Question

I mainly need help with the “Mouse Events” & “Command Buttons” sections

Sqrt xA2 Cir CircleButton Clas:s The graphic circular buttons are created by drawing a filled Circle on a StackPane. So, the pictured GUI uses 9 different StackPanes tor displaying the 9 qraphic buttons. Of course, these CircleButton objects can then be placed on a single GridPane lo achieve the 3x3 layoul (see SimpleCalc class below). Creale a class narned CircleBullon thal exlends the StackPane class. The class should have a Label property and a Circle property. By default the background of the circle should be white and the text black. The no-arg constructor sets the colors to their defaults and the text to the empty string ".A second constructor should have a String parameter to initialize the Label property. Set the preferred size of the CircleButton pane to 100 but the radius of the circle to 90 pixels. Put this class in a separate file CircleButton -IblValue: Label -circle Circle +CircleButton() +CircleButton( val: String)Create a button with val as the numeric label and a white background. +setColor Paint color): voidSet the background/fill color of the CircleButton. getColor): Paint Displays button numeric value Circle o t that is dis Create a button with no displayed value and a white background. Get the current fill color of the CircleButton. etValue():Stri Get the valuec y displayed on the CircleButton. SimpleCalc Class (extends Application)

Answer 1

SimpleCalc.java

import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class SimpleCalc extends Application{
      private TextField txt;
  
      @Override
    public void start(Stage primaryStage) throws Exception {
        BorderPane borderPane = new BorderPane();
      
      
        borderPane.setTop(txtField());
        borderPane.setCenter(gridPane());
        borderPane.setBottom(hBox());
      
        Scene scene = new Scene(borderPane);
      
        primaryStage.setScene(scene);
        primaryStage.show();
    }
     
    private TextField txtField() {
      
       txt = new TextField();
       txt.setEditable(false);
       return txt;
     
    }
  
    public void toLaunch() {
        this.launch();
    }
  
    private GridPane gridPane() {
        GridPane gridPane = new GridPane();
      
        int counter = 1;
        for(int row =0; row < 3; row++) {
            for(int col = 0; col < 3; col++) {
                CircleButton circleButton = new CircleButton(counter + "");
                counter++;
              
              
              
                circleButton.setOnMousePressed(new EventHandler() {
                    @Override
                    public void handle(Event event) {
                        circleButton.setColor(Color.RED);
                        txt.appendText(circleButton.getValue());
                    }
                });
              
                 circleButton.setOnMouseReleased(new EventHandler() {
                    @Override
                    public void handle(Event event) {
                        circleButton.setColor(Color.WHITE);
                   
                    }
                });
              
                gridPane.add(circleButton, col, row);
            }
        }
      
        return gridPane;
    }
  
   public HBox hBox() {
    HBox hbox = new HBox();
     Button xsquared = new Button("x^2");
     Button sqrt = new Button("Sqrt");
     Button clear = new Button("Clear");

  
    clear.setOnAction(new EventHandler() {
        @Override
        public void handle(Event event) {
        txt.clear();
    }
    });
  
    sqrt.setOnAction(new EventHandler() {
        @Override
        public void handle(Event event) {
        txt.setText(String.valueOf(Math.sqrt(Double.parseDouble(txt.getText()))));
    }
    });
  
    xsquared.setOnAction(new EventHandler() {
        @Override
        public void handle(Event event) {
            txt.setText(String.valueOf(Math.pow(Double.parseDouble(txt.getText()),2.0)));
      
    }
    });
     hbox.getChildren().add(xsquared);
     hbox.getChildren().add(sqrt);
     hbox.getChildren().add(clear);
    return hbox;
    }

}

CircleButton.java

package calculator;

import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Circle;

public class CircleButton extends StackPane{
  
    private Label lblValue;
    private Circle circle;
  
    public CircleButton() {
        circle = new Circle();
        lblValue = new Label("");
      
        circle.setRadius(90);
        circle.setFill(Color.WHITE);
      
        this.setPrefSize(100, 100);
      
        this.getChildren().add(circle);
        this.getChildren().add(lblValue);
    }
  
    public CircleButton(String val) {
        circle = new Circle();
        lblValue = new Label(val);
      
        circle.setRadius(90);
        circle.setFill(Color.WHITE);
      
        this.setPrefSize(100, 100);
      
        this.getChildren().add(circle);
        this.getChildren().add(lblValue);
    }
  
    public void setColor(Paint color) {
        circle.setFill(color);
    }
  
    public Paint getColor() {
        return circle.getFill();
    }
  
    public String getValue() {
        return lblValue.getText();
    }

}