tibia-client/modules/corelib/ui/effects.lua

-- @docclass
g_effects = {}

function g_effects.fadeIn(widget, time, elapsed)
  if not elapsed then elapsed = 0 end
  if not time then time = 300 end
  widget:setOpacity(math.min(elapsed/time, 1))
  removeEvent(widget.fadeEvent)
  if elapsed < time then
    removeEvent(widget.fadeEvent)
    widget.fadeEvent = scheduleEvent(function()
      g_effects.fadeIn(widget, time, elapsed + 30)
    end, 30)
  else
    widget.fadeEvent = nil
  end
end

function g_effects.fadeOut(widget, time, elapsed)
  if not elapsed then elapsed = 0 end
  if not time then time = 300 end
  elapsed = math.max((1 - widget:getOpacity()) * time, elapsed)
  removeEvent(widget.fadeEvent)
  widget:setOpacity(math.max((time - elapsed)/time, 0))
  if elapsed < time then
    widget.fadeEvent = scheduleEvent(function()
      g_effects.fadeOut(widget, time, elapsed + 30)
    end, 30)
  else
    widget.fadeEvent = nil
  end
end

function g_effects.cancelFade(widget)
  removeEvent(widget.fadeEvent)
  widget.fadeEvent = nil
end