Class MenuComponent
- 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
Modifier and Type | Class | Description |
---|---|---|
protected class | MenuComponent.AccessibleAWTMenuComponent | Inner class of |
Constructor Summary
Constructor | Description |
---|---|
MenuComponent() | Creates a |
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 the |
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 this |
boolean | postEvent(Event evt) | Deprecated. As of JDK version 1.1, replaced by dispatchEvent . |
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 declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Constructor Detail
MenuComponent
public MenuComponent() throws HeadlessException
Creates a MenuComponent
.
- Throws:
-
HeadlessException
- ifGraphicsEnvironment.isHeadless
returnstrue
- See Also:
GraphicsEnvironment.isHeadless()
Method Detail
getName
public String 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
public void setName(String name)
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
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
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.
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 public boolean postEvent(Event evt)
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.
- Parameters:
-
evt
- the event which is to take place - Returns:
- unconditionally returns false
dispatchEvent
public final void dispatchEvent(AWTEvent e)
Delivers an event to this component or one of its sub components.
- Parameters:
-
e
- the event
processEvent
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.
- Parameters:
-
e
- the event - Since:
- 1.1
paramString
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
.
- Returns:
- the parameter string of this menu component
toString
public String toString()
Returns a representation of this menu component as a string.
getTreeLock
protected final Object 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
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.
- Returns:
- the
AccessibleContext
of thisMenuComponent
- Since:
- 1.3