Some properties are interpolated, some are not in the animation

I wonder why in the example below, the opacity is interpolated from the start value for the value of the specified key frame, but the width is not. He jumps just the value of keyframe right on click of a button. My error or a bug?

import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;


public class JFXAnimationTest extends Application {


    @Override
    public void start(Stage primaryStage) throws Exception {


        StackPane pane = new StackPane();


        pane.setPadding(new Insets(5));


        final Button animateButton = new Button("Animate");
        animateButton.onActionProperty().set((event)->{
            final Timeline timeline = new Timeline();
            final KeyValue translucentVal = new KeyValue(animateButton.opacityProperty(), 0);
            final KeyValue compressedWidthVal = new KeyValue(animateButton.prefWidthProperty(), 20);
            timeline.setAutoReverse(true);
            timeline.setCycleCount(2);
            final double animationDuration = 0.5;
            timeline.getKeyFrames().add(new KeyFrame(Duration.seconds(animationDuration),
                    translucentVal, compressedWidthVal));
            timeline.play();
        });
        pane.getChildren().add(animateButton);


        primaryStage.setScene(new Scene(pane));
        primaryStage.setTitle(getClass().getSimpleName());
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

Hello

It seems because you have not defined a default size at first the prefWidth property is null?

I added this to your code and it works:

animateButton.setPrefSize( 200, 265 );

Of course, there are always an opacity value of a node as a button that is 1.

Kind regards

Olek

Tags: Java

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