AccessibleComponent
| javax.accessibility.AccessibleComponent |
Class Overview
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
getAccessibleComponent() method.
If the return value is not null, the object supports this interface.
Summary
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Adds the specified focus listener to receive focus events from this
component.
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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.
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Returns the Accessible child, if one exists, contained at the local
coordinate Point.
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Gets the background color of this object.
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Gets the bounds of this object in the form of a Rectangle object.
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Gets the Cursor of this object.
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Gets the Font of this object.
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Gets the FontMetrics of this object.
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Gets the foreground color of this object.
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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.
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Returns the location of the object on the screen.
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Returns the size of this object in the form of a Dimension object.
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Determines if the object is enabled.
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Returns whether this object can accept focus or not.
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Determines if the object is showing.
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Determines if the object is visible.
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Removes the specified focus listener so it no longer receives focus
events from this component.
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Requests focus for this object.
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Sets the background color of this object.
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Sets the bounds of this object in the form of a Rectangle object.
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Sets the Cursor of this object.
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Sets the enabled state of the object.
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Sets the Font of this object.
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Sets the foreground color of this object.
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Sets the location of the object relative to the parent.
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Resizes this object so that it has width and height.
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Sets the visible state of the object.
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Public Methods
public abstract void addFocusListener (FocusListener l)
Adds the specified focus listener to receive focus events from this component.
Parameters
| l | the focus listener |
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See Also
public abstract 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 |
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Returns
- true if object contains Point; otherwise false
See Also
public abstract 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. |
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Returns
- the Accessible, if it exists, at the specified location; otherwise null
public abstract Color getBackground ()
Gets the background color of this object.
Returns
- the background color, if supported, of the object; otherwise, null
See Also
public abstract 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
public abstract Cursor getCursor ()
Gets the Cursor of this object.
Returns
- the Cursor, if supported, of the object; otherwise, null
See Also
public abstract Font getFont ()
Gets the Font of this object.
Returns
- the Font,if supported, for the object; otherwise, null
See Also
public abstract FontMetrics getFontMetrics (Font f)
Gets the FontMetrics of this object.
Parameters
| f | the Font |
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Returns
- the FontMetrics, if supported, the object; otherwise, null
See Also
public abstract Color getForeground ()
Gets the foreground color of this object.
Returns
- the foreground color, if supported, of the object; otherwise, null
See Also
public abstract 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
public abstract 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
public abstract 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
public abstract 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
public abstract 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
public abstract 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
public abstract 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
public abstract void removeFocusListener (FocusListener l)
Removes the specified focus listener so it no longer receives focus events from this component.
Parameters
| l | the focus listener |
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See Also
public abstract 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
public abstract void setBackground (Color c)
Sets the background color of this object.
Parameters
| c | the new Color for the background |
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See Also
public abstract 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 |
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See Also
public abstract void setCursor (Cursor cursor)
Sets the Cursor of this object.
Parameters
| cursor | the new Cursor for the object |
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See Also
public abstract void setEnabled (boolean b)
Sets the enabled state of the object.
Parameters
| b | if true, enables this object; otherwise, disables it |
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See Also
public abstract void setFont (Font f)
public abstract void setForeground (Color c)
Sets the foreground color of this object.
Parameters
| c | the new Color for the foreground |
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See Also
public abstract void setLocation (Point p)
Sets the location of the object relative to the parent.
Parameters
| p | the new position for the top-left corner |
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See Also
public abstract 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. |
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See Also
public abstract void setVisible (boolean b)
Sets the visible state of the object.
Parameters
| b | if true, shows this object; otherwise, hides it |
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