lateUpdate

Type Event
Revision Release 2020.3606
Keywords lateUpdate, runtime
See also Basic Interactivity and Event Detection (guide)

Overview

"lateUpdate" events occur at the frames-per-second interval of the application, either 30 or 60 as specified in config.lua. They are only dispatched to the global Runtime object.

This is dispatched after the "enterFrame" event, and right before the engine starts the rendering process. For this reason, it is useful to make any last update according to its state. Also, it is intended to be a safe call for all those who are listening to this event, otherwise, it loses its purpose.

Properties

Example

local shouldUpdate = false
local rect = display.newRect(100, 100, 30, 30)
local x, y

-- Change the state
local touchListener = function( event )
    x, y = event.x, event.y
    shouldUpdate = true

    print("I need to update my position.") -- This could be call more than once each frame.
    
    return true
end 
rect:addEventListener("touch", touchListener)


-- Interpretation of the new state
local myListener = function( event )
    if not shouldUpdate then return false end
    shouldUpdate = false

    rect.x, rect.y = x, y

    print("Position updated!") -- This is going to be called just once, before the game renders.
end
Runtime:addEventListener( "lateUpdate", myListener )