【前端接口】邮件撰写：附件拖拽与群发名单的前端实现

-- 邮件撰写：附件拖拽
local panel = GUI:GetParent("MainTop")
local attachSlots = {}
local function onItemDragToSlot(item, slotIdx)
    if slotIdx > 5 then
        SL:ShowSystemTips("附件栏最多 5 格")
        return
    end
    if attachSlots[slotIdx] ~= nil then
        SL:ShowSystemTips("该附件格已占用")
        return
    end
    attachSlots[slotIdx] = item
    item.locked = true
    SL:ShowSystemTips("已添加附件：" .. item.name)
end

-- 群发流程：确认与回执
local player = class(actor)
local function confirmMassMail(receivers, subject, attaches)
    if #receivers == 0 then
        SL:ShowSystemTips("请先勾选收件人")
        return
    end
    local totalValue = 0
    for _, a in ipairs(attaches) do totalValue = totalValue + a.value end
    SL:ShowSystemTips("即将发送 " .. #receivers .. " 人，附件总价值 " .. totalValue)
    SL:SendNetMsg(9993, subject)
end
local function onMassAck(player2, msgId, w1, w2, w3, sMsg)
    SL:ShowSystemTips("群发完成：成功 " .. w1 .. "，失败 " .. w2)
    if w2 > 0 then
        SL:ShowSystemTips("失败名单已复制，可一键重发")
    end
end
SL:RegisterLuaNetMsg(9994, onMassAck, nil)