CODEWITHSUNDEEP
luaslidercomponentscoronasdk
Oli
Oli

Reputation: 47

Corona Slider add listener property after creation

I am trying to add the listener property to a slider component after creation:

local function sliderListener( _event )
    print(_event.value)
end

slider = widget.newSlider
{
    top = 30,
    left = 10,
    orientation = "vertical",
    height = 200,
    value = 10,  -- Start slider at 10% (optional)
}

slider.listener = sliderListener

However... it doesn't work. Is this impossible or am I using the incorrect syntax?

Thanks in advance.

Upvotes: 0

Views: 407

Answers (2)

Chomu
Chomu

Reputation: 224

You can assign the slider listener in tow ways. slider = widget.newSlider { top = 30, left = 10, orientation = "vertical", height = 200, value = 10, -- Start slider at 10% (optional) slider.listener = sliderListener }

or slider = widget.newSlider { top = 30, left = 10, orientation = "vertical", height = 200, value = 10, -- Start slider at 10% (optional) } slider.addEventListener("touch", sliderListener)

Upvotes: 0

Oliver
Oliver

Reputation: 29571

Not sure if the property must exist at creation time. Try:

slider = widget.newSlider
{
    top = 30,
    ...
    value = 10,  -- Start slider at 10% (optional)
    listener = sliderListener,
}

If you really need to set the handler after creation, instead use the above and set a delegate function to be used by sliderListener. For example: 

local actualListener

function actualListener1(event)
    ...
end

function actualListener2(event)
    ...
end

function sliderListener(event)
    actualListener(event)
end

... create SliderWidget with listener = sliderListener...

actualListener = actualListener2

You could also make the sliderListener a table that has a __call (via setmetatable(s, {__call = Set.call})

Upvotes: 1

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