Question

我想在TitlePana中添加几个TreeView。

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。任何想法都是代码问题吗？

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);
    }
}

在TitlePane中添加内容

1 个答案: