---------------------------------------------------------------------------
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2009 Julien Danjou
-- @release @AWESOME_VERSION@
---------------------------------------------------------------------------

local setmetatable = setmetatable
local ipairs = ipairs
local button = require("awful.button")
local layout = require("awful.layout")
local beautiful = require("beautiful")
local capi = { image = image,
               screen = screen,
               widget = widget }

--- Layoutbox widget.
module("awful.widget.layoutbox")

local function update(w, screen)
    local layout = layout.getname(layout.get(screen))
    if layout and beautiful["layout_" ..layout] then
        w.image = capi.image(beautiful["layout_" ..layout])
    else
        w.image = nil
    end
end

--- Create a layoutbox widget. It draws a picture with the current layout
-- symbol of the current tag.
-- @param screen The screen number that the layout will be represented for.
-- @param args Standard arguments for an imagebox widget.
-- @return An imagebox widget configured as a layoutbox.
function new(screen, args)
    local screen = screen or 1
    local args = args or {}
    args.type = "imagebox"
    local w = capi.widget(args)
    update(w, screen)

    local function update_on_tag_selection(tag)
        return update(w, tag.screen)
    end

    capi.screen[screen]:add_signal("tag::attach", function(s, tag)
        tag:add_signal("property::selected", update_on_tag_selection)
        tag:add_signal("property::layout", update_on_tag_selection)
    end)
    capi.screen[screen]:add_signal("tag::detach", function(s, tag)
        tag:remove_signal("property::selected", update_on_tag_selection)
        tag:remove_signal("property::layout", update_on_tag_selection)
    end)

    for _, tag in ipairs(capi.screen[screen]:tags()) do
        tag:add_signal("property::selected", update_on_tag_selection)
        tag:add_signal("property::layout", update_on_tag_selection)
    end
    return w
end

setmetatable(_M, { __call = function(_, ...) return new(...) end })

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