JavaFX的绑定属性不成员控制 [英] JavaFX bind not property member to control

问题描述

想象我像一个POJO：

Imagine I have a POJO like:

public class Person()
{
  private int id;
  private String name;

  public int getId()
  {
     return this.id;
  }

  public String getName()
  {
     return this.name;
  }
}

如果我需要用bind（）方法来名成员绑定到JavaFX的标签，我不能适用，因为我需要和观察的价值。

If I need to bind name member to JavaFX label using bind() method, I can't apply because I need and observable value.

我知道，我可以使用，而不是StringProperty字符串，但我需要的原始类型，因为我使用Hibernate，我不知道是否可以休眠，通过JavaFX支持的属性从DB地图数据。

I know that I can use StringProperty instead String, but I need primitive types because I use Hibernate and I don't know if Hibernate could support properties from JavaFX to map data from DB.

我有哪些替代从我的POJO绑定到一个JavaFX控制？

Which alternatives I have to bind from my pojo to a JavaFX control?

推荐答案

您有几个选择。

首先，它可以使用FX属性在JPA / Hibernate的实体，但你必须要小心一点。总之，你需要确保你使用的，而不是试图直接设置字段，这样的ORM调用get / set方法属性访问。史蒂芬面包车IMPE 讨论这个问题在他的博客，我也博客上同一主题的。有一件事我还没有尝试过在这里是映射集合，并使用 ObservableList 取值：作为JPA实现使用列表的子接口，可能会非常棘手。

Firstly, it's possible to use FX Properties in JPA/Hibernate entities, though you have to be a little careful. In short, you need to make sure you use property access so that the ORM calls the get/set methods, instead of trying to set the field directly. Steven van Impe discusses this on his blog, and I also blogged on the same topic. One thing I haven't tried here is mapping collections and using ObservableLists: that might be tricky as JPA implementations use a subinterface of List.

您另一种选择是让在Java Bean的意义上的性能绑定属性，然后使用的 Java Bean的属性适配器：

Your other option is to make the properties "bound properties" in the Java Bean sense, and then to use a Java Bean Property Adapter:

import java.beans.PropertyChangeSupport ;

public class Person()
{
    private int id;
    private String name;

    private final PropertyChangeSupport pcs = new PropertyChangeSupport(this);

    public void addPropertyChangeListener(PropertyChangeListener listener) {
        this.pcs.addPropertyChangeListener(listener);
    }

    public void removePropertyChangeListener(PropertyChangeListener listener) {
        this.pcs.removePropertyChangeListener(listener);
    }

    public int getId()
    {
       return this.id;
    }

    public void setId(int id) 
    {
       int oldId = this.id ;
       this.id = id ;
       pcs.firePropertyChange("id", oldId, id);
    }

    public String getName()
    {
       return this.name;
    }

    public void setName(String name) 
    {
        String oldName = this.name ;
        this.name = name ;
        pcs.firePropertyChange("name", oldName, name);
    }
}

然后，你可以做

Label nameLabel = new Label();
Person person = new Person();
nameLabel.textProperty().bind(JavaBeanStringPropertyBuilder.create()
    .bean(person)
    .name("name") // name of property to bind to
    .build());

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