the name of the object.protected AccessibleaccessibleParentThe accessible parent of this object.
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Constructor Summary
Constructors Constructor Description AccessibleContext()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description voidaddPropertyChangeListener(PropertyChangeListener listener)Adds aPropertyChangeListenerto the listener list.voidfirePropertyChange(String propertyName, Object oldValue, Object newValue)Support for reporting bound property changes.AccessibleActiongetAccessibleAction()Gets theAccessibleActionassociated with this object that supports one or more actions.abstract AccessiblegetAccessibleChild(int i)Returns the specifiedAccessiblechild of the object.abstract intgetAccessibleChildrenCount()Returns the number of accessible children of the object.AccessibleComponentgetAccessibleComponent()Gets theAccessibleComponentassociated with this object that has a graphical representation.StringgetAccessibleDescription()Gets theaccessibleDescriptionproperty of this object.AccessibleEditableTextgetAccessibleEditableText()Gets theAccessibleEditableTextassociated with this object presenting editable text on the display.AccessibleIcon[]getAccessibleIcon()Gets theAccessibleIconsassociated with an object that has one or more associated icons.abstract intgetAccessibleIndexInParent()Gets the 0-based index of this object in its accessible parent.StringgetAccessibleName()Gets theaccessibleNameproperty of this object.AccessiblegetAccessibleParent()Gets theAccessibleparent of this object.AccessibleRelationSetgetAccessibleRelationSet()Gets theAccessibleRelationSetassociated with an object.abstract AccessibleRolegetAccessibleRole()Gets the role of this object.AccessibleSelectiongetAccessibleSelection()Gets theAccessibleSelectionassociated with this object which allows itsAccessiblechildren to be selected.abstract AccessibleStateSetgetAccessibleStateSet()Gets the state set of this object.AccessibleTablegetAccessibleTable()Gets theAccessibleTableassociated with an object.AccessibleTextgetAccessibleText()Gets theAccessibleTextassociated with this object presenting text on the display.AccessibleValuegetAccessibleValue()Gets theAccessibleValueassociated with this object that supports aNumericalvalue.abstract LocalegetLocale()Gets the locale of the component.voidremovePropertyChangeListener(PropertyChangeListener listener)Removes aPropertyChangeListenerfrom the listener list.voidsetAccessibleDescription(String s)Sets the accessible description of this object.voidsetAccessibleName(String s)Sets the localized accessible name of this object.voidsetAccessibleParent(Accessible a)Sets theAccessibleparent of this object.
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Field Detail
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ACCESSIBLE_NAME_PROPERTY
public static final String ACCESSIBLE_NAME_PROPERTY
Constant used to determine when theaccessibleNameproperty has changed. The old value in thePropertyChangeEventwill be the oldaccessibleNameand the new value will be the newaccessibleName.
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ACCESSIBLE_DESCRIPTION_PROPERTY
public static final String ACCESSIBLE_DESCRIPTION_PROPERTY
Constant used to determine when theaccessibleDescriptionproperty has changed. The old value in thePropertyChangeEventwill be the oldaccessibleDescriptionand the new value will be the newaccessibleDescription.
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ACCESSIBLE_STATE_PROPERTY
public static final String ACCESSIBLE_STATE_PROPERTY
Constant used to determine when theaccessibleStateSetproperty has changed. The old value will be the oldAccessibleStateand the new value will be the newAccessibleStatein theaccessibleStateSet. For example, if a component that supports the vertical and horizontal states changes its orientation from vertical to horizontal, the old value will beAccessibleState.VERTICALand the new value will beAccessibleState.HORIZONTAL. Please note that either value can also benull. For example, when a component changes from being enabled to disabled, the old value will beAccessibleState.ENABLEDand the new value will benull.
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ACCESSIBLE_VALUE_PROPERTY
public static final String ACCESSIBLE_VALUE_PROPERTY
Constant used to determine when theaccessibleValueproperty has changed. The old value in thePropertyChangeEventwill be aNumberrepresenting the old value and the new value will be aNumberrepresenting the new value.
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ACCESSIBLE_SELECTION_PROPERTY
public static final String ACCESSIBLE_SELECTION_PROPERTY
Constant used to determine when theaccessibleSelectionhas changed. The old and new values in thePropertyChangeEventare currently reserved for future use.
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ACCESSIBLE_CARET_PROPERTY
public static final String ACCESSIBLE_CARET_PROPERTY
Constant used to determine when theaccessibleTextcaret has changed. The old value in thePropertyChangeEventwill be an integer representing the old caret position, and the new value will be an integer representing the new/current caret position.
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ACCESSIBLE_VISIBLE_DATA_PROPERTY
public static final String ACCESSIBLE_VISIBLE_DATA_PROPERTY
Constant used to determine when the visual appearance of the object has changed. The old and new values in thePropertyChangeEventare currently reserved for future use.
