Class Component.AccessibleAWTComponent

java.lang.Object

javax.accessibility.AccessibleContext

java.awt.Component.AccessibleAWTComponent

All Implemented Interfaces:: Serializable, AccessibleComponent

Direct Known Subclasses:: Box.Filler.AccessibleBoxFiller, Button.AccessibleAWTButton, Canvas.AccessibleAWTCanvas, Checkbox.AccessibleAWTCheckbox, Choice.AccessibleAWTChoice, Container.AccessibleAWTContainer, Label.AccessibleAWTLabel, List.AccessibleAWTList, List.AccessibleAWTList.AccessibleAWTListChild, Scrollbar.AccessibleAWTScrollBar, TextComponent.AccessibleAWTTextComponent

Enclosing class:: Component

protected abstract class Component.AccessibleAWTComponent extends AccessibleContext implements Serializable, AccessibleComponent

Inner class of Component used to provide default support for accessibility. This class is not meant to be used directly by application developers, but is instead meant only to be subclassed by component developers.

The class used to obtain the accessible role for this object.

Since:

1.3

See Also:

Nested Class Summary

Modifier and Type	Class	Description
`protected class`	`Component.AccessibleAWTComponent.AccessibleAWTComponentHandler`	Fire PropertyChange listener, if one is registered, when shown/hidden..
`protected class`	`Component.AccessibleAWTComponent.AccessibleAWTFocusHandler`	Fire PropertyChange listener, if one is registered, when focus events happen

Field Summary

Modifier and Type	Field	Description
`protected ComponentListener`	`accessibleAWTComponentHandler`	A component listener to track show/hide/resize events and convert them to PropertyChange events.
`protected FocusListener`	`accessibleAWTFocusHandler`	A listener to track focus events and convert them to PropertyChange events.

Fields declared in class AccessibleContext

ACCESSIBLE_ACTION_PROPERTY, ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, ACCESSIBLE_CARET_PROPERTY, ACCESSIBLE_CHILD_PROPERTY, ACCESSIBLE_COMPONENT_BOUNDS_CHANGED, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_HYPERTEXT_OFFSET, ACCESSIBLE_INVALIDATE_CHILDREN, ACCESSIBLE_NAME_PROPERTY, ACCESSIBLE_SELECTION_PROPERTY, ACCESSIBLE_STATE_PROPERTY, ACCESSIBLE_TABLE_CAPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED, ACCESSIBLE_TABLE_MODEL_CHANGED, ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_ROW_HEADER_CHANGED, ACCESSIBLE_TABLE_SUMMARY_CHANGED, ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED, ACCESSIBLE_TEXT_PROPERTY, ACCESSIBLE_VALUE_PROPERTY, ACCESSIBLE_VISIBLE_DATA_PROPERTY, accessibleDescription, accessibleName, accessibleParent

Modifier and Type	Field	Description
`static final String`	`ACCESSIBLE_ACTION_PROPERTY`	Constant used to indicate that the supported set of actions has changed.
`static final String`	`ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY`	Constant used to determine when the active descendant of a component has changed.
`static final String`	`ACCESSIBLE_CARET_PROPERTY`	Constant used to determine when the `accessibleText` caret has changed.
`static final String`	`ACCESSIBLE_CHILD_PROPERTY`	Constant used to determine when `Accessible` children are added/removed from the object.
`static final String`	`ACCESSIBLE_COMPONENT_BOUNDS_CHANGED`	`PropertyChangeEvent` which indicates that a change has occurred in a component's bounds.
`static final String`	`ACCESSIBLE_DESCRIPTION_PROPERTY`	Constant used to determine when the `AccessibleContext.accessibleDescription` property has changed.
`static final String`	`ACCESSIBLE_HYPERTEXT_OFFSET`	Constant used to indicate that a hypertext element has received focus.
`static final String`	`ACCESSIBLE_INVALIDATE_CHILDREN`	`PropertyChangeEvent` which indicates that a significant change has occurred to the children of a component like a tree or text.
`static final String`	`ACCESSIBLE_NAME_PROPERTY`	Constant used to determine when the `AccessibleContext.accessibleName` property has changed.
`static final String`	`ACCESSIBLE_SELECTION_PROPERTY`	Constant used to determine when the `accessibleSelection` has changed.
`static final String`	`ACCESSIBLE_STATE_PROPERTY`	Constant used to determine when the `accessibleStateSet` property has changed.
`static final String`	`ACCESSIBLE_TABLE_CAPTION_CHANGED`	Constant used to indicate that the table caption has changed.
`static final String`	`ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED`	Constant used to indicate that the column description has changed.
`static final String`	`ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED`	Constant used to indicate that the column header has changed.
`static final String`	`ACCESSIBLE_TABLE_MODEL_CHANGED`	Constant used to indicate that table data has changed.
`static final String`	`ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED`	Constant used to indicate that the row description has changed.
`static final String`	`ACCESSIBLE_TABLE_ROW_HEADER_CHANGED`	Constant used to indicate that the row header has changed.
`static final String`	`ACCESSIBLE_TABLE_SUMMARY_CHANGED`	Constant used to indicate that the table summary has changed.
`static final String`	`ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED`	`PropertyChangeEvent` which indicates that text attributes have changed.
`static final String`	`ACCESSIBLE_TEXT_PROPERTY`	`PropertyChangeEvent` which indicates that text has changed.
`static final String`	`ACCESSIBLE_VALUE_PROPERTY`	Constant used to determine when the `accessibleValue` property has changed.
`static final String`	`ACCESSIBLE_VISIBLE_DATA_PROPERTY`	Constant used to determine when the visual appearance of the object has changed.
`protected String`	`accessibleDescription`	A localized String containing the description of the object.
`protected String`	`accessibleName`	A localized String containing the name of the object.
`protected Accessible`	`accessibleParent`	The accessible parent of this object.

