# Class MenuSelectionManager

java.lang.Object
javax.swing.MenuSelectionManager

public class MenuSelectionManager extends Object
A MenuSelectionManager owns the selection in menu hierarchy.

Since:
  1.2

## Field Summary

Fields
Modifier and Type
Field
Description
`protected ChangeEvent`
`changeEvent`
Only one ChangeEvent is needed per button model instance since the event's only state is the source property.
`protected EventListenerList`
`listenerList`
The collection of registered listeners

## Constructor Summary

Constructors
Constructor
Description
`MenuSelectionManager()`
Constructs a `MenuSelectionManager`.

## Method Summary

Modifier and Type
Method
Description
`void`
`addChangeListener(ChangeListener l)`
Adds a ChangeListener to the button.
`void`
`clearSelectedPath()`
Tell the menu selection to close and unselect all the menu components.
`Component`
`componentForPoint(Component source, Point sourcePoint)`
Returns the component in the currently selected path which contains sourcePoint.
`static MenuSelectionManager`
`defaultManager()`
Returns the default menu selection manager.
`protected void`
`fireStateChanged()`
Notifies all listeners that have registered interest for notification on this event type.
`ChangeListener[]`
`getChangeListeners()`
Returns an array of all the `ChangeListener`s added to this MenuSelectionManager with addChangeListener().
`MenuElement[]`
`getSelectedPath()`
Returns the path to the currently selected menu item
`boolean`
`isComponentPartOfCurrentMenu(Component c)`
Return true if `c` is part of the currently used menu
`void`
`processKeyEvent(KeyEvent e)`
When a MenuElement receives an event from a KeyListener, it should never process the event directly.
`void`
`processMouseEvent(MouseEvent event)`
When a MenuElement receives an event from a MouseListener, it should never process the event directly.
`void`
`removeChangeListener(ChangeListener l)`
Removes a ChangeListener from the button.
`void`
`setSelectedPath(MenuElement[] path)`
Changes the selection in the menu hierarchy.

### Methods declared in class Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Field Details

### changeEvent

protected transient ChangeEvent changeEvent
Only one ChangeEvent is needed per button model instance since the event's only state is the source property. The source of events generated is always "this".

### listenerList

protected EventListenerList listenerList
The collection of registered listeners

## Constructor Details

### MenuSelectionManager

public MenuSelectionManager()
Constructs a `MenuSelectionManager`.

## Method Details

### defaultManager

public static MenuSelectionManager defaultManager()
Returns the default menu selection manager.

Returns:
  a MenuSelectionManager object

### setSelectedPath

public void setSelectedPath(MenuElement[] path)
Changes the selection in the menu hierarchy. The elements in the array are sorted in order from the root menu element to the currently selected menu element.

Note that this method is public but is used by the look and feel engine and should not be called by client applications.

Parameters:
  `path` - an array of `MenuElement` objects specifying the selected path

### getSelectedPath

public MenuElement[] getSelectedPath()
Returns the path to the currently selected menu item

Returns:
  an array of MenuElement objects representing the selected path

### clearSelectedPath

public void clearSelectedPath()
Tell the menu selection to close and unselect all the menu components. Call this method when a choice has been made

### addChangeListener

public void addChangeListener(ChangeListener l)
Adds a ChangeListener to the button.

Parameters:
  `l` - the listener to add

### removeChangeListener

public void removeChangeListener(ChangeListener l)
Removes a ChangeListener from the button.

Parameters:
  `l` - the listener to remove

### getChangeListeners

public ChangeListener[] getChangeListeners()
Returns an array of all the `ChangeListener`s added to this MenuSelectionManager with addChangeListener().

Returns:
  all of the `ChangeListener`s added or an empty array if no listeners have been added
Since:
  1.4

### fireStateChanged

protected void fireStateChanged()
Notifies all listeners that have registered interest for notification on this event type. The event instance is created lazily.

See Also:
  - `EventListenerList`

### processMouseEvent

public void processMouseEvent(MouseEvent event)
When a MenuElement receives an event from a MouseListener, it should never process the event directly. Instead all MenuElements should call this method with the event.

Parameters:
  `event` - a MouseEvent object

### componentForPoint

public Component componentForPoint(Component source, Point sourcePoint)
Returns the component in the currently selected path which contains sourcePoint.

Parameters:
  `source` - The component in whose coordinate space sourcePoint is given
  `sourcePoint` - The point which is being tested
Returns:
  The component in the currently selected path which contains sourcePoint (relative to the source component's coordinate space. If sourcePoint is not inside a component on the currently selected path, null is returned.

### processKeyEvent

public void processKeyEvent(KeyEvent e)
When a MenuElement receives an event from a KeyListener, it should never process the event directly. Instead all MenuElements should call this method with the event.

Parameters:
  `e` - a KeyEvent object

### isComponentPartOfCurrentMenu

public boolean isComponentPartOfCurrentMenu(Component c)
Return true if `c` is part of the currently used menu

Parameters:
  `c` - a `Component`
Returns:
  true if `c` is part of the currently used menu, false otherwise