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ACCESSIBLE_CHILD_PROPERTY
public static final String ACCESSIBLE_CHILD_PROPERTY
Constant used to determine whenAccessiblechildren are added/removed from the object. If anAccessiblechild is being added, the old value will benulland the new value will be theAccessiblechild. If anAccessiblechild is being removed, the old value will be theAccessiblechild, and the new value will benull.
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ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY
public static final String ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY
Constant used to determine when the active descendant of a component 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 theAccessiblerepresenting the previous active child, and the new value will be theAccessiblerepresenting the current active child.
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ACCESSIBLE_TABLE_CAPTION_CHANGED
public static final String ACCESSIBLE_TABLE_CAPTION_CHANGED
Constant used to indicate that the table caption has changed. The old value in thePropertyChangeEventwill be anAccessiblerepresenting the previous table caption and the new value will be anAccessiblerepresenting the new table caption.- See Also:
Accessible,AccessibleTable, Constant Field Values
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ACCESSIBLE_TABLE_SUMMARY_CHANGED
public static final String ACCESSIBLE_TABLE_SUMMARY_CHANGED
Constant used to indicate that the table summary has changed. The old value in thePropertyChangeEventwill be anAccessiblerepresenting the previous table summary and the new value will be anAccessiblerepresenting the new table summary.- See Also:
Accessible,AccessibleTable, Constant Field Values
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ACCESSIBLE_TABLE_MODEL_CHANGED
public static final String ACCESSIBLE_TABLE_MODEL_CHANGED
Constant used to indicate that table data has changed. The old value in thePropertyChangeEventwill benulland the new value will be anAccessibleTableModelChangerepresenting the table change.
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ACCESSIBLE_TABLE_ROW_HEADER_CHANGED
public static final String ACCESSIBLE_TABLE_ROW_HEADER_CHANGED
Constant used to indicate that the row header has changed. The old value in thePropertyChangeEventwill benulland the new value will be anAccessibleTableModelChangerepresenting the header change.
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ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED
public static final String ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED
Constant used to indicate that the row description has changed. The old value in thePropertyChangeEventwill benulland the new value will be anIntegerrepresenting the row index.- See Also:
AccessibleTable, Constant Field Values
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ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED
public static final String ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED
Constant used to indicate that the column header has changed. The old value in thePropertyChangeEventwill benulland the new value will be anAccessibleTableModelChangerepresenting the header change.
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ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED
public static final String ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED
Constant used to indicate that the column description has changed. The old value in thePropertyChangeEventwill benulland the new value will be anIntegerrepresenting the column index.- See Also:
AccessibleTable, Constant Field Values
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ACCESSIBLE_ACTION_PROPERTY
public static final String ACCESSIBLE_ACTION_PROPERTY
Constant used to indicate that the supported set of actions has changed. The old value in thePropertyChangeEventwill be anIntegerrepresenting the old number of actions supported and the new value will be anIntegerrepresenting the new number of actions supported.- See Also:
AccessibleAction, Constant Field Values
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ACCESSIBLE_HYPERTEXT_OFFSET
public static final String ACCESSIBLE_HYPERTEXT_OFFSET
Constant used to indicate that a hypertext element has received focus. The old value in thePropertyChangeEventwill be anIntegerrepresenting the start index in the document of the previous element that had focus and the new value will be anIntegerrepresenting 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 not have focus.- See Also:
AccessibleHyperlink, Constant Field Values
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ACCESSIBLE_TEXT_PROPERTY
public static final String ACCESSIBLE_TEXT_PROPERTY
PropertyChangeEventwhich indicates that text has changed.
For text insertion, theoldValueisnulland thenewValueis anAccessibleTextSequencespecifying the text that was inserted.
For text deletion, theoldValueis anAccessibleTextSequencespecifying the text that was deleted and thenewValueisnull.
For text replacement, theoldValueis anAccessibleTextSequencespecifying the old text and thenewValueis anAccessibleTextSequencespecifying the new text.
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ACCESSIBLE_INVALIDATE_CHILDREN
public static final String ACCESSIBLE_INVALIDATE_CHILDREN
PropertyChangeEventwhich 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. TheoldValueisnulland thenewValueis the component whose children have become invalid.
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ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED
public static final String ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED
PropertyChangeEventwhich indicates that text attributes have changed.
For attribute insertion, theoldValueisnulland thenewValueis anAccessibleAttributeSequencespecifying the attributes that were inserted.
For attribute deletion, theoldValueis anAccessibleAttributeSequencespecifying the attributes that were deleted and thenewValueisnull.
For attribute replacement, theoldValueis anAccessibleAttributeSequencespecifying the old attributes and thenewValueis anAccessibleAttributeSequencespecifying the new attributes.