Constructor Summary

AccessibleAWTComponent()

Modifier	Constructor	Description
`protected`	Though the class is abstract, this should be called by all sub-classes.

Method Summary

Modifier and Type	Method	Description
`void`	`addFocusListener(FocusListener l)`	Adds the specified focus listener to receive focus events from this component.
`void`	`addPropertyChangeListener(PropertyChangeListener listener)`	Adds a `PropertyChangeListener` to the listener list.
`boolean`	`contains(Point p)`	Checks whether the specified point is within this object's bounds, where the point's x and y coordinates are defined to be relative to the coordinate system of the object.
`Accessible`	`getAccessibleAt(Point p)`	Returns the `Accessible` child, if one exists, contained at the local coordinate `Point`.
`Accessible`	`getAccessibleChild(int i)`	Returns the nth `Accessible` child of the object.
`int`	`getAccessibleChildrenCount()`	Returns the number of accessible children in the object.
`AccessibleComponent`	`getAccessibleComponent()`	Gets the `AccessibleComponent` associated with this object if one exists.
`String`	`getAccessibleDescription()`	Gets the accessible description of this object.
`int`	`getAccessibleIndexInParent()`	Gets the index of this object in its accessible parent.
`String`	`getAccessibleName()`	Gets the accessible name of this object.
`Accessible`	`getAccessibleParent()`	Gets the `Accessible` parent of this object.
`AccessibleRole`	`getAccessibleRole()`	Gets the role of this object.
`AccessibleStateSet`	`getAccessibleStateSet()`	Gets the state of this object.
`Color`	`getBackground()`	Gets the background color of this object.
`Rectangle`	`getBounds()`	Gets the bounds of this object in the form of a Rectangle object.
`Cursor`	`getCursor()`	Gets the `Cursor` of this object.
`Font`	`getFont()`	Gets the `Font` of this object.
`FontMetrics`	`getFontMetrics(Font f)`	Gets the `FontMetrics` of this object.
`Color`	`getForeground()`	Gets the foreground color of this object.
`Locale`	`getLocale()`	Returns the locale of this object.
`Point`	`getLocation()`	Gets the location of the object relative to the parent in the form of a point specifying the object's top-left corner in the screen's coordinate space.
`Point`	`getLocationOnScreen()`	Returns the location of the object on the screen.
`Dimension`	`getSize()`	Returns the size of this object in the form of a `Dimension` object.
`boolean`	`isEnabled()`	Determines if the object is enabled.
`boolean`	`isFocusTraversable()`	Returns whether this object can accept focus or not.
`boolean`	`isShowing()`	Determines if the object is showing.
`boolean`	`isVisible()`	Determines if the object is visible.
`void`	`removeFocusListener(FocusListener l)`	Removes the specified focus listener so it no longer receives focus events from this component.
`void`	`removePropertyChangeListener(PropertyChangeListener listener)`	Remove a PropertyChangeListener from the listener list.
`void`	`requestFocus()`	Requests focus for this object.
`void`	`setBackground(Color c)`	Sets the background color of this object.
`void`	`setBounds(Rectangle r)`	Sets the bounds of this object in the form of a `Rectangle` object.
`void`	`setCursor(Cursor cursor)`	Sets the `Cursor` of this object.
`void`	`setEnabled(boolean b)`	Sets the enabled state of the object.
`void`	`setFont(Font f)`	Sets the `Font` of this object.
`void`	`setForeground(Color c)`	Sets the foreground color of this object.
`void`	`setLocation(Point p)`	Sets the location of the object relative to the parent.
`void`	`setSize(Dimension d)`	Resizes this object so that it has width and height.
`void`	`setVisible(boolean b)`	Sets the visible state of the object.

