import java.util.HashMap;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class FXApplet extends Application {

    TreeView treeView;
    HashMap<String, TreeItem> grpList = new HashMap<String, TreeItem>();
    HashMap<String, TreeItem> appList = new HashMap<String, TreeItem>();

    @Override
    public void start(Stage primaryStage) {
        BorderPane root = new BorderPane();
        TreeItem rootItem = new TreeItem("RootItem:RT");
        TreeItem grpItem1 = new TreeItem("GRPItem1:GRP");
        grpList.put("GRPItem1:GRP", grpItem1);
        TreeItem ch1Item1 = new TreeItem("GR1Item1:APP");
        TreeItem ch1Item2 = new TreeItem("GR1Item2:APP");
        TreeItem ch1Item3 = new TreeItem("GR1Item3:APP");
        TreeItem ch1Item4 = new TreeItem("GR1Item4:APP");
        appList.put("GR1Item1:APP", ch1Item1);
        appList.put("GR1Item2:APP", ch1Item2);
        appList.put("GR1Item3:APP", ch1Item3);
        appList.put("GR1Item4:APP", ch1Item4);
        grpItem1.getChildren().addAll(ch1Item1, ch1Item2, ch1Item3, ch1Item4);
        TreeItem grpItem2 = new TreeItem("GRPItem2:GRP");
        grpList.put("GRPItem2:GRP", grpItem2);
        TreeItem ch2Item1 = new TreeItem("GR2Item1:APP");
        TreeItem ch2Item2 = new TreeItem("GR2Item2:APP");
        TreeItem ch2Item3 = new TreeItem("GR2Item3:APP");
        TreeItem ch2Item4 = new TreeItem("GR2Item4:APP");
        appList.put("GR2Item1:APP", ch2Item1);
        appList.put("GR2Item2:APP", ch2Item2);
        appList.put("GR2Item3:APP", ch2Item3);
        appList.put("GR2Item4:APP", ch2Item4);
        grpItem2.getChildren().addAll(ch2Item1, ch2Item2, ch2Item3, ch2Item4);
        rootItem.getChildren().addAll(grpItem1, grpItem2);
        treeView = new TreeView();
        treeView.setRoot(rootItem);
        cellFactories();
        root.setCenter(treeView);
        Scene scene = new Scene(root, 1020, 700);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public void cellFactories() {
        treeView.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
            @Override
            public TreeCell<String> call(TreeView<String> stringTreeView) {
                final TreeCell<String> treeCell = new TreeCell<String>() {
                    protected void updateItem(String item, boolean empty) {
                        super.updateItem(item, empty);
                        if (item != null) {
// System.out.println("item is "+item);
                            setText(item.split(":")[0]);
                            setId(item);
                        }
                    }
                };
                return treeCell;
            }

        });
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX application.
     * main() serves only as fallback in case the application can not be
     * launched through deployment artifacts, e.g., in IDEs with limited FX
     * support. NetBeans ignores main().
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}