Problem in changing scene color

Question

I want to change the theme of the application window. I have used RadialGradient in scene creation. Now i want to change the theme by changing scene color.

Answer 1

Hi,
If you want to change the color of your radial gradient dynamically, you can depend on the -fx-base color.,
Suppose, you have the style class to apply for gradient as
.sceneGradient{
     -fx-base: red;
     -fx-background-color:radial-gradient(center 10% 10%, radius 100%, derive(-fx-base,90%) 10%, derive(-fx-base,-10%) 90%);
}In the above class, the base color is red. I can change the theme by changing the base color dynamically.
So please check the below SSCCE (Short, Self Contained, Correct Example) code
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class RadialGradientForScene  extends Application {
     Stage stage;
     Scene scene;
     StackPane root;
     public static void main(String[] args) {
         Application.launch(args);
     @Override
     public void start(Stage stage) throws Exception {
        this.stage = stage;
        this.stage.setWidth(600);
        this.stage.setHeight(600);
         root = new StackPane();
         root.getStyleClass().add("sceneGradient");
         this.scene = new Scene(root, Color.LINEN);
         scene.getStylesheets().add("styles/template.css");
         stage.setTitle("Radial Gradient Scene");
         stage.setScene(this.scene);
         stage.show();
         VBox vb = new VBox();
         vb.setSpacing(15);
         vb.setPadding(new Insets(15));
         vb.getChildren().addAll(getButton("Red", Color.RED),
                                 getButton("Blue", Color.BLUE),
                                 getButton("Green", Color.GREEN),
                                 getButton("Yellow", Color.YELLOW),
                                       getButton("Black", Color.BLACK) );
         root.getChildren().add(vb);
     private Button getButton(String title, final Color color){
          Button btn = new Button(title);
          btn.setOnAction(new EventHandler<ActionEvent>() {
               @Override
               public void handle(ActionEvent paramT) {
                                //On click of button, i am changing the base color accordingly
                    root.setStyle("-fx-base:"+rgbToHex(color)+";");
          return btn;
     public String rgbToHex(Color color) {
          int i = (int)Math.round((double)color.getRed() * 255D);
        int j = (int)Math.round((double)color.getGreen() * 255D);
        int k = (int)Math.round((double)color.getBlue() * 255D);
         return "#"+toHex(i)+toHex(j)+toHex(k) ;
     private String toHex(int code){
          String str ="0123456789ABCDEF";
          return str.charAt(code/16)+""+str.charAt(code%16);
}I hope this can help you to answer you question.
Happy Coding :)
Regards,
Sai Pradeep Dandem.