javax.swing
Class JPopupMenu

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.JPopupMenu

All Implemented Interfaces:

javax.accessibility.Accessible, ImageObserver, MenuContainer, MenuElement, Serializable

Direct Known Subclasses:

BasicComboPopup

public class JPopupMenu

extends JComponent

implements javax.accessibility.Accessible, MenuElement

An implementation of a popup menu -- a small window that pops up and displays a series of choices. A JPopupMenu is used for the menu that appears when the user selects an item on the menu bar. It is also used for "pull-right" menu that appears when the selects a menu item that activates it. Finally, a JPopupMenu can also be used anywhere else you want a menu to appear. For example, when the user right-clicks in a specified area.

For information and examples of using popup menus, see How to Use Menus in The Java Tutorial. For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JPopupMenu key assignments.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see XMLEncoder.

Author:

Georges Saab, David Karlton, Arnaud Weber

See Also:

Serialized Form

Nested Class Summary

protected class	JPopupMenu.AccessibleJPopupMenu This class implements accessibility support for the JPopupMenu class.
private class	JPopupMenu.ActionChangedListener
static class	JPopupMenu.Separator A popup menu-specific separator.

Nested classes inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent, JComponent.ActionStandin, JComponent.IntVector, JComponent.KeyboardState

Nested classes inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

private static Object	classLock
private static boolean	DEBUG
private static Object	defaultLWPopupEnabledKey Key used in AppContext to determine if light way popups are the default.
private int	desiredLocationX
private int	desiredLocationY
(package private) Frame	frame
(package private) Component	invoker
private String	label
private boolean	lightWeightPopup Used to indicate if lightweight popups should be used.
private Insets	margin
private boolean	paintBorder
(package private) Popup	popup
(package private) static boolean	popupPostionFixDisabled Bug#4425878-Property javax.swing.adjustPopupLocationToFit introduced
private SingleSelectionModel	selectionModel
private static boolean	TRACE
private static String	uiClassID
private static boolean	VERBOSE

Fields inherited from class javax.swing.JComponent

_bounds, accessibleContext, listenerList, paintingChild, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Container

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

JPopupMenu()
Constructs a JPopupMenu without an "invoker".

JPopupMenu(String label)
Constructs a JPopupMenu with the specified title.

