如何将Eclipse编辑器集成至Java FXML桌面应用？该需求是否可行？

Absolutely feasible! You can absolutely integrate Eclipse's code editing components into your Java FXML desktop app—this is a common use case for developers looking to leverage Eclipse's mature, feature-rich editing tools in custom desktop applications. Below’s a breakdown of how to make this happen, with practical steps and code examples:

Short answer: Yes. Eclipse’s core editing functionality is built as modular, reusable components (part of the Eclipse Platform’s SWT/JFace and Text Framework) that can be extracted and embedded into any Java application—including JavaFX/FXML apps. You don’t need to ship the entire Eclipse IDE; just the specific bundles your editor requires.

There are two primary paths to implement this:

• Embed Eclipse’s native SWT-based editor components: This is the most direct approach, using Eclipse’s SourceViewer (the same component powering Eclipse’s code editor) and embedding it into your JavaFX app via FXCanvas.
• Use Eclipse’s Language Server Protocol (LSP): For a more flexible, modern approach, you could connect a JavaFX text component to Eclipse’s language servers (like JDT LS for Java) using LSP4J. This lets you add syntax highlighting, code completion, and other IDE features to a custom JavaFX editor.

This is the most straightforward way to get a full-featured Eclipse editor in your FXML app:

1. Set Up Dependencies #

You’ll need to include Eclipse’s core platform dependencies. If using Maven/Gradle, add bundles like:

• org.eclipse.swt (platform-specific, e.g., org.eclipse.swt.win32.win32.x86_64 for 64-bit Windows)
• org.eclipse.jface.text (for the SourceViewer and text framework)
• org.eclipse.core.runtime (for core platform utilities)
• For Java-specific editing: org.eclipse.jdt.core and org.eclipse.jdt.ui

2. Add FXCanvas to Your FXML #

Since Eclipse’s editor uses SWT, you’ll need FXCanvas (from javafx.embed.swt) to bridge JavaFX and SWT in your FXML layout:

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.embed.swt.FXCanvas?>

<BorderPane xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.yourpackage.EditorController">
    <center>
        <FXCanvas fx:id="editorCanvas" />
    </center>
</BorderPane>

3. Initialize the Eclipse Editor in Your Controller #

In your FXML controller, set up the SWT environment, create the SourceViewer, and attach it to the FXCanvas:

import javafx.embed.swt.FXCanvas;
import javafx.fxml.FXML;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class EditorController {
    @FXML
    private FXCanvas editorCanvas;

    public void initialize() {
        // Get the SWT Display (create one if it doesn't exist)
        Display display = Display.getCurrent() != null ? Display.getCurrent() : new Display();
        Shell shell = new Shell(display);
        
        // Create a SWT composite to host the editor
        Composite editorComposite = new Composite(shell, SWT.NONE);
        editorComposite.setBounds(0, 0, 800, 600);

        // Initialize Eclipse's SourceViewer
        SourceViewer sourceViewer = new SourceViewer(editorComposite, null, SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL);
        sourceViewer.setEditable(true);

        // Set up a sample Java document
        IDocument document = new Document();
        document.set("public class SampleClass {\n    public static void main(String[] args) {\n        System.out.println(\"Hello from Eclipse Editor!\");\n    }\n}");
        sourceViewer.setDocument(document);

        // Optional: Add syntax highlighting, code completion, etc.
        // For Java, you'd configure a JavaPartitionScanner, ITokenScanner, and content assistant here

        // Attach the SWT composite to the FXCanvas
        editorCanvas.setContent(editorComposite);
    }
}

• Platform Compatibility: SWT is platform-specific, so you’ll need to include the correct SWT jar for each target OS (Windows, macOS, Linux). Tools like Maven’s os-maven-plugin can help manage this.
• Thread Safety: SWT requires all UI operations to run on its own thread, while JavaFX uses its own Application Thread. Use Display.asyncExec() for SWT operations and Platform.runLater() for JavaFX operations to avoid crashes.
• Dependency Bloat: Eclipse’s components have several transitive dependencies. Use tools like Maven Shade or Gradle Shadow to package only the necessary bundles with your app.
• Feature Customization: To add full IDE features (like code completion, refactoring), you’ll need to configure additional components like content assistants, partition scanners, and possibly connect to Eclipse’s JDT core for Java-specific logic.

With the right setup, you’ll have a fully functional Eclipse-style code editor embedded directly in your FXML app. The SWT embedding approach gives you immediate access to Eclipse’s mature editing features, while the LSP approach offers more flexibility if you want to use a native JavaFX text component.

内容的提问来源于stack exchange，提问作者user1406304