Question

我已经为我的学校项目（调谐器）实现了fft，但是，我无法将计算的频率传递给GUI。我试过绑定，关键帧，我似乎无法掌握它，我对java来说真的很新。

public class FrequencyBean {

double freq;
private SimpleDoubleProperty value = new SimpleDoubleProperty(this, "value");


public void setValue(double value){
        this.value.set(value);
        System.out.println(value+" set");
    }
public DoubleProperty getDoublePropertyValue(){
    System.out.println("gotvals");
    return value;
}
public FrequencyBean(){
    freq = 10.0;
}

这是我的控制器的一部分，我也被推荐使用称为紧束缚的东西，这将是这个类的抽象。这对我的代码有用吗？

这是我的主要控制者：

public class Controller implements Initializable{

FrequencyBean fbean;

@FXML
private Label otherFq;

@FXML
private Text frequency;

@FXML
private Text sharpFq;

@FXML
private Rectangle sharp6;

@FXML
private Text flatFq;

@FXML
private Rectangle center_rectangle;

@FXML
private Rectangle sharp1;

@FXML
private Rectangle sharp2;

@FXML
private Rectangle sharp3;

@FXML
private Rectangle sharp4;

@FXML
private Rectangle sharp5;

@FXML
private Text centerFq;

@FXML
private Rectangle flat6;

@FXML
private Rectangle flat5;

@FXML
private Rectangle flat4;

@FXML
private Rectangle flat3;

@FXML
private Rectangle flat2;

@FXML
private Rectangle flat1;

@Override
public void initialize(URL location, ResourceBundle resources) {

    fbean = new FrequencyBean();
    otherFq = new Label();
    frequency = new Text();
    boolean stop = false;
    InputThread input =  new InputThread();
         Task<Void> in = new Task<Void>() {

            @Override
            protected Void call() throws Exception {

                input.run();

                return null;

                }
            };
        Thread th0 = new Thread(in);
        th0.start();


        frequency.textProperty().bind(fbean.getDoublePropertyValue());
}

Answer 1

正确地将您的FrequencyBean重写为＆＃39; JavaFX-Bean＆＃39;：

public class FrequencyBean {

   private SimpleDoubleProperty frequency = new SimpleDoubleProperty();

   /**
   * @param frequency the frequency to set
   */
   public void setFrequency(double value){
        this.frequency.set(value);
   }

   /**
   * @return the frequency as double 
   */
   public double getFrequency(){
        return this.frequency.get();
   }

   /**
   * @return the frequency property
   */
   public DoubleProperty frequencyProperty(){
      return value;
   }
   public FrequencyBean(){
      frequency = 10.0;
   }
}

正如Jame_D指出的那样：不要初始化用@FXML注释的控件。只需绑定相关控件：

...
@FXML 
TextField tf_Frequency;
...

fbean = new FrequencyBean(20.3);
tfFrequency.textProperty().bind(fbean.frequencyProperty().asString("%.2f"));

请注意，如果您需要单向绑定，这是正确的。还有一个bindBidirectional方法。

将双值绑定到JavaFX gui

1 个答案: