JavaFX - move window with effect - javafx-8

Question

I have undecorated non-fullscreen window, which I like to move outside screen boundaries when mouse leaves it's area, but do so smoothly. I found some JavaFX functionality to do so - Timeline, but KeyValue for that Timeline doesn't supports stage.xProperty - because this property is readonlyProperty. Is there way to move my window smoothly using JavaFX functions?

Answer 1

You can setup proxy properties that you manipulate via KeyValues in a Timeline. A listener on the proxy can modify the actual stage location.
import javafx.animation.*;
import javafx.application.*;
import javafx.beans.property.*;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.text.TextAlignment;
import javafx.stage.*;
import javafx.util.Duration;
public class StageSwiper extends Application {
private static final int W = 350;
private static final Duration DURATION = Duration.seconds(0.5);
#Override
public void start(Stage stage) throws Exception {
Label instructions = new Label(
"Window will slide off-screen when the mouse exits it.\n" +
"Click the window to close the application."
);
instructions.setTextAlignment(TextAlignment.CENTER);
final StackPane root = new StackPane(instructions);
root.setStyle("-fx-background-color: null;");
DoubleProperty stageX = new SimpleDoubleProperty();
stageX.addListener((observable, oldValue, newValue) -> {
if (newValue != null && newValue.doubleValue() != Double.NaN) {
stage.setX(newValue.doubleValue());
}
});
final Timeline slideLeft = new Timeline(
new KeyFrame(
DURATION,
new KeyValue(
stageX,
-W,
Interpolator.EASE_BOTH
)
),
new KeyFrame(
DURATION.multiply(2)
)
);
slideLeft.setOnFinished(event -> {
slideLeft.jumpTo(Duration.ZERO);
stage.centerOnScreen();
stageX.setValue(stage.getX());
});
root.setOnMouseClicked(event -> Platform.exit());
root.setOnMouseExited(event -> slideLeft.play());
stage.setScene(new Scene(root, W, 100, Color.BURLYWOOD));
stage.initStyle(StageStyle.UNDECORATED);
stage.show();
stage.centerOnScreen();
stageX.set(stage.getX());
}
public static void main(String[] args) {
launch(args);
}
}