package sample;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckBoxTreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.CheckBoxTreeCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Tree View Sample");
        TreeView<String> tree = new TreeView<>(new CheckBoxTreeItem<>("root"));
        fillTree(tree);
        StackPane root = new StackPane();
        root.getChildren().add(tree);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }

    private void fillTree(TreeView<String> treeView) {
        treeView.setCellFactory(p -> new CheckBoxTreeCell<>());
        for (int i = 0; i < 20000; i++) {
            CheckBoxTreeItem checkBoxTreeItem = new CheckBoxTreeItem<>(i);
            treeView.getRoot().getChildren().add(checkBoxTreeItem);
            for (int j = 0; j < 10; j++) {
                checkBoxTreeItem.getChildren().add(new CheckBoxTreeItem<>(j));
            }
        }
    }


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