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Box.java
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/*
* @(#)Box.java 1.24 98/02/02
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeListener;
import java.util.Locale;
import java.io.Serializable;
import com.sun.java.accessibility.*;
/**
* A lightweight container
* that uses a BoxLayout object as its layout manager.
* Box provides several class methods
* that are useful for containers using BoxLayout --
* even non-Box containers.
*
* <p>
*
* The Box class can create several kinds
* of invisible components
* that affect layout:
* glue, struts, and rigid areas.
* If all the components your Box contains
* have a fixed size,
* you might want to use a glue component
* (returned by <code>createGlue</code>)
* to control the components' positions.
* If you need a fixed amount of space between two components,
* try using a strut
* (<code>createHorizontalStrut</code> or <code>createVerticalStrut</code>).
* If you need an invisible component
* that always takes up the same amount of space,
* get it by invoking <code>createRigidArea</code>.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @see BoxLayout
*
* @author Timothy Prinzing
* @version 1.24 02/02/98
*/
public class Box extends Container implements Accessible {
/**
* Creates a <code>Box</code> that displays its components
* along the the specified axis.
*
* @param axis can be either <code>BoxLayout.X_AXIS</code>
* (to display components from left to right) or
* <code>BoxLayout.Y_AXIS</code>
* (to display them from top to bottom)
* @see #createHorizontalBox
* @see #createVerticalBox
*/
public Box(int axis) {
super();
setName(base + nameCounter++);
super.setLayout(new BoxLayout(this, axis));
}
/**
* Creates a <code>Box</code> that displays its components
* from left to right.
*/
public static Box createHorizontalBox() {
return new Box(BoxLayout.X_AXIS);
}
/**
* Creates a <code>Box</code> that displays its components
* from top to bottom.
*/
public static Box createVerticalBox() {
return new Box(BoxLayout.Y_AXIS);
}
/**
* Creates an invisible component that's always the specified size.
* <!-- WHEN WOULD YOU USE THIS AS OPPOSED TO A STRUT? -->
*
* @param d the dimensions of the invisible component
*
* @see #createGlue
* @see #createHorizontalStrut
* @see #createVerticalStrut
*/
public static Component createRigidArea(Dimension d) {
return new Filler(d, d, d);
}
/**
* Creates an invisible, fixed-width component.
* In a horizontal box,
* you typically use this method
* to force a certain amount of space between two components.
* In a vertical box,
* you might use this method
* to force the box to be at least the specified width.
* The invisible component has no height
* unless excess space is available,
* in which case it takes its share of available space,
* just like any other component that has no maximum height.
*
* @param width the width of the invisible component, in pixels
*
* @see #createVerticalStrut
* @see #createGlue
* @see #createRigidArea
*/
public static Component createHorizontalStrut(int width) {
// PENDING(jeff) change to Integer.MAX_VALUE. This hasn't been done
// to date because BoxLayout alignment breaks.
return new Filler(new Dimension(width,0), new Dimension(width,0),
new Dimension(width, Short.MAX_VALUE));
}
/**
* Creates an invisible, fixed-height component.
* In a vertical box,
* you typically use this method
* to force a certain amount of space between two components.
* In a horizontal box,
* you might use this method
* to force the box to be at least the specified height.
* The invisible component has no width
* unless excess space is available,
* in which case it takes its share of available space,
* just like any other component that has no maximum width.
*
* @param height the height of the invisible component, in pixels
*
* @see #createHorizontalStrut
* @see #createGlue
* @see #createRigidArea
*/
public static Component createVerticalStrut(int height) {
// PENDING(jeff) change to Integer.MAX_VALUE. This hasn't been done
// to date because BoxLayout alignment breaks.
return new Filler(new Dimension(0,height), new Dimension(0,height),
new Dimension(Short.MAX_VALUE, height));
}
/**
* Creates an invisible "glue" component
* that can be useful in a Box
* whose visible components have a maximum width
* (for a horizontal box)
* or height (for a vertical box).
* You can think of the glue component
* as being a gooey substance
* that expands as much as necessary
* to fill the space between its neighboring components.
*
* <p>
*
* For example, suppose you have
* a horizontal box that contains two fixed-size components.
* If the box gets extra space,
* the fixed-size components won't become larger,
* so where does the extra space go?
