【界面UI】属性加点界面：自由属性点的分配与预览

---属性加点：三项属性的加减
AttrUI.points = { atk = 0, def = 0, vit = 0 }

function AttrUI.bind(win, free)
    AttrUI.free = free
    for i, key in ipairs({ "atk", "def", "vit" }) do
        local add = GUI:Button_Create(win, "add_" .. key,
            200, 40 + (i - 1) * 40)
        GUI:Button_setTitleText(add, "+")
        GUI:addOnClickEvent(add, function()
            AttrUI.addOne(key)
        end)
    end
    AttrUI.refresh()
end

---加一点：剩余点数的守恒
function AttrUI.addOne(key)
    local used = AttrUI.points.atk + AttrUI.points.def
        + AttrUI.points.vit
    if used >= AttrUI.free then
        SL:ShowSystemTips("自由属性点已用完")
        return
    end
    AttrUI.points[key] = AttrUI.points[key] + 1
    AttrUI.refresh()
end

---提交：本批分配一次性发送
function AttrUI.submit()
    local used = AttrUI.points.atk + AttrUI.points.def
        + AttrUI.points.vit
    if used == 0 then return end
    SL:SendNetMsg(MSGID.ADD_POINT,
        AttrUI.points.atk, AttrUI.points.def,
        AttrUI.points.vit)
    SL:ShowSystemTips("属性点分配已提交")
end

---服务器回包的刷新
SL:RegisterLuaNetMsg("ATTR_SYNC", function(data)
    local d = SL:JsonDecode(data)
    if not d then return end
    AttrUI.free = d.free
    AttrUI.points = { atk = 0, def = 0, vit = 0 }
    AttrUI.refresh()
    GUI:Text_setString(AttrUI.atkLabel,
        "攻击 " .. d.atk)
end)