change draging sensitivity of ccui.PageView

smoothpv.lua

-- add dragging sensitive of the ccui.Pageview
function smoothpv(pageview, n)
    n = n or 8
    local pagen = #pageview:getPages()
    for i = 0, pagen-1 do
        local page = pageview:getPage(i)
        page:addTouchEventListener(function(sender, e) 
            if e ~= ccui.TouchEventType.canceled then 
                return 
            end
            local s = page:getContentSize()
            local x, y = page:getPosition()
            if s.width/2 > x and x > s.width/n and i > 0 then
                pageview:scrollToPage(i-1)
            elseif -s.width/2 < x and x < -s.width/n and i < pagen-1 then
                pageview:scrollToPage(i+1)
            end
        end)
    end
end