javafx - javafx - 如果我更改 ObservableList 的属性，表不会更新

Question

我有这个项目：

    public class Person {
    private SimpleStringProperty name;

    public SimpleStringProperty nameProperty(){
        if(this.name==null){
            this.name=new SimpleStringProperty();
        }
        return this.name;
    }

    public final void setName(String value){
        nameProperty().set(value);
    }

    public String getName(){
        return nameProperty().get();
    }

    public Person(String value){
        setName(value);
    }

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

和一张桌子：

TableColumn nomePersona = new TableColumn("NOME")
nomePersona.setCellValueFactory(new PropertyValueFactory<Person,String>("name"));
nomePersona.setCellFactory(TextFieldTableCell.forTableColumn());     
table.getColumns().setAll(nomePersona);        
lista = FXCollections.<Person>observableArrayList();
lista.addAll(new Person("uno"),new Person("due"),new Person("tre"));
table.setItems(lista);

我还有一个按钮，而不是添加一个项目：

private void addPerson(ActionEvent event) {
        Person p = new Person(text.getText());
        lista.add(0, p);
    }

另一个修改第一行的文本：

    private void modifyPerson(ActionEvent event) {
        lista.get(0).setName(TEST_TF.getText());
//        lista.remove(0);
//        lista.add(0, new Person(TEST_TF.getText()));
    }

如果我按下 modifyPerson 按钮更新文本，我可以在第一行看到修改，但如果在我添加新项目之前按下 addPerson 按钮，表格不再刷新。我打印了可观察列表，并且该项目已正确更新，但单元格保持旧值。获得修改的唯一方法是删除并添加一个新项目（请参阅 modifyPerson() 上的 2 个注释行

提前致谢。

这里是完整的代码： 文件 Person.java

package table;

import javafx.beans.property.SimpleStringProperty;

public class Person {
    private SimpleStringProperty name;

    public SimpleStringProperty nameProperty(){
        if(this.name==null){
            this.name=new SimpleStringProperty();
        }
        return this.name;
    }

    public final void setName(String value){
        nameProperty().set(value);
    }

    public String getName(){
        return nameProperty().get();
    }

    public Person(String value){
        setName(value);
    }

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

文件FXMLDocumentController.java

package table;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;

public class FXMLDocumentController implements Initializable {

    private ObservableList<Person> lista;

    @FXML
    private Button btn_add;
    @FXML
    private ComboBox<Person> combo;
    @FXML
    private TextField tfld_textAdd;
    @FXML
    private TableView<Person> tbl_table;
    @FXML
    private Button btn_upd;
    @FXML
    private TextField tfld_textUpdate;
    @FXML
    private Button btn_del;

    @FXML
    private void act_addItem(ActionEvent event) {
        Person p = new Person(tfld_textAdd.getText());
        lista.add(0, p);
        System.out.println(lista.toString());
    }

    @FXML
    private void act_updItem(ActionEvent event) {
        lista.get(0).setName(tfld_textUpdate.getText());
//        lista.remove(0);
//        lista.add(0, new Person(tfld_textUpdate.getText()));
        System.out.println(lista.toString());
    }

    @FXML
    private void act_delItem(ActionEvent event) {
                lista.remove(lista.size()-1);
        System.out.println(lista.toString());
    }
    public void initialize(URL url, ResourceBundle rb) {
        TableColumn nomePersona = new TableColumn("NOME");
        nomePersona.setCellValueFactory(new PropertyValueFactory<Person,String>("name"));
        nomePersona.setCellFactory(TextFieldTableCell.forTableColumn());     
        tbl_table.getColumns().setAll(nomePersona);
        lista = FXCollections.<Person>observableArrayList();
        lista.addAll(new Person("uno"),new Person("due"),new Person("tre"));
        tbl_table.setItems(lista);
        combo.setItems(lista);
        lista.addListener(new InvalidationListener() {
            public void invalidated(Observable observable) {
                System.out.println("INVALIDATION");            
                System.out.println(observable.toString());
            }
        });
        lista.addListener(new ListChangeListener<Person>() {
            public void onChanged(ListChangeListener.Change<? extends Person> c) {
                System.out.println("LIST CHANGER");
                while (c.next()) {
                  if (c.wasPermutated()) {
                      for (int i = c.getFrom(); i < c.getTo(); ++i) {
                           System.out.println("Permutato");
                      }
                  } else if (c.wasUpdated()) {
                           System.out.println("Updatato: ");
                  } else {
                      for (Person remitem : c.getRemoved()) {
                          System.out.println("rimosso: " + remitem.getName());
                      }
                      for (Person additem : c.getAddedSubList()) {
                          System.out.println("addizionato: " + additem.getName());
                      }
                  }
              }
            }
        });              
    }
}

这里的文件Table.java

package table;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Table extends Application {
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }

}

并且比 FXML FXMLDocumen.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="409.0" prefWidth="463.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="table.FXMLDocumentController">
    <children>
        <Button fx:id="btn_add" layoutX="175.0" layoutY="10.0" onAction="#act_addItem" prefHeight="26.0" prefWidth="114.0" text="ADD ITEM 0" /><ComboBox fx:id="combo" layoutX="11.0" layoutY="94.0" prefHeight="26.0" prefWidth="200.0" /><TextField fx:id="tfld_textAdd" layoutX="14.0" layoutY="14.0" AnchorPane.leftAnchor="10.0" AnchorPane.topAnchor="10.0" /><TableView fx:id="tbl_table" layoutX="14.0" layoutY="123.0" prefHeight="275.0" prefWidth="200.0" AnchorPane.bottomAnchor="10.0" AnchorPane.leftAnchor="10.0" AnchorPane.topAnchor="124.0" /><Button fx:id="btn_upd" layoutX="232.0" layoutY="124.0" mnemonicParsing="false" onAction="#act_updItem" prefHeight="26.0" prefWidth="221.0" text="REWRITE ITEM 0" AnchorPane.leftAnchor="232.0" /><TextField fx:id="tfld_textUpdate" layoutX="232.0" layoutY="94.0" prefHeight="26.0" prefWidth="221.0" text="aaa" AnchorPane.leftAnchor="232.0" /><Button fx:id="btn_del" layoutX="298.0" layoutY="10.0" mnemonicParsing="false" onAction="#act_delItem" prefHeight="26.0" prefWidth="114.0" text="DEL ITEM 0" />
    </children>
</AnchorPane>

javafx - javafx - 如果我更改 ObservableList 的属性，表不会更新

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