Methods declared in class AccessibleContext

firePropertyChange, getAccessibleAction, getAccessibleEditableText, getAccessibleIcon, getAccessibleRelationSet, getAccessibleSelection, getAccessibleTable, getAccessibleText, getAccessibleValue, setAccessibleDescription, setAccessibleName, setAccessibleParent

Modifier and Type	Method	Description
`void`	`firePropertyChange(String propertyName, Object oldValue, Object newValue)`	Support for reporting bound property changes.
`AccessibleAction`	`getAccessibleAction()`	Gets the `AccessibleAction` associated with this object that supports one or more actions.
`AccessibleEditableText`	`getAccessibleEditableText()`	Gets the `AccessibleEditableText` associated with this object presenting editable text on the display.
`AccessibleIcon[]`	`getAccessibleIcon()`	Gets the `AccessibleIcons` associated with an object that has one or more associated icons.
`AccessibleRelationSet`	`getAccessibleRelationSet()`	Gets the `AccessibleRelationSet` associated with an object.
`AccessibleSelection`	`getAccessibleSelection()`	Gets the `AccessibleSelection` associated with this object which allows its `Accessible` children to be selected.
`AccessibleTable`	`getAccessibleTable()`	Gets the `AccessibleTable` associated with an object.
`AccessibleText`	`getAccessibleText()`	Gets the `AccessibleText` associated with this object presenting text on the display.
`AccessibleValue`	`getAccessibleValue()`	Gets the `AccessibleValue` associated with this object that supports a `Numerical` value.
`void`	`setAccessibleDescription(String s)`	Sets the accessible description of this object.
`void`	`setAccessibleName(String s)`	Sets the localized accessible name of this object.
`void`	`setAccessibleParent(Accessible a)`	Sets the `Accessible` parent of this object.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Field Details

accessibleAWTComponentHandler

protected ComponentListener accessibleAWTComponentHandler

A component listener to track show/hide/resize events and convert them to PropertyChange events.

accessibleAWTFocusHandler

protected FocusListener accessibleAWTFocusHandler

A listener to track focus events and convert them to PropertyChange events.

Constructor Details

AccessibleAWTComponent

protected AccessibleAWTComponent()

Though the class is abstract, this should be called by all sub-classes.

Method Details

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Adds a PropertyChangeListener to the listener list.

Overrides:

addPropertyChangeListener in class AccessibleContext

Parameters:

listener - the property change listener to be added

See Also:

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Remove a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.

Overrides:: removePropertyChangeListener in class AccessibleContext
Parameters:: listener - The PropertyChangeListener to be removed

getAccessibleName

public String getAccessibleName()

Gets the accessible name of this object. This should almost never return java.awt.Component.getName(), as that generally isn't a localized name, and doesn't have meaning for the user. If the object is fundamentally a text object (e.g. a menu item), the accessible name should be the text of the object (e.g. "save"). If the object has a tooltip, the tooltip text may also be an appropriate String to return.

Overrides:

getAccessibleName in class AccessibleContext

Returns:

the localized name of the object -- can be null if this object does not have a name

See Also:

getAccessibleDescription

public String getAccessibleDescription()

Gets the accessible description of this object. This should be a concise, localized description of what this object is - what is its meaning to the user. If the object has a tooltip, the tooltip text may be an appropriate string to return, assuming it contains a concise description of the object (instead of just the name of the object - e.g. a "Save" icon on a toolbar that had "save" as the tooltip text shouldn't return the tooltip text as the description, but something like "Saves the current text document" instead).

