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Graphical User Interface using IUP

Solis includes the IUP toolkit for building graphical user interfaces through the iuplua namespace.
The documentation and example of using iuplua can be found at the IUP website here and a quickstart guide here.
Note that the other IUP lua extension modules, such as iupluacontrols, cd or iuplua_plot51, are not included in Solis. Ony the main IUP lua module iuplua is included.

Below an example of using iuplua:

-- https://www.tecgraf.puc-rio.br/iup/en/basic/index.html

require "iuplua"

counter = 0
text = iup.text{readonly = "YES", value = "", expand = "YES", alignment = "ACENTER"}
button = iup.button{title = "Stop", expand = "YES"}

function idle_cb()
    counter = counter + 1
    text.value = string.format('Iteration %d', counter)
    if counter == 10000 then
        iup.SetIdle(nil)
        button.title = "Start"
    end
    return iup.DEFAULT
end

function button:action()
    text.value = ""
    counter = 0
    iup.SetIdle(nil)
    if button.title == "Stop" then
        button.title = "Start"
    else
        iup.SetIdle(idle_cb)
        button.title = "Stop"
    end
end

dlg = iup.dialog
{
    iup.vbox
    {
        iup.hbox
        {
            button;
            margin = "20x20",
            alignment = "ACENTER"
        };
        iup.hbox
        {
            text;
            margin = "20x20",
            alignment = "ACENTER"
        };
    },
    title = "IUP",
    size = "160x80",
    icon = 0,
}

dlg:showxy(iup.CENTER, iup.CENTER)
iup.SetIdle(idle_cb)
if (iup.MainLoopLevel() == 0) then
    iup.MainLoop()
end

iup.Close()