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abstract public class: MenuComponent [javadoc | source]

All Implemented Interfaces:

Direct Known Subclasses:
    PopupMenu, Menu, MenuItem, CheckboxMenuItem, MenuBar

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.

Nested Class Summary:
abstract protected class  MenuComponent.AccessibleAWTMenuComponent  Inner class of MenuComponent used to provide default support for accessibility. This class is not meant to be used directly by application developers, but is instead meant only to be subclassed by menu component developers.

The class used to obtain the accessible role for this object. 

Field Summary
transient  MenuComponentPeer peer     
transient  MenuContainer parent     
transient  AppContext appContext    The AppContext of the MenuComponent. This is set in the constructor and never changes. 
 Font font    The menu component's font. This value can be null at which point a default will be used. This defaults to null. 
 boolean newEventsOnly    Defaults to false. 
static final  String actionListenerK     
static final  String itemListenerK     
 AccessibleContext accessibleContext     
 public MenuComponent() throws HeadlessException 
    Creates a MenuComponent.
    HeadlessException - if GraphicsEnvironment.isHeadless returns true
    Also see:
    exception: HeadlessException - if GraphicsEnvironment.isHeadless returns true
Method from java.awt.MenuComponent Summary:
constructComponentName,   dispatchEvent,   dispatchEventImpl,   eventEnabled,   getAccessControlContext,   getAccessibleChildIndex,   getAccessibleContext,   getAccessibleIndexInParent,   getAccessibleStateSet,   getFont,   getFont_NoClientCode,   getName,   getParent,   getParent_NoClientCode,   getPeer,   getTreeLock,   paramString,   postEvent,   processEvent,   removeNotify,   setFont,   setName,   toString
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from java.awt.MenuComponent Detail:
 String constructComponentName() 
    Constructs a name for this MenuComponent. Called by getName when the name is null.
 public final  void dispatchEvent(AWTEvent e) 
    Delivers an event to this component or one of its sub components.
  void dispatchEventImpl(AWTEvent e) 
 boolean eventEnabled(AWTEvent e) 
 final AccessControlContext getAccessControlContext() 
 int getAccessibleChildIndex(MenuComponent child) 
    Gets the index of the child within this MenuComponent.
 public AccessibleContext getAccessibleContext() 
    Gets the AccessibleContext associated with this MenuComponent. The method implemented by this base class returns null. Classes that extend MenuComponent should implement this method to return the AccessibleContext associated with the subclass.
 int getAccessibleIndexInParent() 
    Gets the index of this object in its accessible parent.
 AccessibleStateSet getAccessibleStateSet() 
    Gets the state of this object.
 public Font getFont() 
    Gets the font used for this menu component.
 final Font getFont_NoClientCode() 
 public String getName() 
    Gets the name of the menu component.
 public MenuContainer getParent() 
    Returns the parent container for this menu component.
 final MenuContainer getParent_NoClientCode() 
 public MenuComponentPeer getPeer() 
Deprecated! As - of JDK version 1.1, programs should not directly manipulate peers.

 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.
 protected String paramString() 
    Returns a string representing the state of this MenuComponent. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.
 public boolean postEvent(Event evt) 
Deprecated! As - of JDK version 1.1, replaced by dispatchEvent .

    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.
 protected  void processEvent(AWTEvent e) 
    Processes events occurring on this menu component.

    Note that if the event parameter is null the behavior is unspecified and may result in an exception.

 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.
 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.

    Some platforms may not support setting of all font attributes of a menu component; in such cases, calling setFont will have no effect on the unsupported font attributes of this menu component. Unless subcomponents of this menu component specify a different font, this font will be used by those subcomponents if supported by the underlying platform.

 public  void setName(String name) 
    Sets the name of the component to the specified string.
 public String toString() 
    Returns a representation of this menu component as a string.