* Without glue,
* the extra space goes to the right of the second component.
* If you put glue between the fixed-size components,
* then the extra space goes there.
* If you put glue before the first fixed-size component,
* the extra space goes there,
* and the fixed-size components are shoved against the right
* edge of the box.
* If you put glue before the first fixed-size component
* and after the second fixed-size component,
* the fixed-size components are centered in the box.
*
* <p>
*
* To use glue,
* call <code>Box.createGlue</code>
* and add the returned component to a container.
* The glue component has no minimum or preferred size,
* so it takes no space unless excess space is available.
* If excess space is available,
* then the glue component takes its share of available
* horizontal or vertical space,
* just like any other component that has no maximum width or height.
*/
public static Component createGlue() {
// PENDING(jeff) change to Integer.MAX_VALUE. This hasn't been done
// to date because BoxLayout alignment breaks.
return new Filler(new Dimension(0,0), new Dimension(0,0),
new Dimension(Short.MAX_VALUE, Short.MAX_VALUE));
}
public static Component createHorizontalGlue() {
// PENDING(jeff) change to Integer.MAX_VALUE. This hasn't been done
// to date because BoxLayout alignment breaks.
return new Filler(new Dimension(0,0), new Dimension(0,0),
new Dimension(Short.MAX_VALUE, 0));
}
public static Component createVerticalGlue() {
// PENDING(jeff) change to Integer.MAX_VALUE. This hasn't been done
// to date because BoxLayout alignment breaks.
return new Filler(new Dimension(0,0), new Dimension(0,0),
new Dimension(0, Short.MAX_VALUE));
}
/**
* Throws an AWTError, since a Box can use only a BoxLayout.
*/
public void setLayout(LayoutManager l) {
throw new AWTError("Illegal request");
}
private static final String base = "box";
private static int nameCounter = 0;
/**
* An implementation of a lightweight component that participates in
* layout but has no view.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*/
public static class Filler extends Component {
/**
* Constructor to create shape with the given size ranges.
*
* @param min Minimum size
* @param pref Preferred size
* @param max Maximum size
*/
public Filler(Dimension min, Dimension pref, Dimension max) {
reqMin = min;
reqPref = pref;
reqMax = max;
}
/**
* Change the size requests for this shape. An invalidate() is
* propagated upward as a result so that layout will eventually
* happen with using the new sizes.
*
* @param min Value to return for getMinimumSize
* @param pref Value to return for getPreferredSize
* @param max Value to return for getMaximumSize
*/
public void changeShape(Dimension min, Dimension pref, Dimension max) {
reqMin = min;
reqPref = pref;
reqMax = max;
invalidate();
}
// ---- Component methods ------------------------------------------
public Dimension getMinimumSize() {
return reqMin;
}
public Dimension getPreferredSize() {
return reqPref;
}
public Dimension getMaximumSize() {
return reqMax;
}
// ---- member variables ---------------------------------------
private Dimension reqMin;
private Dimension reqPref;
private Dimension reqMax;
/////////////////
// Accessibility support for Box$Filler
////////////////
protected AccessibleContext accessibleContext = null;
/**
* Get the AccessibleContext associated with this Component
*
* @return the AccessibleContext of this Component
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleBoxFiller();
}
return accessibleContext;
}
protected class AccessibleBoxFiller extends AccessibleContext
implements Serializable, AccessibleComponent {
// AccessibleContext methods
//
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of
* the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.FILLER;
}
/**
* Get the state of this object.
*
* @return an instance of AccessibleStateSet containing the current
* state set of the object
* @see AccessibleState
*/
public AccessibleStateSet getAccessibleStateSet() {
return SwingUtilities.getAccessibleStateSet(Filler.this);
}
/**
* Get the Accessible parent of this object. If the parent of this
* object implements Accessible, this method should simply return
* getParent().
*
* @return the Accessible parent of this object -- can be null if this
* object does not have an Accessible parent
*/
public Accessible getAccessibleParent() {
Container parent = getParent();
if (parent instanceof Accessible) {
return (Accessible) parent;
} else {
return null;
}
}
/**
* Get the index of this object in its accessible parent.
*
* @return the index of this object in its parent; -1 if this
* object does not have an accessible parent.
