JavaFX GridPane layout builder

import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.VPos;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.SplitPane;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

class GridPaneControlPanel extends GridPane {
   public GridPaneControlPanel(final GridPane targetGridPane) {
      super();//from w ww  .  j  av  a 2 s .  c om

      setPadding(new Insets(5));
      setHgap(5);
      setVgap(5);

      // Setting Grid lines
      Label gridLinesLbl = new Label("Grid Lines");
      final ToggleButton gridLinesToggle = new ToggleButton("Off");
      gridLinesToggle.selectedProperty()
            .addListener((ObservableValue<? extends Boolean> ov, Boolean oldValue, Boolean newVal) -> {
               targetGridPane.setGridLinesVisible(newVal);
               gridLinesToggle.setText(newVal ? "On" : "Off");
            });

      // toggle grid lines label
      GridPane.setHalignment(gridLinesLbl, HPos.RIGHT);
      add(gridLinesLbl, 0, 0);

      // toggle grid lines
      GridPane.setHalignment(gridLinesToggle, HPos.LEFT);
      add(gridLinesToggle, 1, 0);

      // Setting padding [top]
      Label gridPaddingLbl = new Label("Top Padding");

      final Slider gridPaddingSlider = new Slider();
      gridPaddingSlider.setMin(0);
      gridPaddingSlider.setMax(100);
      gridPaddingSlider.setValue(5);
      gridPaddingSlider.setShowTickLabels(true);
      gridPaddingSlider.setShowTickMarks(true);
      gridPaddingSlider.setMinorTickCount(1);
      gridPaddingSlider.setBlockIncrement(5);

      gridPaddingSlider.valueProperty()
            .addListener((ObservableValue<? extends Number> ov, Number oldVal, Number newVal) -> {
               double top1 = targetGridPane.getInsets().getTop();
               double right1 = targetGridPane.getInsets().getRight();
               double bottom1 = targetGridPane.getInsets().getBottom();
               double left1 = targetGridPane.getInsets().getLeft();
               Insets newInsets = new Insets((double) newVal, right1, bottom1, left1);
               targetGridPane.setPadding(newInsets);
            });

      // padding adjustment label
      GridPane.setHalignment(gridPaddingLbl, HPos.RIGHT);
      add(gridPaddingLbl, 0, 1);

      // padding adjustment slider
      GridPane.setHalignment(gridPaddingSlider, HPos.LEFT);
      add(gridPaddingSlider, 1, 1);

      // Setting padding [top]
      Label gridPaddingLeftLbl = new Label("Left Padding");

      final Slider gridPaddingLeftSlider = new Slider();
      gridPaddingLeftSlider.setMin(0);
      gridPaddingLeftSlider.setMax(100);
      gridPaddingLeftSlider.setValue(5);
      gridPaddingLeftSlider.setShowTickLabels(true);
      gridPaddingLeftSlider.setShowTickMarks(true);
      gridPaddingLeftSlider.setMinorTickCount(1);
      gridPaddingLeftSlider.setBlockIncrement(5);

      gridPaddingLeftSlider.valueProperty()
            .addListener((ObservableValue<? extends Number> ov, Number oldVal, Number newVal) -> {
               double top1 = targetGridPane.getInsets().getTop();
               double right1 = targetGridPane.getInsets().getRight();
               double bottom1 = targetGridPane.getInsets().getBottom();
               Insets newInsets = new Insets(top1, right1, bottom1, (double) newVal);
               targetGridPane.setPadding(newInsets);
            });

      // padding adjustment label
      GridPane.setHalignment(gridPaddingLeftLbl, HPos.RIGHT);
      add(gridPaddingLeftLbl, 0, 2);

      // padding adjustment slider
      GridPane.setHalignment(gridPaddingLeftSlider, HPos.LEFT);
      add(gridPaddingLeftSlider, 1, 2);

      // Horizontal gap
      Label gridHGapLbl = new Label("Horizontal Gap");

      final Slider gridHGapSlider = new Slider();
      gridHGapSlider.setMin(0);
      gridHGapSlider.setMax(100);
      gridHGapSlider.setValue(5);
      gridHGapSlider.setShowTickLabels(true);
      gridHGapSlider.setShowTickMarks(true);
      gridHGapSlider.setMinorTickCount(1);
      gridHGapSlider.setBlockIncrement(5);

      gridHGapSlider.valueProperty()
            .addListener((ObservableValue<? extends Number> ov, Number oldVal, Number newVal) -> {
               targetGridPane.setHgap((double) newVal);
            });

      // hgap label
      GridPane.setHalignment(gridHGapLbl, HPos.RIGHT);
      add(gridHGapLbl, 0, 3);

      // hgap slider
      GridPane.setHalignment(gridHGapSlider, HPos.LEFT);
      add(gridHGapSlider, 1, 3);

      // Vertical gap
      Label gridVGapLbl = new Label("Vertical Gap");

      final Slider gridVGapSlider = new Slider();
      gridVGapSlider.setMin(0);
      gridVGapSlider.setMax(100);
      gridVGapSlider.setValue(5);
      gridVGapSlider.setShowTickLabels(true);
      gridVGapSlider.setShowTickMarks(true);
      gridVGapSlider.setMinorTickCount(1);
      gridVGapSlider.setBlockIncrement(5);

      gridVGapSlider.valueProperty()
            .addListener((ObservableValue<? extends Number> ov, Number oldVal, Number newVal) -> {
               targetGridPane.setVgap((double) newVal);
            });

      // vgap label
      GridPane.setHalignment(gridVGapLbl, HPos.RIGHT);
      add(gridVGapLbl, 0, 4);

