java.lang.Object
- com.vaadin.flow.component.Component
- - com.vaadin.flow.component.contextmenu.GeneratedVaadinContextMenu<C>
  - - com.vaadin.flow.component.contextmenu.ContextMenuBase<C,I,S>

Type Parameters:

C - the context-menu type

I - the menu-item type

S - the sub menu type

All Implemented Interfaces:

AttachNotifier, ClickNotifier<C>, DetachNotifier, HasComponents, HasElement, HasEnabled, HasStyle, Serializable

Direct Known Subclasses:

ContextMenu, GridContextMenu
```
@JsModule("./flow-component-renderer.js") @JsModule("./contextMenuConnector.js") @JsModule("./contextMenuTargetConnector.js")
public abstract class ContextMenuBase<C extends ContextMenuBase<C,I,S>,I extends MenuItemBase<C,I,S>,S extends SubMenuBase<C,I,S>>
extends GeneratedVaadinContextMenu<C>
implements HasComponents
```
Base functionality for server-side components based on <vaadin-context-menu>. Classes extending this should provide API for adding items and handling events related to them. For basic example, see ContextMenu.

Author:

Vaadin Ltd.

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class ContextMenuBase.OpenedChangeEvent<C extends ContextMenuBase<C,?,?>>

Field Summary

Fields
Modifier and Type Field Description

static String EVENT_DETAIL

Constructor Summary

Constructors
Constructor Description

ContextMenuBase()
Creates an empty context menu.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(Component... components)`	Adds the given components into the context menu overlay.
`void`	`addComponentAtIndex(int index, Component component)`	Adds the given component into this context menu at the given index.
`I`	`addItem(Component component)`	Adds a new item component with the given component to the context menu overlay.
`I`	`addItem(String text)`	Adds a new item component with the given text content to the context menu overlay.
`Registration`	`addOpenedChangeListener(ComponentEventListener<ContextMenuBase.OpenedChangeEvent<C>> listener)`	Adds a listener for the `opened-changed` events fired by the web component.
`void`	`close()`	Closes this context menu if it is currently open.
`protected abstract MenuManager<C,I,S>`	`createMenuManager(SerializableRunnable contentReset)`	Creates a menu manager instance which contains logic to control the menu content.
`Stream<Component>`	`getChildren()`	Gets the child components of this component.
`List<I>`	`getItems()`	Gets the items added to this component (the children of this component that are instances of `MenuItem`).
`protected MenuManager<C,I,S>`	`getMenuManager()`	Gets the menu manager.
`Component`	`getTarget()`	Gets the target component of this context menu, or `null` if it doesn't have a target.
`boolean`	`isOpened()`	Gets the open state from the context menu.
`boolean`	`isOpenOnClick()`	Gets whether the context menu can be opened via left click.
`protected boolean`	`onBeforeOpenMenu(elemental.json.JsonObject eventDetail)`	Decides whether to open the menu when the `beforeOpenHandler(DomEvent)` is processed, sub-classes can easily override it and perform additional operations in this phase.
`void`	`remove(Component... components)`	Removes the given child components from this component.
`void`	`removeAll()`	Removes all of the child components.
`void`	`setOpenOnClick(boolean openOnClick)`	Determines the way for opening the context menu.
`void`	`setTarget(Component target)`	Sets the target component for this context menu.

Methods inherited from class com.vaadin.flow.component.contextmenu.GeneratedVaadinContextMenu
addClickListener, addClickShortcut, getCloseOnString, getListenOnJsonObject, getOpenOnString, getSelectorString, isOpenedBoolean, open, setCloseOn, setListenOn, setOpenOn, setSelector

Methods inherited from class com.vaadin.flow.component.Component
addListener, findAncestor, fireEvent, from, get, getElement, getEventBus, getId, getListeners, getLocale, getParent, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getUI, hasListener, isAttached, isTemplateMapped, isVisible, onAttach, onDetach, onEnabledStateChanged, scrollIntoView, set, setElement, setId, setVisible

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.vaadin.flow.component.AttachNotifier
addAttachListener

Methods inherited from interface com.vaadin.flow.component.DetachNotifier
addDetachListener