* @see #getAccessibleParent
*/
public int getAccessibleIndexInParent() {
return SwingUtilities.getAccessibleIndexInParent(Filler.this);
}
/**
* Returns the number of accessible children in the object. If all
* of the children of this object implement Accessible, than this
* method should return the number of children of this object.
*
* @return the number of accessible children in the object.
*/
public int getAccessibleChildrenCount() {
return SwingUtilities.getAccessibleChildrenCount(Filler.this);
}
/**
* Return the nth Accessible child of the object.
*
* @param i zero-based index of child
* @return the nth Accessible child of the object
*/
public Accessible getAccessibleChild(int i) {
return SwingUtilities.getAccessibleChild(Filler.this,i);
}
/**
* Return the locale of this object.
*
* @return the locale of this object
*/
public Locale getLocale() {
return Filler.this.getLocale();
}
/**
* Get the AccessibleComponent associated with this object if one
* exists. Otherwise return null.
*/
public AccessibleComponent getAccessibleComponent() {
return this;
}
// AccessibleComponent methods
//
/**
* Get the background color of this object.
*
* @return the background color, if supported, of the object;
* otherwise, null
*/
public Color getBackground() {
return Filler.this.getBackground();
}
/**
* Set the background color of this object.
*
* @param c the new Color for the background
*/
public void setBackground(Color c) {
Filler.this.setBackground(c);
}
/**
* Get the foreground color of this object.
*
* @return the foreground color, if supported, of the object;
* otherwise, null
*/
public Color getForeground() {
return Filler.this.getForeground();
}
/**
* Set the foreground color of this object.
*
* @param c the new Color for the foreground
*/
public void setForeground(Color c) {
Filler.this.setForeground(c);
}
/**
* Get the Cursor of this object.
*
* @return the Cursor, if supported, of the object; otherwise, null
*/
public Cursor getCursor() {
return Filler.this.getCursor();
}
/**
* Set the Cursor of this object.
*
* @param c the new Cursor for the object
*/
public void setCursor(Cursor cursor) {
Filler.this.setCursor(cursor);
}
/**
* Get the Font of this object.
*
* @return the Font,if supported, for the object; otherwise, null
*/
public Font getFont() {
return Filler.this.getFont();
}
/**
* Set the Font of this object.
*
* @param f the new Font for the object
*/
public void setFont(Font f) {
Filler.this.setFont(f);
}
/**
* Get the FontMetrics of this object.
*
* @param f the Font
* @return the FontMetrics, if supported, the object; otherwise, null
* @see getFont
*/
public FontMetrics getFontMetrics(Font f) {
return Filler.this.getFontMetrics(f);
}
/**
* Determine if the object is enabled.
*
* @return true if object is enabled; otherwise, false
*/
public boolean isEnabled() {
return Filler.this.isEnabled();
}
/**
* Set the enabled state of the object.
*
* @param b if true, enables this object; otherwise, disables it
*/
public void setEnabled(boolean b) {
Filler.this.setEnabled(b);
}
/**
* Determine 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().
*
* @return true if object is visible; otherwise, false
*/
public boolean isVisible() {
return Filler.this.isVisible();
}
/**
* Set the visible state of the object.
*
* @param b if true, shows this object; otherwise, hides it
*/
public void setVisible(boolean b) {
Filler.this.setVisible(b);
}
/**
* Determine 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).
*
* @return true if object is showing; otherwise, false
*/
public boolean isShowing() {
return Filler.this.isShowing();
}
/**
* 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.
*
* @param p the Point relative to the coordinate system of the object
* @return true if object contains Point; otherwise false
*/
public boolean contains(Point p) {
return Filler.this.contains(p);
}
/**
* Returns the location of the object on the screen.
*
* @return location of object on screen -- can be null if this object
* is not on the screen
*/
public Point getLocationOnScreen() {
return Filler.this.getLocationOnScreen();
}
/**
* 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.
*
* @return 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
*/
public Point getLocation() {
return Filler.this.getLocation();
}
/**
* Sets the location of the object relative to the parent.
*/
public void setLocation(Point p) {
Filler.this.setLocation(p);
}
/**
* 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.
*
* @return A rectangle indicating this component's bounds; null if
* this object is not on the screen.
*/
public Rectangle getBounds() {
return Filler.this.getBounds();
}
/**
* 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.
