建立TreeView的設置和實體之間的比較

Question

我想使用TreeView顯示類別和實際內容。我用這個tutorial來跟隨我的例子，因爲他們做了類似的事情，但他們簡化了它。 我有這樣的事情

public class Category { 
    final StringProperty categoryName = new SimpleStringProperty(); 
    final ListProperty<Contact> contactList = new SimpleListProperty<>(FXCollections.<Contact>observableArrayList()); 

    public Category(String name, List<Contact> contactList) { 
     this.categoryName.set(name); 
     this.contactList.setAll(contactList); 
    } 

    public StringProperty categoryNameProperty() { return this.categoryName; } 
    public ListProperty<Contact> contactListProperty() { return this.contactList; } 
} 

public class Contact { 
    final StringProperty contactName = new SimpleStringProperty(); 

    public Contact(String name) { 
     this.contactName.set(name); 
    } 

    public StringProperty contactNameProperty() { return this.contactName; } 
} 

現在我想建立一個TreeView出List<Category>與自動插入子節點的潛在聯繫。這可能嗎？如果可能的話，我想不是修改模型本身。我想延長TreeItem<T>，但我不知道這會給我帶來多大的距離。

Answer 1

好吧我解決了這個，有人通過改變一個更好的解決方案？

public class Main extends Application { 
    @Override 
    public void start(Stage stage) {   
     Scene scene = new Scene(new Group()); 
     stage.setWidth(300); 
     stage.setHeight(500); 

     final TreeView<MailTreeItem> tree = new TreeView<>(); 
     final List<Category> categoryList = FXCollections.observableArrayList(); 

     tree.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem<MailTreeItem>>() { 

      @Override 
      public void changed(
        ObservableValue<? extends TreeItem<MailTreeItem>> observable, 
        TreeItem<MailTreeItem> oldValue, 
        TreeItem<MailTreeItem> newValue) { 

       newValue.getValue(); 

      } 
     }); 

     final List<Contact> categoryContact1List = FXCollections.observableArrayList(); 
     categoryContact1List.add(new Contact("Hans")); 
     categoryContact1List.add(new Contact("Dieter")); 

     final List<Contact> categoryContact2List = FXCollections.observableArrayList(); 
     categoryContact2List.add(new Contact("Peter")); 

     categoryList.add(new Category("Freunde", categoryContact1List)); 
     categoryList.add(new Category("Feinde", categoryContact2List)); 

     final TreeItem<MailTreeItem> root = new TreeItem<MailTreeItem>(new RootTreeItem()); 
     root.setExpanded(true); 
     tree.setRoot(root); 
     for (Category category : categoryList) { 
      final List<Contact> contactList = category.contactListProperty().get(); 
      final TreeItem<MailTreeItem> categoryTreeItem = new TreeItem<MailTreeItem>(new CategoryTreeItem(category)); 

      for (Contact contact : contactList) { 
       categoryTreeItem.getChildren().add(new TreeItem<MailTreeItem>(new ContactTreeItem(contact))); 
      } 
      root.getChildren().add(categoryTreeItem); 
     } 

     final VBox vbox = new VBox(); 
     vbox.setSpacing(5); 
     vbox.setPadding(new Insets(10, 0, 0, 10)); 
     vbox.getChildren().addAll(tree); 

     ((Group) scene.getRoot()).getChildren().addAll(vbox); 

     stage.setScene(scene); 
     stage.show(); 
    } 

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

    public interface MailTreeItem { 
     public boolean isCategory(); 
     public boolean isContact(); 
     public Category getCategory(); 
     public Contact getContact(); 
    } 

    public class RootTreeItem implements MailTreeItem { 
     @Override public String toString() { return "root"; } 
     @Override public boolean isCategory() { return false; } 
     @Override public boolean isContact() { return false; } 
     @Override public Category getCategory() { return null; } 
     @Override public Contact getContact() { return null; }  
    } 

    public class CategoryTreeItem implements MailTreeItem { 
     private ObjectProperty<Category> category = new SimpleObjectProperty<>(); 

     public CategoryTreeItem(Category category) { 
      this.category.set(category); 
     } 

     public ObjectProperty<Category> categoryProperty() { return this.category; } 

     @Override public String toString() { return this.category.get().categoryNameProperty().get(); } 
     public boolean isCategory() { return true; } 
     public boolean isContact() { return false; } 
     public Category getCategory() { return this.category.get(); } 
     public Contact getContact() { return null; } 
    } 

    public class ContactTreeItem implements MailTreeItem { 
     private final ObjectProperty<Contact> contact = new SimpleObjectProperty<>(); 

     public ContactTreeItem(Contact contact) { 
      this.contact.set(contact); 
     } 

     public ObjectProperty<Contact> contactProperty() { return this.contact; } 

     @Override public String toString() { return this.contact.get().contactNameProperty().get(); } 
     public boolean isCategory() { return false; } 
     public boolean isContact() { return true; } 
     public Category getCategory() { return null; } 
     public Contact getContact() { return this.contact.get(); } 
    } 

    public class Category { 
     private final StringProperty categoryName = new SimpleStringProperty(); 
     private final ListProperty<Contact> contactList = new SimpleListProperty<>(FXCollections.<Contact>observableArrayList()); 

     public Category(String name, List<Contact> contactList) { 
      this.categoryName.set(name); 
      this.contactList.setAll(contactList); 
     } 

     public StringProperty categoryNameProperty() { return this.categoryName; } 
     public ListProperty<Contact> contactListProperty() { return this.contactList; } 
    } 

    public class Contact { 
     private final StringProperty contactName = new SimpleStringProperty(); 

     public Contact(String name) { 
      this.contactName.set(name); 
     } 

     public StringProperty contactNameProperty() { return this.contactName; } 
    } 
}