javafx如何使用复选框获取表视图中的选定行数据

Question

在这个项目中，我无法在控制台输出中获取是否选择了Checkbox数据。

我的代码：

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellEditEvent;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.CheckBoxTableCell;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TableWithCheckbox extends Application {
   final TableView<Player> table = new TableView<Player>();
    ObservableList<Player> data ;
  @Override
  public void start(Stage primaryStage) {
    final BorderPane root = new BorderPane();

    table.setItems(createData());
    final TableColumn<Player, String> firstNameColumn = new TableColumn<>("First Name");
    final TableColumn<Player, String> lastNameColumn = new TableColumn<>("Last Name");
    final TableColumn<Player, Boolean> injuredColumn = new TableColumn<>("Injured");
    firstNameColumn.setCellValueFactory(new PropertyValueFactory<Player, String>("firstName"));
    lastNameColumn.setCellValueFactory(new PropertyValueFactory<Player, String>("lastName"));
    injuredColumn.setCellValueFactory(new PropertyValueFactory<Player, Boolean>("injured"));
    final Callback<TableColumn<Player, Boolean>, TableCell<Player, Boolean>> cellFactory = CheckBoxTableCell.forTableColumn(injuredColumn);
    injuredColumn.setCellFactory(new Callback<TableColumn<Player, Boolean>, TableCell<Player, Boolean>>() {
      @Override
      public TableCell<Player, Boolean> call(TableColumn<Player, Boolean> column) {
        TableCell<Player, Boolean> cell = cellFactory.call(column);
        cell.setAlignment(Pos.CENTER);
        return cell ;
      }
    });
    injuredColumn.setCellFactory(cellFactory);
    injuredColumn.setEditable(true);

    // This appears not to get invoked:
    injuredColumn.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Player,Boolean>>() {
      @Override
      public void handle(CellEditEvent<Player, Boolean> event) {
        System.out.println("Edit commit");
      }
    });

    table.setEditable(true);
    table.getColumns().addAll(firstNameColumn, lastNameColumn, injuredColumn);

    root.setCenter(table);

    Button button = new Button("Dump info");
    button.setOnAction(new EventHandler<ActionEvent>() {
      @Override
      public void handle(ActionEvent event) {
        for (Player p : table.getItems()) {
          System.out.println(p);
        }
        System.out.println();
      }
    }); Button button1 = new Button("add");
    button1.setOnAction(new EventHandler<ActionEvent>() {
      @Override
      public void handle(ActionEvent event) {
  data.add(new Player("hbghj", "hjhbbccc77", true));
      }
    });
    root.setBottom(button); 
    root.setTop(button1);
    primaryStage.setScene(new Scene(root, 400, 600));
    primaryStage.show();    
  }

  public static void main(String[] args) {
    launch(args);
  }

  private ObservableList<Player> createData() {
    List<Player> players = Arrays.asList(
        new Player("Hugo" ,"Lloris", false),
        new Player("Brad", "Friedel", false),
        new Player("Kyle", "Naughton", false),
        new Player("Younes", "Kaboul", true),
        new Player("Benoit", "Assou-Ekotto", false),
        new Player("Jan", "Vertonghen", false),
        new Player("Michael", "Dawson", false),
        new Player("William", "Gallas", true),
        new Player("Kyle", "Walker", false),
        new Player("Scott", "Parker", false),
        new Player("Mousa", "Dembele", false),
        new Player("Sandro", "Cordeiro", true),
        new Player("Tom", "Huddlestone", false),
        new Player("Gylfi","Sigurdsson", false),
        new Player("Gareth", "Bale", false),
        new Player("Aaron", "Lennon", false),
        new Player("Jermane", "Defoe", false),
        new Player("Emmanuel", "Adebayor", true)
    );
  data =  FXCollections.<Player>observableArrayList( 
        new Callback<Player, Observable[]>() {
          @Override
          public Observable[] call(Player player) {
            return new Observable[]{player.injuredProperty()};
          }
        }
    );
    data.addAll(players);
    data.addListener(new ListChangeListener<Player>() {
      @Override
      public void onChanged(
          javafx.collections.ListChangeListener.Change<? extends Player> change) {
        System.out.println("List changed");
        while (change.next()) {
          if (change.wasUpdated()) {
              System.out.println("What code a do here");
        System.out.println();  }
        }
      }
    });
     table.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue observableValue, Object oldValue, Object newValue) {
                //Check whether item is selected and set value of selected item to Label
                if (table.getSelectionModel().getSelectedItem() != null) {
                    TableView.TableViewSelectionModel selectionModel = table.getSelectionModel();
                    ObservableList selectedCells = selectionModel.getSelectedCells();
                    TablePosition tablePosition = (TablePosition) selectedCells.get(0);
                    Object val = tablePosition.getTableColumn().getCellData(newValue);
                    System.out.println("Selected Value " + val);
                    System.out.println("Selected row " + newValue);
       }
            }
        });
    return data ;
  }

  public static class Player {
    private final StringProperty firstName ;
    private final StringProperty lastName ;
    private final BooleanProperty injured ;
    Player(String firstName, String lastName, boolean international) {
      this.firstName = new SimpleStringProperty(this, "firstName", firstName);
      this.lastName = new SimpleStringProperty(this, "lastName", lastName);
      this.injured = new SimpleBooleanProperty(this, "injured", international);
    }
    public String getFirstName() { return firstName.get(); }
    public void setFirstName(String firstName) { this.firstName.set(firstName);}
    public StringProperty firstNameProperty() { return firstName ; }
    public String getLastName() { return lastName.get(); }
    public void setLastName(String lastName) { this.lastName.set(lastName); }
    public StringProperty lastNameProperty() { return lastName ; }    
    public boolean isInjuredl() { return injured.get(); }
    public void setInjured(boolean international) { this.injured.set(international); }
    public BooleanProperty injuredProperty() { return injured ; }
    @Override
    public String toString() {
      return firstName.get() + " " + lastName.get() + (injured.get()?" (injured)":"");
    }
  }
}

它给我的输出像

Selected row: Gareth    Bale

但是它并不能告诉天气复选框是否处于选中状态：

public void onChanged

我需要这样的输出：

 Selected row: Gareth    Bale   true

要么

 Selected row: Gareth    Bale   false

Answer 1

在以下情况下尝试此操作：

  if (change.wasUpdated()) {
      String inj = (data.get(change.getFrom()).injured.getValue())?"injuried":"no longer injuried";
      System.out.println(data.get(change.getFrom()).lastName.getValue() + ", " + 
              data.get(change.getFrom()).firstName.getValue() + "  "
              + "changed his status to " + inj);
      System.out.println();  
  }

请注意 ，仅当播放器受伤时才会显示输出，否则将为空白：

选定的行：Gareth Bale（受伤）

选定的行：Gareth Bale

替换为：

选择的行：Gareth Bale true

选定的行：Gareth Bale错误

您还必须在播放器类中更改此功能：

public String toString() {
  return firstName.get() + " " + lastName.get() + (injured.get()?" true":" false");
}