javafx如何使用复选框在表视图中获取选定的行数据

Question

在这个项目中，我无法在控制台输出中获取复选框数据是否被选中。

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)":"");
    }
  }
}

它给了我这样的输出

Selected row: Gareth    Bale

但它不告诉天气复选框是否被选中：

public void onChanged

我需要这样的输出：

 Selected row: Gareth    Bale   true

或

 Selected row: Gareth    Bale   false

Answer 1

在你的 if 上试试这个：

  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();  
  }

注意输出只有在玩家受伤时才会显示，否则它将是空白的：

选定行：加雷斯·贝尔（受伤）

所选行：加雷斯·贝尔

将其替换为：

所选行：Gareth Bale true

所选行：Gareth Bale false

您还必须在播放器类中更改此函数：

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