How to detect if the source of a scroll or mouse event is a trackpad or a mouse in JavaFX? -

this same question this one javafx instead of java swing:

i want know if scroll event generated trackpad or mouse in javafx.

according documentation on scrollevent there subtle difference in handling scroll events mouse , trackpad.

when scrolling produced touch gesture (such dragging finger on touch screen), surrounded scroll_started , scroll_finished events.

having in mind can track scroll_started , scroll_finished events , modify scroll_event handler in between these 2 boundaries. trackpad can send scroll_events after scroll_finished being sent (scrolling inertia) can check out event.isinertia() method filter these events.

due probable bug in javafx in rare cases scroll_events may occur after scroll_finished event.isinertia() == false (if scroll on trackpad many many times). possible workaround track timestamp of last scroll_finished event , ignore these "ghost" events within short time period after timestamp.

example code:

long lastfinishedscrollingtime; boolean trackpadscrolling;  node.setonscroll(event -> {     long timediff = system.currenttimemillis() - lastfinishedscrollingtime;     boolean ghostevent = timediff < 1000; // saw 500-700ms ghost events     if (trackpadscrolling || event.isinertia() || ghostevent) {         // trackpad scrolling     } else {         // mouse scrolling     } });  node.setonscrollstarted(event -> {     trackpadscrolling = true; });  node.setonscrollfinished(event -> {     trackpadscrolling = false;     lastfinishedscrollingtime = system.currenttimemillis(); });