java.awt
Class PopupMenu

java.lang.Object
  java.awt.MenuComponent
      java.awt.MenuItem
          java.awt.Menu
              java.awt.PopupMenu

All Implemented Interfaces:

javax.accessibility.Accessible, MenuContainer, Serializable

public class PopupMenu

extends Menu

A class that implements a menu which can be dynamically popped up at a specified position within a component.

As the inheritance hierarchy implies, a PopupMenu can be used anywhere a Menu can be used. However, if you use a PopupMenu like a Menu (e.g., you add it to a MenuBar), then you cannot call show on that PopupMenu.

Author:

Amy Fowler

See Also:

Serialized Form

Nested Class Summary

protected class

PopupMenu.AccessibleAWTPopupMenu Inner class of PopupMenu used to provide default support for accessibility.

Nested classes inherited from class java.awt.Menu

Menu.AccessibleAWTMenu

Nested classes inherited from class java.awt.MenuItem

MenuItem.AccessibleAWTMenuItem

Nested classes inherited from class java.awt.MenuComponent

MenuComponent.AccessibleAWTMenuComponent

Field Summary

private static String	base
(package private) static int	nameCounter
private static long	serialVersionUID

Fields inherited from class java.awt.Menu

isHelpMenu, items, tearOff

Fields inherited from class java.awt.MenuItem

actionCommand, actionListener, enabled, eventMask, label

Fields inherited from class java.awt.MenuComponent

accessibleContext, actionListenerK, appContext, font, itemListenerK, newEventsOnly, parent, peer

Constructor Summary

PopupMenu()
Creates a new popup menu with an empty name.

PopupMenu(String label)
Creates a new popup menu with the specified name.

Method Summary

void	addNotify() Creates the popup menu's peer.
(package private) String	constructComponentName() Constructs a name for this MenuComponent.
javax.accessibility.AccessibleContext	getAccessibleContext() Gets the AccessibleContext associated with this PopupMenu.
void	show(Component origin, int x, int y) Shows the popup menu at the x, y position relative to an origin component.

Methods inherited from class java.awt.Menu

add, add, addSeparator, countItems, countItemsImpl, deleteShortcut, getItem, getItemCount, getItemImpl, getShortcutMenuItem, handleShortcut, insert, insert, insertSeparator, isTearOff, paramString, remove, remove, removeAll, removeNotify, shortcuts

Methods inherited from class java.awt.MenuItem

addActionListener, deleteShortcut, disable, disableEvents, doMenuEvent, enable, enable, enableEvents, eventEnabled, getActionCommand, getActionListeners, getLabel, getListeners, getShortcut, isEnabled, processActionEvent, processEvent, removeActionListener, setActionCommand, setEnabled, setLabel, setShortcut

Methods inherited from class java.awt.MenuComponent

dispatchEvent, dispatchEventImpl, getAccessibleIndexInParent, getAccessibleStateSet, getFont_NoClientCode, getFont, getName, getParent_NoClientCode, getParent, getPeer, getTreeLock, postEvent, setFont, setName, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.awt.MenuContainer

getFont, postEvent

Field Detail

base

private static final String base

See Also:

Constant Field Values

nameCounter

static int nameCounter

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

PopupMenu

public PopupMenu()
          throws HeadlessException

Creates a new popup menu with an empty name.

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

See Also:

GraphicsEnvironment.isHeadless()

PopupMenu

public PopupMenu(String label)
          throws HeadlessException

Creates a new popup menu with the specified name.

Parameters:

label - a non-null string specifying the popup menu's label

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

See Also:

GraphicsEnvironment.isHeadless()

Method Detail

constructComponentName

String constructComponentName()

Constructs a name for this MenuComponent. Called by getName when the name is null.

Overrides:

constructComponentName in class Menu

addNotify

public void addNotify()

Creates the popup menu's peer. The peer allows us to change the appearance of the popup menu without changing any of the popup menu's functionality.

Overrides:

addNotify in class Menu

show

public void show(Component origin,
                 int x,
                 int y)

Shows the popup menu at the x, y position relative to an origin component. The origin component must be contained within the component hierarchy of the popup menu's parent. Both the origin and the parent must be showing on the screen for this method to be valid.

If this PopupMenu is being used as a Menu (i.e., it has a non-Component parent), then you cannot call this method on the PopupMenu.

Parameters:

origin - the component which defines the coordinate space

x - the x coordinate position to popup the menu

y - the y coordinate position to popup the menu

Throws:

NullPointerException - if the parent is null

IllegalArgumentException - if this PopupMenu has a non-Component parent

IllegalArgumentException - if the origin is not in the parent's heirarchy

RuntimeException - if the parent is not showing on screen

getAccessibleContext

public javax.accessibility.AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this PopupMenu.

Specified by:

getAccessibleContext in interface javax.accessibility.Accessible

Overrides:

getAccessibleContext in class Menu

Returns:

the AccessibleContext of this PopupMenu