com.vaadin.ui
Class MenuBar

java.lang.Object
  com.vaadin.server.AbstractClientConnector
      com.vaadin.ui.AbstractComponent
          com.vaadin.ui.MenuBar

All Implemented Interfaces:

ConnectorEventListener, MethodEventSource, ClientConnector, Sizeable, VariableOwner, com.vaadin.shared.Connector, Component, Component.Focusable, LegacyComponent, java.io.Serializable, java.util.EventListener

public class MenuBar
extends AbstractComponent
implements LegacyComponent, Component.Focusable

A class representing a horizontal menu bar. The menu can contain MenuItem objects, which in turn can contain more MenuBars. These sub-level MenuBars are represented as vertical menu.

See Also:

Serialized Form

Nested Class Summary

static interface	MenuBar.Command This interface contains the layer for menu commands of the MenuBar class.
class	MenuBar.MenuItem A composite class for menu items and sub-menus.

Nested classes/interfaces inherited from interface com.vaadin.ui.Component

Component.ErrorEvent, Component.Event, Component.Focusable, Component.Listener

Nested classes/interfaces inherited from interface com.vaadin.server.ClientConnector

ClientConnector.AttachEvent, ClientConnector.AttachListener, ClientConnector.ConnectorErrorEvent, ClientConnector.DetachEvent, ClientConnector.DetachListener

Nested classes/interfaces inherited from interface com.vaadin.server.Sizeable

Sizeable.Unit

Field Summary

Fields inherited from interface com.vaadin.server.Sizeable

SIZE_UNDEFINED, UNITS_CM, UNITS_EM, UNITS_EX, UNITS_INCH, UNITS_MM, UNITS_PERCENTAGE, UNITS_PICAS, UNITS_PIXELS, UNITS_POINTS

Constructor Summary

MenuBar()
Constructs an empty, horizontal menu

Method Summary

MenuBar.MenuItem	addItem(java.lang.String caption, MenuBar.Command command) Add a new item to the menu bar.
MenuBar.MenuItem	addItem(java.lang.String caption, Resource icon, MenuBar.Command command) Add a new item to the menu bar.
MenuBar.MenuItem	addItemBefore(java.lang.String caption, Resource icon, MenuBar.Command command, MenuBar.MenuItem itemToAddBefore) Add an item before some item.
void	changeVariables(java.lang.Object source, java.util.Map<java.lang.String,java.lang.Object> variables) Deserialize changes received from client.
void	focus() Sets the focus for this component if the component is Focusable.
java.util.List<MenuBar.MenuItem>	getItems() Returns a list with all the MenuItem objects in the menu bar
MenuBar.MenuItem	getMoreMenuItem() Get the MenuItem used as the collapse menu item.
int	getSize() Returns the size of the menu.
protected com.vaadin.shared.ui.menubar.MenuBarState	getState() Returns the shared state bean with information to be sent from the server to the client.
int	getTabIndex() Gets the tabulator index of the Focusable component.
boolean	isAutoOpen() Detects whether the menubar is in a mode where top level menus are automatically opened when the mouse cursor is moved over the menu.
boolean	isHtmlContentAllowed() Checks whether item captions are interpreted as html or plain text.
void	paintContent(PaintTarget target) Paint (serialise) the component for the client.
void	removeItem(MenuBar.MenuItem item) Remove first occurrence the specified item from the main menu
void	removeItems() Empty the menu bar
void	setAutoOpen(boolean autoOpenTopLevelMenu) Using this method menubar can be put into a special mode where top level menus opens without clicking on the menu, but automatically when mouse cursor is moved over the menu.
void	setHtmlContentAllowed(boolean htmlContentAllowed) Sets whether html is allowed in the item captions.
void	setMoreMenuItem(MenuBar.MenuItem item) Set the item that is used when collapsing the top level menu.
void	setTabIndex(int tabIndex) Sets the tabulator index of the Focusable component.

