冷却环：转完一圈才能再出手

fx-cooldown

local CooldownRing = {}
local CONST = { KEY = "CooldownRing" }

function CooldownRing.Start(myID, duration)
    CooldownRing._total = duration
    CooldownRing._left = duration
    CooldownRing._node = CreateRingNode(myID)
    CooldownRing._sched = SL:Schedule(function(dt)
        CooldownRing:Update(dt)
    end, 0.02)
end

function CooldownRing:Update(dt)
    self._left = self._left - dt
    if self._left <= 0 then
        SL:UnSchedule(self._sched)
        self._node:FlashReady()
        return
    end
    local ratio = 1 - self._left / self._total
    self._node:SetFillRatio(ratio)
    self._node:SetText(math.ceil(self._left) .. 's')
end

return CooldownRing