ScrollView mosedown / pointerdown events are not sent when scrolling

[Kobald-Klaus]

I want to get callbacks whenever the scrolltop changes.
Why: because I want to increase the framerate during scroll action and throttle framerate when done.

I am trying with RegisterCallback and RegisterCallback to find out when user is doing something.
But those get only called when there is a click on the view. A scrolling with two fingers on macbook or by swiping on ios however does not emit these events.

I will also need the same to work for sliders when being moved.

So, how would I do that?
And what is the difference between mouse and pointer?

[Kobald-Klaus]

anybody? @alexandred_unity

[karl_jones]

There are quite a few different events you will need to monitor. Take a look at OnAttachToPanel to see the ones we use

Unity-Technologies/UnityCsReference/blob/016297e35ce1bf35a2c411f87fe0d6362cad54c3/ModuleOverrides/com.unity.ui/Core/Controls/ScrollView.cs#L913

This will give you scrolling inside the pane, you then also need each scrollbar.

As you will see above we currently use m_ContentAndVerticalScrollContainer however this will soon be changing to mainly use contentContainer instead, due to some bug fixes with touch handling.

[Kobald-Klaus]

thank you. so there is nothing like OnScrolltopChanged ? Maybe there should be!

[karl_jones]

Not at the moment but there are some planned callbacks for when the scroll offset is modified. This should come along with the binding improvements in the future TBC.