Slider.SetValueWithoutNotify not working - bug or incorrect use?

Unity Engine
,
1

I’m not too familiar with the new UIElements system, so I’m unsure if this is a bug or intended behaviour, but simply using slider.SetValueWithoutNotify(1f) does not change the slider, whereas slider.value = 1f works.

I want to link two controls together (Slider and FloatField) to recreate the regular float field from the IMGUI system. Whenever one of the values changes I want to perform some action and then also update the other control but without triggering the action a second time.

For the slider I subscribe to the change event like this:

slider.RegisterValueChangedCallback(evt =>
{
    float value = (float)Math.Round(Mathf.Max(0, evt.newValue), 2);
    Time.timeScale = value;
    timeField.SetValueWithoutNotify(value);
});

This works correctly. The timeField (FloatField) is updated without broadcasting its own value changed event.

However, the other way around it doesn’t work:

timeField.RegisterValueChangedCallback(evt =>
{
    float value = (float)Math.Round(Mathf.Max(0, evt.newValue), 2);
    Time.timeScale = value;
    // Doesn't change the slider.
    slider.SetValueWithoutNotify(value);
    //slider.value = value; // Only this works
});

I also tested that setting slider.value = someValue in fact triggers a new ValueChanged event.

Are sliders special or is this a bug?

2

It’s definitely a bug. Thanks for reporting this!

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