How do I react to a hover event in GTK?

Platform Core
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1

I want to run some code on a custom widget when the mouse is hovered over it.

I assumed this would be handled by a subclass of GtkGesture, but seemingly no such thing exists.
I know you can use the :hover pseudo class in css, but I want to run actual code when the widget is hovered over.

2

Event controllers are internal to GTK, so they cannot be derived from outside the toolkit.

If you want to track your pointer moving across a widget, as well as entering and leaving it, you can use the GtkEventControllerMotion event controller; it has three signals:

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