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Menu

Class MenuBar

A widget which displays menus as a canonical menu bar. The namespace for the MenuBar class statics.

Hierarchy

Implements

  • IMessageHandler
  • IObservableDisposable

Index

Constructors

constructor

Properties

Private _activeIndex

_activeIndex: number = -1

Private _childMenu

_childMenu: Menu | null = null

Private _menus

_menus: Menu[] = []

node

node: HTMLElement

Get the DOM node owned by the widget.

renderer

renderer: IRenderer

The renderer used by the menu bar.

Static defaultRenderer

defaultRenderer: Renderer = new Renderer()

The default Renderer instance.

Accessors

activeIndex

  • get activeIndex(): number
  • set activeIndex(value: number): void
  • Get the index of the currently active menu.

    Notes

    This will be -1 if no menu is active.

    Returns number

  • Set the index of the currently active menu.

    Notes

    If the menu cannot be activated, the index will be set to -1.

    Parameters

    • value: number

    Returns void

activeMenu

  • get activeMenu(): Menu | null
  • set activeMenu(value: Menu | null): void
  • Get the currently active menu.

    Notes

    If the menu does not exist, the menu will be set to null.

    Returns Menu | null

  • Set the currently active menu.

    Notes

    If the menu does not exist, the menu will be set to null.

    Parameters

    • value: Menu | null

    Returns void

childMenu

  • get childMenu(): Menu | null
  • The child menu of the menu bar.

    Notes

    This will be null if the menu bar does not have an open menu.

    Returns Menu | null

contentNode

  • get contentNode(): HTMLUListElement
  • Get the menu bar content node.

    Notes

    This is the node which holds the menu title nodes.

    Modifying this node directly can lead to undefined behavior.

    Returns HTMLUListElement

dataset

  • get dataset(): DOMStringMap

disposed

  • get disposed(): ISignal<this, void>
  • A signal emitted when the widget is disposed.

    Returns ISignal<this, void>

id

  • get id(): string
  • set id(value: string): void
  • Get the id of the widget's DOM node.

    Returns string

  • Set the id of the widget's DOM node.

    Parameters

    • value: string

    Returns void

isAttached

  • get isAttached(): boolean

isDisposed

  • get isDisposed(): boolean

isHidden

  • get isHidden(): boolean

isVisible

  • get isVisible(): boolean
  • Test whether the widget is visible.

    Notes

    A widget is visible when it is attached to the DOM, is not explicitly hidden, and has no explicitly hidden ancestors.

    Returns boolean

layout

  • get layout(): Layout | null
  • set layout(value: Layout | null): void
  • Get the layout for the widget.

    Notes

    The layout is single-use only. It cannot be changed after the first assignment.

    The layout is disposed automatically when the widget is disposed.

    Returns Layout | null

  • Set the layout for the widget.

    Notes

    The layout is single-use only. It cannot be changed after the first assignment.

    The layout is disposed automatically when the widget is disposed.

    Parameters

    Returns void

menus

  • get menus(): ReadonlyArray<Menu>
  • A read-only array of the menus in the menu bar.

    Returns ReadonlyArray<Menu>

parent

  • get parent(): Widget | null
  • set parent(value: Widget | null): void
  • Get the parent of the widget.

    Notes

    Children are typically added to a widget by using a layout, which means user code will not normally set the parent widget directly.

    The widget will be automatically removed from its old parent.

    This is a no-op if there is no effective parent change.

    Returns Widget | null

  • Set the parent of the widget.

    Notes

    Children are typically added to a widget by using a layout, which means user code will not normally set the parent widget directly.

    The widget will be automatically removed from its old parent.

    This is a no-op if there is no effective parent change.

    Parameters

    Returns void

title

  • The title object for the widget.

    Notes

    The title object is used by some container widgets when displaying the widget alongside some title, such as a tab panel or side bar.

    Since not all widgets will use the title, it is created on demand.

    The owner property of the title is set to this widget.

    Returns Title<Widget>

Methods

Private _closeChildMenu

  • _closeChildMenu(): void
  • Close the child menu immediately.

    This is a no-op if a child menu is not open.

    Returns void

Private _evtKeyDown

  • _evtKeyDown(event: KeyboardEvent): void
  • Handle the 'keydown' event for the menu bar.

    Parameters

    • event: KeyboardEvent

    Returns void

Private _evtMouseDown

  • _evtMouseDown(event: MouseEvent): void
  • Handle the 'mousedown' event for the menu bar.

    Parameters

    • event: MouseEvent

    Returns void

Private _evtMouseLeave

  • _evtMouseLeave(event: MouseEvent): void
  • Handle the 'mouseleave' event for the menu bar.

    Parameters

    • event: MouseEvent

    Returns void

Private _evtMouseMove

  • _evtMouseMove(event: MouseEvent): void
  • Handle the 'mousemove' event for the menu bar.

    Parameters

    • event: MouseEvent

    Returns void

Private _onMenuAboutToClose

  • _onMenuAboutToClose(sender: Menu): void
  • Handle the aboutToClose signal of a menu.

    Parameters

    Returns void

Private _onMenuMenuRequested

  • _onMenuMenuRequested(sender: Menu, args: "next" | "previous"): void
  • Handle the menuRequested signal of a child menu.

    Parameters

    • sender: Menu
    • args: "next" | "previous"

    Returns void

Private _onTitleChanged

  • _onTitleChanged(): void
  • Handle the changed signal of a title object.

    Returns void

Private _openChildMenu

  • _openChildMenu(): void
  • Open the child menu at the active index immediately.

    If a different child menu is already open, it will be closed, even if there is no active menu.

    Returns void

activate

  • activate(): void
  • Post an 'activate-request' message to the widget.

    Notes

    This is a simple convenience method for posting the message.

    Returns void

addClass

  • addClass(name: string): void
  • Add a class name to the widget's DOM node.

    Parameters

    • name: string

      The class name to add to the node.

      Notes

      If the class name is already added to the node, this is a no-op.

      The class name must not contain whitespace.

    Returns void

addMenu

  • addMenu(menu: Menu): void
  • Add a menu to the end of the menu bar.

    Parameters

    • menu: Menu

      The menu to add to the menu bar.

      Notes

      If the menu is already added to the menu bar, it will be moved.

    Returns void

children

  • children(): IIterator<Widget>
  • Create an iterator over the widget's children.

    Returns IIterator<Widget>

    A new iterator over the children of the widget.

    Notes

    The widget must have a populated layout in order to have children.

    If a layout is not installed, the returned iterator will be empty.

clearFlag

  • clearFlag(flag: Flag): void
  • Clear the given widget flag.

    Notes

    This will not typically be called directly by user code.

    Parameters

    Returns void

clearMenus

  • clearMenus(): void
  • Remove all menus from the menu bar.

    Returns void

close

  • close(): void
  • Send a 'close-request' message to the widget.

    Notes

    This is a simple convenience method for sending the message.

    Returns void

contains

  • contains(widget: Widget): boolean
  • Test whether a widget is a descendant of this widget.

    Parameters

    • widget: Widget

      The descendant widget of interest.

    Returns boolean

    true if the widget is a descendant, false otherwise.

dispose

  • dispose(): void

fit

  • fit(): void
  • Post a 'fit-request' message to the widget.

    Notes

    This is a simple convenience method for posting the message.

    Returns void

handleEvent

  • handleEvent(event: Event): void
  • Handle the DOM events for the menu bar.

    Parameters

    • event: Event

      The DOM event sent to the menu bar.

      Notes

      This method implements the DOM EventListener interface and is called in response to events on the menu bar's DOM nodes. It should not be called directly by user code.

    Returns void

hasClass

  • hasClass(name: string): boolean
  • Test whether the widget's DOM node has the given class name.

    Parameters

    • name: string

      The class name of interest.

    Returns boolean

    true if the node has the class, false otherwise.

hide

  • hide(): void
  • Hide the widget and make it hidden to its parent widget.

    Notes

    This causes the isHidden property to be true.

    If the widget is explicitly hidden, this is a no-op.

    Returns void

insertMenu

  • insertMenu(index: number, menu: Menu): void
  • Insert a menu into the menu bar at the specified index.

    Parameters

    • index: number

      The index at which to insert the menu.

    • menu: Menu

      The menu to insert into the menu bar.

      Notes

      The index will be clamped to the bounds of the menus.

      If the menu is already added to the menu bar, it will be moved.

    Returns void

Protected notifyLayout

  • notifyLayout(msg: Message): void
  • Invoke the message processing routine of the widget's layout.

