在TitlePane中添加内容

Question

我想将几个TreeView添加到TitlePana中。

private static TitledPane pane = new TitledPane("Connections", null); 


public static void initTree(String name) 
    { 
     pane.setContent(tree(name)); 
    } 

pane.setContent(<node>); 

但是当我添加TreeView时，新节点总是替换旧节点。这是一个设计问题。任何想法是这是一个代码问题？

Answer 1

将标题窗格的内容设置为某个布局窗格，然后将树视图添加到布局窗格。

import java.util.ArrayList; 
import java.util.List; 
import java.util.Random; 

import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.TitledPane; 
import javafx.scene.control.TreeItem; 
import javafx.scene.control.TreeView; 
import javafx.scene.layout.BorderPane; 
import javafx.scene.layout.VBox; 
import javafx.stage.Stage; 

public class TreesInATitledPane extends Application { 

    @Override 
    public void start(Stage primaryStage) { 

     final TitledPane titledPane = new TitledPane(); 
     titledPane.setText("Trees"); 

     final VBox forest = new VBox(5); 

     final int NUM_TREES = 4 ; 
     for (int i=1; i<= NUM_TREES; i++) { 
      forest.getChildren().add(createRandomTree("Tree "+i)); 
     } 

     titledPane.setContent(forest); 

     final BorderPane root = new BorderPane(); 
     root.setTop(titledPane); 
     final Scene scene = new Scene(root, 300, 600); 
     primaryStage.setTitle("Can't see the forest for the trees"); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

    public TreeView<String> createRandomTree(String prefix) { 
     final Random rng = new Random(); 
     List<TreeItem<String>> nodes = new ArrayList<>(); 
     TreeItem<String> root = new TreeItem<>(prefix + " Root"); 
     root.setExpanded(true); 
     nodes.add(root); 
     for (int i=1 ; i < 15; i++) { 
      final TreeItem<String> treeItem = new TreeItem<>(prefix + " Item "+i); 
      treeItem.setExpanded(true); 
      nodes.get(rng.nextInt(i)).getChildren().add(treeItem);    
      nodes.add(treeItem); 
     } 
     TreeView<String> tree = new TreeView<>(root); 
     return tree ; 
    } 

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