animation - Slide in/out JavaFX stage from/to right side of the screen -

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i have task make javafx application. when start window should slides smoothly right side of screen , when click on "x" button it's should slides out right side , finishes.

i found possible use simple timeline animation this. made window slide in, when run app, can't figure out how slide out window.

i tried handle defining handler via setoncloserequest() method of stage, stuck 2 problems:

  1. can't implement animation
  2. after click on "x" application closed if use consume() method of window event

code:

public class main extends application {      public static void main(string[] args) {         application.launch(args);     }      @override     public void start(stage stage) {         stage.settitle("main");         group root = new group();         scene scene = new scene(root, 300, 250);         stage.setscene(scene);           rectangle2d primscreenbounds = screen.getprimary().getvisualbounds();         stage.setx(primscreenbounds.getminx() + primscreenbounds.getwidth());         system.out.println(primscreenbounds.getwidth());         stage.sety(primscreenbounds.getminy());         stage.setwidth(0);         stage.setheight(primscreenbounds.getheight());          timeline timeline = new timeline();         timeline.setautoreverse(true);          writablevalue<double> writablewidth = new writablevalue<double>() {             @override             public double getvalue() {                 return stage.getwidth();             }              @override             public void setvalue(double value) {                 stage.setwidth(value);             }         };          keyvalue kv = new keyvalue(writablewidth, 600d);         keyframe kf = new keyframe(duration.millis(3000), kv);         timeline.getkeyframes().addall(kf);         timeline.play();         stage.show();         stage.setoncloserequest(new eventhandler<windowevent>() {             @override             public void handle(windowevent event) {                 event.consume();              }         });      } }

this works (kind of, not smooth) me:

import javafx.animation.keyframe; import javafx.animation.keyvalue; import javafx.animation.timeline; import javafx.application.application; import javafx.application.platform; import javafx.beans.value.writablevalue; import javafx.event.eventhandler; import javafx.geometry.rectangle2d; import javafx.scene.group; import javafx.scene.scene; import javafx.stage.screen; import javafx.stage.stage; import javafx.stage.windowevent; import javafx.util.duration;  public class slidingwindow extends application {      public static void main(string[] args) {         application.launch(args);     }      @override     public void start(stage stage) {          stage.settitle("main");         group root = new group();         scene scene = new scene(root);         stage.setscene(scene);           rectangle2d primscreenbounds = screen.getprimary().getvisualbounds();         double screenrightedge = primscreenbounds.getmaxx() ;         stage.setx(screenrightedge);         system.out.println(primscreenbounds.getwidth());         stage.sety(primscreenbounds.getminy());         stage.setwidth(0);         stage.setheight(primscreenbounds.getheight());          timeline timeline = new timeline();           writablevalue<double> writablewidth = new writablevalue<double>() {             @override             public double getvalue() {                 return stage.getwidth();             }              @override             public void setvalue(double value) {                 stage.setx(screenrightedge - value);                 stage.setwidth(value);             }         };           keyvalue kv = new keyvalue(writablewidth, 600d);         keyframe kf = new keyframe(duration.millis(3000), kv);         timeline.getkeyframes().addall(kf);         timeline.play();         stage.show();         stage.setoncloserequest(new eventhandler<windowevent>() {             @override             public void handle(windowevent event) {                 timeline timeline = new timeline();                 keyframe endframe = new keyframe(duration.millis(3000), new keyvalue(writablewidth, 0.0));                 timeline.getkeyframes().add(endframe);                 timeline.setonfinished(e -> platform.runlater(() -> stage.hide()));                 timeline.play();                 event.consume();             }         });      } }

the platform.runlater(...) seems necessary prevent slew of nullpointerexceptions when window hidden, because animation causing system try access stage no longer exists.


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