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我想爲JavaFX創建上下文菜單。這是我測試的代碼。但由於某種原因，當我右鍵單擊樹節點時沒有上下文菜單。你能幫我找到我的錯誤嗎？JavaFX樹的上下文菜單
import java.util.Arrays;
import java.util.List;
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.ContextMenuBuilder;
import javafx.scene.control.MenuItemBuilder;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.TextFieldTreeCell;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Callback;
public class MainApp extends Application
{
List<Employee> employees = Arrays.<Employee>asList(
new Employee("New Chassi", "New Datacenter"),
new Employee("New Battery", "New Rack"),
new Employee("New Chassi", "New Server"),
new Employee("Anna Black", "Sales Department"),
new Employee("Rodger York", "Sales Department"),
new Employee("Susan Collins", "Sales Department"),
new Employee("Mike Graham", "IT Support"),
new Employee("Judy Mayer", "IT Support"),
new Employee("Gregory Smith", "IT Support"),
new Employee("Jacob Smith", "Accounts Department"),
new Employee("Isabella Johnson", "Accounts Department"));
TreeItem<String> rootNode = new TreeItem<>("MyCompany Human Resources");
public static void main(String[] args)
{
Application.launch(args);
}
TreeView<String> treeView = new TreeView<>(rootNode);
@Override
public void start(Stage stage)
{
rootNode.setExpanded(true);
for (Employee employee : employees)
{
TreeItem<String> empLeaf = new TreeItem<>(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<String> depNode = new TreeItem<>(
employee.getDepartment()//,new ImageView(depIcon) // Set picture
);
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.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>()
{
@Override
public TreeCell<String> call(TreeView<String> arg0)
{
// custom tree cell that defines a context menu for the root tree item
return new MyTreeCell();
}
});
box.getChildren().add(treeView);
stage.setScene(scene);
stage.show();
}
public static class Employee
{
private final SimpleStringProperty name;
private final SimpleStringProperty department;
private Employee(String name, String department)
{
this.name = new SimpleStringProperty(name);
this.department = new SimpleStringProperty(department);
}
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);
}
}
class MyTreeCell extends TextFieldTreeCell<String>
{
private ContextMenu rootContextMenu;
public MyTreeCell()
{
// instantiate the root context menu
rootContextMenu
= ContextMenuBuilder.create()
.items(
MenuItemBuilder.create()
.text("Menu Item")
.onAction(
new EventHandler<ActionEvent>()
{
@Override
public void handle(ActionEvent arg0)
{
System.out.println("Menu Item Clicked!");
}
}
)
.build()
)
.build();
}
@Override
public void updateItem(String item, boolean empty)
{
super.updateItem(item, empty);
// if the item is not empty and is a root...
if (!empty && getTreeItem().getParent() == null)
{
setContextMenu(rootContextMenu);
}
}
}
}