JavaFX:当用户选中复选框时，CheckBoxTableCell 获取 ActionEvent

Question

我想在用户选中或取消选中 tableView 中的复选框时触发方法或操作。当用户使用 checkBox 时， coursData.addListener(...) 不会被触发。

这是我编译的代码，窗口显示带有复选框的 tableView。

package testCheckBox2;

import javafx.application.Application;
import javafx.beans.InvalidationListener;
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.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonBase;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.CheckBoxTableCell;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;


public class CheckBoxTableCellTest extends Application {

  private TableView<cours> tableView;

  public ObservableList<cours> coursData ;//= FXCollections.observableArrayList();
  @Override

  public void start(Stage primaryStage) {

      this.tableView = new TableView<cours>();
      final TableColumn<cours, String> Cours = new TableColumn<cours, String>("Cours");
      final TableColumn<cours, Boolean> checkedCol = new TableColumn<cours, Boolean>("Checked");

      this.coursData  =FXCollections.observableArrayList(
                new cours("Analyse", "3"), 
                new cours("Analyse TP", "4"), 
                new cours("Thermo", "5"),
                new cours("Thermo TP", "7"),
                new cours("Chimie", "8"));

    tableView.setItems(this.coursData);

    tableView.getColumns().addAll(Cours, checkedCol);

    Cours.setCellValueFactory(new PropertyValueFactory<cours, String>("cours"));

    checkedCol.setCellValueFactory(new PropertyValueFactory<cours, Boolean>("checked"));

    checkedCol.setCellFactory(CheckBoxTableCell.forTableColumn(checkedCol));
    checkedCol.setEditable(true);
    tableView.setEditable(true);

    final BorderPane root = new BorderPane();
    root.setCenter(tableView);

    coursData.addListener(new InvalidationListener() {

        @Override public void invalidated(Observable o) {
                System.out.println("checkBox change state ");
                //Here is my problem. 
                //When the user click on a checkBox , the method isn't call .
            }
        });
Scene scene = new Scene(root, 300, 400);
    primaryStage.setScene(scene);
    primaryStage.show();
  }

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

  public static class cours {
    private StringProperty cours;
    private StringProperty coursID;
    private BooleanProperty checked;

    public cours(String cours, String coursID) {
      this.cours = new SimpleStringProperty(cours);
      this.coursID = new SimpleStringProperty(coursID);
      this.checked = new SimpleBooleanProperty(false);
    }

    public String getCours() {
      return cours.get();
    }

    public String getCoursID() {
      return coursID.get();
    }

    public boolean isChecked() {
      return checked.get();
    }

    public void setCours(String cours) {
      this.cours.set(cours);
    }

    public void setCoursID(String coursID) {
      this.coursID.set(coursID);
    }

    public void setChecked(boolean checked) {
      this.checked.set(checked);
    }

    public StringProperty coursProperty() {
      return cours;
    }

    public StringProperty coursIDProperty() {
      return coursID;
    }

    public BooleanProperty checkedProperty() {
      return checked;
    }
  }
}

Answer 1

您可以通过两种方式在单击任何复选框时收到通知。

一:为 CheckBoxTableCell.forTableColumn 而不是 tableColumn 提供回调作为参数:

checkedCol.setCellFactory(CheckBoxTableCell.forTableColumn(new Callback<Integer, ObservableValue<Boolean>>() {

    @Override
    public ObservableValue<Boolean> call(Integer param) {
        System.out.println("Cours "+items.get(param).getCours()+" changed value to " +items.get(param).isChecked());
        return items.get(param).checkedProperty();
    }
}));

二:为集合提供回调:

final List<Cours> items=Arrays.asList(new Cours("Analyse", "3"), 
          new Cours("Analyse TP", "4"), 
          new Cours("Thermo", "5"),
          new Cours("Thermo TP", "7"),
          new Cours("Chimie", "8"));
this.coursData = FXCollections.observableArrayList(new Callback<Cours, Observable[]>() {

    @Override
    public Observable[] call(Cours param) {
        return new Observable[] {param.checkedProperty()};
    }
});
coursData.addAll(items);

现在监听集合中的变化:

coursData.addListener(new ListChangeListener<Cours>() {

    @Override
    public void onChanged(ListChangeListener.Change<? extends Cours> c) {
        while (c.next()) {
            if (c.wasUpdated()) {
                System.out.println("Cours "+items.get(c.getFrom()).getCours()+" changed value to " +items.get(c.getFrom()).isChecked());
            }
          }
    }
});