【界面UI】拍卖行界面：出价流程与截拍提醒

---拍卖行的出价：加价规则与提交
AuctionUI.item = nil

function AuctionUI.show(item)
    AuctionUI.item = item
    GUI:Text_Create(AuctionUI.win, "cur", 10, 8, 14,
        "#FFD700",
        "当前出价：" .. AuctionUI.thousand(item.price))
    local btn = GUI:Button_Create(AuctionUI.win, "bid",
        10, 160)
    GUI:Button_setTitleText(btn, "加价 " ..
        AuctionUI.thousand(item.step))
    GUI:addOnClickEvent(btn, function()
        local newPrice = AuctionUI.current + item.step
        SL:SendNetMsg(MSGID.AUCTION_BID, item.id,
            newPrice, 0, "")
    end)
end

---截拍的倒计时：30 秒内的红色预警
SL:RegisterLuaNetMsg("AUCTION_END", function(data)
    local d = SL:JsonDecode(data)
    if not d then return end
    if d.winner == SL.myName() then
        SL:ShowSystemTips("恭喜！成功拍得 " .. d.item)
        SL:PlayAudio(2060)
    elseif AuctionUI.joined[d.id] then
        SL:ShowSystemTips("惜败，" .. d.winner ..
            " 以 " .. d.price .. " 金币截拍")
    end
end)

---截拍前的临门提醒
SL:Schedule(1.0, function()
    local item = AuctionUI.item
    if not item then return end
    local left = item.endAt - os.time()
    if left == 30 then
        SL:ShowSystemTips("拍卖还剩 30 秒！")
    end
end)