TableView：调整可见行数 [英] TableView: adjust number of visible rows

问题描述

我正在使用此表在表视图中显示数据：

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);
        }
    }
}

当我更改数量时使用组合框的行仅更改表行中的数据。表高度不变。

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

有没有办法删除空行？

推荐答案

更改tableview的高度并删除空的行是两个不同的东西。请明确点。

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

要删除行，请参阅本教程。

要更改高度，请先设置 fixedCellSizeProperty 然后在绑定中使用它：

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));

添加30px用于tableview的标题。

Adding 30px is for tableview's header.

这篇关于TableView：调整可见行数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！