RichTextFX GenericStyledArea实现咨询：求配置示例及替代方案

Hey there! I totally get how frustrating it is to dive into a new component without clear examples—GenericStyledArea can feel a bit intimidating at first, but once you break it down, it's manageable. Let me walk you through a basic setup and share some alternatives if you still hit roadblocks.

1. Add Dependencies #

First, make sure you have the RichTextFX dependency in your build file. For Maven:

<dependency>
    <groupId>org.fxmisc.richtext</groupId>
    <artifactId>richtextfx</artifactId>
    <version>0.10.6</version> <!-- Use the latest stable version available -->
</dependency>

For Gradle:

implementation 'org.fxmisc.richtext:richtextfx:0.10.6'

2. Minimal Working Example #

Here's a complete JavaFX example that creates a syntax-highlighted editable area—this covers core concepts like initializing the component, setting text, and applying character styles:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import org.fxmisc.richtext.GenericStyledArea;
import org.fxmisc.richtext.StyleSpans;
import org.fxmisc.richtext.StyleSpansBuilder;
import java.util.Collection;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GenericStyledAreaDemo extends Application {

    // Regex to identify Java keywords for highlighting
    private static final Pattern KEYWORD_PATTERN = Pattern.compile("(public|private|static|void|class)");

    @Override
    public void start(Stage primaryStage) {
        // Initialize the area:
        // 1. Supplier for default paragraph styles (empty string = no custom para style)
        // 2. Function to measure character length (basic String::length works here)
        // 3. Initial style spans (empty to start)
        GenericStyledArea<String, String> area = new GenericStyledArea<>(
                () -> "",
                String::length,
                Collections.emptyList()
        );

        // Populate with sample code
        String sampleText = "public class GenericStyledAreaDemo {\n" +
                "    private static void main(String[] args) {\n" +
                "        System.out.println(\"Hello, RichTextFX!\");\n" +
                "    }\n" +
                "}";
        area.replaceText(0, 0, sampleText);

        // Apply syntax highlighting by generating style spans
        area.setStyleSpans(0, computeHighlighting(sampleText));

        // Load CSS to style the highlighted keywords
        Scene scene = new Scene(new StackPane(area), 600, 400);
        scene.getStylesheets().add(getClass().getResource("editor-styles.css").toExternalForm());

        primaryStage.setTitle("GenericStyledArea Demo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    // Helper to create style spans for highlighting
    private StyleSpans<Collection<String>> computeHighlighting(String text) {
        StyleSpansBuilder<Collection<String>> spansBuilder = new StyleSpansBuilder<>();
        Matcher matcher = KEYWORD_PATTERN.matcher(text);
        int lastMatchEnd = 0;

        while (matcher.find()) {
            // Add default style for text between the last keyword and current one
            spansBuilder.add(Collections.emptyList(), matcher.start() - lastMatchEnd);
            // Apply "keyword" style to the matched keyword
            spansBuilder.add(Collections.singleton("keyword"), matcher.end() - matcher.start());
            lastMatchEnd = matcher.end();
        }

        // Add style for any remaining text after the last keyword
        spansBuilder.add(Collections.emptyList(), text.length() - lastMatchEnd);
        return spansBuilder.create();
    }

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

Create a editor-styles.css file in the same directory to style the keywords:

.keyword {
    -fx-fill: darkblue;
    -fx-font-weight: bold;
}

3. Core Concepts to Grasp #

• Paragraph Styles: Each line/paragraph can have its own style (e.g., alignment, line spacing). The first parameter in the constructor sets the default.
• Character Styles: StyleSpans let you apply CSS classes to ranges of text. You can update these dynamically as the user types (add a listener to area.textProperty() if you need live highlighting).
• Editability: The area is editable by default—call area.setEditable(false) if you just need a read-only display.

If GenericStyledArea feels too low-level for your needs, here are some alternatives:

• JavaFX TextFlow: A built-in component for simple rich text display. You can stack Text nodes with different styles, but it doesn't support editing.
• TornadoFX RichTextArea: A Kotlin-based wrapper around RichTextFX that simplifies the API—great if you're using TornadoFX for your JavaFX app.
• JFXRichTextEditor: A higher-level editor built on RichTextFX that includes a toolbar for formatting (bold, italic, etc.)—perfect if you need a full WYSIWYG experience without building everything from scratch.
• FXForms: A lightweight library with a simple rich text component, ideal for quick forms or basic display needs.

内容的提问来源于stack exchange，提问作者SapphicKerfuffle