Question

GUI Applications with I/O ISTE-121-Homework 01 Overview This homework is a continuation of your lab 1. You need to complete lab 1, make a copy of lab 1 Orders, and rename to class OrderSystem for this homework Then make the modifications required for this homework You may not have received all the information to do this assignment by the time it is being handed out. The information from the second class of the course, and the lab will help you with this assignment. Some solutions to this are given in the lab, so do what you can until the lab day. Then make sure all your questions are answered for this homework The main class name for homework 1 is OrderSystem. When you get the GUI to look similar to the display that is close enough for this homework Part 1: GUI Layout (start with Lab 1 code) Part 1 is from lab 1: Create a GUI that contains right aligned labels for text fields as shown. Label, field and button object names should be self-documenting representations of the GUI components. Place all of the components in a GridPane, then add the GridPane to the root VBox Add buttons to control the actions that will take place on the screen. Your screer should now look similar to the screen shot below Have the "Amount owed" field not allow input Format the amount owed result to have two decimal places. See String class in the Javadocs how to format a number (String.format) (A. Student) Item Orders Calculator Item Name: Gidget Widget Number: 40000 Cost 2 Amount owed:80000.00 Calculate Save Clear Exit

You may adjust the code as you want. Thank you!

CODING HERE:

import javafx.application.Application;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;
import javafx.geometry.*;

public class OrderSystem extends Application implements EventHandler<ActionEvent>
{

// Attributes for GUI
private Stage stage; // The entire window, including title bar and borders
private Scene scene; // Interior of window
private BorderPane layout;

// Add four labels
private Label itemLabel = new Label("Item Name:");
private Label numberLabel = new Label("Number:");
private Label costLabel = new Label("Cost:");
private Label amountOwedLabel = new Label("Amount Owed:");
// add four textfields for labels
private TextField itemName = new TextField();
private TextField number = new TextField();
private TextField cost = new TextField();
private TextField amountOwed = new TextField();
// add buttons
private Button btnCalc = new Button("Calculate"); //To calculate the result
private Button btnSave = new Button("Save"); //To save the result
private Button btnClear = new Button("Clear"); //To clear the result
private Button btnExit = new Button("Exit"); //To exit the program
private Button btnLoad = new Button("Load"); //To load the data
private Button btnPrev = new Button("<Prev"); //To previous the data
private Button btnNext = new Button(">Next"); //To next the data
private Button btnCalcSave = new Button("Calculate & Save"); //To calculate then save


// Main of this GUI class
public static void main(String [] args)
{
launch(args);
  
} // end of main


public void start(Stage _stage) throws Exception
{
stage = _stage; // save stage as an attribute
stage.setTitle("Quoc Huynh Item Orders Calculator"); // set the text in the title bar
layout = new BorderPane();
  
FlowPane loTop = new FlowPane(10, 10);
  
loTop.setAlignment(Pos.CENTER);
loTop.getChildren().add(itemLabel);
loTop.getChildren().add(itemName);
loTop.getChildren().add(numberLabel);
loTop.getChildren().add(number);
loTop.getChildren().add(costLabel);
loTop.getChildren().add(cost);
loTop.getChildren().add(amountOwedLabel);
loTop.getChildren().add(amountOwed);
  
  

layout.setTop(loTop);
scene = new Scene(layout, 300, 200);
  
stage.setScene(scene);
stage.show();
  
}

public void handle(ActionEvent ae)
{
Button btn = (Button)ae.getSource();
}
}

Answer 1

import javafx.application.Application;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.*;
import javafx.stage.*;
import javafx.geometry.*;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class OrderSystem extends Application implements EventHandler<ActionEvent> {

    // Attributes for GUI
    private Stage stage; // The entire window, including title bar and borders
    private Scene scene; // Interior of window
    private VBox layout;

    // Add four labels
    private Label itemLabel = new Label("Item Name:");
    private Label numberLabel = new Label("Number:");
    private Label costLabel = new Label("Cost:");
    private Label amountOwedLabel = new Label("Amount Owed:");

    // add four TextFields for labels
    private TextField itemName = new TextField();
    private TextField number = new TextField();
    private TextField cost = new TextField();
    private TextField amountOwed = new TextField();

    // add buttons
    private Button btnCalc = new Button("Calculate"); // To calculate the result
    private Button btnSave = new Button("Save"); // To save the result
    private Button btnClear = new Button("Clear"); // To clear the result
    private Button btnExit = new Button("Exit"); // To exit the program
    private Button btnLoad = new Button("Load"); // To load the data
    private Button btnPrev = new Button("<Prev"); // To previous the data
    private Button btnNext = new Button(">Next"); // To next the data

    // ArrayList to hold items
    ArrayList<String> records = new ArrayList<String>();
    int currentRecordIndex = 0;

    final String FILE_NAME = "121Lab1.csv";

    // Main of this GUI class
    public static void main(String[] args) {
        launch(args);
    } // end of main

    private void loadRecordIndex(int index) {
        String firstLine = records.get(index);
        currentRecordIndex = index;

