Styling JavaFX buttons with pseudo-classes

Last update on December 21 2024 09:59:01 (UTC/GMT +8 hours)

Write a JavaFX program that uses pseudo-classes such as :hover or :focused in CSS to alter the appearance of buttons or text fields when the mouse hovers over them or they are in focus.

Sample Solution:

JavaFx Code:

// Main.java

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Pseudo-Class Example");

        // Create buttons
        Button button1 = new Button("Hover over me!");
        Button button2 = new Button("Click me!");

        // Set IDs for buttons (for CSS styling)
        button1.setId("hover-button");
        button2.setId("focused-button");

        // Add buttons to VBox layout
        VBox vbox = new VBox(button1, button2);

        // Create a scene with the VBox layout
        Scene scene = new Scene(vbox, 300, 200);

        // Load external CSS file
        scene.getStylesheets().add(getClass().getResource("styles.css").toExternalForm());

        // Set the scene on the stage and display it
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

/* styles.css */

/* Styling for the button when hovered */
#hover-button:hover {
    -fx-background-color: #FF6347; /* Change background color on hover */
    -fx-text-fill: white; /* Change text color on hover */
}
/* Styling for the button when focused */
#focused-button:focused {
    -fx-background-color: #1E90FF; /* Change background color when focused */
    -fx-text-fill: white; /* Change text color when focused */
}

Explanation:

In the above exercise, two buttons are created and placed in a vertical box layout. The first button (button1) changes its background color and text color when hovered over due to the :hover pseudo-class in the CSS file. The second button (button2) changes its background color and text color when it gains focus due to the :focused pseudo-class in the CSS file.

Sample Output:

Flowchart:

Java Code Editor:

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