awesome/lib/awful/widget/button.lua

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

local setmetatable = setmetatable
local type = type
local abutton = require("awful.button")
local imagebox = require("wibox.widget.imagebox")
local widget = require("wibox.widget.base")
local surface = require("gears.surface")
local cairo = require("lgi").cairo
local capi = { mouse = mouse }

local button = { mt = {} }

--- Create a button widget. When clicked, the image is deplaced to make it like
-- a real button.
--
-- @param args Widget arguments. "image" is the image to display.
-- @return A textbox widget configured as a button.
function button.new(args)
    if not args or not args.image then
        return widget.empty_widget()
    end

    local w = imagebox()
    local orig_set_image = w.set_image
    local img_release
    local img_press

    w.set_image = function(w, image)
        img_release = surface.load(image)
        img_press = img_release:create_similar(cairo.Content.COLOR_ALPHA, img_release.width, img_release.height)
        local cr = cairo.Context(img_press)
        cr:set_source_surface(img_release, 2, 2)
        cr:paint()
        orig_set_image(w, img_release)
    end
    w:set_image(args.image)
    w:buttons(abutton({}, 1, function () orig_set_image(w, img_press) end, function () orig_set_image(w, img_release) end))
    return w
end

function button.mt:__call(...)
    return button.new(...)
end

return setmetatable(button, button.mt)

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