Question

我试图了解如何为非永久对象正确实现LeafValueEditor。这两种方式中的哪一种是正确的，还是应该使用其他方式？

public class Address {
   public String line1;
   public String city;
   public String zip;
}

选项1：

public class AddressEditor implements LeafValueEditor<Address>
{

    private String line1;
    private String city;
    private String zip;

    private Address address;
    public void setValue(Address value)
    {
       this.line1 = value.line1;
       this.city = value.city;
       this.zip = value.zip;
       this.address = value;
    }

    public Address getValue()
    {
        this.address.line1 = this.line1;
        this.address.city = this.city;
        this.address.zip = this.zip;
        return this.address;
    }

}

选项2：

public class AddressEditor implements LeafValueEditor<Address>
{

    private String line1;
    private String city;
    private String zip;

    public void setValue(Address value)
    {
       this.line1 = value.line1;
       this.city = value.city;
       this.zip = value.zip;
    }

    public Address getValue()
    {
        Address a = new Address();

        this.a.line1 = this.line1;
        this.a.city = this.city;
        this.a.zip = this.zip;

        return a;
    }

}

Answer 1

可能两者都没有，尽管两者在技术上都可行。

LeafValueEditor是叶值的编辑器 - 即通常不包含其他值的值。通常，页面上可见的文本或日期或数字字段是叶子编辑器，这些叶子节点包含在普通的编辑器中。

在这种情况下，它看起来像这样：

public class AddressEditor extends Composite implements Editor<Address> {
  // not private, fields must be visible for the driver to manipulate them 
  // automatically, could be package-protected, protected, or public
  protected TextBox line1;//automatically maps to getLine1()/setLine1(String)
  protected TextBox city;
  protected TextBox zip;

  public AddressEditor() {
    //TODO build the fields, attach them to some parent, and 
    //     initWidget with them
  }
}

请参阅http://www.gwtproject.org/doc/latest/DevGuideUiEditors.html#Editor_contract，了解更多详细信息，了解如何通过这么少的布线自动将它们组合在一起。

如何实现LeafValueEditor <address> </address>

1 个答案: