type MenubarState ui.IDMenubarState is caller-owned top-level popup state. Its zero value is closed; a nonzero value is the stable ID of the active trigger.
MenubarHover#func MenubarHover(state MenubarState, trigger ui.ID, now time.Time, intent *HoverIntent, delay time.Duration) (MenubarState, time.Duration)MenubarHover advances the menubar's hover switch: while a menu is open, resting on another trigger opens that trigger's menu after delay. With no open menu, or with the pointer on the open trigger, it does nothing. It returns the state and the wait before asking again.
MenubarKeyDown#func MenubarKeyDown(current ui.ID, triggers []MenubarTrigger, open MenubarState, direction Direction, key ui.Key) (MenubarState, ui.ID, bool)MenubarKeyDown moves the menubar's keyboard focus and, while a menu is open, switches the open menu with it. Left and Right move between triggers with wrapping (reversed in RTL), Home and End go to the ends, Down/Enter/Space open the focused trigger, and Escape closes the open menu and returns to its trigger. Items inside the open menu are the caller's to focus after an open.
ActiveID#func (state MenubarState) ActiveID() ui.IDActiveID returns the open trigger ID, or zero when the menubar is closed.
Close#func (MenubarState) Close() MenubarStateClose returns the state with no active popup.
Dismiss#func (MenubarState) Dismiss() MenubarStateDismiss closes the active popup after selection or a dismiss action.
Escape#func (MenubarState) Escape() MenubarStateEscape closes the active popup after the runtime routes an Escape key press.
IsOpen#func (state MenubarState) IsOpen() boolIsOpen reports whether any top-level menu is open.
IsOpenFor#func (state MenubarState) IsOpenFor(triggerID ui.ID) boolIsOpenFor reports whether triggerID owns the open popup.
Open#func (state MenubarState) Open(triggerID ui.ID) MenubarStateOpen returns the state with triggerID active. Zero IDs are ignored.
OutsidePress#func (MenubarState) OutsidePress() MenubarStateOutsidePress closes the active popup after the runtime identifies an outside press.
Toggle#func (state MenubarState) Toggle(triggerID ui.ID) MenubarStateToggle closes the active trigger or opens a different nonzero trigger.