*
* @param A rectangle indicating this component's bounds
*/
public void setBounds(Rectangle r) {
Filler.this.setBounds(r);
}
/**
* 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.
*
* @return A Dimension object that indicates the size of this
* component; null if this object is not on the screen
*/
public Dimension getSize() {
return Filler.this.getSize();
}
/**
* Resizes this object so that it has width width and height.
*
* @param d - The dimension specifying the new size of the object.
*/
public void setSize(Dimension d) {
Filler.this.setSize(d);
}
/**
* Returns the Accessible child, if one exists, contained at the local
* coordinate Point.
*
* @param p The point defining the top-left corner of the Accessible,
* given in the coordinate space of the object's parent.
* @return the Accessible, if it exists, at the specified location;
* else null
*/
public Accessible getAccessibleAt(Point p) {
return SwingUtilities.getAccessibleAt(Filler.this,p);
}
/**
* Returns whether this object can accept focus or not.
*
* @return true if object can accept focus; otherwise false
*/
public boolean isFocusTraversable() {
return Filler.this.isFocusTraversable();
}
/**
* Requests focus for this object.
*/
public void requestFocus() {
Filler.this.requestFocus();
}
/**
* Adds the specified focus listener to receive focus events from this
* component.
*
* @param l the focus listener
*/
public void addFocusListener(FocusListener l) {
Filler.this.addFocusListener(l);
}
/**
* Removes the specified focus listener so it no longer receives focus
* events from this component.
*
* @param l the focus listener
*/
public void removeFocusListener(FocusListener l) {
Filler.this.removeFocusListener(l);
}
}
}
/////////////////
// Accessibility support for Box
////////////////
protected AccessibleContext accessibleContext = null;
/**
* Get the AccessibleContext associated with this JComponent
*
* @return the AccessibleContext of this JComponent
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleBox();
}
return accessibleContext;
}
protected class AccessibleBox extends AccessibleContext
implements Serializable, AccessibleComponent {
// AccessibleContext methods
//
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.FILLER;
}
/**
* Get the state of this object.
*
* @return an instance of AccessibleStateSet containing the current
* state set of the object
* @see AccessibleState
*/
public AccessibleStateSet getAccessibleStateSet() {
return SwingUtilities.getAccessibleStateSet(Box.this);
}
/**
* Get the Accessible parent of this object. If the parent of this
* object implements Accessible, this method should simply return
* getParent().
*
* @return the Accessible parent of this object -- can be null if this
* object does not have an Accessible parent
*/
public Accessible getAccessibleParent() {
Container parent = getParent();
if (parent instanceof Accessible) {
return (Accessible) parent;
} else {
return null;
}
}
/**
* Get the index of this object in its accessible parent.
*
* @return the index of this object in its parent; -1 if this
* object does not have an accessible parent.
* @see #getAccessibleParent
*/
public int getAccessibleIndexInParent() {
return SwingUtilities.getAccessibleIndexInParent(Box.this);
}
/**
* Returns the number of accessible children in the object. If all
* of the children of this object implement Accessible, than this
* method should return the number of children of this object.
*
* @return the number of accessible children in the object.
*/
public int getAccessibleChildrenCount() {
return SwingUtilities.getAccessibleChildrenCount(Box.this);
}
/**
* Return the nth Accessible child of the object.
*
* @param i zero-based index of child
* @return the nth Accessible child of the object
*/
public Accessible getAccessibleChild(int i) {
return SwingUtilities.getAccessibleChild(Box.this,i);
}
/**
* Return the locale of this object.
*
* @return the locale of this object
*/
public Locale getLocale() {
return Box.this.getLocale();
}
/**
* Get the AccessibleComponent associated with this object if one
* exists. Otherwise return null.
*/
public AccessibleComponent getAccessibleComponent() {
return this;
}
// AccessibleComponent methods
//
/**
* Get the background color of this object.
*
* @return the background color, if supported, of the object;
* otherwise, null
*/
public Color getBackground() {
return Box.this.getBackground();
}
/**
* Set the background color of this object.
*
* @param c the new Color for the background
*/
public void setBackground(Color c) {
Box.this.setBackground(c);
}
/**
* Get the foreground color of this object.
*
* @return the foreground color, if supported, of the object;
* otherwise, null
*/
public Color getForeground() {
return Box.this.getForeground();
}
/**
* Set the foreground color of this object.
