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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
.
Nested Class Summary | |
---|---|
protected abstract class |
Inner class of MenuComponent used to provide
default support for accessibility. |
Constructor Summary | |
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Creates a MenuComponent .
|
Method Summary | |
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void |
Delivers an event to this component or one of its sub components. |
AccessibleContext |
Gets the AccessibleContext associated with
this MenuComponent .
|
Font |
getFont() Gets the font used for this menu component. |
String |
getName() Gets the name of the menu component. |
MenuContainer |
Returns the parent container for this menu component. |
MenuComponentPeer |
getPeer() |
protected Object |
Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations. |
protected String |
Returns a string representing the state of this MenuComponent .
|
boolean |
Posts the specified event to the menu. |
protected void |
Processes events occurring on this menu component. |
void |
Removes the menu component's peer. |
void |
Sets the font to be used for this menu component to the specified font. |
void |
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, toString, wait, wait, wait |
Constructor Detail |
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public MenuComponent() throws HeadlessException
MenuComponent
.
HeadlessException
- if
GraphicsEnvironment.isHeadless
returns true
Method Detail |
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public final void dispatchEvent(AWTEvent e)
e
- the eventpublic AccessibleContext getAccessibleContext()
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.
AccessibleContext
of this
MenuComponent
public Font getFont()
null
otherwisepublic String getName()
public MenuContainer getParent()
null
if this menu component
is the outermost component, the menu bar itselfpublic MenuComponentPeer getPeer()
protected final Object getTreeLock()
protected String paramString()
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)
evt
- the event which is to take placeprotected void processEvent(AWTEvent e)
Note that if the event parameter is null
the behavior is unspecified and may result in an
exception.
e
- the eventpublic void removeNotify()
public void setFont(Font f)
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.
f
- the font to be setpublic void setName(String name)
name
- the name of the menu componentpublic String toString()
toString
in class Object
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