97 lines
2.5 KiB
CoffeeScript
97 lines
2.5 KiB
CoffeeScript
class Travis.ToTop
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# NOTE: I could have probably extract fixed positioning from
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# Tailing, but then I would need to parametrize positionElement
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# function to make it flexible to handle both cases. In that
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# situation I prefer a bit less DRY code over simplicity of
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# the calculations.
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constructor: (@window, @element_selector, @container_selector) ->
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@position = @window.scrollTop()
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@window.scroll( $.throttle( 200, @onScroll.bind(this) ) )
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this
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element: ->
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$(@element_selector)
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container: ->
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$(@container_selector)
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onScroll: ->
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@positionElement()
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positionElement: ->
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element = @element()
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container = @container()
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return if element.length is 0
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containerHeight = container.outerHeight()
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windowHeight = @window.height()
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offset = container.offset().top + containerHeight - (@window.scrollTop() + windowHeight)
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max = containerHeight - windowHeight
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offset = max if offset > max
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if offset > 0
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element.css(bottom: offset + 4)
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else
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element.css(bottom: 2)
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class @Travis.Tailing
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options:
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timeout: 200
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tail: ->
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$(@tail_selector)
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log: ->
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$(@log_selector)
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constructor: (@window, @tail_selector, @log_selector) ->
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@position = @window.scrollTop()
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@window.scroll( $.throttle( 200, @onScroll.bind(this) ) )
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this
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run: ->
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@autoScroll()
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@positionButton()
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Ember.run.later(@run.bind(this), @options.timeout) if @active()
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toggle: ->
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if @active() then @stop() else @start()
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active: ->
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@tail().hasClass('active')
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start: ->
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@tail().addClass('active')
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@run()
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stop: ->
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@tail().removeClass('active')
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autoScroll: ->
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return false unless @active()
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logBottom = @log().offset().top + @log().outerHeight() + 40
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winBottom = @window.scrollTop() + @window.height()
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if logBottom - winBottom > 0
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@window.scrollTop(logBottom - @window.height())
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true
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else
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false
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onScroll: ->
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@positionButton()
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position = @window.scrollTop()
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@stop() if position < @position
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@position = position
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positionButton: ->
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return if @tail().length is 0
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offset = @window.scrollTop() - @log().offset().top
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max = @log().height() - @tail().height() + 5
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if offset > 0 && offset <= max
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@tail().removeClass('bottom')
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@tail().addClass('scrolling')
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else
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if offset > max
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@tail().addClass('bottom')
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else
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@tail().removeClass('bottom')
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@tail().removeClass('scrolling')
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