*
* @param c the new Color for the foreground
*/
public void setForeground(Color c) {
Box.this.setForeground(c);
}
/**
* Get the Cursor of this object.
*
* @return the Cursor, if supported, of the object; otherwise, null
*/
public Cursor getCursor() {
return Box.this.getCursor();
}
/**
* Set the Cursor of this object.
*
* @param c the new Cursor for the object
*/
public void setCursor(Cursor cursor) {
Box.this.setCursor(cursor);
}
/**
* Get the Font of this object.
*
* @return the Font,if supported, for the object; otherwise, null
*/
public Font getFont() {
return Box.this.getFont();
}
/**
* Set the Font of this object.
*
* @param f the new Font for the object
*/
public void setFont(Font f) {
Box.this.setFont(f);
}
/**
* Get the FontMetrics of this object.
*
* @param f the Font
* @return the FontMetrics, if supported, the object; otherwise, null
* @see getFont
*/
public FontMetrics getFontMetrics(Font f) {
return Box.this.getFontMetrics(f);
}
/**
* Determine if the object is enabled.
*
* @return true if object is enabled; otherwise, false
*/
public boolean isEnabled() {
return Box.this.isEnabled();
}
/**
* Set the enabled state of the object.
*
* @param b if true, enables this object; otherwise, disables it
*/
public void setEnabled(boolean b) {
Box.this.setEnabled(b);
}
/**
* Determine 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().
*
* @return true if object is visible; otherwise, false
*/
public boolean isVisible() {
return Box.this.isVisible();
}
/**
* Set the visible state of the object.
*
* @param b if true, shows this object; otherwise, hides it
*/
public void setVisible(boolean b) {
Box.this.setVisible(b);
}
/**
* Determine 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).
*
* @return true if object is showing; otherwise, false
*/
public boolean isShowing() {
return Box.this.isShowing();
}
/**
* 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.
*
* @param p the Point relative to the coordinate system of the object
* @return true if object contains Point; otherwise false
*/
public boolean contains(Point p) {
return Box.this.contains(p);
}
/**
* Returns the location of the object on the screen.
*
* @return location of object on screen -- can be null if this object
* is not on the screen
*/
public Point getLocationOnScreen() {
return Box.this.getLocationOnScreen();
}
/**
* 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.
*
* @return 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
*/
public Point getLocation() {
return Box.this.getLocation();
}
/**
* Sets the location of the object relative to the parent.
*/
public void setLocation(Point p) {
Box.this.setLocation(p);
}
/**
* 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.
*
* @return A rectangle indicating this component's bounds; null if
* this object is not on the screen.
*/
public Rectangle getBounds() {
return Box.this.getBounds();
}
/**
* 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.
*
* @param A rectangle indicating this component's bounds
*/
public void setBounds(Rectangle r) {
Box.this.setBounds(r);
}
/**
* 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.
*
* @return A Dimension object that indicates the size of this
* component; null if this object is not on the screen
*/
public Dimension getSize() {
return Box.this.getSize();
}
/**
* Resizes this object so that it has width width and height.
*
* @param d - The dimension specifying the new size of the object.
*/
public void setSize(Dimension d) {
Box.this.setSize(d);
}
/**
* Returns the Accessible child, if one exists, contained at the local
* coordinate Point.
*
* @param p The point defining the top-left corner of the Accessible,
* given in the coordinate space of the object's parent.
* @return the Accessible, if it exists, at the specified location;
* else null
*/
public Accessible getAccessibleAt(Point p) {
return SwingUtilities.getAccessibleAt(Box.this,p);
}
/**
* Returns whether this object can accept focus or not.
*
* @return true if object can accept focus; otherwise false
*/
public boolean isFocusTraversable() {
return Box.this.isFocusTraversable();
}
/**
* Requests focus for this object.
*/
public void requestFocus() {
Box.this.requestFocus();
}
/**
* Adds the specified focus listener to receive focus events from this
* component.
*
* @param l the focus listener
*/
public void addFocusListener(FocusListener l) {
Box.this.addFocusListener(l);
}
/**
* Removes the specified focus listener so it no longer receives focus
* events from this component.
*
* @param l the focus listener
*/
public void removeFocusListener(FocusListener l) {
Box.this.removeFocusListener(l);
}
} // inner class AccessibleBox
}