        String parts[] = firstLine.split(",");
        itemName.setText(parts[0]);
        number.setText(parts[1]);
        cost.setText(parts[2]);
        amountOwed.setText(String.format("%.2f", Double.parseDouble(parts[1]) * Double.parseDouble(parts[2])));
        calculateCurrentData();
    }

    private void calculateCurrentData() {
        try {
            System.out.println(Double.parseDouble(number.getText()) * Double.parseDouble(cost.getText()));
            amountOwed.setText(
                    String.format("%.2f", Double.parseDouble(number.getText()) * Double.parseDouble(cost.getText())));
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
    }

    private void saveCurrentDataInList() {
        calculateCurrentData();
        records.add(String.format("%s,%s,%s,%s", itemName.getText(), number.getText(), cost.getText(),
                amountOwed.getText()));
    }

    private void writeDataToFile() {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(FILE_NAME));

            for (String line : records) {
                writer.write(line + "\n");
            }
            writer.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public int load() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader(FILE_NAME));
            String line;
            records.clear();

            while ((line = reader.readLine()) != null) {
                if (!line.isEmpty()) {
                    records.add(line);
                }
            }
            reader.close();

            if (records.size() == 0) {
                return 0;
            }
            loadRecordIndex(0);

            return records.size();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return -1;
    }

    public void start(Stage _stage) throws Exception {
        stage = _stage; // save stage as an attribute
        stage.setTitle("Quoc Huynh Item Orders Calculator"); // set the text in the title bar

        GridPane grid = new GridPane();

        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(3);
        grid.setPadding(new Insets(5, 5, 5, 5));

        grid.add(itemLabel, 0, 0);
        GridPane.setHalignment(itemLabel, HPos.RIGHT);
        grid.add(itemName, 1, 0);

        grid.add(numberLabel, 0, 1);
        GridPane.setHalignment(numberLabel, HPos.RIGHT);
        grid.add(number, 1, 1);

        grid.add(costLabel, 0, 2);
        GridPane.setHalignment(costLabel, HPos.RIGHT);
        grid.add(cost, 1, 2);

        grid.add(amountOwedLabel, 0, 3);
        GridPane.setHalignment(amountOwedLabel, HPos.RIGHT);
        grid.add(amountOwed, 1, 3);

        amountOwed.setDisable(true);

        HBox firstRow = new HBox(10);
        firstRow.getChildren().addAll(btnCalc, btnSave, btnClear, btnExit, btnLoad);
        firstRow.setAlignment(Pos.CENTER);

        btnCalc.setTooltip(new Tooltip("Calculate amount owned for current record"));
        btnCalc.setOnAction(this);

        btnSave.setTooltip(new Tooltip("Saves and writes current record to disk"));
        btnSave.setOnAction(this);

        btnClear.setTooltip(new Tooltip("Clears all fields on GUI"));
        btnClear.setOnAction(this);

        btnExit.setTooltip(new Tooltip("Close the tool!"));
        btnExit.setOnAction(this);

        btnLoad.setTooltip(new Tooltip("Loads the data from the file"));
        btnLoad.setOnAction(this);

        HBox secondRow = new HBox(10);
        secondRow.getChildren().addAll(btnPrev, btnNext);
        secondRow.setAlignment(Pos.CENTER);

        btnPrev.setOnAction(this);
        btnNext.setOnAction(this);

        layout = new VBox(5);
        layout.getChildren().addAll(grid, firstRow, secondRow);

        scene = new Scene(layout, 500, 250);

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

    public void handle(ActionEvent ae) {
        Button btn = (Button) ae.getSource();

        if (btn.equals(btnCalc)) {
            calculateCurrentData();
        } else if (btn.equals(btnSave)) {
            saveCurrentDataInList();
            writeDataToFile();
        } else if (btn.equals(btnClear)) {
            itemName.setText(null);
            number.setText(null);
            cost.setText(null);
            amountOwed.setText(null);
        } else if (btn.equals(btnExit)) {
            System.exit(0);
        } else if (btn.equals(btnLoad)) {
            int count = load();
            if (count == -1) {
                Alert alert = new Alert(AlertType.ERROR, "Unable to read file", ButtonType.OK);
                alert.showAndWait();
            } else {
                Alert alert = new Alert(AlertType.INFORMATION, "File Read \n" + count + " records read.",
                        ButtonType.OK);
                alert.showAndWait();
            }
        } else if (btn.equals(btnPrev)) {
            if (currentRecordIndex == 0) {
                Alert alert = new Alert(AlertType.ERROR, "No Previous record present", ButtonType.OK);
                alert.showAndWait();
            } else {
                loadRecordIndex(--currentRecordIndex);
            }
        } else if (btn.equals(btnNext)) {
            if (currentRecordIndex == records.size() - 1) {
                Alert alert = new Alert(AlertType.ERROR, "No next record present", ButtonType.OK);
                alert.showAndWait();
            } else {
                loadRecordIndex(++currentRecordIndex);
            }
        }
    }
}

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