Method Summary

JMenuItem	add(Action a) Appends a new menu item to the end of the menu which dispatches the specified Action object.
JMenuItem	add(JMenuItem menuItem) Appends the specified menu item to the end of this menu.
JMenuItem	add(String s) Creates a new menu item with the specified text and appends it to the end of this menu.
void	addPopupMenuListener(PopupMenuListener l) Adds a PopupMenu listener.
void	addSeparator() Appends a new separator at the end of the menu.
(package private) Point	adjustPopupLocationToFitScreen(int xposition, int yposition) Returns an point which has been adjusted to take into account of the desktop bounds, taskbar and multi-monitor configuration.
(package private) boolean	alwaysOnTop() Always returns true since popups, by definition, should always be on top of all other windows.
protected java.beans.PropertyChangeListener	createActionChangeListener(JMenuItem b) Returns a properly configured PropertyChangeListener which updates the control as changes to the Action occur.
protected JMenuItem	createActionComponent(Action a) Factory method which creates the JMenuItem for Actions added to the JPopupMenu.
protected void	firePopupMenuCanceled() Notifies PopupMenuListeners that this popup menu is cancelled.
protected void	firePopupMenuWillBecomeInvisible() Notifies PopupMenuListeners that this popup menu will become invisible.
protected void	firePopupMenuWillBecomeVisible() Notifies PopupMenuListeners that this popup menu will become visible.
javax.accessibility.AccessibleContext	getAccessibleContext() Gets the AccessibleContext associated with this JPopupMenu.
Component	getComponent() Returns this JPopupMenu component.
Component	getComponentAtIndex(int i) Deprecated. replaced by getComponent(int i)
int	getComponentIndex(Component c) Returns the index of the specified component.
static boolean	getDefaultLightWeightPopupEnabled() Gets the defaultLightWeightPopupEnabled property, which by default is true.
private static Frame	getFrame(Component c)
Component	getInvoker() Returns the component which is the 'invoker' of this popup menu.
String	getLabel() Returns the popup menu's label
Insets	getMargin() Returns the margin, in pixels, between the popup menu's border and its containees.
private Popup	getPopup() Returns a Popup instance from the PopupMenuUI that has had show invoked on it.
PopupMenuListener[]	getPopupMenuListeners() Returns an array of all the PopupMenuListeners added to this JMenuItem with addPopupMenuListener().
(package private) JPopupMenu	getRootPopupMenu() Returns the popup menu which is at the root of the menu system for this popup menu.
SingleSelectionModel	getSelectionModel() Returns the model object that handles single selections.
MenuElement[]	getSubElements() Returns an array of MenuElements containing the submenu for this menu component.
PopupMenuUI	getUI() Returns the look and feel (L&F) object that renders this component.
String	getUIClassID() Returns the name of the L&F class that renders this component.
void	insert(Action a, int index) Inserts a menu item for the specified Action object at a given position.
void	insert(Component component, int index) Inserts the specified component into the menu at a given position.
boolean	isBorderPainted() Checks whether the border should be painted.
boolean	isLightWeightPopupEnabled() Gets the lightWeightPopupEnabled property.
private boolean	isPopupMenu() Returns true if the popup menu is a standalone popup menu rather than the submenu of a JMenu.
boolean	isPopupTrigger(MouseEvent e) Returns true if the MouseEvent is considered a popup trigger by the JPopupMenu's currently installed UI.
(package private) boolean	isSubPopupMenu(JPopupMenu popup) Examines the list of menu items to determine whether popup is a popup menu.
boolean	isVisible() Returns true if the popup menu is visible (currently being displayed).
void	menuSelectionChanged(boolean isIncluded) Messaged when the menubar selection changes to activate or deactivate this menu.
void	pack() Lays out the container so that it uses the minimum space needed to display its contents.
protected void	paintBorder(Graphics g) Paints the popup menu's border if the borderPainted property is true.
protected String	paramString() Returns a string representation of this JPopupMenu.
protected void	processFocusEvent(FocusEvent evt) Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.
protected void	processKeyEvent(KeyEvent evt) Processes key stroke events such as mnemonics and accelerators.
void	processKeyEvent(KeyEvent e, MenuElement[] path, MenuSelectionManager manager) This method is required to conform to the MenuElement interface, but it not implemented.
void	processMouseEvent(MouseEvent event, MenuElement[] path, MenuSelectionManager manager) This method is required to conform to the MenuElement interface, but it not implemented.
private void	readObject(ObjectInputStream s) We use the ObjectInputStream "registerValidation" callback to update the UI for the entire tree of components after they've all been read in.
void	remove(int pos) Removes the component at the specified index from this popup menu.
void	removePopupMenuListener(PopupMenuListener l) Removes a PopupMenu listener.
void	setBorderPainted(boolean b) Sets whether the border should be painted.
static void	setDefaultLightWeightPopupEnabled(boolean aFlag) Sets the default value of the lightWeightPopupEnabled property.
void	setInvoker(Component invoker) Sets the invoker of this popup menu -- the component in which the popup menu menu is to be displayed.
void	setLabel(String label) Sets the popup menu's label.
void	setLightWeightPopupEnabled(boolean aFlag) Sets the value of the lightWeightPopupEnabled property, which by default is true.
void	setLocation(int x, int y) Sets the location of the upper left corner of the popup menu using x, y coordinates.
void	setPopupSize(Dimension d) Sets the size of the Popup window using a Dimension object.
void	setPopupSize(int width, int height) Sets the size of the Popup window to the specified width and height.
void	setSelected(Component sel) Sets the currently selected component, This will result in a change to the selection model.
void	setSelectionModel(SingleSelectionModel model) Sets the model object to handle single selections.
void	setUI(PopupMenuUI ui) Sets the L&F object that renders this component.
void	setVisible(boolean b) Sets the visibility of the popup menu.
void	show(Component invoker, int x, int y) Displays the popup menu at the position x,y in the coordinate space of the component invoker.
void	updateUI() Resets the UI property to a value from the current look and feel.
private void	writeObject(ObjectOutputStream s) Before writing a JComponent to an ObjectOutputStream we temporarily uninstall its UI.

