java.awt
Class MenuComponent

java.lang.Object
  |
  +--java.awt.MenuComponent

Direct Known Subclasses:

MenuBar, MenuItem

public abstract class MenuComponent

extends Object

implements Serializable

The abstract class MenuComponent is the superclass of all menu-related components. In this respect, the class MenuComponent is analogous to the abstract superclass Component for AWT components.

Menu components receive and process AWT events, just as components do, through the method processEvent.

Since:

JDK1.0

See Also:

Serialized Form

Field Summary

(package private) static String	actionListenerK
(package private) sun.awt.AppContext	appContext The AppContext of the MenuComponent.
(package private) Font	font The Menu Components Font.
(package private) static String	itemListenerK
private String	name The Menu Components name.
private boolean	nameExplicitlySet A variable to indicate whether a name is explicitly set.
(package private) boolean	newEventsOnly
(package private) MenuContainer	parent
(package private) java.awt.peer.MenuComponentPeer	peer
private static long	serialVersionUID

Constructor Summary

MenuComponent()
Constructor for MenuComponent.

Method Summary

(package private) static void	()
(package private) String	constructComponentName() Construct a name for this MenuComponent.
void	dispatchEvent(AWTEvent e)
(package private) void	dispatchEventImpl(AWTEvent e)
(package private) boolean	eventEnabled(AWTEvent e)
(package private) Font	getFont_NoClientCode()
Font	getFont() Gets the font used for this menu component.
String	getName() Gets the name of the menu component.
(package private) MenuContainer	getParent_NoClientCode()
MenuContainer	getParent() Returns the parent container for this menu component.
java.awt.peer.MenuComponentPeer	getPeer() Deprecated. As of JDK version 1.1, programs should not directly manipulate peers.
protected Object	getTreeLock() Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.
private static void	initIDs() Initialize JNI field and method IDs
protected String	paramString() Returns the parameter string representing the state of this menu component.
boolean	postEvent(Event evt) Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent).
protected void	processEvent(AWTEvent e) Processes events occurring on this menu component.
private void	readObject(ObjectInputStream s)
void	removeNotify() Removes the menu component's peer.
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 inherited from class java.lang.Object

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

Field Detail

peer

transient java.awt.peer.MenuComponentPeer peer

parent

transient MenuContainer parent

appContext

transient sun.awt.AppContext appContext

The AppContext of the MenuComponent. This is set in the constructor and never changes.

font

Font font

The Menu Components Font. This value can be null at which point a default will be used.

See Also:

setFont(), getFont()

name

private String name

The Menu Components name.

See Also:

getName(), setName()

nameExplicitlySet

private boolean nameExplicitlySet

A variable to indicate whether a name is explicitly set. If it is true the name will be set explicitly.

See Also:

setName()

newEventsOnly

boolean newEventsOnly

See Also:

dispatchEvent()

actionListenerK

static final String actionListenerK

itemListenerK

static final String itemListenerK

serialVersionUID

private static final long serialVersionUID

Constructor Detail

MenuComponent

public MenuComponent()

Constructor for MenuComponent.

Method Detail

static void ()

constructComponentName

String constructComponentName()

Construct a name for this MenuComponent. Called by getName() when the name is null.

getName

public String getName()

Gets the name of the menu component.

Returns:

the name of the menu component.

Since:

JDK1.1

See Also:

setName(java.lang.String)

setName

public void setName(String name)

Sets the name of the component to the specified string.

Parameters:

name - the name of the menu component.

Since:

JDK1.1

See Also:

getName()

getParent

public MenuContainer getParent()

Returns the parent container for this menu component.

Returns:

the menu component containing this menu component, or null if this menu component is the outermost component, the menu bar itself.

getParent_NoClientCode

final MenuContainer getParent_NoClientCode()

getPeer

public java.awt.peer.MenuComponentPeer getPeer()

Deprecated. As of JDK version 1.1, programs should not directly manipulate peers.

getFont

public Font getFont()

Gets the font used for this menu component.

Returns:

the font used in this menu component, if there is one; null otherwise.

See Also:

setFont(java.awt.Font)

getFont_NoClientCode

final Font getFont_NoClientCode()

setFont

public void setFont(Font f)

Sets the font to be used for this menu component to the specified font. This font is also used by all subcomponents of this menu component, unless those subcomponents specify a different font.

Parameters:

f - the font to be set.

See Also:

getFont()

removeNotify

public void removeNotify()

Removes the menu component's peer. The peer allows us to modify the appearance of the menu component without changing the functionality of the menu component.

postEvent

public boolean postEvent(Event evt)

Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent).

Posts the specified event to the menu. This method is part of the Java 1.0 event system and it is maintained only for backwards compatibility. Its use is discouraged, and it may not be supported in the future.

Parameters:

evt - the event which is to take place

dispatchEvent

public final void dispatchEvent(AWTEvent e)

dispatchEventImpl

void dispatchEventImpl(AWTEvent e)

eventEnabled

boolean eventEnabled(AWTEvent e)

processEvent

protected void processEvent(AWTEvent e)

Processes events occurring on this menu component.

Parameters:

e - the event

Since:

JDK1.1

paramString

protected String paramString()

Returns the parameter string representing the state of this menu component. This string is useful for debugging.

Returns:

the parameter string of this menu component.

toString

public String toString()

Returns a representation of this menu component as a string.

Returns:

a string representation of this menu component.

Overrides:

toString in class Object

getTreeLock

protected final Object getTreeLock()

Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.

Returns:

This component's locking object.

readObject

private void readObject(ObjectInputStream s)
                 throws ClassNotFoundException,
                        IOException

initIDs

private static void initIDs()

Initialize JNI field and method IDs