The distance (in CSS pixels) that was scrolled. Can be negative or positive.
The scrollTop of the renderer Element.
true if the latest scroll action was triggered by user input. false if the scroll was triggered internally by the renderer.
In some cases where many scroll events happen in a short amount of time, multiple scroll actions will be merged into a single scroll result. Example: If the renderer started scrolling because of a navigation, but then the user manually scrolled immediately after, the boolean will be true.
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Used by Scroll Renderers to notify the ReaderView of scroll events.