JavaFx:禁用 first/last 列的重新排序

JavaFx: disable reordering for first/last column

我想禁用对 tableView 中第一列或最后一列的重新排序。 我可以通过两种方式禁用第一列或最后一列,因此我无法移动 first/last 列,但两种方式都可以让我将另一列拖到 first/last 位置。我该如何防止这种情况。我想以某种方式在其中放置一个 "barrier",以便始终有一个固定的列。

我如何禁用第一个列:

firstColumn.impl_setReorderable(false); // I know the method is @Deprecated  but it works :)

另一种解决方案是通过反射获取 TableHeaderRow 的引用,然后禁用重新排序。但是这个解决方案的问题是,它禁用了所有列的重新排序,而我只想要第一个或最后一个列。

任何简单的想法我怎样才能做这样的事情?

您可以 'let' 进行重新排序,然后监听更改,在活动结束时您可以按照自己喜欢的方式重新排列列。 post 关于重新排序列的一个非常有用的方法是 this 一个(好吧,您应该考虑看看有很多好的答案)。因此,您可以向 table 的皮肤 属性 添加一个侦听器,并在内部执行以下操作:

table.skinProperty().addListener((obs, oldSkin, newSkin) -> {
    final TableHeaderRow header = (TableHeaderRow) table.lookup("TableHeaderRow");
    header.reorderingProperty().addListener((o, oldVal, newVal) -> {
        ObservableList columns = table.getColumns();

        // If the first columns is not in the first index change it
        if (columns.indexOf(firstNameCol) != 0) {
                columns.remove(firstNameCol);
                columns.add(0, firstNameCol);
            }
        // Use the same logic for the last column
        if (columns.indexOf(phoneCol) != columns.size() - 1) {
            columns.remove(phoneCol);
            columns.add(columns.size() , phoneCol);
        }
    });
});

这是一个完整的工作示例:

import com.sun.javafx.scene.control.skin.TableHeaderRow;

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;

public class TestApp extends Application {

    private TableView<Person> table = new TableView<Person>();
    private final ObservableList<Person> data = FXCollections.observableArrayList(
            new Person("Jacob", "Smith", "jacob.smith@example.com", "845-548-600"),
            new Person("Isabella", "Johnson", "isabella.johnson@example.com", "455-777-645"),
            new Person("Ethan", "Williams", "ethan.williams@example.com", "888-504-254"),
            new Person("Emma", "Jones", "emma.jones@example.com", "123-548-350"),
            new Person("Michael", "Brown", "michael.brown@example.com", "650-120-600"));

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

    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new Group());
        stage.setTitle("Table View Sample");
        stage.setWidth(550);
        stage.setHeight(500);

        final Label label = new Label("Address Book");
        label.setFont(new Font("Arial", 20));

        table.setEditable(true);

        TableColumn firstNameCol = new TableColumn("First Name");
        firstNameCol.setMinWidth(100);
        firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));

        TableColumn lastNameCol = new TableColumn("Last Name");
        lastNameCol.setMinWidth(100);
        lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));

        TableColumn emailCol = new TableColumn("Email");
        emailCol.setMinWidth(200);
        emailCol.setCellValueFactory(new PropertyValueFactory<Person, String>("email"));

        TableColumn phoneCol = new TableColumn("Phone");
        phoneCol.setMinWidth(100);
        phoneCol.setCellValueFactory(new PropertyValueFactory<Person, String>("phone"));

        table.setItems(data);
        table.getColumns().addAll(firstNameCol, lastNameCol, emailCol, phoneCol);

        table.skinProperty().addListener((obs, oldSkin, newSkin) -> {
            final TableHeaderRow header = (TableHeaderRow) table.lookup("TableHeaderRow");
            header.reorderingProperty().addListener((o, oldVal, newVal) -> {
                ObservableList columns = table.getColumns();

                // If the first columns is not in the first index change it
                if (columns.indexOf(firstNameCol) != 0) {
                    columns.remove(firstNameCol);
                    columns.add(0, firstNameCol);
                }
                // Use the same logic for the last column
                if (columns.indexOf(phoneCol) != columns.size() - 1) {
                    columns.remove(phoneCol);
                    columns.add(columns.size(), phoneCol);
                }
            });
        });

        final VBox vbox = new VBox();
        vbox.setSpacing(5);
        vbox.setPadding(new Insets(10, 0, 0, 10));
        vbox.getChildren().addAll(label, table);

        ((Group) scene.getRoot()).getChildren().addAll(vbox);

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

    public static class Person {

        private final SimpleStringProperty firstName;
        private final SimpleStringProperty lastName;
        private final SimpleStringProperty email;
        private final SimpleStringProperty phone;

        private Person(String fName, String lName, String email, String phone) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
            this.email = new SimpleStringProperty(email);
            this.phone = new SimpleStringProperty(phone);
        }

        public String getPhone() {
            return phone.get();
        }

        public String getFirstName() {
            return firstName.get();
        }

        public String getLastName() {
            return lastName.get();
        }

        public String getEmail() {
            return email.get();
        }

    }
}

您还可以添加 firstNameCol.impl_setReorderable(false);phoneCol.impl_setReorderable(false); 以防止拖动第一列和最后一列。