java - Detecting Mouse Wheel Stops -

i building simple program , need boolean false when user's mouse wheel becomes stopped after having been scrolling. code below more information.

public class wheelhandler extends mouseadapter {      public void mousewheelmoved(mousewheelevent e) {         moved = e.getwheelrotation();         scrolling = true;     }      scrolling = false; // how make run when wheel becomes stopped? } 

rolling series of discrete movements, you're going have decide how time between discrete movements means "stopped", , use swing timer check time increment. need decide on arbitrary time slice (below it's int timer_delay = 100 or 100 msec), start timer when user moves mouse wheel, , cancel same timer when use wheel again before slice up.

for example:

import java.awt.dimension; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.mouseadapter; import java.awt.event.mousewheelevent; import javax.swing.*;  @suppresswarnings("serial") public class notifywheelstopped extends jpanel {     private static final int pref_w = 400;     private static final int pref_h = pref_w;     private static final string wheel_stopped = "wheel has stopped";     private static final string wheel_moving = "wheel moving";     public static final int timer_delay = 100;     private jlabel notificationlabel = new jlabel(wheel_stopped, swingconstants.center);     private wheelhandler wheelhandler = new wheelhandler();     private timer wheelmovementtimer;      public notifywheelstopped() {         add(notificationlabel);         addmousewheellistener(wheelhandler);     }      @override     public dimension getpreferredsize() {         if (ispreferredsizeset()) {             return super.getpreferredsize();         }         return new dimension(pref_w, pref_h);     }      private class wheelhandler extends mouseadapter {         @override         public void mousewheelmoved(mousewheelevent e) {             notificationlabel.settext(wheel_moving);             if (wheelmovementtimer != null && wheelmovementtimer.isrunning()) {                 wheelmovementtimer.stop();             }             wheelmovementtimer = new timer(timer_delay, new wheelmovementtimeractionlistener());             wheelmovementtimer.setrepeats(false);             wheelmovementtimer.start();         }     }      private class wheelmovementtimeractionlistener implements actionlistener {         @override         public void actionperformed(actionevent e) {             notificationlabel.settext(wheel_stopped);         }     }      private static void createandshowgui() {         notifywheelstopped mainpanel = new notifywheelstopped();          jframe frame = new jframe("notifywheelstopped");         frame.setdefaultcloseoperation(jframe.dispose_on_close);         frame.getcontentpane().add(mainpanel);         frame.pack();         frame.setlocationbyplatform(true);         frame.setvisible(true);     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {             public void run() {                 createandshowgui();             }         });     } } 

even delay of 100 msec, notification can jumpy when wheel turned slowly.