Methods inherited from class com.vaadin.ui.AbstractComponent

addListener, addShortcutListener, addStyleName, attach, beforeClientResponse, detach, findAncestor, fireComponentErrorEvent, fireComponentEvent, getActionManager, getCaption, getComponentError, getData, getDebugId, getDescription, getErrorMessage, getHeight, getHeightUnits, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getState, getStyleName, getWidth, getWidthUnits, isConnectorEnabled, isEnabled, isImmediate, isReadOnly, isVisible, removeListener, removeShortcutListener, removeStyleName, setCaption, setComponentError, setData, setDebugId, setDescription, setEnabled, setHeight, setHeight, setIcon, setId, setImmediate, setLocale, setParent, setPrimaryStyleName, setReadOnly, setSizeFull, setSizeUndefined, setStyleName, setVisible, setWidth, setWidth

Methods inherited from class com.vaadin.server.AbstractClientConnector

addAttachListener, addDetachListener, addExtension, addListener, addListener, addListener, addMethodInvocationToQueue, createState, encodeState, fireEvent, getAllChildrenIterable, getConnectorId, getErrorHandler, getExtensions, getListeners, getResource, getRpcManager, getRpcProxy, getSession, getStateType, getUI, handleConnectorRequest, hasListeners, isAttached, markAsDirty, markAsDirtyRecursive, registerRpc, registerRpc, removeAttachListener, removeDetachListener, removeExtension, removeListener, removeListener, removeListener, removeListener, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler, setResource

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.ui.LegacyComponent

markAsDirty

Methods inherited from interface com.vaadin.server.VariableOwner

isEnabled, isImmediate

Methods inherited from interface com.vaadin.ui.Component

addListener, addStyleName, attach, getCaption, getDescription, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getUI, isEnabled, isReadOnly, isVisible, removeListener, removeStyleName, setCaption, setEnabled, setIcon, setId, setParent, setPrimaryStyleName, setReadOnly, setStyleName, setVisible

Methods inherited from interface com.vaadin.server.ClientConnector

addAttachListener, addDetachListener, beforeClientResponse, detach, encodeState, getErrorHandler, getExtensions, getRpcManager, getStateType, handleConnectorRequest, isAttached, isConnectorEnabled, markAsDirtyRecursive, removeAttachListener, removeDetachListener, removeExtension, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler

Methods inherited from interface com.vaadin.shared.Connector

getConnectorId

Methods inherited from interface com.vaadin.server.Sizeable

getHeight, getHeightUnits, getWidth, getWidthUnits, setHeight, setHeight, setSizeFull, setSizeUndefined, setWidth, setWidth

Constructor Detail

MenuBar

public MenuBar()

Constructs an empty, horizontal menu

Method Detail

getState

protected com.vaadin.shared.ui.menubar.MenuBarState getState()

Description copied from class: AbstractComponent

Returns the shared state bean with information to be sent from the server to the client. Subclasses should override this method and set any relevant fields of the state returned by super.getState().

Overrides:

getState in class AbstractComponent

Returns:

updated component shared state

paintContent

public void paintContent(PaintTarget target)
                  throws PaintException

Paint (serialise) the component for the client.

Specified by:

paintContent in interface LegacyComponent

Parameters:

target - the target UIDL stream where the component should paint itself to.

Throws:

PaintException - if the paint operation failed.

changeVariables

public void changeVariables(java.lang.Object source,
                            java.util.Map<java.lang.String,java.lang.Object> variables)

Deserialize changes received from client.

Specified by:

changeVariables in interface VariableOwner

Parameters:

source - the Source of the variable change. This is the origin of the event. For example in Web Adapter this is the request.

variables - the Mapping from variable names to new variable values.

addItem

public MenuBar.MenuItem addItem(java.lang.String caption,
                                MenuBar.Command command)

Add a new item to the menu bar. Command can be null, but a caption must be given.

Parameters:

caption - the text for the menu item

command - the command for the menu item

Throws:

java.lang.IllegalArgumentException

addItem

public MenuBar.MenuItem addItem(java.lang.String caption,
                                Resource icon,
                                MenuBar.Command command)

Add a new item to the menu bar. Icon and command can be null, but a caption must be given.

Parameters:

caption - the text for the menu item

icon - the icon for the menu item

command - the command for the menu item

Throws:

java.lang.IllegalArgumentException

addItemBefore

public MenuBar.MenuItem addItemBefore(java.lang.String caption,
                                      Resource icon,
                                      MenuBar.Command command,
                                      MenuBar.MenuItem itemToAddBefore)

Add an item before some item. If the given item does not exist the item is added at the end of the menu. Icon and command can be null, but a caption must be given.

Parameters:

caption - the text for the menu item

icon - the icon for the menu item

command - the command for the menu item

itemToAddBefore - the item that will be after the new item

Throws:

java.lang.IllegalArgumentException

getItems

public java.util.List<MenuBar.MenuItem> getItems()

Returns a list with all the MenuItem objects in the menu bar

Returns:

a list containing the MenuItem objects in the menu bar

removeItem

public void removeItem(MenuBar.MenuItem item)

Remove first occurrence the specified item from the main menu

Parameters:

item - The item to be removed

removeItems

public void removeItems()

Empty the menu bar

getSize

public int getSize()

Returns the size of the menu.