    Parameters

    • msg: Message

      The message to dispatch to the layout.

      Notes

      This is a no-op if the widget does not have a layout.

      This will not typically be called directly by user code.

    Returns void

Protected onActivateRequest

  • onActivateRequest(msg: Message): void

Protected onAfterAttach

  • onAfterAttach(msg: Message): void
  • A message handler invoked on an 'after-attach' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onAfterDetach

  • onAfterDetach(msg: Message): void

Protected onAfterHide

  • onAfterHide(msg: Message): void
  • A message handler invoked on an 'after-hide' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onAfterShow

  • onAfterShow(msg: Message): void
  • A message handler invoked on an 'after-show' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onBeforeAttach

  • onBeforeAttach(msg: Message): void

Protected onBeforeDetach

  • onBeforeDetach(msg: Message): void
  • A message handler invoked on a 'before-detach' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onBeforeHide

  • onBeforeHide(msg: Message): void
  • A message handler invoked on a 'before-hide' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onBeforeShow

  • onBeforeShow(msg: Message): void
  • A message handler invoked on a 'before-show' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onChildAdded

  • A message handler invoked on a 'child-added' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    Returns void

Protected onChildRemoved

Protected onCloseRequest

  • onCloseRequest(msg: Message): void
  • A message handler invoked on a 'close-request' message.

    Notes

    The default implementation unparents or detaches the widget.

    Parameters

    • msg: Message

    Returns void

Protected onFitRequest

  • onFitRequest(msg: Message): void
  • A message handler invoked on a 'fit-request' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    • msg: Message

    Returns void

Protected onResize

  • A message handler invoked on a 'resize' message.

    Notes

    The default implementation of this handler is a no-op.

    Parameters

    Returns void

Protected onUpdateRequest

  • onUpdateRequest(msg: Message): void

openActiveMenu

  • openActiveMenu(): void
  • Open the active menu and activate its first menu item.

    Notes

    If there is no active menu, this is a no-op.

    Returns void

processMessage

  • processMessage(msg: Message): void
  • Process a message sent to the widget.

    Parameters

    • msg: Message

      The message sent to the widget.

      Notes

      Subclasses may reimplement this method as needed.

    Returns void

removeClass

  • removeClass(name: string): void
  • Remove a class name from the widget's DOM node.

    Parameters

    • name: string

      The class name to remove from the node.

      Notes

      If the class name is not yet added to the node, this is a no-op.

      The class name must not contain whitespace.

    Returns void

removeMenu

  • removeMenu(menu: Menu): void
  • Remove a menu from the menu bar.

    Parameters

    • menu: Menu

      The menu to remove from the menu bar.

      Notes

      This is a no-op if the menu is not in the menu bar.

    Returns void

removeMenuAt

  • removeMenuAt(index: number): void
  • Remove the menu at a given index from the menu bar.

    Parameters

    • index: number

      The index of the menu to remove.

      Notes

      This is a no-op if the index is out of range.

    Returns void

setFlag

  • setFlag(flag: Flag): void
  • Set the given widget flag.

    Notes

    This will not typically be called directly by user code.

    Parameters

    Returns void

setHidden

  • setHidden(hidden: boolean): void
  • Show or hide the widget according to a boolean value.

    Parameters

    • hidden: boolean

      true to hide the widget, or false to show it.

      Notes

      This is a convenience method for hide() and show().

    Returns void

show

  • show(): void
  • Show the widget and make it visible to its parent widget.

    Notes

    This causes the isHidden property to be false.

    If the widget is not explicitly hidden, this is a no-op.

    Returns void

testFlag

  • testFlag(flag: Flag): boolean
  • Test whether the given widget flag is set.

    Notes

    This will not typically be called directly by user code.

    Parameters

    Returns boolean

toggleClass

  • toggleClass(name: string, force?: undefined | false | true): boolean
  • Toggle a class name on the widget's DOM node.

    Parameters

    • name: string

      The class name to toggle on the node.

    • Optional force: undefined | false | true

      Whether to force add the class (true) or force remove the class (false). If not provided, the presence of the class will be toggled from its current state.

    Returns boolean

    true if the class is now present, false otherwise.

    Notes

    The class name must not contain whitespace.

update

  • update(): void
  • Post an 'update-request' message to the widget.

    Notes

    This is a simple convenience method for posting the message.

    Returns void

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