# Class BasicComboBoxUI.FocusHandler

java.lang.Object
javax.swing.plaf.basic.BasicComboBoxUI.FocusHandler

All Implemented Interfaces:
  `FocusListener, EventListener`

Enclosing class:
  `BasicComboBoxUI`

public class BasicComboBoxUI.FocusHandler extends Object implements FocusListener
This listener hides the popup when the focus is lost. It also repaints when focus is gained or lost. This public inner class should be treated as protected. Instantiate it only within subclasses of `BasicComboBoxUI`.

## Constructor Summary

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

## Method Summary

Modifier and Type
Method
Description
`void`
`focusGained(FocusEvent e)`
Invoked when a component gains the keyboard focus.
`void`
`focusLost(FocusEvent e)`
Invoked when a component loses the keyboard focus.

### Methods declared in class Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
Modifier and Type
Method
Description
`protected Object`
`clone()`
Creates and returns a copy of this object.
`boolean`
`equals(Object obj)`
Indicates whether some other object is "equal to" this one.
`protected void`
`finalize()`
Deprecated, for removal: This API element is subject to removal in a future version.
Finalization is deprecated and subject to removal in a future release.
`final Class<?>`
`getClass()`
Returns the runtime class of this `Object`.
`int`
`hashCode()`
Returns a hash code value for this object.
`final void`
`notify()`
Wakes up a single thread that is waiting on this object's monitor.
`final void`
`notifyAll()`
Wakes up all threads that are waiting on this object's monitor.
`String`
`toString()`
Returns a string representation of the object.
`final void`
`wait()`
Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`
`wait(long timeoutMillis)`
Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`
`wait(long timeoutMillis, int nanos)`
Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

## Constructor Details

### FocusHandler

public FocusHandler()
Constructs a `FocusHandler`.

## Method Details

### focusGained

public void focusGained(FocusEvent e)
Description copied from interface: `FocusListener`
Invoked when a component gains the keyboard focus.

Specified by:
  `focusGained` in interface `FocusListener`
Parameters:
  `e` - the event to be processed

### focusLost

public void focusLost(FocusEvent e)
Description copied from interface: `FocusListener`
Invoked when a component loses the keyboard focus.

Specified by:
  `focusLost` in interface `FocusListener`
Parameters:
  `e` - the event to be processed