Class PopupMenu

java.lang.Object

java.awt.MenuComponent

java.awt.MenuItem

java.awt.Menu

java.awt.PopupMenu

All Implemented Interfaces:

MenuContainer, Serializable, Accessible

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	PopupMenu.AccessibleAWTPopupMenu	Inner class of PopupMenu used to provide default support for accessibility.

Nested classes/interfaces declared in class Menu

Menu.AccessibleAWTMenu

Modifier and Type	Class	Description
protected class	Menu.AccessibleAWTMenu	Inner class of Menu used to provide default support for accessibility.

Nested classes/interfaces declared in class MenuItem

MenuItem.AccessibleAWTMenuItem

Modifier and Type	Class	Description
protected class	MenuItem.AccessibleAWTMenuItem	Inner class of MenuItem used to provide default support for accessibility.

Nested classes/interfaces declared in class MenuComponent

MenuComponent.AccessibleAWTMenuComponent

Modifier and Type	Class	Description
protected class	MenuComponent.AccessibleAWTMenuComponent	Inner class of MenuComponent used to provide default support for accessibility.

Constructor Summary

Constructors

Constructor	Description
PopupMenu()	Creates a new popup menu with an empty name.
PopupMenu(String label)	Creates a new popup menu with the specified name.

Method Summary

Modifier and Type	Method	Description
void	addNotify()	Creates the popup menu's peer.
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 declared in class Menu

add, add, addSeparator, countItems, getItem, getItemCount, insert, insert, insertSeparator, isTearOff, paramString, remove, remove, removeAll, removeNotify

Modifier and Type	Method	Description
MenuItem	add(MenuItem mi)	Adds the specified menu item to this menu.
void	add(String label)	Adds an item with the specified label to this menu.
void	addSeparator()	Adds a separator line, or a hyphen, to the menu at the current position.
int	countItems()	Deprecated. As of JDK version 1.1, replaced by getItemCount().
MenuItem	getItem(int index)	Gets the item located at the specified index of this menu.
int	getItemCount()	Get the number of items in this menu.
void	insert(MenuItem menuitem, int index)	Inserts a menu item into this menu at the specified position.
void	insert(String label, int index)	Inserts a menu item with the specified label into this menu at the specified position.
void	insertSeparator(int index)	Inserts a separator at the specified position.
boolean	isTearOff()	Indicates whether this menu is a tear-off menu.
String	paramString()	Returns a string representing the state of this Menu.
void	remove(int index)	Removes the menu item at the specified index from this menu.
void	remove(MenuComponent item)	Removes the specified menu item from this menu.
void	removeAll()	Removes all items from this menu.
void	removeNotify()	Removes the menu's peer.

Methods declared in class MenuItem

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

Modifier and Type	Method	Description
void	addActionListener(ActionListener l)	Adds the specified action listener to receive action events from this menu item.
void	deleteShortcut()	Delete any MenuShortcut object associated with this menu item.
void	disable()	Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean).
protected final void	disableEvents(long eventsToDisable)	Disables event delivery to this menu item for events defined by the specified event mask parameter.
void	enable()	Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean).
void	enable(boolean b)	Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean).
protected final void	enableEvents(long eventsToEnable)	Enables event delivery to this menu item for events to be defined by the specified event mask parameter
String	getActionCommand()	Gets the command name of the action event that is fired by this menu item.
ActionListener[]	getActionListeners()	Returns an array of all the action listeners registered on this menu item.
String	getLabel()	Gets the label for this menu item.
<T extends EventListener> T[]	getListeners(Class<T> listenerType)	Returns an array of all the objects currently registered as FooListeners upon this MenuItem.
MenuShortcut	getShortcut()	Get the MenuShortcut object associated with this menu item,
boolean	isEnabled()	Checks whether this menu item is enabled.
protected void	processActionEvent(ActionEvent e)	Processes action events occurring on this menu item, by dispatching them to any registered ActionListener objects.
protected void	processEvent(AWTEvent e)	Processes events on this menu item.
void	removeActionListener(ActionListener l)	Removes the specified action listener so it no longer receives action events from this menu item.
void	setActionCommand(String command)	Sets the command name of the action event that is fired by this menu item.
void	setEnabled(boolean b)	Sets whether or not this menu item can be chosen.
void	setLabel(String label)	Sets the label for this menu item to the specified label.
void	setShortcut(MenuShortcut s)	Set the MenuShortcut object associated with this menu item.

Methods declared in class MenuComponent

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

Modifier and Type	Method	Description
final void	dispatchEvent(AWTEvent e)	Delivers an event to this component or one of its sub components.
Font	getFont()	Gets the font used for this menu component.
String	getName()	Gets the name of the menu component.
MenuContainer	getParent()	Returns the parent container for this menu component.
protected final Object	getTreeLock()	Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations.
boolean	postEvent(Event evt)	Deprecated. As of JDK version 1.1, replaced by dispatchEvent.
void	setFont(Font f)	Sets the font to be used for this menu component to the specified font.
void	setName(String name)	Sets the name of the component to the specified string.
String	toString()	Returns a representation of this menu component as a string.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Methods declared in interface MenuContainer

getFont, postEvent

Modifier and Type	Method	Description
Font	getFont()	Returns the font in use by this container.
boolean	postEvent(Event evt)	Deprecated. As of JDK version 1.1 replaced by dispatchEvent(AWTEvent).

Constructor Details

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 Details

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 hierarchy

RuntimeException - if the parent is not showing on screen

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this PopupMenu.

Specified by:

getAccessibleContext in interface Accessible

Overrides:

getAccessibleContext in class Menu

Returns:

the AccessibleContext of this PopupMenu

Since:

1.3