awesome/lib/awful/widget/common.lua.in

---------------------------------------------------------------------------
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2008-2009 Julien Danjou
-- @release @AWESOME_VERSION@
---------------------------------------------------------------------------

-- Grab environment we need
local math = math
local type = type
local ipairs = ipairs
local setmetatable = setmetatable
local capi = { widget = widget }
local abutton = require("awful.button")

--- Common widget code
module("awful.widget.common")

-- Private structures
tagwidgets = setmetatable({}, { __mode = 'k' })

function list_update(w, buttons, label, data, widgets, objects)
    -- Hack: if it has been registered as a widget in a wibox,
    -- it's w.len since __len meta does not work on table until Lua 5.2.
    -- Otherwise it's standard #w.
    local len = (w.len or #w) / 2
    -- Add more widgets
    if len < #objects then
        for i = len * 2 + 1, #objects * 2, 2 do
            local ib = capi.widget({ type = "imagebox", align = widgets.imagebox.align })
            local tb = capi.widget({ type = "textbox", align = widgets.textbox.align })

            w[i] = ib
            w[i + 1] = tb
            w[i + 1]:margin({ left = widgets.textbox.margin.left, right = widgets.textbox.margin.right })
            w[i + 1].bg_resize = widgets.textbox.bg_resize or false
            w[i + 1].bg_align = widgets.textbox.bg_align or ""

            if type(objects[math.floor(i / 2) + 1]) == "tag" then
                tagwidgets[ib] = objects[math.floor(i / 2) + 1]
                tagwidgets[tb] = objects[math.floor(i / 2) + 1]
            end
        end
    -- Remove widgets
    elseif len > #objects then
        for i = #objects * 2 + 1, len * 2, 2 do
            w[i] = nil
            w[i + 1] = nil
        end
    end

    -- update widgets text
    for k = 1, #objects * 2, 2 do
        local o = objects[(k + 1) / 2]
        if buttons then
            if not data[o] then
                data[o] = { }
                -- Replace press function by a new one calling with object as
                -- argument
                for kb, b in ipairs(buttons) do
                    -- Copy object
                    local bpress, brelease = b.press, b.release
                    local press, release
                    if bpress then press = function() bpress(o) end end
                    if brelease then release = function () brelease(o) end end
                    data[o][kb] = abutton(b.modifiers, b.button, press, release)
                end
            end
            w[k]:buttons(data[o])
            w[k + 1]:buttons(data[o])
        end

        local text, bg, bg_image, icon = label(o)
        w[k + 1].text, w[k + 1].bg, w[k + 1].bg_image = text, bg, bg_image
        w[k].bg, w[k].image = bg, icon
        if not w[k + 1].text then
            w[k+1].visible = false
        else
            w[k+1].visible = true
        end
        if not w[k].image then
            w[k].visible = false
        else
            w[k].visible = true
        end
   end
end

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