向 Tableview 新增按鈕

你可以使用列 setCellFactory(Callback value) 方法向 Tableview 新增按鈕或其他 javafx 元件。

樣品申請

在這個應用程式中，我們將向 TableView 新增一個按鈕。單擊此列按鈕時，將選擇與按鈕相同的行上的資料並列印其資訊。

在 addButtonToTable() 方法中，cellFactory 回撥負責向相關列新增按鈕。我們定義了可呼叫的 cellFactory 並實現了它的覆蓋 call(...) 方法，用按鈕獲取 TableCell 然後將此 cellFactory 設定為相關的列 setCellFactory(..) 方法。在我們的樣本中，這是 colBtn.setCellFactory(cellFactory)。SSCCE 如下：

import javafx.application.Application;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TableViewSample extends Application {

    private final TableView<Data> table = new TableView<>();
    private final ObservableList<Data> tvObservableList = FXCollections.observableArrayList();

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

    @Override
    public void start(Stage stage) {

        stage.setTitle("Tableview with button column");
        stage.setWidth(600);
        stage.setHeight(600);

        setTableappearance();

        fillTableObservableListWithSampleData();
        table.setItems(tvObservableList);

        TableColumn<Data, Integer> colId = new TableColumn<>("ID");
        colId.setCellValueFactory(new PropertyValueFactory<>("id"));

        TableColumn<Data, String> colName = new TableColumn<>("Name");
        colName.setCellValueFactory(new PropertyValueFactory<>("name"));

        table.getColumns().addAll(colId, colName);

        addButtonToTable();

        Scene scene = new Scene(new Group(table));

        stage.setScene(scene);
        stage.show();
    }

    private void setTableappearance() {
        table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
        table.setPrefWidth(600);
        table.setPrefHeight(600);
    }

    private void fillTableObservableListWithSampleData() {

        tvObservableList.addAll(new Data(1, "app1"),
                                new Data(2, "app2"), 
                                new Data(3, "app3"), 
                                new Data(4, "app4"),
                                new Data(5, "app5"));
    }

    private void addButtonToTable() {
        TableColumn<Data, Void> colBtn = new TableColumn("Button Column");

        Callback<TableColumn<Data, Void>, TableCell<Data, Void>> cellFactory = new Callback<TableColumn<Data, Void>, TableCell<Data, Void>>() {
            @Override
            public TableCell<Data, Void> call(final TableColumn<Data, Void> param) {
                final TableCell<Data, Void> cell = new TableCell<Data, Void>() {

                    private final Button btn = new Button("Action");

                    {
                        btn.setOnAction((ActionEvent event) -> {
                            Data data = getTableView().getItems().get(getIndex());
                            System.out.println("selectedData: " + data);
                        });
                    }

                    @Override
                    public void updateItem(Void item, boolean empty) {
                        super.updateItem(item, empty);
                        if (empty) {
                            setGraphic(null);
                        } else {
                            setGraphic(btn);
                        }
                    }
                };
                return cell;
            }
        };

        colBtn.setCellFactory(cellFactory);

        table.getColumns().add(colBtn);

    }

    public class Data {

        private int id;
        private String name;

        private Data(int id, String name) {
            this.id = id;
            this.name = name;
        }

        public int getId() {
            return id;
        }

        public void setId(int ID) {
            this.id = ID;
        }

        public String getName() {
            return name;
        }

        public void setName(String nme) {
            this.name = nme;
        }

        @Override
        public String toString() {
            return "id: " + id + " - " + "name: " + name;
        }

    }
}

截圖：