TableView scroll event offset on Android , Appcelerator Titanium

list.coffee

# NOT FINISHED
# It works, but not good, for such transformation waiting hyperloop 

topOffset = 30
previousOffset  = 0
previousFirstVisibleItem  = 0
previousOffsetY = 30
previousMoveDirection = "down"

upCounter = 0
downCounter = 0
$.eventTable.addEventListener 'scroll', (event) ->
#    Ti.API.info "scroll:"
    firstVisibleView = $.eventList?.data?[0].rows[event.firstVisibleItem].children[0]
    moveDirection = "down"
    pointOnWindow = firstVisibleView.convertPointToView firstVisibleView.rect, $.eventList

    if event.firstVisibleItem < 3
        Alloy.Globals.topPane.opacity           = 1
        Alloy.Globals.calendarPane.opacity      = 1
        Alloy.Globals.eventsContainer.top       = 120
    else if pointOnWindow
        currentFirstVisibleItem = event.firstVisibleItem
        currentOffsetY = pointOnWindow.y
        currentOffset  = 0
        currentOffset = Math.abs(currentOffsetY) + topOffset    if currentOffsetY < 0
        currentOffset = topOffset - Math.abs(currentOffsetY)    if currentOffsetY > 0


        # not true, just for comparation, for better acurase sum all (rect.heights + top)
        currentTotalOffset  = 5000*currentFirstVisibleItem + currentOffset
        previousTotalOffset = 5000*previousFirstVisibleItem + previousOffset
        if currentTotalOffset < previousTotalOffset
            moveDirection = "up"
        else if currentTotalOffset > previousTotalOffset
            moveDirection = "down"
        else
            moveDirection = previousMoveDirection

        offsetDiff = Math.abs(currentOffset - previousOffset)


#        Ti.API.debug "#{if skipCalc then "[SKIPPED]" else ""}#{moveDirection.toUpperCase()} | #{previousOffsetY} -> #{currentOffsetY} ]===[#{currentOffset} -- #{offsetDiff} --- [#{currentTotalOffset } || #{previousTotalOffset}]" if Alloy.Globals.isDebug

        savePreviousMoveDirection   = previousMoveDirection
        previousOffsetY             = currentOffsetY
        previousOffset              = currentOffset
        previousMoveDirection       = moveDirection
        previousFirstVisibleItem    = currentFirstVisibleItem


        currentTop = parseInt Alloy.Globals.eventsContainer.top
        currentTopPaneOpacity = Alloy.Globals.topPane.opacity
#        Ti.API.debug "#{currentTop} - #{currentTopPaneOpacity} " if Alloy.Globals.isDebug

        if (moveDirection is "up")
            upCounter++
            downCounter = 0 if upCounter > 2 # filter 'bad' events

            Ti.API.debug ":::::::::::::::#{moveDirection.toUpperCase()} #{downCounter < upCounter} : #{currentTopPaneOpacity} : #{currentTotalOffset}" if Alloy.Globals.isDebug

            if downCounter < upCounter
                if currentTopPaneOpacity < 1
                    opacity = Math.min((currentTopPaneOpacity + 0.12), 1)
                    Alloy.Globals.topPane.opacity   = opacity
                    Alloy.Globals.calendarPane.opacity      = opacity
                if currentTopPaneOpacity > 0.8
                    Alloy.Globals.eventsContainer.top   = 120 if currentTop isnt 120
    #                Alloy.Globals.eventsContainer.top = Math.min((currentTop + 20), 120) if currentTop < 120
            else
                previousMoveDirection = savePreviousMoveDirection

        else if (moveDirection is "down")
            downCounter++
            upCounter = 0 if downCounter > 2 # filter 'bad' events

            Ti.API.debug ":::::::::::::::#{moveDirection.toUpperCase()} #{upCounter < downCounter} : #{currentTopPaneOpacity} : #{currentTotalOffset}" if Alloy.Globals.isDebug

            if upCounter < downCounter
                if currentTopPaneOpacity <= 1
                    opacity = Math.max((currentTopPaneOpacity - 0.12), 0)
                    Alloy.Globals.topPane.opacity   = opacity
                    Alloy.Globals.calendarPane.opacity      = opacity

                if currentTopPaneOpacity < 0.3
                    Alloy.Globals.eventsContainer.top   = 0 if currentTop isnt 0
    #                Alloy.Globals.eventsContainer.top   = Math.max((currentTop - 20), 0) if currentTop <= 120
            else
                previousMoveDirection = savePreviousMoveDirection
    else
        moveDirection = previousMoveDirection
        Ti.API.debug "#{moveDirection} : #{previousOffsetY} -> #{currentOffsetY}" if Alloy.Globals.isDebug

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