Redirecting System.out to a TextArea in JavaFX

Question

Update:

Still having the same issue, revised source of main app code: http://pastebin.com/fLCwuMVq

There must be something in CoreTest that bl

Answer 1

Have you tried running it on the UI Thread?

public void write(final int i) throws IOException {
    Platform.runLater(new Runnable() {
        public void run() {
            output.appendText(String.valueOf((char) i));
        }
    });
}

EDIT

I think your problem is that your run some long tasks in the GUI thread, which is going to freeze everything until it completes. I don't know what

CoreTest t = new CoreTest(installPath);
t.perform();

does, but if it takes a few seconds, your GUI won't update during those few seconds. You need to run those tasks in a separate thread.

For the record, this works fine (I have removed the file and CoreTest bits):

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws IOException {

        TextArea ta = TextAreaBuilder.create().prefWidth(800).prefHeight(600).wrapText(true).build();
        Console console = new Console(ta);
        PrintStream ps = new PrintStream(console, true);
        System.setOut(ps);
        System.setErr(ps);
        Scene app = new Scene(ta);

        primaryStage.setScene(app);
        primaryStage.show();

        for (char c : "some text".toCharArray()) {
            console.write(c);
        }
        ps.close();
    }

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

    public static class Console extends OutputStream {

        private TextArea output;

        public Console(TextArea ta) {
            this.output = ta;
        }

        @Override
        public void write(int i) throws IOException {
            output.appendText(String.valueOf((char) i));
        }
    }
}