Returns:

The size of the menu

setMoreMenuItem

public void setMoreMenuItem(MenuBar.MenuItem item)

Set the item that is used when collapsing the top level menu. All "overflowing" items will be added below this. The item command will be ignored. If set to null, the default item with a downwards arrow is used. The item command (if specified) is ignored.

Parameters:

item -

getMoreMenuItem

public MenuBar.MenuItem getMoreMenuItem()

Get the MenuItem used as the collapse menu item.

Returns:

setAutoOpen

public void setAutoOpen(boolean autoOpenTopLevelMenu)

Using this method menubar can be put into a special mode where top level menus opens without clicking on the menu, but automatically when mouse cursor is moved over the menu. In this mode the menu also closes itself if the mouse is moved out of the opened menu.

Note, that on touch devices the menu still opens on a click event.

Parameters:

autoOpenTopLevelMenu - true if menus should be opened without click, the default is false

isAutoOpen

public boolean isAutoOpen()

Detects whether the menubar is in a mode where top level menus are automatically opened when the mouse cursor is moved over the menu. Normally root menu opens only by clicking on the menu. Submenus always open automatically.

Returns:

true if the root menus open without click, the default is false

setHtmlContentAllowed

public void setHtmlContentAllowed(boolean htmlContentAllowed)

Sets whether html is allowed in the item captions. If set to true, the captions are passed to the browser as html and the developer is responsible for ensuring no harmful html is used. If set to false, the content is passed to the browser as plain text.

Parameters:

htmlContentAllowed - true if the captions are used as html, false if used as plain text

isHtmlContentAllowed

public boolean isHtmlContentAllowed()

Checks whether item captions are interpreted as html or plain text.

Returns:

true if the captions are used as html, false if used as plain text

See Also:

setHtmlContentAllowed(boolean)

getTabIndex

public int getTabIndex()

Description copied from interface: Component.Focusable

Gets the tabulator index of the Focusable component.

Specified by:

getTabIndex in interface Component.Focusable

Returns:

tab index set for the Focusable component

See Also:

Component.Focusable.setTabIndex(int)

setTabIndex

public void setTabIndex(int tabIndex)

Description copied from interface: Component.Focusable

Sets the tabulator index of the Focusable component. The tab index property is used to specify the order in which the fields are focused when the user presses the Tab key. Components with a defined tab index are focused sequentially first, and then the components with no tab index.

 Form loginBox = new Form();
 loginBox.setCaption("Login");
 layout.addComponent(loginBox);
 
 // Create the first field which will be focused
 TextField username = new TextField("User name");
 loginBox.addField("username", username);
 
 // Set focus to the user name
 username.focus();
 
 TextField password = new TextField("Password");
 loginBox.addField("password", password);
 
 Button login = new Button("Login");
 loginBox.getFooter().addComponent(login);
 
 // An additional component which natural focus order would
 // be after the button.
 CheckBox remember = new CheckBox("Remember me");
 loginBox.getFooter().addComponent(remember);
 
 username.setTabIndex(1);
 password.setTabIndex(2);
 remember.setTabIndex(3); // Different than natural place
 login.setTabIndex(4);
 

After all focusable user interface components are done, the browser can begin again from the component with the smallest tab index, or it can take the focus out of the page, for example, to the location bar.

If the tab index is not set (is set to zero), the default tab order is used. The order is somewhat browser-dependent, but generally follows the HTML structure of the page.

A negative value means that the component is completely removed from the tabulation order and can not be reached by pressing the Tab key at all.

Specified by:

setTabIndex in interface Component.Focusable

Parameters:

tabIndex - the tab order of this component. Indexes usually start from 1. Zero means that default tab order should be used. A negative value means that the field should not be included in the tabbing sequence.

See Also:

Component.Focusable.getTabIndex()

focus

public void focus()

Description copied from class: AbstractComponent

Sets the focus for this component if the component is Focusable.

Specified by:

focus in interface Component.Focusable

Overrides:

focus in class AbstractComponent

See Also:

FieldEvents, FieldEvents.FocusEvent, FieldEvents.FocusListener, FieldEvents.BlurEvent, FieldEvents.BlurListener