Methods inherited from interface com.vaadin.flow.component.HasComponents
add, add, addComponentAsFirst, remove

Methods inherited from interface com.vaadin.flow.component.HasElement
getElement

Methods inherited from interface com.vaadin.flow.component.HasEnabled
isEnabled, setEnabled

Methods inherited from interface com.vaadin.flow.component.HasStyle
addClassName, addClassNames, getClassName, getClassNames, getStyle, hasClassName, removeClassName, removeClassNames, setClassName, setClassName

- Field Detail
  - EVENT_DETAIL
```
public static final String EVENT_DETAIL
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ContextMenuBase
```
public ContextMenuBase()
```
    Creates an empty context menu.
- Method Detail
  - setTarget
```
public void setTarget(Component target)
```
    Sets the target component for this context menu.
    By default, the context menu can be opened with a right click or a long touch on the target component.
    
    Parameters:
    
    target - the target component for this context menu, can be null to remove the target
  - getTarget
```
public Component getTarget()
```
    Gets the target component of this context menu, or null if it doesn't have a target.
    
    Returns:
    
    the target component of this context menu
    
    See Also:
    
    setTarget(Component)
  - setOpenOnClick
```
public void setOpenOnClick(boolean openOnClick)
```
    Determines the way for opening the context menu.
    By default, the context menu can be opened with a right click or a long touch on the target component.
    
    Parameters:
    
    openOnClick - if true, the context menu can be opened with left click only. Otherwise the context menu follows the default behavior.
  - isOpenOnClick
```
public boolean isOpenOnClick()
```
    Gets whether the context menu can be opened via left click.
    By default, this will return false and context menu can be opened with a right click or a long touch on the target component.
    
    Returns:
    
    true if the context menu can be opened with left click only. Otherwise the context menu follows the default behavior.
  - close
```
public void close()
```
    Closes this context menu if it is currently open.
    
    Overrides:
    
    close in class GeneratedVaadinContextMenu<C extends ContextMenuBase<C,I,S>>
  - addItem
```
public I addItem(String text)
```
    Adds a new item component with the given text content to the context menu overlay.
    This is a convenience method for the use case where you have a list of highlightable MenuItems inside the overlay. If you want to configure the contents of the overlay without wrapping them inside MenuItems, or if you just want to add some non-highlightable components between the items, use the add(Component...) method.
    
    Parameters:
    
    text - the text content for the created menu item
    
    Returns:
    
    the created menu item
    
    See Also:
    
    add(Component...)
  - addItem
```
public I addItem(Component component)
```
    Adds a new item component with the given component to the context menu overlay.
    This is a convenience method for the use case where you have a list of highlightable MenuItems inside the overlay. If you want to configure the contents of the overlay without wrapping them inside MenuItems, or if you just want to add some non-highlightable components between the items, use the add(Component...) method.
    
    Parameters:
    
    component - the component to add to the created menu item
    
    Returns:
    
    the created menu item
    
    See Also:
    
    add(Component...)
  - add
```
public void add(Component... components)
```
    Adds the given components into the context menu overlay.
    For the common use case of having a list of high-lightable items inside the overlay, you can use the addItem(String) convenience methods instead.
    The added elements in the DOM will not be children of the <vaadin-context-menu> element, but will be inserted into an overlay that is attached into the <body>.
    
    Specified by:
    
    add in interface HasComponents
    
    Parameters:
    
    components - the components to add
    
    See Also:
    
    HasMenuItems.addItem(String, ComponentEventListener), HasMenuItems.addItem(Component, ComponentEventListener)
  - remove
```
public void remove(Component... components)
```
    Description copied from interface: HasComponents
    
    Removes the given child components from this component.
    
    Specified by:
    
    remove in interface HasComponents
    
    Parameters:
    
    components - the components to remove
  - removeAll
```
public void removeAll()
```
    Removes all of the child components. This also removes all the items added with addItem(String) and its overload methods.
    
