user interface - JavaFX - Set Slider value after dragging mouse button -

i'm writing music player , don't know how code slider dragging handler set value after user frees mouse button. when write simple mousedragged method dragging brings non estetic "rewinding" sound because mediaplayer changes value every time slider moves. while playing slider automatic changes value mediaplayer listener synchronize track duration. got far.

changelistener<duration> timelistener =  new changelistener<duration>() {     @override     public void changed(             observablevalue<? extends duration> observablevalue,             duration duration,             duration current) {         durslider                 .setvalue(current                         .toseconds());     } };  durslider.setonmousedragged(new eventhandler<mouseevent>() {             @override             public void handle(mouseevent mouseevent) {                      mediaplayer.seek(duration.seconds(durslider.getvalue()));                      }                  }); 

the valuechanging property of slider indicates if slider in process of being changed. observable property, can attach listener directly it, , respond when value stops changing:

durslider.valuechangingproperty().addlistener(new changelistener<boolean>() {     @override     public void changed(observablevalue<? extends boolean> obs, boolean waschanging, boolean isnowchanging) {         if (! isnowchanging) {             mediaplayer.seek(duration.seconds(durslider.getvalue()));         }     } }); 

this won't change position of player if user clicks on "track" on slider, or uses keyboard move it. that, can register listener value property. need careful here, because value going change via time listener. in theory, time listener should set value of slider, , should cause attempt set current time of player exact value has (which result in no-op). however, rounding errors result in lot of small adjustments, causing "static" observing. fix this, move media player if change more small minimum amount:

private static double min_change = 0.5 ; //seconds  // ...  durslider.valueproperty().addlistener(new changelistener<number>() {     @override     public void changed(observablevalue<? extends number> obs, number oldvalue, number newvalue) {         if (! durslider.isvaluechanging()) {             double currenttime = mediaplayer.getcurrenttime().toseconds();             double slidertime = newvalue.doublevalue();             if (math.abs(currenttime - slidertime) > 0.5) {                 mediaplayer.seek(newvalue.doublevalue());             }         }     } }); 

finally, don't want time listener move slider if user trying drag it:

changelistener<duration> timelistener =  new changelistener<duration>() {     @override     public void changed(             observablevalue<? extends duration> observablevalue,             duration duration,             duration current) {         if (! durslider.isvaluechanging()) {             durslider.setvalue(current.toseconds());         }     } }; 

here's complete example (using lambdas brevity):

import javafx.application.application; import javafx.geometry.pos; import javafx.scene.scene; import javafx.scene.control.slider; import javafx.scene.layout.borderpane; import javafx.scene.layout.hbox; import javafx.scene.media.media; import javafx.scene.media.mediaplayer; import javafx.scene.media.mediaview; import javafx.stage.stage; import javafx.util.duration;  public class videoplayertest extends application {      private static final string media_url =             "http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv";      private static final double min_change = 0.5 ;      @override     public void start(stage primarystage) {         mediaplayer player = new mediaplayer(new media(media_url));         mediaview mediaview = new mediaview(player);          slider slider = new slider();         player.totaldurationproperty().addlistener((obs, oldduration, newduration) -> slider.setmax(newduration.toseconds()));          borderpane root = new borderpane(mediaview, null, null, slider, null);          slider.valuechangingproperty().addlistener((obs, waschanging, ischanging) -> {             if (! ischanging) {                 player.seek(duration.seconds(slider.getvalue()));             }         });          slider.valueproperty().addlistener((obs, oldvalue, newvalue) -> {             if (! slider.isvaluechanging()) {                 double currenttime = player.getcurrenttime().toseconds();                 if (math.abs(currenttime - newvalue.doublevalue()) > min_change) {                     player.seek(duration.seconds(newvalue.doublevalue()));                 }             }         });          player.currenttimeproperty().addlistener((obs, oldtime, newtime) -> {             if (! slider.isvaluechanging()) {                 slider.setvalue(newtime.toseconds());             }         });          scene scene = new scene(root, 540, 280);         primarystage.setscene(scene);         primarystage.show();          player.play();     }      public static void main(string[] args) {         launch(args);     } }