JavaFX更新textArea [英] JavaFX update textArea

问题描述

我有一个简单的JavaFX应用程序，它有一个TextArea。我可以使用start（）方法中的以下代码更新textArea的内容：

I have a simple JavaFX application which has a TextArea. I can update the content of the textArea with the code below inside the start() method:

new Thread(new Runnable() {

    public void run() {

        for (int i = 0; i < 2000; i++) { 

            Platform.runLater(new Runnable() {
                public void run() {
                    txtarea.appendText("text\n");
                }
            });
        }
    }
}).start();

代码只需将 text 字符串写入TextArea 2000次。我想从一个在start（）方法之外实现的函数更新this textArea。

The code just write the text string into the TextArea 2000 times. I want to update this textArea from a function which is implemented outside of the start() method.

public void appendText(String p){
    txtarea.appendText(p);
}

可以从使用JavaFX应用程序更新的任意程序调用此函数文本区。如何在appendText函数中执行此操作？

This function can be called from arbitrary programs which use the JavaFX application to update the TextArea. How can I do this inside the appendText function?

推荐答案

您可以将需要写入的类提供给 javafx.scene.control.TextArea 对您的类的引用，其中包含 public void appendText（String p）方法，然后只需调用它。我建议你也传递一个指示调用该方法的类，例如：

You could give the class which needs to write to the javafx.scene.control.TextArea an reference to your class which holds the public void appendText(String p) method and then just call it. I would suggest you also pass an indication from which class the method was called, e.g.:

public class MainClass implements Initializable {
    @FXML
    private TextArea txtLoggingWindow;
    [...more code here...]
    public void appendText(String string, String string2) {
       txtLoggingWindow.appendText("[" + string + "] - " + string2 + "\n");
    }
}

public class SecondClass {
    private MainClass main;
    public SecondClass(MainClass mClass) {
        this.main = mClass;
    }
    public void callMainAndWriteToArea() {
        this.main.appendText(this.getClass().getCanonicalName(), "This Text Goes To TextArea");
    }
}

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