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Interface java.awt.accessibility.AccessibleComponent

Implementing Classes:
JFrame.AccessibleJFrame, Box.Filler.AccessibleBoxFiller, Box.AccessibleBox, JComponent.AccessibleJComponent, JWindow.AccessibleJWindow, JTable.AccessibleJTable.AccessibleJTableCell, JDialog.AccessibleJDialog, JList.AccessibleJList.AccessibleJListChild, JApplet.AccessibleJApplet, JPopupMenu.WindowPopup.AccessibleWindowPopup, JTree.AccessibleJTree.AccessibleJTreeNode, JComboBox.AccessibleJComboBox.AccessibleJComboBoxList, CellRendererPane.AccessibleCellRendererPane, 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 (see Accessible) and then calling the getAccessibleComponent method of AccessibleContext. If the return value is not null, the object supports this interface.

See Also:
Accessible, getAccessibleContext, 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()
Get the background color of this object.
Rectangle  getBounds()
Gets the bounds of this object in the form of a Rectangle object.
Cursor  getCursor()
Get the Cursor of this object.
Font  getFont()
Get the Font of this object.
FontMetrics  getFontMetrics(Font f)
Get the FontMetrics of this object.
Color  getForeground()
Get 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()
Determine if the object is enabled.
boolean  isFocusTraversable()
Returns whether this object can accept focus or not.
boolean  isShowing()
Determine if the object is showing.
boolean  isVisible()
Determine 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)
Set 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)
Set the Cursor of this object.
void  setEnabled(boolean b)
Set the enabled state of the object.
void  setFont(Font f)
Set the Font of this object.
void  setForeground(Color c)
Set 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)
Set the visible state of the object.
 

Method Detail

getBackground

public Color getBackground()
Get the background color of this object.
Returns:
the background color, if supported, of the object; otherwise, null
See Also:
setBackground

setBackground

public void setBackground(Color c)
Set the background color of this object.
Parameters:
c - the new Color for the background
See Also:
setBackground

getForeground

public Color getForeground()
Get the foreground color of this object.
Returns:
the foreground color, if supported, of the object; otherwise, null
See Also:
setForeground

setForeground

public void setForeground(Color c)
Set the foreground color of this object.
Parameters:
c - the new Color for the foreground
See Also:
getForeground

getCursor

public Cursor getCursor()
Get the Cursor of this object.
Returns:
the Cursor, if supported, of the object; otherwise, null
See Also:
setCursor

setCursor

public void setCursor(Cursor cursor)
Set the Cursor of this object.
Parameters:
c - the new Cursor for the object
See Also:
getCursor

getFont

public Font getFont()
Get the Font of this object.
Returns:
the Font,if supported, for the object; otherwise, null
See Also:
setFont

setFont

public void setFont(Font f)
Set the Font of this object.
Parameters:
f - the new Font for the object
See Also:
getFont

getFontMetrics

public FontMetrics getFontMetrics(Font f)
Get 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()
Determine if the object is enabled. Objects that are enabled will also have the AccessibleState.ENABLED state set in their AccessibleStateSet.
Returns:
true if object is enabled; otherwise, false
See Also:
setEnabled, getAccessibleStateSet, ENABLED, AccessibleStateSet

setEnabled

public void setEnabled(boolean b)
Set the enabled state of the object.
Parameters:
b - if true, enables this object; otherwise, disables it
See Also:
isEnabled

isVisible

public boolean isVisible()
Determine 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 AccessibleStateSet.

Returns:
true if object is visible; otherwise, false
See Also:
setVisible, getAccessibleStateSet, VISIBLE, AccessibleStateSet

setVisible

public void setVisible(boolean b)
Set the visible state of the object.
Parameters:
b - if true, shows this object; otherwise, hides it
See Also:
isVisible

isShowing

public boolean isShowing()
Determine if the object is showing. This is determined by checking the visibility of the object and visibility of the object ancestors. Note: this will return true even if the object is obscured by another (for example, it to object 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:
location of 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 objects'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

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 objects'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

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 AccessibleStateSet.
Returns:
true if object can accept focus; otherwise false
See Also:
getAccessibleStateSet, FOCUSABLE, 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

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

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