Overrides:

getAccessibleDescription in class AccessibleContext

Returns:

the localized description of the object -- can be null if this object does not have a description

See Also:

getAccessibleRole

public AccessibleRole getAccessibleRole()

Gets the role of this object.

Specified by:

getAccessibleRole in class AccessibleContext

Returns:

an instance of AccessibleRole describing the role of the object

See Also:

getAccessibleStateSet

public AccessibleStateSet getAccessibleStateSet()

Gets the state of this object.

Specified by:

getAccessibleStateSet in class AccessibleContext

Returns:

an instance of AccessibleStateSet containing the current state set of the object

See Also:

getAccessibleParent

public Accessible getAccessibleParent()

Gets the Accessible parent of this object. If the parent of this object implements Accessible, this method should simply return getParent.

Overrides:: getAccessibleParent in class AccessibleContext
Returns:: the Accessible parent of this object -- can be null if this object does not have an Accessible parent

getAccessibleIndexInParent

public int getAccessibleIndexInParent()

Gets the index of this object in its accessible parent.

Specified by:

getAccessibleIndexInParent in class AccessibleContext

Returns:

the index of this object in its parent; or -1 if this object does not have an accessible parent

See Also:

getAccessibleChildrenCount

public int getAccessibleChildrenCount()

Returns the number of accessible children in the object. If all of the children of this object implement Accessible, then this method should return the number of children of this object.

Specified by:: getAccessibleChildrenCount in class AccessibleContext
Returns:: the number of accessible children in the object

getAccessibleChild

public Accessible getAccessibleChild(int i)

Returns the nth Accessible child of the object.

Specified by:

getAccessibleChild in class AccessibleContext

Parameters:

i - zero-based index of child

Returns:

the nth Accessible child of the object

See Also:

getLocale

public Locale getLocale()

Returns the locale of this object.

Specified by:: getLocale in class AccessibleContext
Returns:: the locale of this object

getAccessibleComponent

public AccessibleComponent getAccessibleComponent()

Gets the AccessibleComponent associated with this object if one exists. Otherwise return null.

Overrides:

getAccessibleComponent in class AccessibleContext

Returns:

the component

See Also:

getBackground

public Color getBackground()

Gets the background color of this object.

Specified by:

getBackground in interface AccessibleComponent

Returns:

the background color, if supported, of the object; otherwise, null

See Also:

setBackground

public void setBackground(Color c)

Sets the background color of this object. (For transparency, see isOpaque.)

Specified by:

setBackground in interface AccessibleComponent

Parameters:

c - the new Color for the background

See Also:

getForeground

public Color getForeground()

Gets the foreground color of this object.

Specified by:

getForeground in interface AccessibleComponent

Returns:

the foreground color, if supported, of the object; otherwise, null

See Also:

setForeground

public void setForeground(Color c)

Sets the foreground color of this object.

Specified by:

setForeground in interface AccessibleComponent

Parameters:

c - the new Color for the foreground

See Also:

getCursor

public Cursor getCursor()

Gets the Cursor of this object.

Specified by:

getCursor in interface AccessibleComponent

Returns:

the Cursor, if supported, of the object; otherwise, null

See Also:

setCursor

public void setCursor(Cursor cursor)

Sets the Cursor of this object.

The method may have no visual effect if the Java platform implementation and/or the native system do not support changing the mouse cursor shape.

Specified by:

setCursor in interface AccessibleComponent

Parameters:

cursor - the new Cursor for the object

See Also:

getFont

public Font getFont()

Gets the Font of this object.

Specified by:

getFont in interface AccessibleComponent

Returns:

the Font, if supported, for the object; otherwise, null

See Also:

setFont

public void setFont(Font f)

Sets the Font of this object.

Specified by:

setFont in interface AccessibleComponent

Parameters:

f - the new Font for the object

See Also:

getFontMetrics

public FontMetrics getFontMetrics(Font f)

Gets the FontMetrics of this object.

Specified by:

getFontMetrics in interface AccessibleComponent

Parameters:

f - the Font

Returns:

the FontMetrics, if supported, the object; otherwise, null

See Also:

isEnabled

public boolean isEnabled()

Determines if the object is enabled.

Specified by:

isEnabled in interface AccessibleComponent

Returns:

true if object is enabled; otherwise, false

See Also:

setEnabled

public void setEnabled(boolean b)

Sets the enabled state of the object.

