【界面UI】血条预警：低血量的呼吸提醒样式

-- 血条预警：呼吸闪烁
local panel = GUI:GetParent("MainTop")
local hpBar = GUI:LoadingBar_Create(panel, "HpWarnBar", 20, 40, "hp_bar", 0)
local breatheTimer
local function startBreathe(fast)
    local visible = true
    breatheTimer = SL:Schedule(function()
        visible = not visible
        hpBar:SetVisible(visible)
    end, fast and 200 or 500)
end
local function stopBreathe()
    if breatheTimer then SL:UnSchedule(breatheTimer) end
    hpBar:SetVisible(true)
end

-- 血条预警：阈值联动
local player = class(actor)
local curLevel = 0
local function onHpChange(player, hpPct)
    local newLevel = hpPct < 15 and 2 or (hpPct < 30 and 1 or 0)
    if newLevel == curLevel then return end
    if newLevel > 0 then
        stopBreathe()
        startBreathe(newLevel == 2)
    else
        stopBreathe()
    end
    curLevel = newLevel
end