javax.swing.plaf.basic
Class BasicPopupMenuUI.MenuKeyboardHelper

java.lang.Object
  javax.swing.plaf.basic.BasicPopupMenuUI.MenuKeyboardHelper

All Implemented Interfaces:

ChangeListener, EventListener, KeyListener

Enclosing class:

BasicPopupMenuUI

private static class BasicPopupMenuUI.MenuKeyboardHelper

extends Object

implements ChangeListener, KeyListener

This helper is added to MenuSelectionManager as a ChangeListener to listen to menu selection changes. When a menu is activated, it passes focus to its parent JRootPane, and installs an ActionMap/InputMap pair on that JRootPane. Those maps are necessary in order for menu navigation to work. When menu is being deactivated, it restores focus to the component that has had it before menu activation, and uninstalls the maps. This helper is also installed as a KeyListener on root pane when menu is active. It forwards key events to MenuSelectionManager for mnemonic keys handling.

Field Summary

private boolean	focusTraversalKeysEnabled
private JRootPane	invokerRootPane
private Component	lastFocused
private MenuElement[]	lastPathSelected
private JPopupMenu	lastPopup
private ActionMap	menuActionMap
private InputMap	menuInputMap
private boolean	receivedKeyPressed
private FocusListener	rootPaneFocusListener

Constructor Summary

private

BasicPopupMenuUI.MenuKeyboardHelper()

Method Summary

(package private) void	addUIActionMap(JComponent c, ActionMap map)
(package private) void	addUIInputMap(JComponent c, InputMap map)
(package private) JPopupMenu	getActivePopup(MenuElement[] path) Return the last JPopupMenu in path, or null if none found
void	keyPressed(KeyEvent ev) Invoked when a key has been pressed.
void	keyReleased(KeyEvent ev) Invoked when a key has been released.
void	keyTyped(KeyEvent ev) Invoked when a key has been typed.
(package private) void	removeItems()
(package private) void	removeUIActionMap(JComponent c, ActionMap map)
(package private) void	removeUIInputMap(JComponent c, InputMap map)
void	stateChanged(ChangeEvent ev) Invoked when the target of the listener has changed its state.

Methods inherited from class java.lang.Object

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

Field Detail

lastFocused

private Component lastFocused

lastPathSelected

private MenuElement[] lastPathSelected

lastPopup

private JPopupMenu lastPopup

invokerRootPane

private JRootPane invokerRootPane

menuActionMap

private ActionMap menuActionMap

menuInputMap

private InputMap menuInputMap

focusTraversalKeysEnabled

private boolean focusTraversalKeysEnabled

receivedKeyPressed

private boolean receivedKeyPressed

rootPaneFocusListener

private FocusListener rootPaneFocusListener

Constructor Detail

BasicPopupMenuUI.MenuKeyboardHelper

private BasicPopupMenuUI.MenuKeyboardHelper()

Method Detail

removeItems

void removeItems()

getActivePopup

JPopupMenu getActivePopup(MenuElement[] path)

Return the last JPopupMenu in path, or null if none found

addUIInputMap

void addUIInputMap(JComponent c,
                   InputMap map)

addUIActionMap

void addUIActionMap(JComponent c,
                    ActionMap map)

removeUIInputMap

void removeUIInputMap(JComponent c,
                      InputMap map)

removeUIActionMap

void removeUIActionMap(JComponent c,
                       ActionMap map)

stateChanged

public void stateChanged(ChangeEvent ev)

Description copied from interface: ChangeListener

Invoked when the target of the listener has changed its state.

Specified by:

stateChanged in interface ChangeListener

Parameters:

ev - a ChangeEvent object

keyPressed

public void keyPressed(KeyEvent ev)

Description copied from interface: KeyListener

Invoked when a key has been pressed. See the class description for KeyEvent for a definition of a key pressed event.

Specified by:

keyPressed in interface KeyListener

keyReleased

public void keyReleased(KeyEvent ev)

Description copied from interface: KeyListener

Invoked when a key has been released. See the class description for KeyEvent for a definition of a key released event.

Specified by:

keyReleased in interface KeyListener

keyTyped

public void keyTyped(KeyEvent ev)

Description copied from interface: KeyListener

Invoked when a key has been typed. See the class description for KeyEvent for a definition of a key typed event.

Specified by:

keyTyped in interface KeyListener