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

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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

Constructor Summary

MenuComponent()
          Constructor for MenuComponent.

Method Summary

void dispatchEvent(AWTEvent e)


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.

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.

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.

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, wait, wait, wait

Constructor Detail

MenuComponent

public MenuComponent()

Constructor for MenuComponent.

Method Detail

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.

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)

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)

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.

Overrides:: toString in class Object

Returns:: a string representation of this menu component.

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.