javafx - 迭代 TreeView 节点

Question

我正在使用此代码迭代所有 TreeView 节点。

for (TreeItem<DynamicTreeNodeModel> children1 : children)
                {
                    ObservableList<TreeItem<DynamicTreeNodeModel>> children2 = children1.getChildren();

                    for (TreeItem<DynamicTreeNodeModel> children3 : children2)
                    {
                        ObservableList<TreeItem<DynamicTreeNodeModel>> children4 = children3.getChildren();

                        TreeItem<DynamicTreeNodeModel> tempValue = null;

                        for (TreeItem<DynamicTreeNodeModel> children5 : children4)
                        {
                            // some logic
                        }
                    }
                }

有没有更好的方法来访问 TreeView 的低级节点？

Answer 1

您可以只使用递归方法，检查当前节点是否有子节点。如果有，它会再次调用相同的方法，否则它会打印该节点。

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class IterateTree extends Application {


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

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Tree View Sample");        

        TreeItem<String> rootItem = new TreeItem<String> ("Inbox");
        rootItem.setExpanded(true);
        for (int i = 1; i < 5; i++) {
            rootItem.getChildren().add(createTreeItem(i));
        }        
        TreeView<String> tree = new TreeView<String> (rootItem);        
        StackPane root = new StackPane();
        root.getChildren().add(tree);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
        // print children
        printChildren(rootItem);
    }

    private TreeItem<String> createTreeItem(int num) {
        TreeItem<String> rootItem = new TreeItem<String> ("Group " + num);
        for (int i = 1; i < 6; i++) {
            TreeItem<String> item = new TreeItem<String> ("Message" + i);            
            rootItem.getChildren().add(item);
        }
        return rootItem;
    }

    private void printChildren(TreeItem<String> root){
        System.out.println("Current Parent :" + root.getValue());
        for(TreeItem<String> child: root.getChildren()){
            if(child.getChildren().isEmpty()){
                System.out.println(child.getValue());
            } else {
                printChildren(child);
            }
        }
    }
}