package Computing;

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;
import javafx.stage.Window;

public class Computing extends Application {

Stage stage;

@Override
public void start(Stage primaryStage) throws Exception {
    stage = primaryStage;
    primaryStage.setTitle("Computing Quiz");

    GridPane gridPane = createComputingQuizPane();
    // ui controls to gridpane
    addUIControls(gridPane);
    // scene
    Scene scene = new Scene(gridPane, 800, 500);
    // primary stage scene set
    stage.setScene(scene);
    stage.show();
}


public GridPane createComputingQuizPane() {
    // Instantiate a new Grid Pane
    GridPane gridPane = new GridPane();
    gridPane.setAlignment(Pos.CENTER);
    gridPane.setPadding(new Insets(40, 40, 40, 40));
    gridPane.setHgap(10);
    gridPane.setVgap(10);
    return gridPane;
}

public void addUIControls(GridPane gridPane) {
    // HEADER
    Label headerLabel = new Label("Welcome to a Computing Quiz!");
    headerLabel.setFont(Font.font("Arial", FontWeight.BOLD, 24));
    gridPane.add(headerLabel, 0,0,2,1);
    GridPane.setHalignment(headerLabel, HPos.CENTER);
    GridPane.setMargin(headerLabel, new Insets(20, 0,20,0));

    // LOGIN BUTTON
    Button loginButton = new Button("Login");
    loginButton.setPrefHeight(50);
    loginButton.setDefaultButton(true);
    loginButton.setPrefWidth(125);
    gridPane.add(loginButton, 0, 4, 2, 1);
    GridPane.setHalignment(loginButton, HPos.CENTER);
    GridPane.setMargin(loginButton, new Insets(20, 0,20,0));


    // REGISTER BUTTON
    Button registerButton = new Button ("Register");
    registerButton.setPrefHeight(50);
    registerButton.setDefaultButton(true);
    registerButton.setPrefWidth(125);
    gridPane.add(registerButton,0,5,2,1);
    GridPane.setHalignment(registerButton,HPos.CENTER);
    GridPane.setMargin(registerButton, new Insets(20,0,20,0));
    registerButton.setOnAction(e-> buttonClick());



}

public void buttonClick(){
    Register nc = new Register(stage);
}
public static void main(String[] args) {
    launch(args);    }
}

package Computing;

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;
import javafx.stage.Window;

public class Register {
Stage stage;
public Register (Stage s){
    stage = s;
}

public void start(Stage primaryStage){
    primaryStage.setTitle("Registration");

    GridPane gridPane = createRegisterPane();
    addUIControls(gridPane);
    Scene scene = new Scene(gridPane, 800, 500);
    primaryStage.setScene(scene);

    primaryStage.show();
}


private GridPane createRegisterPane() {
    GridPane gridPane = new GridPane();

    gridPane.setAlignment(Pos.CENTER);

    gridPane.setPadding(new Insets(40, 40, 40, 40));

    gridPane.setHgap(10);

    gridPane.setVgap(10);


    return gridPane;
}

private void addUIControls(GridPane gridPane) {
    // Add Header
    Label headerLabel = new Label("Registration Form");
    headerLabel.setFont(Font.font("Arial", FontWeight.BOLD, 24));
    gridPane.add(headerLabel, 0,0,2,1);
    GridPane.setHalignment(headerLabel, HPos.CENTER);
    GridPane.setMargin(headerLabel, new Insets(20, 0,20,0));

    // FULL NAME
    Label nameLabel = new Label("Full Name : ");
    gridPane.add(nameLabel, 0,1);

    // FULL NAME TEXT
    TextField nameField = new TextField();
    nameField.setPrefHeight(40);
    gridPane.add(nameField, 1,1);


    // USERNAME
    Label emailLabel = new Label("Username : ");
    gridPane.add(emailLabel, 0, 2);

    // EMAIL TEXT
    TextField emailField = new TextField();
    emailField.setPrefHeight(40);
    gridPane.add(emailField, 1, 2);

    // PASSWORD
    Label passwordLabel = new Label("Password : ");
    gridPane.add(passwordLabel, 0, 3);

    // PASSWORD TEXT
    PasswordField passwordField = new PasswordField();
    passwordField.setPrefHeight(40);
    gridPane.add(passwordField, 1, 3);

    // SUBMIT BUTTON
    Button submitButton = new Button("Submit");
    submitButton.setPrefHeight(40);
    submitButton.setDefaultButton(true);
    submitButton.setPrefWidth(100);
    gridPane.add(submitButton, 0, 4, 2, 1);
    GridPane.setHalignment(submitButton, HPos.CENTER);
    GridPane.setMargin(submitButton, new Insets(20, 0,20,0));

    submitButton.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            if(nameField.getText().isEmpty()) {
                showAlert(Alert.AlertType.ERROR,
gridPane.getScene().getWindow(), "Error", "Please enter your name.");
                return;
            }
            if(emailField.getText().isEmpty()) {
                showAlert(Alert.AlertType.ERROR,
gridPane.getScene().getWindow(), "Error", "Please enter a Username");
                return;
            }
            if(passwordField.getText().isEmpty()) {
                showAlert(Alert.AlertType.ERROR,
gridPane.getScene().getWindow(), "Error!", "Please enter a password");
                return;
            }

            showAlert(Alert.AlertType.CONFIRMATION,
gridPane.getScene().getWindow(), "Registration Successful!", "Welcome " +
nameField.getText());
        }
    });
}

private void showAlert(Alert.AlertType alertType, Window owner, String
title, String message) {
    Alert alert = new Alert(alertType);
    alert.setTitle(title);
    alert.setHeaderText(null);
    alert.setContentText(message);
    alert.initOwner(owner);
    alert.show();
}

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