Methods inherited from class javax.swing.JComponent

_paintImmediately, addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, checkIfChildObscuredBySibling, componentInputMapChanged, computeVisibleRect, computeVisibleRect, compWriteObjectNotify, contains, createToolTip, disable, enable, enableSerialization, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getCreatedDoubleBuffer, getDebugGraphicsOptions, getDefaultLocale, getGraphics, getHeight, getInputMap, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getManagingFocusBackwardTraversalKeys, getManagingFocusForwardTraversalKeys, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getWriteObjCounter, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isOptimizedDrawingEnabled, isPaintingOrigin, isPaintingTile, isPreferredSizeSet, isRequestFocusEnabled, isValidateRoot, paint, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyBindings, processKeyBindingsForAllComponents, processMouseMotionEvent, putClientProperty, rectangleIsObscured, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setCreatedDoubleBuffer, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFont, setForeground, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPaintingChild, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setWriteObjCounter, shouldDebugGraphics, superProcessMouseMotionEvent, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isShowing, isValid, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail

uiClassID

private static final String uiClassID

See Also:

getUIClassID(), readObject(java.io.ObjectInputStream), Constant Field Values

defaultLWPopupEnabledKey

private static final Object defaultLWPopupEnabledKey

Key used in AppContext to determine if light way popups are the default.

popupPostionFixDisabled

static boolean popupPostionFixDisabled

Bug#4425878-Property javax.swing.adjustPopupLocationToFit introduced

invoker

transient Component invoker

popup

transient Popup popup

frame

transient Frame frame

desiredLocationX

private int desiredLocationX

desiredLocationY

private int desiredLocationY

label

private String label

paintBorder

private boolean paintBorder

margin

private Insets margin

lightWeightPopup

private boolean lightWeightPopup

Used to indicate if lightweight popups should be used.

selectionModel

private SingleSelectionModel selectionModel

classLock

private static final Object classLock

TRACE

private static final boolean TRACE

See Also:

Constant Field Values

VERBOSE

private static final boolean VERBOSE

See Also:

Constant Field Values

DEBUG

private static final boolean DEBUG

See Also:

Constant Field Values

Constructor Detail

JPopupMenu

public JPopupMenu()

Constructs a JPopupMenu without an "invoker".

JPopupMenu

public JPopupMenu(String label)

Constructs a JPopupMenu with the specified title.

Parameters:

label - the string that a UI may use to display as a title for the popup menu.

Method Detail

setDefaultLightWeightPopupEnabled

public static void setDefaultLightWeightPopupEnabled(boolean aFlag)

Sets the default value of the lightWeightPopupEnabled property.

Parameters:

aFlag - true if popups can be lightweight, otherwise false

See Also:

getDefaultLightWeightPopupEnabled(), setLightWeightPopupEnabled(boolean)

getDefaultLightWeightPopupEnabled

public static boolean getDefaultLightWeightPopupEnabled()

Gets the defaultLightWeightPopupEnabled property, which by default is true.

Returns:

the value of the defaultLightWeightPopupEnabled property

See Also:

setDefaultLightWeightPopupEnabled(boolean)

getUI

public PopupMenuUI getUI()

Returns the look and feel (L&F) object that renders this component.

Returns:

the PopupMenuUI object that renders this component

setUI

public void setUI(PopupMenuUI ui)

Sets the L&F object that renders this component.

Parameters:

ui - the new PopupMenuUI L&F object

See Also:

UIDefaults.getUI(javax.swing.JComponent)

updateUI

public void updateUI()

Resets the UI property to a value from the current look and feel.

Overrides:

updateUI in class JComponent

See Also:

JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the L&F class that renders this component.

Overrides:

getUIClassID in class JComponent

Returns:

the string "PopupMenuUI"

See Also:

JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

processFocusEvent

protected void processFocusEvent(FocusEvent evt)

Description copied from class: Component

Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.

This method is not called unless focus events are enabled for this component. Focus events are enabled when one of the following occurs:

• A FocusListener object is registered via addFocusListener.
• Focus events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.

Overrides:

processFocusEvent in class Component

Parameters:

evt - the focus event

See Also:

FocusEvent, FocusListener, Component.addFocusListener(java.awt.event.FocusListener), Component.enableEvents(long)

processKeyEvent

protected void processKeyEvent(KeyEvent evt)

Processes key stroke events such as mnemonics and accelerators.

Overrides:

processKeyEvent in class JComponent

Parameters:

evt - the key event to be processed

getSelectionModel

public SingleSelectionModel getSelectionModel()

Returns the model object that handles single selections.

