【发布时间】：2014-02-15 20:58:46
【问题描述】：
我找到了这个 JavaFX 树的例子。
import java.util.Arrays;
import java.util.List;
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TextField;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Callback;
public class MainApp extends Application
{
private final Node rootIcon = new ImageView(new Image(getClass().getResourceAsStream("/images/root.png")));
private final Image depIcon = new Image(getClass().getResourceAsStream("/images/department.png"));
List<Employee> employees = Arrays.<Employee>asList(
new Employee("Ethan Williams", "Sales Department", "Ethan Williams", "Sales Department"),
new Employee("Emma Jones", "Sales Department", "Emma Jones", "Sales Department"),
new Employee("Michael Brown", "Sales Department", "Michael Brown", "Sales Department"),
new Employee("Anna Black", "Sales Department", "Anna Black", "Sales Department"),
new Employee("Rodger York", "Sales Department", "Rodger York", "Sales Department"),
new Employee("Susan Collins", "Sales Department", "Susan Collins", "Sales Department"),
new Employee("Mike Graham", "IT Support", "Mike Graham", "IT Support"),
new Employee("Judy Mayer", "IT Support", "Judy Mayer", "IT Support"),
new Employee("Gregory Smith", "IT Support", "Gregory Smith", "IT Support"),
new Employee("Jacob Smith", "Accounts Department", "Jacob Smith", "Accounts Department"),
new Employee("Isabella Johnson", "Accounts Departmentllzzz", "Isabella Johnson", "Accounts Departmentllzzz"),
new Employee("Isabella Johnson", "Accounts Departmentllzzz", "Isabella Johnson", "Accounts Departmentllzzz"),
new Employee("Isabella Johnson", "Accounts Departmentllzzz", "Isabella Johnson", "Accounts Departmentllzzz"));
TreeItem<String> rootNode = new TreeItem<String>("MyCompany Human Resources", rootIcon);
public static void main(String[] args)
{
Application.launch(args);
}
@Override
public void start(Stage stage)
{
rootNode.setExpanded(true);
for (Employee employee : employees)
{
TreeItem<String> empLeaf = new TreeItem<String>(employee.getName());
boolean found = false;
for (TreeItem<String> depNode : rootNode.getChildren())
{
if (depNode.getValue().contentEquals(employee.getDepartment()))
{
depNode.getChildren().add(empLeaf);
found = true;
break;
}
}
if (!found)
{
TreeItem depNode = new TreeItem(employee.getDepartment(),
new ImageView(depIcon)
);
rootNode.getChildren().add(depNode);
depNode.getChildren().add(empLeaf);
}
}
stage.setTitle("Tree View Sample");
VBox box = new VBox();
final Scene scene = new Scene(box, 400, 300);
scene.setFill(Color.LIGHTGRAY);
TreeView<String> treeView = new TreeView<String>(rootNode);
treeView.setShowRoot(true);
treeView.setEditable(false);
treeView.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>()
{
@Override
public TreeCell<String> call(TreeView<String> p)
{
return new TextFieldTreeCellImpl();
}
});
box.getChildren().add(treeView);
stage.setScene(scene);
stage.show();
}
private final class TextFieldTreeCellImpl extends TreeCell<String>
{
private TextField textField;
private ContextMenu addMenu = new ContextMenu();
public TextFieldTreeCellImpl()
{
MenuItem addMenuItem = new MenuItem("Add Employee");
addMenu.getItems().add(addMenuItem);
addMenuItem.setOnAction(new EventHandler()
{
@Override
public void handle(Event t)
{
TreeItem newEmployee = new TreeItem<String>("New Employee");
getTreeItem().getChildren().add(newEmployee);
}
});
}
@Override
public void startEdit()
{
super.startEdit();
if (textField == null)
{
createTextField();
}
setText(null);
setGraphic(textField);
textField.selectAll();
}
@Override
public void cancelEdit()
{
super.cancelEdit();
setText((String) getItem());
setGraphic(getTreeItem().getGraphic());
}
@Override
public void updateItem(String item, boolean empty)
{
super.updateItem(item, empty);
if (empty)
{
setText(null);
setGraphic(null);
}
else
{
if (isEditing())
{
if (textField != null)
{
textField.setText(getString());
}
setText(null);
setGraphic(textField);
}
else
{
setText(getString());
setGraphic(getTreeItem().getGraphic());
if (!getTreeItem().isLeaf() && getTreeItem().getParent() != null)
{
setContextMenu(addMenu);
}
}
}
}
private void createTextField()
{
textField = new TextField(getString());
textField.setOnKeyReleased(new EventHandler<KeyEvent>()
{
@Override
public void handle(KeyEvent t)
{
if (t.getCode() == KeyCode.ENTER)
{
commitEdit(textField.getText());
}
else if (t.getCode() == KeyCode.ESCAPE)
{
cancelEdit();
}
}
});
}
private String getString()
{
return getItem() == null ? "" : getItem().toString();
}
}
public static class Employee
{
private final SimpleStringProperty name;
private final SimpleStringProperty department;
private final SimpleStringProperty test;
private final SimpleStringProperty testtwo;
private Employee(String name, String department, String test, String testtwo)
{
this.name = new SimpleStringProperty(name);
this.department = new SimpleStringProperty(department);
this.test = new SimpleStringProperty(test);
this.testtwo = new SimpleStringProperty(testtwo);
}
public String getName()
{
return name.get();
}
public void setName(String fName)
{
name.set(fName);
}
public String getDepartment()
{
return department.get();
}
public void setDepartment(String fName)
{
department.set(fName);
}
public String getTest()
{
return test.get();
}
public void setTest(String testd)
{
test.set(testd);
}
public String getTesttwo()
{
return testtwo.get();
}
public void setTesttwo(String fNdme)
{
testtwo.set(fNdme);
}
}
}
原始示例： http://docs.oracle.com/javafx/2/ui_controls/tree-view.htm
如您所见，我测试了扩展树，但这不起作用。我如何使用例如对象列表来显示复杂的树？
【问题讨论】：
-
你必须说出你想对这个对象做什么。我做了一个例子here. TextFieldTreeCellImpl 仅当您想编辑树中的名称时。你可能不需要那个。
-
我试过了，根节点似乎展开了。它以什么方式“不工作”？
标签： java javafx javafx-2 javafx-8