Task.cancel() | LuaRT free and open source Windows programming framework for Lua

Task:cancel( ) method

Stops Task execution, and set its status to "terminated".

Return value

This method returns true, or false if the Task was already terminated.

Example


local ui = require "ui"

local win = ui.Window("Task:cancel() sample", 320, 200)

local pb1 = ui.Progressbar(win)
local pb2 = ui.Progressbar(win)

pb1:center()
pb1.y = pb1.y - 20
pb2:center()
pb2.y = pb2.y + 20

pb1.themed = false
pb1.fgcolor = 0xEFB42C
pb2.themed = false
pb2.fgcolor = 0x000050

local btn = ui.Button(win, "Stop the Task")
btn:center()
btn.y = btn.y + 60

local function who_wins()
    ui.info(pb1.position >= 100 and "Orange progress bar wins !" or "Blue progress bar wins !")
    win:hide()
end

local task = async(function()
    while pb1.position < 100 or pb2.position < 100 do
        pb1:advance(math.random(1, 10))
        pb2:advance(math.random(1, 10))
        sleep(500)
    end
    who_wins()
end)

function btn:onClick()
    task:cancel()
    who_wins()
end

ui.run(win):wait()