java.lang.Object
java.awt.MenuComponent
- All Implemented Interfaces:
Serializable
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:
- 1.0
- See Also:
- Serialized Form
-
Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
MenuComponent.AccessibleAWTMenuComponent
Inner class ofMenuComponent
used to provide default support for accessibility. -
Constructor Summary
Constructors Constructor Description MenuComponent()
Creates aMenuComponent
. -
Method Summary
Modifier and Type Method Description void
dispatchEvent(AWTEvent e)
Delivers an event to this component or one of its sub components.AccessibleContext
getAccessibleContext()
Gets theAccessibleContext
associated with thisMenuComponent
.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 Object
getTreeLock()
Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations.protected String
paramString()
Returns a string representing the state of thisMenuComponent
.boolean
postEvent(Event evt)
Deprecated.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.
-
Constructor Details
-
MenuComponent
Creates aMenuComponent
.- Throws:
HeadlessException
- ifGraphicsEnvironment.isHeadless
returnstrue
- See Also:
GraphicsEnvironment.isHeadless()
-
-
Method Details
-
getName
Gets the name of the menu component.- Returns:
- the name of the menu component
- Since:
- 1.1
- See Also:
setName(java.lang.String)
-
setName
Sets the name of the component to the specified string.- Parameters:
name
- the name of the menu component- Since:
- 1.1
- See Also:
getName()
-
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
-
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
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.- Parameters:
f
- the font to be set- See Also:
getFont()
,Font.getAttributes()
,TextAttribute
-
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
Deprecated.As of JDK version 1.1, replaced bydispatchEvent
.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- Returns:
- unconditionally returns false
-
dispatchEvent
Delivers an event to this component or one of its sub components.- Parameters:
e
- the event
-
processEvent
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.- Parameters:
e
- the event- Since:
- 1.1
-
paramString
Returns a string representing the state of thisMenuComponent
. 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 benull
.- Returns:
- the parameter string of this menu component
-
toString
Returns a representation of this menu component as a string. -
getTreeLock
Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations.- Returns:
- this component's locking object
-
getAccessibleContext
Gets theAccessibleContext
associated with thisMenuComponent
. The method implemented by this base class returnsnull
. Classes that extendMenuComponent
should implement this method to return theAccessibleContext
associated with the subclass.- Returns:
- the
AccessibleContext
of thisMenuComponent
- Since:
- 1.3
-
dispatchEvent
.