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ACCESSIBLE_COMPONENT_BOUNDS_CHANGED
public static final String ACCESSIBLE_COMPONENT_BOUNDS_CHANGED
PropertyChangeEventwhich indicates that a change has occurred in a component's bounds. TheoldValueis the old component bounds and thenewValueis the new component bounds.- Since:
- 1.5
- See Also:
addPropertyChangeListener(java.beans.PropertyChangeListener), Constant Field Values
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accessibleParent
protected Accessible accessibleParent
The accessible parent of this object.
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accessibleName
protected String accessibleName
A localized String containing the name of the object.
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accessibleDescription
protected String accessibleDescription
A localized String containing the description of the object.
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Method Detail
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getAccessibleName
public String getAccessibleName()
Gets theaccessibleNameproperty of this object. TheaccessibleNameproperty of an object is a localizedStringthat designates the purpose of the object. For example, theaccessibleNameproperty 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, theaccessibleNameshould still be set. For example, in the case of a text field used to enter the name of a city, theaccessibleNamefor theen_USlocale could be 'city.'- Returns:
- the localized name of the object;
nullif this object does not have a name - See Also:
setAccessibleName(java.lang.String)
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setAccessibleName
@BeanProperty(preferred=true, description="Sets the accessible name for the component.") public void setAccessibleName(String s)
Sets the localized accessible name of this object. Changing the name will cause aPropertyChangeEventto be fired for theACCESSIBLE_NAME_PROPERTYproperty.- Parameters:
s- the new localized name of the object- See Also:
getAccessibleName(),addPropertyChangeListener(java.beans.PropertyChangeListener)
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getAccessibleDescription
public String getAccessibleDescription()
Gets theaccessibleDescriptionproperty of this object. TheaccessibleDescriptionproperty of this object is a short localized phrase describing the purpose of the object. For example, in the case of a 'Cancel' button, theaccessibleDescriptioncould be 'Ignore changes and close dialog box.'- Returns:
- the localized description of the object;
nullif this object does not have a description - See Also:
setAccessibleDescription(java.lang.String)
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setAccessibleDescription
@BeanProperty(preferred=true, description="Sets the accessible description for the component.") public void setAccessibleDescription(String s)
Sets the accessible description of this object. Changing the name will cause aPropertyChangeEventto be fired for theACCESSIBLE_DESCRIPTION_PROPERTYproperty.- Parameters:
s- the new localized description of the object- See Also:
setAccessibleName(java.lang.String),addPropertyChangeListener(java.beans.PropertyChangeListener)
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getAccessibleRole
public abstract AccessibleRole getAccessibleRole()
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 isAccessibleRole.PUSH_BUTTON. The roles inAccessibleRoleare 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., useAccessibleRole.PUSH_BUTTONfor all components that act like a push button) as well as distinguish between subclasses that behave differently (e.g.,AccessibleRole.CHECK_BOXfor check boxes andAccessibleRole.RADIO_BUTTONfor radio buttons).Note that the
AccessibleRoleclass is also extensible, so custom component developers can define their ownAccessibleRole's if the set of predefined roles is inadequate.- Returns:
- an instance of
AccessibleRoledescribing the role of the object - See Also:
AccessibleRole
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getAccessibleStateSet
public abstract AccessibleStateSet getAccessibleStateSet()
Gets the state set of this object. TheAccessibleStateSetof an object is composed of a set of uniqueAccessibleStates. A change in theAccessibleStateSetof an object will cause aPropertyChangeEventto be fired for theACCESSIBLE_STATE_PROPERTYproperty.- Returns:
- an instance of
AccessibleStateSetcontaining the current state set of the object - See Also:
AccessibleStateSet,AccessibleState,addPropertyChangeListener(java.beans.PropertyChangeListener)
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getAccessibleParent
public Accessible getAccessibleParent()
Gets theAccessibleparent of this object.- Returns:
- the
Accessibleparent of this object;nullif this object does not have anAccessibleparent
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setAccessibleParent
public void setAccessibleParent(Accessible a)
Sets theAccessibleparent 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.- Parameters:
a- -Accessibleto be set as the parent
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getAccessibleIndexInParent
public abstract int getAccessibleIndexInParent()
Gets the 0-based index of this object in its accessible parent.- Returns:
- the 0-based index of this object in its parent; -1 if this object does not have an accessible parent.
- See Also:
getAccessibleParent(),getAccessibleChildrenCount(),getAccessibleChild(int)
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getAccessibleChildrenCount
public abstract int getAccessibleChildrenCount()
Returns the number of accessible children of the object.- Returns:
- the number of accessible children of the object.
