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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class PopupMenu - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt
Class PopupMenu

java.lang.Object
  |
  +--java.awt.MenuComponent
        |
        +--java.awt.MenuItem
              |
              +--java.awt.Menu
                    |
                    +--java.awt.PopupMenu

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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.

See Also:

Serialized Form

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Constructor Summary

PopupMenu()           Creates a new popup menu.

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

 

Method Summary
void	addNotify()           Creates the popup menu's peer.
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, getItem, getItemCount, insert, insert, insertSeparator, isTearOff, paramString, remove, remove, removeAll, removeNotify

 

Methods inherited from class java.awt.MenuItem

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

 

Methods inherited from class java.awt.MenuComponent

dispatchEvent, getFont, getName, getParent, getPeer, getTreeLock, postEvent, setFont, setName, toString

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

PopupMenu

public PopupMenu()

Creates a new popup menu.

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PopupMenu

public PopupMenu(String label)

Creates a new popup menu with the specified name.

Parameters:

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

Method Detail

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

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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:

IllegalArgumentException - if this PopupMenu has a non- Component parent

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