【界面UI】背包筛选器：按品质与类型的快速过滤

-- 背包筛选器：条件过滤
local panel = GUI:GetParent("BagPanel")
local filterQuality, filterType = 0, 0
local function renderFiltered(bagItems)
    local shown = 0
    for i, item in ipairs(bagItems) do
        local qOk = filterQuality == 0 or item.quality == filterQuality
        local tOk = filterType == 0 or item.type == filterType
        local visible = qOk and tOk
        if visible then
            shown = shown + 1
            bagCells[i]:SetVisible(true)
            GUI:setText(bagCells[i], item.name)
        else
            bagCells[i]:SetVisible(false)
        end
    end
    if shown == 0 then
        SL:ShowSystemTips("没有匹配的物品")
    end
end

-- 背包筛选：分类统计
local player = class(actor)
local function bagStats(bagItems)
    local stats = {}
    for _, item in ipairs(bagItems) do
        stats[item.type] = (stats[item.type] or 0) + 1
    end
    local lines = {}
    for t, cnt in pairs(stats) do
        lines[#lines + 1] = t .. ": " .. cnt
    end
    sendmsg(player, 1, 0, "背包统计：" .. table.concat(lines, " | "))
end