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getAccessibleChild
public abstract Accessible getAccessibleChild(int i)
Returns the specifiedAccessiblechild of the object. TheAccessiblechildren of anAccessibleobject are zero-based, so the first child of anAccessiblechild is at index 0, the second child is at index 1, and so on.- Parameters:
i- zero-based index of child- Returns:
- the
Accessiblechild of the object - See Also:
getAccessibleChildrenCount()
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getLocale
public abstract Locale getLocale() throws IllegalComponentStateException
Gets the locale of the component. If the component does not have a locale, then the locale of its parent is returned.- Returns:
- this component's locale. If this component does not have a locale, the locale of its parent is returned.
- Throws:
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
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addPropertyChangeListener
public void addPropertyChangeListener(PropertyChangeListener listener)
Adds aPropertyChangeListenerto the listener list. The listener is registered for allAccessibleproperties and will be called when those properties change.- Parameters:
listener- The PropertyChangeListener to be added- See Also:
ACCESSIBLE_NAME_PROPERTY,ACCESSIBLE_DESCRIPTION_PROPERTY,ACCESSIBLE_STATE_PROPERTY,ACCESSIBLE_VALUE_PROPERTY,ACCESSIBLE_SELECTION_PROPERTY,ACCESSIBLE_TEXT_PROPERTY,ACCESSIBLE_VISIBLE_DATA_PROPERTY
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removePropertyChangeListener
public void removePropertyChangeListener(PropertyChangeListener listener)
Removes aPropertyChangeListenerfrom the listener list. This removes aPropertyChangeListenerthat was registered for all properties.- Parameters:
listener- The PropertyChangeListener to be removed
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getAccessibleAction
public AccessibleAction getAccessibleAction()
Gets theAccessibleActionassociated with this object that supports one or more actions.- Returns:
AccessibleActionif supported by object; else returnnull- See Also:
AccessibleAction
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getAccessibleComponent
public AccessibleComponent getAccessibleComponent()
Gets theAccessibleComponentassociated with this object that has a graphical representation.- Returns:
AccessibleComponentif supported by object; else returnnull- See Also:
AccessibleComponent
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getAccessibleSelection
public AccessibleSelection getAccessibleSelection()
Gets theAccessibleSelectionassociated with this object which allows itsAccessiblechildren to be selected.- Returns:
AccessibleSelectionif supported by object; else returnnull- See Also:
AccessibleSelection
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getAccessibleText
public AccessibleText getAccessibleText()
Gets theAccessibleTextassociated with this object presenting text on the display.- Returns:
AccessibleTextif supported by object; else returnnull- See Also:
AccessibleText
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getAccessibleEditableText
public AccessibleEditableText getAccessibleEditableText()
Gets theAccessibleEditableTextassociated with this object presenting editable text on the display.- Returns:
AccessibleEditableTextif supported by object; else returnnull- Since:
- 1.4
- See Also:
AccessibleEditableText
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getAccessibleValue
public AccessibleValue getAccessibleValue()
Gets theAccessibleValueassociated with this object that supports aNumericalvalue.- Returns:
AccessibleValueif supported by object; else returnnull- See Also:
AccessibleValue
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getAccessibleIcon
public AccessibleIcon[] getAccessibleIcon()
Gets theAccessibleIconsassociated with an object that has one or more associated icons.- Returns:
- an array of
AccessibleIconif supported by object; otherwise returnnull - Since:
- 1.3
- See Also:
AccessibleIcon
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getAccessibleRelationSet
public AccessibleRelationSet getAccessibleRelationSet()
Gets theAccessibleRelationSetassociated with an object.- Returns:
- an
AccessibleRelationSetif supported by object; otherwise returnnull - Since:
- 1.3
- See Also:
AccessibleRelationSet
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getAccessibleTable
public AccessibleTable getAccessibleTable()
Gets theAccessibleTableassociated with an object.- Returns:
- an
AccessibleTableif supported by object; otherwise returnnull - Since:
- 1.3
- See Also:
AccessibleTable
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firePropertyChange
public void firePropertyChange(String propertyName, Object oldValue, Object newValue)
Support for reporting bound property changes. IfoldValueandnewValueare not equal and thePropertyChangeEventlistener list is not empty, then fire aPropertyChangeevent to each listener. In general, this is for use by theAccessibleobjects themselves and should not be called by an application program.- Parameters:
propertyName- The programmatic name of the property that was changedoldValue- The old value of the propertynewValue- The new value of the property- See Also:
PropertyChangeSupport,addPropertyChangeListener(java.beans.PropertyChangeListener),removePropertyChangeListener(java.beans.PropertyChangeListener),ACCESSIBLE_NAME_PROPERTY,ACCESSIBLE_DESCRIPTION_PROPERTY,ACCESSIBLE_STATE_PROPERTY,ACCESSIBLE_VALUE_PROPERTY,ACCESSIBLE_SELECTION_PROPERTY,ACCESSIBLE_TEXT_PROPERTY,ACCESSIBLE_VISIBLE_DATA_PROPERTY
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