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

All Methods Instance Methods Concrete Methods
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 Detail

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 Detail

AccessibleAWTComponent

protected AccessibleAWTComponent()

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

Method Detail

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)