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Overview

The JJArroyo theme must be initialized before components can be properly styled. The library provides a simple static method to apply the theme to your JavaFX Scene.
Theme initialization loads the main stylesheet (jjarroyo-theme.css) which includes all component styles, color variables, and utilities.

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Basic Initialization

To initialize the theme, call JJArroyo.init() with your Scene object: 
import com.jjarroyo.JJArroyo;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class MyApp extends Application {
    @Override
    public void start(Stage primaryStage) {
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 800, 600);
        
        // Initialize the JJArroyo theme
        JJArroyo.init(scene);
        
        primaryStage.setScene(scene);
        primaryStage.setTitle("My Application");
        primaryStage.show();
    }

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

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What Gets Loaded

When you call JJArroyo.init(scene), the following stylesheets are automatically loaded:

variables.css

Color palette, typography, and semantic tokens for light mode

dark.css

Dark mode color overrides and component-specific styles

utilities.css

Tailwind-inspired utility classes for spacing, sizing, and layout

Component Styles

Buttons, cards, forms, navigation, data display, overlays, and more

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Modal Container Setup

If you plan to use modals in your application, you should register a modal container: 
import com.jjarroyo.JJArroyo;
import javafx.scene.layout.StackPane;

public class MyApp extends Application {
    @Override
    public void start(Stage primaryStage) {
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 800, 600);
        
        // Initialize theme
        JJArroyo.init(scene);
        
        // Register modal container
        JJArroyo.setModalContainer(root);
        
        // Now you can use JModal anywhere in your app
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}
The modal container should be a StackPane that sits at the root of your scene. Modals will be overlaid on top of this container.

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Error Handling

The init() method validates the Scene parameter: 
JJArroyo.init(null); // Throws IllegalArgumentException
Always ensure your Scene is not null before initializing the theme.

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Complete Example

Here’s a complete example with modal support: 
import com.jjarroyo.JJArroyo;
import com.jjarroyo.components.JButton;
import com.jjarroyo.components.JModal;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class CompleteApp extends Application {
    @Override
    public void start(Stage primaryStage) {
        // Create root container
        StackPane root = new StackPane();
        
        // Create content
        VBox content = new VBox(16);
        content.setAlignment(Pos.CENTER);
        
        JButton button = new JButton("Open Modal");
        button.setOnAction(e -> {
            JModal modal = new JModal("Hello", "This is a modal!");
            modal.show();
        });
        
        content.getChildren().add(button);
        root.getChildren().add(content);
        
        // Create scene
        Scene scene = new Scene(root, 800, 600);
        
        // Initialize theme and modal container
        JJArroyo.init(scene);
        JJArroyo.setModalContainer(root);
        
        primaryStage.setScene(scene);
        primaryStage.setTitle("JJArroyo Theme Demo");
        primaryStage.show();
    }

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

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Next Steps

Styling Components

Learn how to use CSS classes and custom styles

Dark Mode

Enable dark mode in your application

Custom Colors

Customize the color palette

Components

Explore available components

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