为什么我不能在此小部件上使用 get_children_by_id()

Question

我想访问内部小部件，但它给我一个错误，我无法为 nil 值编制索引。

我的插件：

local previewWidget = wibox()

previewWidget:setup {
    widget = wibox.widget {
        {
            widget = wibox.widget {
                {
                    widget = awful.widget.clienticon,
                    client = "", 
                    id = "clientIcon"
                },
                {
                    widget = wibox.widget.textbox,
                    id = "titleText"
                },
                nil
            },
            layout = wibox.layout.align.horizontal,
            id = "titleBox"
        },
        {
            widget = wibox.widget.imagebox,
            id = "clientImage"
        },
        nil
    },  
    id = "previewBox",
    layout = wibox.layout.align.vertical,
    border_width = 10, 
    border_color = "FF0000",
}

这条命令没有报错：

local previewBox = previewWidget:get_children_by_id("previewBox")[1]

但是这样做：

local titleBox = previewWidget:get_children_by_id("titleBox")[1]
local clientIcon = previewWidget:get_children_by_id("clientIcon")[1]

我做错了什么？

Answer 1

local previewWidget = wibox.widget {
    {
        {
            widget = awful.widget.clienticon,
            client = "",
            id = "clientIcon"
        },
        {
            widget = wibox.widget.textbox,
            id = "titleText"
        },
        nil,

        layout = wibox.layout.align.horizontal,
        id = "titleBox"
    },
    {
        widget = wibox.widget.imagebox,
        id = "clientImage"
    },
    nil,

    layout = wibox.layout.align.vertical,
    id = "previewBox",
}

我错误地使用了布局：
所有 3 个小部件都需要位于调用布局的位置

local some_widget = wibox.widget {
   { widget nr.1 },
   { widget nr.2 },
   { widget nr.3 },
   layout = wibox.layout.align.vertical
}

P.S。声明一个没有小部件的布局就足够了

为什么我不能在此小部件上使用 get_children_by_id()

Why can't I use get_children_by_id() on this widget

awesome-wm