javafX8初探（树形表格）

本章描述TreeTableView用户组件，这个组件让你能够在列中设计可视化的无限制层级数据。

TreeTableView和TreeView和TableView有共同之处。它结合了两者的功能。

创建一个TreeTableView控件

 

一个基本的TreeTableView的实现可以按照下面的步骤：

1：创建TreeItem

2：创建根节点

3：添加TreeItem到根节点

4：创建一个或多列

5：定义单元格内容

6：创建TreeTableView

7：关联列和TreeTableView

import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableColumn.CellDataFeatures;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableView;
import javafx.stage.Stage;

public class TreeTableViewSample extends Application {

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

    @Override
    public void start(Stage stage) {
        stage.setTitle("Tree Table View Samples");
        final Scene scene = new Scene(new Group(), 200, 400);
        Group sceneRoot = (Group)scene.getRoot();  

        //Creating tree items
        final TreeItem<String> childNode1 = new TreeItem<>("Child Node 1");
        final TreeItem<String> childNode2 = new TreeItem<>("Child Node 2");
        final TreeItem<String> childNode3 = new TreeItem<>("Child Node 3");

        //Creating the root element
        final TreeItem<String> root = new TreeItem<>("Root node");
        root.setExpanded(true);   

        //Adding tree items to the root
        root.getChildren().setAll(childNode1, childNode2, childNode3);        

        //Creating a column
        TreeTableColumn<String,String> column = new TreeTableColumn<>("Column");
        column.setPrefWidth(150);   

        //Defining cell content
        column.setCellValueFactory((CellDataFeatures<String, String> p) -> 
            new ReadOnlyStringWrapper(p.getValue().getValue()));  

        //Creating a tree table view
        final TreeTableView<String> treeTableView = new TreeTableView<>(root);
        treeTableView.getColumns().add(column);
        treeTableView.setPrefWidth(152);
        treeTableView.setShowRoot(true);             
        sceneRoot.getChildren().add(treeTableView);
        stage.setScene(scene);
        stage.show();
    }     
}

 

 

创建了一个简单的树形视图，只有一列，很多时候我们需要多个列。

添加多个列

 

import java.util.Arrays;
import java.util.List;
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.beans.property.SimpleStringProperty;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class TreeTableViewSample extends Application {

    List<Employee> employees = Arrays.<Employee>asList(
        new Employee("Ethan Williams", "[e-mail]"),
        new Employee("Emma Jones", "[e-mail]"),
        new Employee("Michael Brown", "[e-mail]"),
        new Employee("Anna Black", "[e-mail]"),
        new Employee("Rodger York", "[e-mail]"),
        new Employee("Susan Collins", "[e-mail]"));

    private final ImageView depIcon = new ImageView (
            new Image(getClass().getResourceAsStream("department.png"))
    );

    final TreeItem<Employee> root = 
        new TreeItem<>(new Employee("Sales Department", ""), depIcon);
    public static void main(String[] args) {
        Application.launch(TreeTableViewSample.class, args);
    }

    @Override
    public void start(Stage stage) {
        root.setExpanded(true);
        employees.stream().forEach((employee) -> {
            root.getChildren().add(new TreeItem<>(employee));
        });
        stage.setTitle("Tree Table View Sample");
        final Scene scene = new Scene(new Group(), 400, 400);
        scene.setFill(Color.LIGHTGRAY);
        Group sceneRoot = (Group) scene.getRoot();

        TreeTableColumn<Employee, String> empColumn = 
            new TreeTableColumn<>("Employee");
        empColumn.setPrefWidth(150);
        empColumn.setCellValueFactory(
            (TreeTableColumn.CellDataFeatures<Employee, String> param) -> 
            new ReadOnlyStringWrapper(param.getValue().getValue().getName())
        );

        TreeTableColumn<Employee, String> emailColumn = 
            new TreeTableColumn<>("Email");
        emailColumn.setPrefWidth(190);
        emailColumn.setCellValueFactory(
            (TreeTableColumn.CellDataFeatures<Employee, String> param) -> 
            new ReadOnlyStringWrapper(param.getValue().getValue().getEmail())
        );

        TreeTableView<Employee> treeTableView = new TreeTableView<>(root);
        treeTableView.getColumns().setAll(empColumn, emailColumn);
        sceneRoot.getChildren().add(treeTableView);
        stage.setScene(scene);
        stage.show();
    }

    public class Employee {

        private SimpleStringProperty name;
        private SimpleStringProperty email;
        public SimpleStringProperty nameProperty() {
            if (name == null) {
                name = new SimpleStringProperty(this, "name");
            }
            return name;
        }
        public SimpleStringProperty emailProperty() {
            if (email == null) {
                email = new SimpleStringProperty(this, "email");
            }
            return email;
        }
        private Employee(String name, String email) {
            this.name = new SimpleStringProperty(name);
            this.email = new SimpleStringProperty(email);
        }
        public String getName() {
            return name.get();
        }
        public void setName(String fName) {
            name.set(fName);
        }
        public String getEmail() {
            return email.get();
        }
        public void setEmail(String fName) {
            email.set(fName);
        }
    }
}

改变外观

你可以展示出表格菜单按钮，这样用户就可以根据个人需要来打开或关闭列。通过调用treeTableView.setTableMenuButtonVisble(true)

你也可以控制根节点是否显示，通过调用：treeTableView.setShowRoot(false);

管理选择模式

默认的选择模式是SelectionMode.SINGLE

我们可以使用下面的方法，来支持多选。

treeTableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
treeeTableView.getSelectionModel().setCellSelectionEnabled(true);