lab-05:
Working calculator
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158
lab-05/src/CalculatorPane.java
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158
lab-05/src/CalculatorPane.java
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import javafx.event.EventHandler;
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import javafx.geometry.Insets;
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import javafx.geometry.Pos;
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import javafx.scene.control.Button;
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import javafx.scene.control.TextField;
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import javafx.scene.input.MouseEvent;
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import javafx.scene.layout.*;
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import javafx.scene.paint.Paint;
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import java.util.ArrayList;
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import java.util.List;
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public class CalculatorPane extends VBox implements EventHandler<MouseEvent> {
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private Button[] btnList;
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private TextField ioField;
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private boolean subtracting;
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private int firstOperand;
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public CalculatorPane(){
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constructButtons();
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setSpacing(15);
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setPadding(new Insets(10));
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ioField = new TextField();
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ioField.setPrefColumnCount(15);
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ioField.setEditable(false);
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ioField.setText("");
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ioField.setPrefHeight(15);
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}
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private void calculateAndDisplay() {
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if (subtracting) {
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display(String.valueOf(firstOperand - Integer.parseInt(ioField.getText())));
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}
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else display(String.valueOf(firstOperand+Integer.parseInt(ioField.getText())));
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}
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private void clear() {
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this.firstOperand = 0;
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ioField.setText("");
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subtracting = false; //defualt to adding
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}
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private void add() {
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firstOperand = Integer.parseInt(ioField.getText());
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subtracting = false;
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}
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private void subtract() {
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firstOperand = Integer.parseInt(ioField.getText());
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subtracting = true;
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}
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private void display(String result) {
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ioField.setText(result);
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}
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@Override
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public void handle(MouseEvent mouseEvent) {
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int pressedBtn = 0;
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for (int i = 0; i < btnList.length; i++) {
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if (btnList[i] == mouseEvent.getSource()){
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pressedBtn = i;
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}
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}
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System.out.println(mouseEvent.getSource() + "Clicked");
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if (firstOperand == 0) {
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//if there is no op yet, append to io.
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ioField.setText(ioField.getText()+ pressedBtn);
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}
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else {
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ioField.setText(String.valueOf(pressedBtn));
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}
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}
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private void constructButtons(){
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btnList = new Button[14];
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btnList[Buttons.ZERO] = new Button("0");//Index 0
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btnList[Buttons.ONE] = new Button("1");//Index 1
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btnList[Buttons.TWO] = new Button("2");// ...
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btnList[Buttons.THREE] = new Button("3");
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btnList[Buttons.FOUR] = new Button("4");
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btnList[Buttons.FIVE] = new Button("5");
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btnList[Buttons.SIX] = new Button("6");
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btnList[Buttons.SEVEN] = new Button("7");
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btnList[Buttons.EIGHT] = new Button("8");
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btnList[Buttons.NINE] = new Button("9");
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btnList[Buttons.PLUS] = new Button("+");
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btnList[Buttons.MINUS] = new Button("-");
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btnList[Buttons.EQUAL] = new Button("=");
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btnList[Buttons.CLEAR] = new Button("C");//Index 14
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for (Button btn : btnList){
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btn.setPrefSize(50,50);
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btn.setOnMouseClicked(this);
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}
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btnList[Buttons.CLEAR].setOnMouseClicked(e-> clear());
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btnList[Buttons.PLUS].setOnMouseClicked(e -> add());
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btnList[Buttons.MINUS].setOnMouseClicked(e -> subtract());
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btnList[Buttons.EQUAL].setOnMouseClicked(e -> calculateAndDisplay());
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HBox firstRow = new HBox();
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HBox secondRow = new HBox();
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HBox thirdRow = new HBox();
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HBox fourthRow = new HBox();
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HBox fifthRow = new HBox();
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firstRow.setSpacing(20);
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firstRow.setAlignment(Pos.CENTER);
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secondRow.setSpacing(20);
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secondRow.setAlignment(Pos.CENTER);
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thirdRow.setSpacing(20);
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thirdRow.setAlignment(Pos.CENTER);
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fourthRow.setSpacing(20);
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fourthRow.setAlignment(Pos.CENTER);
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fifthRow.setSpacing(20);
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fifthRow.setAlignment(Pos.CENTER);
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firstRow.getChildren().addAll(
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btnList[Buttons.ONE], btnList[Buttons.TWO], btnList[Buttons.THREE]
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);
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secondRow.getChildren().addAll(
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btnList[Buttons.FOUR], btnList[Buttons.FIVE], btnList[Buttons.SIX]
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);
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thirdRow.getChildren().addAll(
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btnList[Buttons.SEVEN], btnList[Buttons.EIGHT], btnList[Buttons.NINE]
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);
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fourthRow.getChildren().addAll(
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btnList[Buttons.PLUS], btnList[Buttons.MINUS], btnList[Buttons.ZERO]
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);
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fifthRow.getChildren().addAll(
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btnList[Buttons.EQUAL], btnList[Buttons.CLEAR]
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);
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getChildren().addAll(ioField, firstRow, secondRow, thirdRow, fourthRow, fifthRow);
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}
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private final class Buttons {
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public final static int ZERO = 0;
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public final static int ONE = 1;
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public final static int TWO = 2;
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public final static int THREE = 3;
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public final static int FOUR = 4;
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public final static int FIVE = 5;
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public final static int SIX = 6;
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public final static int SEVEN = 7;
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public final static int EIGHT = 8;
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public final static int NINE = 9;
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public final static int PLUS = 10;
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public final static int MINUS = 11;
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public final static int EQUAL = 12;
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public final static int CLEAR = 13;
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}
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}
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@ -9,9 +9,9 @@ public class Main extends Application {
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@Override
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public void start(Stage primaryStage) throws Exception{
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Pane root = new Pane();
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primaryStage.setTitle("Hello World");
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primaryStage.setScene(new Scene(root, 300, 275));
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CalculatorPane root = new CalculatorPane();
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primaryStage.setTitle("Calculator");
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primaryStage.setScene(new Scene(root, 300, 400));
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primaryStage.show();
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}
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