      // vgap slider
      GridPane.setHalignment(gridVGapSlider, HPos.LEFT);
      add(gridVGapSlider, 1, 4);

      // Cell Column
      Label cellCol = new Label("Cell Column");
      final TextField cellColFld = new TextField("0");

      // cell Column label
      GridPane.setHalignment(cellCol, HPos.RIGHT);
      add(cellCol, 0, 5);

      // cell Column field
      GridPane.setHalignment(cellColFld, HPos.LEFT);
      add(cellColFld, 1, 5);

      // Cell Row
      Label cellRowLbl = new Label("Cell Row");
      final TextField cellRowFld = new TextField("0");

      // cell Row label
      GridPane.setHalignment(cellRowLbl, HPos.RIGHT);
      add(cellRowLbl, 0, 6);

      // cell Row field
      GridPane.setHalignment(cellRowFld, HPos.LEFT);
      add(cellRowFld, 1, 6);

      // Horizontal Alignment
      Label hAlignLbl = new Label("Horiz. Align");
      final ChoiceBox<String> hAlignFld = new ChoiceBox<>(FXCollections.observableArrayList("CENTER", "LEFT", "RIGHT"));
      hAlignFld.getSelectionModel().select("LEFT");

      // cell Row label
      GridPane.setHalignment(hAlignLbl, HPos.RIGHT);
      add(hAlignLbl, 0, 7);

      // cell Row field
      GridPane.setHalignment(hAlignFld, HPos.LEFT);
      add(hAlignFld, 1, 7);

      // Vertical Alignment
      Label vAlignLbl = new Label("Vert. Align");
      final ChoiceBox<String> vAlignFld = new ChoiceBox<>(
            FXCollections.observableArrayList("BASELINE", "BOTTOM", "CENTER", "TOP"));
      vAlignFld.getSelectionModel().select("TOP");
      // cell Row label
      GridPane.setHalignment(vAlignLbl, HPos.RIGHT);
      add(vAlignLbl, 0, 8);

      // cell Row field
      GridPane.setHalignment(vAlignFld, HPos.LEFT);
      add(vAlignFld, 1, 8);

      // Vertical Alignment
      Label cellApplyLbl = new Label("Cell Constraint");
      final Button cellApplyButton = new Button("Apply");
      cellApplyButton.setOnAction((ActionEvent event) -> {
         for (Node child : targetGridPane.getChildren()) {

            int targetColIndx = 0;
            int targetRowIndx = 0;
            try {
               targetColIndx = Integer.parseInt(cellColFld.getText());
               targetRowIndx = Integer.parseInt(cellRowFld.getText());
            } catch (NumberFormatException e) {

            }
            int col = GridPane.getColumnIndex(child);
            int row = GridPane.getRowIndex(child);
            if (col == targetColIndx && row == targetRowIndx) {
               GridPane.setHalignment(child, HPos.valueOf(hAlignFld.getSelectionModel().getSelectedItem().toString()));
               GridPane.setValignment(child, VPos.valueOf(vAlignFld.getSelectionModel().getSelectedItem().toString()));
            }
         }
      });

      // cell Row label
      GridPane.setHalignment(cellApplyLbl, HPos.RIGHT);
      add(cellApplyLbl, 0, 9);

      // cell Row field
      GridPane.setHalignment(cellApplyButton, HPos.LEFT);
      add(cellApplyButton, 1, 9);

   }
}

class MyForm extends GridPane {
   public MyForm() {

      setPadding(new Insets(5));
      setHgap(5);
      setVgap(5);

      Label fNameLbl = new Label("First Name");
      TextField fNameFld = new TextField();
      Label lNameLbl = new Label("Last Name");
      TextField lNameFld = new TextField();
      Label ageLbl = new Label("Age");
      TextField ageFld = new TextField();

      Button saveButt = new Button("Save");

      // First name label
      GridPane.setHalignment(fNameLbl, HPos.RIGHT);
      add(fNameLbl, 0, 0);

      // Last name label
      GridPane.setHalignment(lNameLbl, HPos.RIGHT);
      add(lNameLbl, 0, 1);

      // Age label
      GridPane.setHalignment(ageLbl, HPos.RIGHT);
      add(ageLbl, 0, 2);

      // First name field
      GridPane.setHalignment(fNameFld, HPos.LEFT);
      add(fNameFld, 1, 0);

      // Last name field
      GridPane.setHalignment(lNameFld, HPos.LEFT);
      add(lNameFld, 1, 1);

      // Age Field
      GridPane.setHalignment(ageFld, HPos.RIGHT);
      add(ageFld, 1, 2);

      // Save button
      GridPane.setHalignment(saveButt, HPos.RIGHT);
      add(saveButt, 1, 3);

   }
}

public class Main extends Application {

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

   @Override
   public void start(Stage primaryStage) {
      primaryStage.setTitle("");
      Group root = new Group();
      Scene scene = new Scene(root, 640, 480, Color.WHITE);

      // Left and right split pane
      SplitPane splitPane = new SplitPane();
      splitPane.prefWidthProperty().bind(scene.widthProperty());
      splitPane.prefHeightProperty().bind(scene.heightProperty());

      // Form on the right
      GridPane rightGridPane = new MyForm();

      GridPane leftGridPane = new GridPaneControlPanel(rightGridPane);

      VBox leftArea = new VBox(10);
      leftArea.getChildren().add(leftGridPane);
      HBox hbox = new HBox();
      hbox.getChildren().add(splitPane);
      root.getChildren().add(hbox);
      splitPane.getItems().addAll(leftArea, rightGridPane);

      primaryStage.setScene(scene);

      primaryStage.show();
   }

}