javafx - TableView: adjust number of visible rows

Question

I'm using this table to display data in Table View:

import javafx.application.Application;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Pagination;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class MainApp extends Application
{
    IntegerProperty intP = new SimpleIntegerProperty(5);
    AnchorPane anchor = new AnchorPane();
    Scene scene;
    ObservableList<Integer> options
        = FXCollections.observableArrayList(
            5,
            10,
            15,
            20);
    final ComboBox comboBox = new ComboBox(options);
    final ObservableList<Person> data = FXCollections.observableArrayList(
        new Person("1", "Joe", "Pesci"),
        new Person("2", "Audrey", "Hepburn"),
        new Person("3", "Gregory", "Peck"),
        new Person("4", "Cary", "Grant"),
        new Person("5", "De", "Niro"),
        new Person("6", "Katharine", "Hepburn"),
        new Person("7", "Jack", "Nicholson"),
        new Person("8", "Morgan", "Freeman"),
        new Person("9", "Elizabeth", "Taylor"),
        new Person("10", "Marcello", "Mastroianni"),
        new Person("11", "Innokenty", "Smoktunovsky"),
        new Person("12", "Sophia", "Loren"),
        new Person("13", "Alexander", "Kalyagin"),
        new Person("14", "Peter", "OToole"),
        new Person("15", "Gene", "Wilder"),
        new Person("16", "Evgeny", "Evstegneev"),
        new Person("17", "Michael", "Caine"),
        new Person("18", "Jean-Paul", "Belmondo"),
        new Person("19", " Julia", "Roberts"),
        new Person("20", "James", "Stewart"),
        new Person("21", "Sandra", "Bullock"),
        new Person("22", "Paul", "Newman"),
        new Person("23", "Oleg", "Tabakov"),
        new Person("24", "Mary", "Steenburgen"),
        new Person("25", "Jackie", "Chan"),
        new Person("26", "Rodney", "Dangerfield"),
        new Person("27", "Betty", "White"),
        new Person("28", "Eddie", "Murphy"),
        new Person("29", "Amitabh", "Bachchan"),
        new Person("30", "Nicole", "Kidman"),
        new Person("31", "Adriano", "Celentano"),
        new Person("32", "Rhonda", " Fleming's"),
        new Person("32", "Humphrey", "Bogart"));
    private Pagination pagination;

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

    public int itemsPerPage()
    {
        return 1;
    }

    public int rowsPerPage()
    {
        return intP.get();
    }

    public VBox createPage(int pageIndex)
    {
        int lastIndex = 0;
        int displace = data.size() % rowsPerPage();
        if (displace > 0)
        {
            lastIndex = data.size() / rowsPerPage();
        }
        else
        {
            lastIndex = data.size() / rowsPerPage() - 1;
        }
        VBox box = new VBox();
        int page = pageIndex * itemsPerPage();
        for (int i = page; i < page + itemsPerPage(); i++)
        {
            TableView<Person> table = new TableView<>();

            TableColumn numCol = new TableColumn("ID");
            numCol.setCellValueFactory(new PropertyValueFactory<>("num"));
            numCol.setMinWidth(20);
            TableColumn firstNameCol = new TableColumn("First Name");
            firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));

            firstNameCol.setMinWidth(160);
            TableColumn lastNameCol = new TableColumn("Last Name");
            lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
            lastNameCol.setMinWidth(160);
            table.getColumns().addAll(numCol, firstNameCol, lastNameCol);
            if (lastIndex == pageIndex)
            {
                table.setItems(FXCollections.observableArrayList(data.subList(pageIndex * rowsPerPage(), pageIndex * rowsPerPage() + displace)));
            }
            else
            {
                table.setItems(FXCollections.observableArrayList(data.subList(pageIndex * rowsPerPage(), pageIndex * rowsPerPage() + rowsPerPage())));
            }

            box.getChildren().addAll(table);

        }
        return box;
    }

    @Override
    public void start(final Stage stage) throws Exception
    {
        scene = new Scene(anchor, 450, 450);
        comboBox.valueProperty().addListener(new ChangeListener<Number>()
        {
            @Override
            public void changed(ObservableValue o, Number oldVal, Number newVal)
            {
                //System.out.println(newVal.intValue());
                intP.set(newVal.intValue());
                paginate();
            }
        });
        paginate();
        stage.setScene(scene);
        stage.setTitle("Table pager");
        stage.show();
    }

    public void paginate()
    {
        pagination = new Pagination((data.size() / rowsPerPage() + 1), 0);
        //   pagination = new Pagination(20 , 0);
//        pagination.setStyle("-fx-border-color:red;");
        pagination.setPageFactory(new Callback<Integer, Node>()
        {
            @Override
            public Node call(Integer pageIndex)
            {
                if (pageIndex > data.size() / rowsPerPage() + 1)
                {
                    return null;
                }
                else
                {
                    return createPage(pageIndex);
                }
            }
        });

        AnchorPane.setTopAnchor(pagination, 10.0);
        AnchorPane.setRightAnchor(pagination, 10.0);
        AnchorPane.setBottomAnchor(pagination, 10.0);
        AnchorPane.setLeftAnchor(pagination, 10.0);

        AnchorPane.setBottomAnchor(comboBox, 40.0);
        AnchorPane.setLeftAnchor(comboBox, 12.0);
        anchor.getChildren().clear();
        anchor.getChildren().addAll(pagination, comboBox);
    }

    public static class Person
    {
        private final SimpleStringProperty num;
        private final SimpleStringProperty firstName;
        private final SimpleStringProperty lastName;

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

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

        public void setFirstName(String fName)
        {
            firstName.set(fName);
        }

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

        public void setLastName(String fName)
        {
            lastName.set(fName);
        }

        public String getNum()
        {
            return num.get();
        }

        public void setNum(String id)
        {
            num.set(id);
        }
    }
}

When I change the number of rows using Combo box only data in table rows is changed. Table height is not changed.

Is there a way to remove empty rows?

Answer 1

Changing tableview's height and removing "empty" rows are two different things. Be specific.

For removing rows see this tutorial.

For changing height, first set the fixedCellSizeProperty of the table view then use it in binding:

table.setFixedCellSize(25);
table.prefHeightProperty().bind(Bindings.size(table.getItems()).multiply(table.getFixedCellSize()).add(30));

Adding 30px is for tableview's header.