Module java.desktop

Package java.awt

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:

Serialized Form

Nested Class Summary

Nested Classes

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

Fields

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 javax.accessibility.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

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AccessibleAWTComponent()	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 javax.accessibility.AccessibleContext

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

Methods declared in class java.lang.Object

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

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:

AccessibleContext.ACCESSIBLE_NAME_PROPERTY, AccessibleContext.ACCESSIBLE_DESCRIPTION_PROPERTY, AccessibleContext.ACCESSIBLE_STATE_PROPERTY, AccessibleContext.ACCESSIBLE_VALUE_PROPERTY, AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY, AccessibleContext.ACCESSIBLE_TEXT_PROPERTY, AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY

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:

AccessibleContext.setAccessibleName(java.lang.String)

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:

AccessibleContext.setAccessibleDescription(java.lang.String)

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:

AccessibleRole

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:

AccessibleState

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:

getAccessibleParent()

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:

AccessibleContext.getAccessibleChildrenCount()

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:

AccessibleComponent

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:

AccessibleComponent.setBackground(java.awt.Color)

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:

Component.isOpaque()

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:

AccessibleComponent.setForeground(java.awt.Color)

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:

AccessibleComponent.getForeground()

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:

AccessibleComponent.setCursor(java.awt.Cursor)

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:

AccessibleComponent.getCursor()

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:

AccessibleComponent.setFont(java.awt.Font)

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:

AccessibleComponent.getFont()

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:

getFont()

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:

AccessibleComponent.setEnabled(boolean), AccessibleContext.getAccessibleStateSet(), AccessibleState.ENABLED, AccessibleStateSet

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:

AccessibleComponent.isEnabled()

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:

AccessibleComponent.setVisible(boolean), AccessibleContext.getAccessibleStateSet(), AccessibleState.VISIBLE, AccessibleStateSet

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:

AccessibleComponent.isVisible()

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:

AccessibleComponent.getBounds()

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:

AccessibleComponent.getBounds(), AccessibleComponent.getLocation()

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:

AccessibleComponent.getBounds(), AccessibleComponent.getLocationOnScreen()

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:

AccessibleComponent.getLocation()

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:

AccessibleComponent.contains(java.awt.Point)

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:

AccessibleComponent.getBounds()

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:

AccessibleComponent.setSize(java.awt.Dimension)

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:

AccessibleComponent.getSize()

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:

AccessibleContext.getAccessibleStateSet(), AccessibleState.FOCUSABLE, AccessibleState.FOCUSED, AccessibleStateSet

requestFocus

public void requestFocus()

Requests focus for this object.

Specified by:

requestFocus in interface AccessibleComponent

See Also:

AccessibleComponent.isFocusTraversable()

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:

AccessibleComponent.removeFocusListener(java.awt.event.FocusListener)

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:

AccessibleComponent.addFocusListener(java.awt.event.FocusListener)