Create the tree item on the fly : TreeView « JavaFX « Java

1. Java
2. JavaFX
3. TreeView

Create the tree item on the fly

 

import java.io.File;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
  public static void main(String[] args) {
    launch(args);
  }
  private TreeItem<File> createNode(final File f) {
    return new TreeItem<File>(f) {
        private boolean isLeaf;
        private boolean isFirstTimeChildren = true;
        private boolean isFirstTimeLeaf = true;
         
        @Override public ObservableList<TreeItem<File>> getChildren() {
            if (isFirstTimeChildren) {
                isFirstTimeChildren = false;
                super.getChildren().setAll(buildChildren(this));
            }
            return super.getChildren();
        }

        @Override public boolean isLeaf() {
            if (isFirstTimeLeaf) {
                isFirstTimeLeaf = false;
                File f = (File) getValue();
                isLeaf = f.isFile();
            }

            return isLeaf;
        }

        private ObservableList<TreeItem<File>> buildChildren(TreeItem<File> TreeItem) {
            File f = TreeItem.getValue();
            if (f != null && f.isDirectory()) {
                File[] files = f.listFiles();
                if (files != null) {
                    ObservableList<TreeItem<File>> children = FXCollections.observableArrayList();

                    for (File childFile : files) {
                        children.add(createNode(childFile));
                    }

                    return children;
                }
            }

            return FXCollections.emptyObservableList();
        }
    };
}
  @Override
  public void start(Stage stage) {
    Scene scene = new Scene(new Group());
    stage.setTitle("Sample");
    stage.setWidth(300);
    stage.setHeight(190);

    VBox vbox = new VBox();
    vbox.setLayoutX(20);
    vbox.setLayoutY(20);
    
    TreeItem<File> root = createNode(new File("/"));
    TreeView treeView = new TreeView<File>(root);

    

    vbox.getChildren().add(treeView);
    vbox.setSpacing(10);
    ((Group) scene.getRoot()).getChildren().add(vbox);

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

   
  

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