class app.views.SidebarHover extends app.View  @itemClass: '_list-hover'   @events:    focus:     'onFocus'    blur:      'onBlur'    mouseover: 'onMouseover'    mouseout:  'onMouseout'    scroll:    'onScroll'    click:     'onClick'   @routes:    after: 'onRoute'   constructor: (@el) ->    unless isPointerEventsSupported()      delete @constructor.events.mouseover    super   show: (el) ->    unless el is @cursor      @hide()      if @isTarget(el) and @isTruncated(el.lastElementChild or el)        @cursor = el        @clone = @makeClone @cursor        $.append document.body, @clone        @offsetTop ?= @el.offsetTop        @position()    return   hide: ->    if @cursor      $.remove @clone      @cursor = @clone = null    return   position: =>    if @cursor      rect = $.rect(@cursor)      if rect.top >= @offsetTop        @clone.style.top = rect.top + 'px'        @clone.style.left = rect.left + 'px'      else        @hide()    return   makeClone: (el) ->    clone = el.cloneNode(true)    clone.classList.add 'clone'    clone   isTarget: (el) ->    el?.classList?.contains @constructor.itemClass   isSelected: (el) ->    el.classList.contains 'active'   isTruncated: (el) ->    el.scrollWidth > el.offsetWidth   onFocus: (event) =>    @focusTime = Date.now()    @show event.target    return   onBlur: =>    @hide()    return   onMouseover: (event) =>    if @isTarget(event.target) and not @isSelected(event.target) and @mouseActivated()      @show event.target    return   onMouseout: (event) =>    if @isTarget(event.target) and @mouseActivated()      @hide()    return   mouseActivated: ->    # Skip mouse events caused by focus events scrolling the sidebar.    not @focusTime or Date.now() - @focusTime > 500   onScroll: =>    @position()    return   onClick: (event) =>    if event.target is @clone      $.click @cursor    return   onRoute: =>    @hide()    return isPointerEventsSupported = ->  el = document.createElement 'div'  el.style.cssText = 'pointer-events: auto'  el.style.pointerEvents is 'auto'