    Specified by:
    
    removeAll in interface HasComponents
  - addComponentAtIndex
```
public void addComponentAtIndex(int index,
                                Component component)
```
    Adds the given component into this context menu at the given index.
    The added elements in the DOM will not be children of the <vaadin-context-menu> element, but will be inserted into an overlay that is attached into the <body>.
    
    Specified by:
    
    addComponentAtIndex in interface HasComponents
    
    Parameters:
    
    index - the index, where the component will be added
    
    component - the component to add
    
    See Also:
    
    add(Component...)
  - getChildren
```
public Stream<Component> getChildren()
```
    Gets the child components of this component. This includes components added with add(Component...) and the MenuItem components created with addItem(String) and its overload methods. This doesn't include the components added to the sub menus of this context menu.
    
    Overrides:
    
    getChildren in class Component
    
    Returns:
    
    the child components of this component
    
    See Also:
    
    Id
  - getItems
```
public List<I> getItems()
```
    Gets the items added to this component (the children of this component that are instances of MenuItem). This doesn't include the components added to the sub menus of this context menu.
    
    Returns:
    
    the MenuItem components in this context menu
    
    See Also:
    
    addItem(String)
  - isOpened
```
public boolean isOpened()
```
    Gets the open state from the context menu.
    
    Returns:
    
    the opened property from the context menu
  - addOpenedChangeListener
```
public Registration addOpenedChangeListener(ComponentEventListener<ContextMenuBase.OpenedChangeEvent<C>> listener)
```
    Adds a listener for the opened-changed events fired by the web component.
    
    Overrides:
    
    addOpenedChangeListener in class GeneratedVaadinContextMenu<C extends ContextMenuBase<C,I,S>>
    
    Parameters:
    
    listener - the listener to add
    
    Returns:
    
    a Registration for removing the event listener
  - getMenuManager
```
protected MenuManager<C,I,S> getMenuManager()
```
    Gets the menu manager.
    
    Returns:
    
    the menu manager
  - createMenuManager
```
protected abstract MenuManager<C,I,S> createMenuManager(SerializableRunnable contentReset)
```
    Creates a menu manager instance which contains logic to control the menu content.
    
    Parameters:
    
    contentReset - callback to reset the menu content
    
    Returns:
    
    a new menu manager instance
  - onBeforeOpenMenu
```
protected boolean onBeforeOpenMenu(elemental.json.JsonObject eventDetail)
```
    Decides whether to open the menu when the beforeOpenHandler(DomEvent) is processed, sub-classes can easily override it and perform additional operations in this phase.
    The event details are completely specified by the target component that is in charge of defining the data it sends to the server. Based on this information, this method enables for dynamically modifying the contents of the context menu. Furthermore, this method's return value specifies if the context menu will be opened.
    
    Parameters:
    
    eventDetail - the client side event details provided by the target component.
    
    Returns:
    
    true if the context menu should be opened, false otherwise.

Class ContextMenuBase<C extends ContextMenuBase<C,​I,​S>,​I extends MenuItemBase<C,​I,​S>,​S extends SubMenuBase<C,​I,​S>>

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class com.vaadin.flow.component.contextmenu.GeneratedVaadinContextMenu

Methods inherited from class com.vaadin.flow.component.Component

Methods inherited from class java.lang.Object

Methods inherited from interface com.vaadin.flow.component.AttachNotifier

Methods inherited from interface com.vaadin.flow.component.DetachNotifier

Methods inherited from interface com.vaadin.flow.component.HasComponents

Methods inherited from interface com.vaadin.flow.component.HasElement

Methods inherited from interface com.vaadin.flow.component.HasEnabled

Methods inherited from interface com.vaadin.flow.component.HasStyle

Field Detail

EVENT_DETAIL

Constructor Detail

ContextMenuBase

Method Detail

setTarget

getTarget

setOpenOnClick

isOpenOnClick

close

addItem

addItem

add

remove

removeAll

addComponentAtIndex

getChildren

getItems

isOpened

addOpenedChangeListener

getMenuManager

createMenuManager

onBeforeOpenMenu

Class ContextMenuBase<C extends ContextMenuBase<C,I,S>,I extends MenuItemBase<C,I,S>,S extends SubMenuBase<C,I,S>>