java - 如何将JavaFX Label绑定(bind)到ListView的所选项目

我有一个充满POJO的ListView，并希望GUI中的标签显示来自所选项目的信息。

我的POJO看起来像这样:

class Customer {
  private String name;
  ...
  public String getName() {
  return name;
  }

现在，当用户从列表中选择客户时，我希望所选客户的名称显示在标签中。

显然我不能直接绑定到name，因为它不是Property。 (而且我不想用String -objects替换我的客户StringProperty，因为SimpleStringProperty不是serializable，并且我需要Customer通过RMI传输。)

我已经尝试过JFXtras中的BeanPathAdapter(顺便说一下，它看起来确实不错)，如下所示:

    BeanPathAdapter<MultipleSelectionModel> customerBeanPathAdapter;
    customerBeanPathAdapter = new BeanPathAdapter<>(lstCustomers.getSelectionModel());
    customerBeanPathAdapter.bindBidirectional("selectedItem.name", lblCustomerName.textProperty());

但是此解决方案仅抛出一个异常:

...
Caused by: java.lang.IllegalArgumentException: Unable to resolve accessor getSelectedItem
at jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle.buildAccessor(BeanPathAdapter.java:3062)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle.buildAccessorWithLikelyPrefixes(BeanPathAdapter.java:3022)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle.updateMethodHandles(BeanPathAdapter.java:2986)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle.<init>(BeanPathAdapter.java:2977)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldBean.performOperation(BeanPathAdapter.java:1348)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldBean.performOperation(BeanPathAdapter.java:1186)
at jfxtras.labs.scene.control.BeanPathAdapter.bindBidirectional(BeanPathAdapter.java:567)
at jfxtras.labs.scene.control.BeanPathAdapter.bindBidirectional(BeanPathAdapter.java:369)
at at.gs1.sync.qm.client.gui.MainWindowController.initialize(MainWindowController.java:61)
... 22 more
Caused by: java.lang.IllegalAccessException: symbolic reference class is not public: class javafx.scene.control.ListView$ListViewBitSetSelectionModel, from jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle
at java.lang.invoke.MemberName.makeAccessException(MemberName.java:512)
at java.lang.invoke.MethodHandles$Lookup.checkSymbolicClass(MethodHandles.java:1113)
at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1094)
at java.lang.invoke.MethodHandles$Lookup.findVirtual(MethodHandles.java:626)
at jfxtras.labs.scene.control.BeanPathAdapter$FieldHandle.buildAccessor(BeanPathAdapter.java:3049)
... 30 more

因此，我希望有一个更好的解决方案，而不是使用lstCustomers.getSelectionModel().selectedItemProperty().addListener(...)并手动处理那里的标签数量。

最佳答案

我认为，相对于我之前提供的解决方案，更好的解决方案是在尝试时使用BeanPathAdapter。
但是，BeanPathAdapter需要添加以下属性:

private final ObjectProperty<B>  beanProp = new SimpleObjectProperty<>();
{
    beanProp.addListener( new ChangeListener<B>()
    {
        @Override
        public void changed( ObservableValue<? extends B> ob, B oldVal, B newVal )
        {
            setBean( newVal );
        }
    } );
}

public ObjectProperty<B> beanProperty()
{
    return beanProp;
}

然后，在您的代码中，您需要以下内容:

BeanPathAdapter<Customer>  custBean;
custBean = new BeanPathAdapter<>( new Customer() );   // empty or any customer
custBean.bindBidirectional( "name", label.textProperty() );
custBean.beanProperty().bind( listview.getSelectionModel().selectedItemProperty() );