如何在JavaFX

Question

我在JavaFX中遇到了TableView的问题。我的表视图的第一个状态是：

然后当我在“Nombre deplacesàréserver”列中编辑我的TableView值时，新值保持显示在我的TableView中，但是当我尝试获取Items并在控制台中显示它们时，我收到了TableView的旧值（它在控制台的第2行显示“0”而不是“8”）：

这是窗口的控制器代码：

public class ReserverWindowController {

    private SpectacleDto spectacleToReserve;

    public TableView<SpectacleReservationDto> listeTarifs = new TableView<SpectacleReservationDto>();
    public ObservableList<SpectacleReservationDto> data = FXCollections.observableArrayList();

    public Label labelNomSpectacle;

    public Button reserverButton;

    public void setSpectacleToReserve(SpectacleDto leSpectacle){
        //On récupère le spectacle sélectionné
        this.spectacleToReserve = leSpectacle;

        //On assigne le texte au label
        labelNomSpectacle.setText(spectacleToReserve.getNom());

        for (TarifDto unTarif:spectacleToReserve.getTarifs()) {
            data.add(new SpectacleReservationDto(unTarif.getName(), unTarif.getPrice(), 0));
        }

        TableColumn nomTarifColumn = new TableColumn("Tarifs");
        nomTarifColumn.setCellValueFactory(new PropertyValueFactory<SpectacleReservationDto, String>("tarifName"));

        TableColumn prixTarifColumn = new TableColumn("Prix");
        prixTarifColumn.setCellValueFactory(new PropertyValueFactory<SpectacleReservationDto, String>("tarifPrice"));

        TableColumn nbPlacesReserveColumn = new TableColumn("Nombre de places à réserver");
        nbPlacesReserveColumn.setCellValueFactory(new PropertyValueFactory<SpectacleReservationDto, String>("nbPlacesReserve"));
        nbPlacesReserveColumn.setCellFactory(TextFieldTableCell.forTableColumn(new NumberStringConverter()));

        listeTarifs.setItems(data);
        listeTarifs.setEditable(true);
        listeTarifs.getColumns().addAll(nomTarifColumn, prixTarifColumn, nbPlacesReserveColumn);
        listeTarifs.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
    }

    public void reserverSpectacle() {
        System.out.println("test réserver");
    }

    public void rafraichirPrixTotal(KeyEvent e) {
        if(e.getCode() == KeyCode.ENTER) {

            ObservableList<SpectacleReservationDto> lesReservations = listeTarifs.getItems();

            for (SpectacleReservationDto uneReservation:lesReservations) {
                System.out.println("Prix: " + uneReservation.getTarifPrice());
                System.out.println("Nombre de places à réserver: " + uneReservation.getNbPlacesReserve());
            }
        }
    }
}

这是SpectacleReservationDto类：

public class SpectacleReservationDto {
    private String tarifName;
    private float tarifPrice;
    private int nbPlacesReserve;

    public SpectacleReservationDto(String tarifName, float tarifPrice, int nbPlacesReserve) {
        this.tarifName = tarifName;
        this.tarifPrice = tarifPrice;
        this.nbPlacesReserve = nbPlacesReserve;
    }

    public String getTarifName() {
        return tarifName;
    }

    public void setTarifName(String tarifName) {
        this.tarifName = tarifName;
    }

    public int getNbPlacesReserve() {
        return nbPlacesReserve;
    }

    public void setNbPlacesReserve(int nbPlacesReserve) {
        this.nbPlacesReserve = nbPlacesReserve;
    }

    public float getTarifPrice() {
        return tarifPrice;
    }

    public void setTarifPrice(float tarifPrice) {
        this.tarifPrice = tarifPrice;
    }
}

当我在TableView中编辑值时，会调用rafraichirPrixTotal函数。 那么我怎样才能获得最后编辑的值？

Answer 1

只有getter和setter可用，PropertyValueFactory创建一个不写入项目的属性。要解决这个问题，你可以

1. 使用属性并修复列的类型/使用转换器：

   TableColumn<SpectacleReservationDto, Number> nbPlacesReserveColumn = new TableColumn("Nombre de places à réserver");
   nbPlacesReserveColumn.setCellValueFactory(new PropertyValueFactory<SpectacleReservationDto, Number>("nbPlacesReserve"));
   nbPlacesReserveColumn.setCellFactory(TextFieldTableCell.forTableColumn(new NumberStringConverter(NumberFormat.getIntegerInstance())));
   

   private final IntegerProperty nbPlacesReserve = new SimpleIntegerProperty();
   
   public IntegerProperty nbPlacesReserveProperty() {
       retrun nbPlacesReserve;
   }
   
   public int getNbPlacesReserve() {
       return nbPlacesReserve.get();
   }
   
   public void setNbPlacesReserve(int value) {
       nbPlacesReserve.set(value);
   }
   

2. 或者为列设置onEditCommit处理程序：

   TableColumn<SpectacleReservationDto, Number> nbPlacesReserveColumn = new TableColumn("Nombre de places à réserver");
   nbPlacesReserveColumn.setCellValueFactory(new PropertyValueFactory<SpectacleReservationDto, Number>("nbPlacesReserve"));
   nbPlacesReserveColumn.setCellFactory(TextFieldTableCell.forTableColumn(new NumberStringConverter(NumberFormat.getIntegerInstance())));
   nbPlacesReserveColumn.setOnEditCommit(evt -> evt.getRowValue().setNbPlacesReserve(evt.getNewValue()));