Returns:

the selectionModel property

See Also:

SingleSelectionModel

setSelectionModel

public void setSelectionModel(SingleSelectionModel model)

Sets the model object to handle single selections.

Parameters:

model - the new SingleSelectionModel

See Also:

SingleSelectionModel

add

public JMenuItem add(JMenuItem menuItem)

Appends the specified menu item to the end of this menu.

Parameters:

menuItem - the JMenuItem to add

Returns:

the JMenuItem added

add

public JMenuItem add(String s)

Creates a new menu item with the specified text and appends it to the end of this menu.

Parameters:

s - the string for the menu item to be added

add

public JMenuItem add(Action a)

Appends a new menu item to the end of the menu which dispatches the specified Action object. As of JDK 1.3, this is no longer the preferred method for adding Actions to a container. Instead it is recommended to configure a control with an action using setAction, and then add that control directly to the Container.

Parameters:

a - the Action to add to the menu

Returns:

the new menu item

See Also:

Action

adjustPopupLocationToFitScreen

Point adjustPopupLocationToFitScreen(int xposition,
                                     int yposition)

Returns an point which has been adjusted to take into account of the desktop bounds, taskbar and multi-monitor configuration.

This adustment may be cancelled by invoking the application with -Djavax.swing.adjustPopupLocationToFit=false

createActionComponent

protected JMenuItem createActionComponent(Action a)

Factory method which creates the JMenuItem for Actions added to the JPopupMenu. As of JDK 1.3, this is no longer the preferred method, instead it is recommended to configure a control with an action using setAction, and then adding that control directly to the Container.

Parameters:

a - the Action for the menu item to be added

Returns:

the new menu item

Since:

1.3

See Also:

Action

createActionChangeListener

protected java.beans.PropertyChangeListener createActionChangeListener(JMenuItem b)

Returns a properly configured PropertyChangeListener which updates the control as changes to the Action occur. As of JDK 1.3, this is no longer the preferred method for adding Actions to a container. Instead it is recommended to configure a control with an action using setAction, and then add that control directly to the Container.

remove

public void remove(int pos)

Removes the component at the specified index from this popup menu.

Overrides:

remove in class Container

Parameters:

pos - the position of the item to be removed

Throws:

IllegalArgumentException - if the value of pos < 0, or if the value of pos is greater than the number of items

See Also:

Container.add(java.awt.Component)

setLightWeightPopupEnabled

public void setLightWeightPopupEnabled(boolean aFlag)

Sets the value of the lightWeightPopupEnabled property, which by default is true. By default, when a look and feel displays a popup, it can choose to use a lightweight (all-Java) popup. Lightweight popup windows are more efficient than heavyweight (native peer) windows, but lightweight and heavyweight components do not mix well in a GUI. If your application mixes lightweight and heavyweight components, you should disable lightweight popups. Some look and feels might always use heavyweight popups, no matter what the value of this property.

Parameters:

aFlag - false to disable lightweight popups

See Also:

isLightWeightPopupEnabled()

isLightWeightPopupEnabled

public boolean isLightWeightPopupEnabled()

Gets the lightWeightPopupEnabled property.

Returns:

the value of the lightWeightPopupEnabled property

See Also:

setLightWeightPopupEnabled(boolean)

getLabel

public String getLabel()

Returns the popup menu's label

Returns:

a string containing the popup menu's label

See Also:

setLabel(java.lang.String)

setLabel

public void setLabel(String label)

Sets the popup menu's label. Different look and feels may choose to display or not display this.

Parameters:

label - a string specifying the label for the popup menu

See Also:

setLabel(java.lang.String)

addSeparator

public void addSeparator()

Appends a new separator at the end of the menu.

insert

public void insert(Action a,
                   int index)

Inserts a menu item for the specified Action object at a given position.

Parameters:

a - the Action object to insert

index - specifies the position at which to insert the Action, where 0 is the first

Throws:

IllegalArgumentException - if index < 0

See Also:

Action

insert

public void insert(Component component,
                   int index)

Inserts the specified component into the menu at a given position.

Parameters:

component - the Component to insert

index - specifies the position at which to insert the component, where 0 is the first

Throws:

IllegalArgumentException - if index < 0

addPopupMenuListener

public void addPopupMenuListener(PopupMenuListener l)

Adds a PopupMenu listener.

Parameters:

l - the PopupMenuListener to add

removePopupMenuListener

public void removePopupMenuListener(PopupMenuListener l)

Removes a PopupMenu listener.

Parameters:

l - the PopupMenuListener to remove

getPopupMenuListeners

public PopupMenuListener[] getPopupMenuListeners()

Returns an array of all the PopupMenuListeners added to this JMenuItem with addPopupMenuListener().

Returns:

all of the PopupMenuListeners added or an empty array if no listeners have been added

Since:

1.4

firePopupMenuWillBecomeVisible

protected void firePopupMenuWillBecomeVisible()

Notifies PopupMenuListeners that this popup menu will become visible.

firePopupMenuWillBecomeInvisible

protected void firePopupMenuWillBecomeInvisible()

Notifies PopupMenuListeners that this popup menu will become invisible.

firePopupMenuCanceled

protected void firePopupMenuCanceled()

Notifies PopupMenuListeners that this popup menu is cancelled.

alwaysOnTop

boolean alwaysOnTop()

Always returns true since popups, by definition, should always be on top of all other windows.

Overrides:

alwaysOnTop in class JComponent

Returns:

true

pack

public void pack()

Lays out the container so that it uses the minimum space needed to display its contents.

setVisible

public void setVisible(boolean b)

Sets the visibility of the popup menu.

Overrides:

setVisible in class JComponent

Parameters:

b - true to make the popup visible, or false to hide it

getPopup

private Popup getPopup()

Returns a Popup instance from the PopupMenuUI that has had show invoked on it. If the current popup is non-null, this will invoke dispose of it, and then show the new one.

This does NOT fire any events, it is up the caller to dispatch the necessary events.

isVisible

public boolean isVisible()

Returns true if the popup menu is visible (currently being displayed).

Overrides:

isVisible in class Component

Returns:

true if the component is visible, false otherwise

See Also:

Component.setVisible(boolean)

setLocation

public void setLocation(int x,
                        int y)

Sets the location of the upper left corner of the popup menu using x, y coordinates.

Overrides:

setLocation in class Component

Parameters:

x - the x coordinate of the popup's new position

y - the y coordinate of the popup's new position

See Also:

Component.getLocation(), Component.setBounds(int, int, int, int)

isPopupMenu

private boolean isPopupMenu()

Returns true if the popup menu is a standalone popup menu rather than the submenu of a JMenu.

Returns:

true if this menu is a standalone popup menu, otherwise false

getInvoker

public Component getInvoker()

Returns the component which is the 'invoker' of this popup menu.

Returns:

the Component in which the popup menu is displayed

setInvoker

public void setInvoker(Component invoker)

Sets the invoker of this popup menu -- the component in which the popup menu menu is to be displayed.

Parameters:

invoker - the Component in which the popup menu is displayed

show

public void show(Component invoker,
                 int x,
                 int y)

Displays the popup menu at the position x,y in the coordinate space of the component invoker.

Parameters:

invoker - the component in whose space the popup menu is to appear

x - the x coordinate in invoker's coordinate space at which the popup menu is to be displayed

y - the y coordinate in invoker's coordinate space at which the popup menu is to be displayed

getRootPopupMenu

JPopupMenu getRootPopupMenu()

Returns the popup menu which is at the root of the menu system for this popup menu.

Returns:

the topmost grandparent JPopupMenu

getComponentAtIndex

public Component getComponentAtIndex(int i)

Deprecated. replaced by getComponent(int i)

Returns the component at the specified index.

Parameters:

i - the index of the component, where 0 is the first

Returns:

the Component at that index

getComponentIndex

public int getComponentIndex(Component c)

Returns the index of the specified component.

Parameters:

c - the Component to find

Returns:

the index of the component, where 0 is the first; or -1 if the component is not found

setPopupSize

public void setPopupSize(Dimension d)

Sets the size of the Popup window using a Dimension object. This is equivalent to setPreferredSize(d).

Parameters:

d - the Dimension specifying the new size of this component.

setPopupSize

public void setPopupSize(int width,
                         int height)

Sets the size of the Popup window to the specified width and height. This is equivalent to setPreferredSize(new Dimension(width, height)).

Parameters:

width - the new width of the Popup in pixels

height - the new height of the Popup in pixels

setSelected

public void setSelected(Component sel)

Sets the currently selected component, This will result in a change to the selection model.

