Question

我写了一个程序来练习Java FX中的线程，但是我想增加更好的可访问性。我使用JAWS，所以我想要的是当我的文本区域动态更新时，我希望我的屏幕阅读器宣布新文本。我在堆栈溢出时找到了答案，所以我不知道这篇文章是否被认为是重复的。问题在于给出的解决方案仅适用于画外音，我自己没有测试过，所以我不确定。但是，JAWS和NVDA根本无法使用给定的代码。

这是我在堆栈溢出时发现的帖子：

Accessible screenreading of JavaFX "console" output

本文中的答案使用

TextArea.executeAccessibleAction(AccessibleAction.SET_TEXT_SELECTION,

开始，结束）；

方法。如前所述，这是行不通的。有谁知道如何让Windows屏幕阅读器说出Java FX TextArea中的更新文本？

这是我的代码，没有任何可访问性支持尝试：

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.AccessibleAction;
import javafx.scene.AccessibleRole;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.ScrollPane.ScrollBarPolicy;
import javafx.scene.control.TextArea;
import javafx.event.EventHandler;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.KeyCode;
import javafx.application.Platform;


public class KeyPresser extends Application implements EventHandler<KeyEvent> {

    private class MyRunnable implements Runnable {

        public void run() {
            try {
                while (true) {
                    Platform.runLater(new AppendTextRunnable("Message from " + Thread.currentThread().getName() + "\n"));
                    Thread.sleep(1000);
                }//end while loop
            } catch(InterruptedException ie) {
                Platform.runLater(new AppendTextRunnable(Thread.currentThread().getName() + " gets interrupted! Terminate!\n"));
            }//end try catch
        }//end method

    }//end nested class

    private class AppendTextRunnable implements Runnable {
        private String text;

        private AppendTextRunnable(String text) {
            this.text = text;
        }//end constructor 

        @Override
        public void run() {
            KeyPresser.this.outputArea.appendText(this.text);
        }//end method

    }//end nested class


    private int counter = 0;
    private Thread t1, t2;
    private TextArea outputArea;

    public static void main(String[] args) {
        Application.launch(args);
    }  //end method

    @Override
    public void start(Stage primaryStage) {
        ScrollPane scrollPane = new ScrollPane();
        Scene scene = new Scene(scrollPane, 500, 500);

        this.outputArea = new TextArea();
        this.outputArea.setEditable(false);

        scrollPane.setContent(this.outputArea);
        scrollPane.setVbarPolicy(ScrollBarPolicy.ALWAYS);

        scene.setOnKeyReleased(this);
        primaryStage.setScene(scene);
        primaryStage.setTitle        ("the Key Presser");
        primaryStage.show();

        this.t1 = new Thread(new MyRunnable());
        this.t2 = new Thread(new MyRunnable());

        this.t1.setDaemon(true);
        this.t2.setDaemon(true);
        this.t1.start();
        this.t2.start();
    }  //end method

    @Override
    public void handle(KeyEvent key) {
        KeyCode keyCode = key.getCode();

        if (key.getEventType() == KeyEvent.KEY_RELEASED && !keyCode.isNavigationKey()) {
            this.counter++;

            if (this.counter == 1) {
                this.t1.interrupt();
            } else if (this.counter == 2) {
                this.t2.interrupt();
            } else if (this.counter == 3) {
                Platform.runLater(new AppendTextRunnable("All threads are terminated\n"));
            }//end else if
        }//end if
    }//end method

}  //end class

如何使JAWS和NVDA在Java FX中读取动态更新的TextArea

0 个答案: