Javafx darken background - javafx

Question

I have FXML application with 10 circles in AnchorPane. I want to hover mouse on one circle and make other 9 and background to darken.
The best I could do was some basic FadeTransition, which only made them disappear, not darken, plus I cant figure out how to select all children of node except one that I have mouse on. Selecting all children except one manually seems not really efficient for more objects.
I tried to google it up, but I just cant find anything.
Please, post a link to thread related to similar problem or sample code. Any help would be really appreciated.

Answer 1

You can use the following sample. Please note that there are some assumptions made, such as every node in the scene graph is a Shape object and that every shape has a Color object associated with the fill. The sample code is sufficient to derive other solutions related specifically to your use case.
import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Shape;
import javafx.stage.Stage;
public class SelectionApp extends Application {
private Pane root = new Pane();
private Parent createContent() {
root.setPrefSize(800, 600);
root.getChildren().add(new Rectangle(800, 600, Color.AQUA));
for (int i = 0; i < 10; i++) {
Circle circle = new Circle(25, 25, 25, Color.GREEN);
// just place them randomly
circle.setTranslateX(Math.random() * 700);
circle.setTranslateY(Math.random() * 500);
circle.setOnMouseEntered(e -> select(circle));
circle.setOnMouseExited(e -> deselect(circle));
root.getChildren().add(circle);
}
return root;
}
private void select(Shape node) {
root.getChildren()
.stream()
.filter(n -> n != node)
.map(n -> (Shape) n)
.forEach(n -> n.setFill(darker(n.getFill())));
}
private void deselect(Shape node) {
root.getChildren()
.stream()
.filter(n -> n != node)
.map(n -> (Shape) n)
.forEach(n -> n.setFill(brighter(n.getFill())));
}
private Color darker(Paint c) {
return ((Color) c).darker().darker();
}
private Color brighter(Paint c) {
return ((Color) c).brighter().brighter();
}
#Override
public void start(Stage primaryStage) throws Exception {
Scene scene = new Scene(createContent());
primaryStage.setTitle("Darken");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}