Parameters:

sel - the Component to select

isBorderPainted

public boolean isBorderPainted()

Checks whether the border should be painted.

Returns:

true if the border is painted, false otherwise

See Also:

setBorderPainted(boolean)

setBorderPainted

public void setBorderPainted(boolean b)

Sets whether the border should be painted.

Parameters:

b - if true, the border is painted.

See Also:

isBorderPainted()

paintBorder

protected void paintBorder(Graphics g)

Paints the popup menu's border if the borderPainted property is true.

Overrides:

paintBorder in class JComponent

Parameters:

g - the Graphics object

See Also:

JComponent.paint(java.awt.Graphics), JComponent.setBorder(javax.swing.border.Border)

getMargin

public Insets getMargin()

Returns the margin, in pixels, between the popup menu's border and its containees.

Returns:

an Insets object containing the margin values.

isSubPopupMenu

boolean isSubPopupMenu(JPopupMenu popup)

Examines the list of menu items to determine whether popup is a popup menu.

Parameters:

popup - a JPopupMenu

Returns:

true if popup

getFrame

private static Frame getFrame(Component c)

paramString

protected String paramString()

Returns a string representation of this JPopupMenu. 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.

Overrides:

paramString in class JComponent

Returns:

a string representation of this JPopupMenu.

getAccessibleContext

public javax.accessibility.AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JPopupMenu. For JPopupMenus, the AccessibleContext takes the form of an AccessibleJPopupMenu. A new AccessibleJPopupMenu instance is created if necessary.

Specified by:

getAccessibleContext in interface javax.accessibility.Accessible

Overrides:

getAccessibleContext in class JComponent

Returns:

an AccessibleJPopupMenu that serves as the AccessibleContext of this JPopupMenu

writeObject

private void writeObject(ObjectOutputStream s)
                  throws IOException

Description copied from class: JComponent

Before writing a JComponent to an ObjectOutputStream we temporarily uninstall its UI. This is tricky to do because we want to uninstall the UI before any of the JComponent's children (or its LayoutManager etc.) are written, and we don't want to restore the UI until the most derived JComponent subclass has been been stored.

Throws:

IOException

readObject

private void readObject(ObjectInputStream s)
                 throws IOException,
                        ClassNotFoundException

Description copied from class: JComponent

We use the ObjectInputStream "registerValidation" callback to update the UI for the entire tree of components after they've all been read in.

Throws:

IOException

ClassNotFoundException

processMouseEvent

public void processMouseEvent(MouseEvent event,
                              MenuElement[] path,
                              MenuSelectionManager manager)

This method is required to conform to the MenuElement interface, but it not implemented.

Specified by:

processMouseEvent in interface MenuElement

See Also:

MenuElement.processMouseEvent(MouseEvent, MenuElement[], MenuSelectionManager)

processKeyEvent

public void processKeyEvent(KeyEvent e,
                            MenuElement[] path,
                            MenuSelectionManager manager)

This method is required to conform to the MenuElement interface, but it not implemented.

Specified by:

processKeyEvent in interface MenuElement

See Also:

MenuElement.processKeyEvent(KeyEvent, MenuElement[], MenuSelectionManager)

menuSelectionChanged

public void menuSelectionChanged(boolean isIncluded)

Messaged when the menubar selection changes to activate or deactivate this menu. This implements the javax.swing.MenuElement interface. Overrides MenuElement.menuSelectionChanged.

Specified by:

menuSelectionChanged in interface MenuElement

Parameters:

isIncluded - true if this menu is active, false if it is not

See Also:

MenuElement.menuSelectionChanged(boolean)

getSubElements

public MenuElement[] getSubElements()

Returns an array of MenuElements containing the submenu for this menu component. It will only return items conforming to the JMenuElement interface. If popup menu is null returns an empty array. This method is required to conform to the MenuElement interface.

Specified by:

getSubElements in interface MenuElement

Returns:

an array of MenuElement objects

See Also:

MenuElement.getSubElements()

getComponent

public Component getComponent()

Returns this JPopupMenu component.

Specified by:

getComponent in interface MenuElement

Returns:

this JPopupMenu object

See Also:

MenuElement.getComponent()

isPopupTrigger

public boolean isPopupTrigger(MouseEvent e)

Returns true if the MouseEvent is considered a popup trigger by the JPopupMenu's currently installed UI.

Returns:

true if the mouse event is a popup trigger

Since:

1.3