Specified by:

setEnabled in interface AccessibleComponent

Parameters:

b - if true, enables this object; otherwise, disables it

See Also:

isVisible

public boolean isVisible()

Determines if the object is visible. Note: this means that the object intends to be visible; however, it may not in fact be showing on the screen because one of the objects that this object is contained by is not visible. To determine if an object is showing on the screen, use isShowing.

Specified by:

isVisible in interface AccessibleComponent

Returns:

true if object is visible; otherwise, false

See Also:

setVisible

public void setVisible(boolean b)

Sets the visible state of the object.

Specified by:

setVisible in interface AccessibleComponent

Parameters:

b - if true, shows this object; otherwise, hides it

See Also:

isShowing

public boolean isShowing()

Determines if the object is showing. This is determined by checking the visibility of the object and ancestors of the object. Note: this will return true even if the object is obscured by another (for example, it happens to be underneath a menu that was pulled down).

Specified by:: isShowing in interface AccessibleComponent
Returns:: true if object is showing; otherwise, false

contains

public boolean contains(Point p)

Checks whether the specified point is within this object's bounds, where the point's x and y coordinates are defined to be relative to the coordinate system of the object.

Specified by:

contains in interface AccessibleComponent

Parameters:

p - the Point relative to the coordinate system of the object

Returns:

true if object contains Point; otherwise false

See Also:

getLocationOnScreen

public Point getLocationOnScreen()

Returns the location of the object on the screen.

Specified by:

getLocationOnScreen in interface AccessibleComponent

Returns:

location of object on screen -- can be null if this object is not on the screen

See Also:

getLocation

public Point getLocation()

Gets the location of the object relative to the parent in the form of a point specifying the object's top-left corner in the screen's coordinate space.

Specified by:

getLocation in interface AccessibleComponent

Returns:

an instance of Point representing the top-left corner of the object's bounds in the coordinate space of the screen; null if this object or its parent are not on the screen

See Also:

setLocation

public void setLocation(Point p)

Sets the location of the object relative to the parent.

Specified by:

setLocation in interface AccessibleComponent

Parameters:

p - the coordinates of the object

See Also:

getBounds

public Rectangle getBounds()

Gets the bounds of this object in the form of a Rectangle object. The bounds specify this object's width, height, and location relative to its parent.

Specified by:

getBounds in interface AccessibleComponent

Returns:

a rectangle indicating this component's bounds; null if this object is not on the screen

See Also:

setBounds

public void setBounds(Rectangle r)

Sets the bounds of this object in the form of a Rectangle object. The bounds specify this object's width, height, and location relative to its parent.

Specified by:

setBounds in interface AccessibleComponent

Parameters:

r - a rectangle indicating this component's bounds

See Also:

getSize

public Dimension getSize()

Returns the size of this object in the form of a Dimension object. The height field of the Dimension object contains this object's height, and the width field of the Dimension object contains this object's width.

Specified by:

getSize in interface AccessibleComponent

Returns:

a Dimension object that indicates the size of this component; null if this object is not on the screen

See Also:

setSize

public void setSize(Dimension d)

Resizes this object so that it has width and height.

Specified by:

setSize in interface AccessibleComponent

Parameters:

d - the dimension specifying the new size of the object

See Also:

getAccessibleAt

public Accessible getAccessibleAt(Point p)

Returns the Accessible child, if one exists, contained at the local coordinate Point. Otherwise returns null.

Specified by:: getAccessibleAt in interface AccessibleComponent
Parameters:: p - the point defining the top-left corner of the Accessible, given in the coordinate space of the object's parent
Returns:: the Accessible, if it exists, at the specified location; else null

isFocusTraversable

public boolean isFocusTraversable()

Returns whether this object can accept focus or not.

Specified by:

isFocusTraversable in interface AccessibleComponent

Returns:

true if object can accept focus; otherwise false

See Also:

requestFocus

public void requestFocus()

Requests focus for this object.

Specified by:

requestFocus in interface AccessibleComponent

See Also:

addFocusListener

public void addFocusListener(FocusListener l)

Adds the specified focus listener to receive focus events from this component.

Specified by:

addFocusListener in interface AccessibleComponent

Parameters:

l - the focus listener

See Also:

removeFocusListener

public void removeFocusListener(FocusListener l)

Removes the specified focus listener so it no longer receives focus events from this component.

Specified by:

removeFocusListener in interface AccessibleComponent

Parameters:

l - the focus listener

See Also:

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