---------------------------------------------------------------------------
--- Autofocus functions.
--
-- When loaded, this module makes sure that there's always a client that will
-- have focus on events such as tag switching, client unmanaging, etc.
--
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2009 Julien Danjou
-- @release @AWESOME_VERSION@
-- @module awful.autofocus
---------------------------------------------------------------------------

local client = client
local screen = screen
local aclient = require("awful.client")
local atag = require("awful.tag")
local timer = require("gears.timer")

--- Give focus when clients appear/disappear.
--
-- @param obj An object that should have a .screen property.
local function check_focus(obj)
    -- When no visible client has the focus...
    if not client.focus or not client.focus:isvisible() then
        local c = aclient.focus.history.get(obj.screen, 0, aclient.focus.filter)
        if c then
            c:emit_signal("request::activate", "autofocus.check_focus",
                          {raise=false})
        end
    end
end

--- Check client focus (delayed).
-- @param obj An object that should have a .screen property.
local function check_focus_delayed(obj)
    timer.delayed_call(check_focus, {screen = obj.screen})
end

--- Give focus on tag selection change.
--
-- @param tag A tag object
local function check_focus_tag(t)
    local s = atag.getscreen(t)
    if not s then return end
    check_focus({ screen = s })
    if client.focus and client.focus.screen ~= s then
        local c = aclient.focus.history.get(s, 0, aclient.focus.filter)
        if c then
            c:emit_signal("request::activate", "autofocus.check_focus_tag",
                          {raise=false})
        end
    end
end

tag.connect_signal("property::selected", function (t)
    timer.delayed_call(check_focus_tag, t)
end)
client.connect_signal("unmanage",            check_focus_delayed)
client.connect_signal("tagged",              check_focus_delayed)
client.connect_signal("untagged",            check_focus_delayed)
client.connect_signal("property::hidden",    check_focus_delayed)
client.connect_signal("property::minimized", check_focus_delayed)

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