【界面UI】小地图事件标记聚合：同区标记的合并与展开

local marks = {}
local function addMark(x, y, icon)
    for _, m in ipairs(marks) do
        local mx, my = GUI:getPosition(m.btn)
        if math.abs(mx - x) < 16 and math.abs(my - y) < 16 then
            m.count = m.count + 1
            GUI:setText(m.label, tostring(m.count))
            return
        end
    end
    local btn = GUI:Button_Create(mapLayer, "mk" .. os.clock(), x, y, icon)
    local label = GUI:Text_Create(btn, "cnt", 18, -4, "1", 12, { 255, 90, 90 })
    table.insert(marks, { btn = btn, label = label, count = 1 })
end

local expanded = nil
GUI:addOnClickEvent(mapLayer, function()
    if expanded ~= nil then
        GUI:setVisible(expanded, false)
        expanded = nil
    end
end)