javax.accessibility
Interface AccessibleComponent

All Known Implementing Classes:

Component.AccessibleAWTComponent, MenuComponent.AccessibleAWTMenuComponent, JList.AccessibleJList.AccessibleJListChild, JTree.AccessibleJTree.AccessibleJTreeNode, JTable.AccessibleJTable.AccessibleJTableCell, JTableHeader.AccessibleJTableHeader.AccessibleJTableHeaderEntry

public interface AccessibleComponent

The AccessibleComponent interface should be supported by any object that is rendered on the screen. This interface provides the standard mechanism for an assistive technology to determine and set the graphical representation of an object. Applications can determine if an object supports the AccessibleComponent interface by first obtaining its AccessibleContext and then calling the AccessibleContext.getAccessibleComponent() method. If the return value is not null, the object supports this interface.

See Also:

Accessible, Accessible.getAccessibleContext(), AccessibleContext, AccessibleContext.getAccessibleComponent()

Method Summary

void	addFocusListener(FocusListener l) Adds the specified focus listener to receive focus events from this component.
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.
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.
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	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.

Method Detail

getBackground

public Color getBackground()

Gets the background color of this object.

Returns:

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

See Also:

setBackground(java.awt.Color)

setBackground

public void setBackground(Color c)

Sets the background color of this object.

Parameters:

c - the new Color for the background

See Also:

setBackground(java.awt.Color)

getForeground

public Color getForeground()

Gets the foreground color of this object.

Returns:

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

See Also:

setForeground(java.awt.Color)

setForeground

public void setForeground(Color c)

Sets the foreground color of this object.

Parameters:

c - the new Color for the foreground

See Also:

getForeground()

getCursor

public Cursor getCursor()

Gets the Cursor of this object.

Returns:

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

See Also:

setCursor(java.awt.Cursor)

setCursor

public void setCursor(Cursor cursor)

Sets the Cursor of this object.

Parameters:

c - the new Cursor for the object

See Also:

getCursor()

getFont

public Font getFont()

Gets the Font of this object.

Returns:

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

See Also:

setFont(java.awt.Font)

setFont

public void setFont(Font f)

Sets the Font of this object.

Parameters:

f - the new Font for the object

See Also:

getFont()

getFontMetrics

public FontMetrics getFontMetrics(Font f)

Gets the FontMetrics of this object.

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. Objects that are enabled will also have the AccessibleState.ENABLED state set in their AccessibleStateSets.

Returns:

true if object is enabled; otherwise, false

See Also:

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

setEnabled

public void setEnabled(boolean b)

Sets the enabled state of the object.

Parameters:

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

See Also:

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 be showing on the screen because one of the objects that this object is contained by is currently not visible. To determine if an object is showing on the screen, use isShowing().

Objects that are visible will also have the AccessibleState.VISIBLE state set in their AccessibleStateSets.

Returns:

true if object is visible; otherwise, false

See Also:

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

setVisible

public void setVisible(boolean b)

Sets the visible state of the object.

Parameters:

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

See Also:

isVisible()

isShowing

public boolean isShowing()

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

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.

Parameters:

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

Returns:

true if object contains Point; otherwise false

See Also:

getBounds()

getLocationOnScreen

public Point getLocationOnScreen()

Returns the location of the object on the screen.

Returns:

the location of the object on screen; null if this object is not on the screen

See Also:

getBounds(), 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.

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:

getBounds(), getLocationOnScreen()

setLocation

public void setLocation(Point p)

Sets the location of the object relative to the parent.

Parameters:

p - the new position for the top-left corner

See Also:

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.

Returns:

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

See Also:

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.

Parameters:

r - rectangle indicating this component's bounds

See Also:

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.

Returns:

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

See Also:

setSize(java.awt.Dimension)

setSize

public void setSize(Dimension d)

Resizes this object so that it has width and height.

Parameters:

d - The dimension specifying the new size of the object.

See Also:

getSize()

getAccessibleAt

public Accessible getAccessibleAt(Point p)

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

Parameters:

p - The point relative to the coordinate system of this object.

Returns:

the Accessible, if it exists, at the specified location; otherwise null

isFocusTraversable

public boolean isFocusTraversable()

Returns whether this object can accept focus or not. Objects that can accept focus will also have the AccessibleState.FOCUSABLE state set in their AccessibleStateSets.

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. If this object cannot accept focus, nothing will happen. Otherwise, the object will attempt to take focus.

See Also:

isFocusTraversable()

addFocusListener

public void addFocusListener(FocusListener l)

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

Parameters:

l - the focus listener

See Also:

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.

Parameters:

l - the focus listener

See Also:

addFocusListener(java.awt.event.FocusListener)