JavaFX で電卓を作る その3

前回の電卓の機能を改善し、負の整数を扱えるようにしました。また、ボタンを作成する部分を配列を用いて表現しました。次は小数を扱う機能を実装したいと思います。

最近はアルゴリズムの問題を解くことをやっていないので、近いうちにやりたいと思います。

package application;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
public class Calculator extends Application{

	//計算と結果の表示
	Label label = new Label();

	//数字のボタン
	Button btn[] = new Button[10];

	//演算子
	Button btnPlus = new Button("+");
	Button btnMinus = new Button("-");
	Button btnMultiplied = new Button("×");
	Button btnDivided = new Button("/");
	Button btnEqual = new Button("=");
	Button btnPlMi = new Button("±");
	Button btnPoint =  new Button("．");

	// クリアボタン
	Button btnClear = new Button("C");

	//ラベルの数字列
	String s1;
	String s2;

	//演算子
	String ope;

	//ラベルの数字列の長さ
	int lens1;
	int lens2;

	//計算結果
	double result;

	@Override
	public void start(Stage stage) throws Exception{
		stage.setTitle("MyCalculator");
		stage.setWidth(420);
		stage.setHeight(400);

		// ラベルの数字列
		s1="0";
		s2="";
		lens1 = 1;
		lens2 = 0;

		//ラベルの設定
		label.setText(s1);
		label.setFont(new Font(30));
		label.setAlignment(Pos.TOP_RIGHT);
		label.setPrefWidth(300);
		label.setPrefHeight(30);

		//演算子
		ope = "";

		//ボタンのサイズ
		double a = 80;
		double b = 60;
		int c = 20;

		// 数字のボタン
		//String[] btnText = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};
		btn[0] = new Button("0");
		btn[1] = new Button("1");
		btn[2] = new Button("2");
		btn[3] = new Button("3");
		btn[4] = new Button("4");
		btn[5] = new Button("5");
		btn[6] = new Button("6");
		btn[7] = new Button("7");
		btn[8] = new Button("8");
		btn[9] = new Button("9");
		for(int i = 0; i < 10; i++) {
			btn[i].setPrefHeight(b);
			btn[i].setPrefWidth(a);
			btn[i].setFont(new Font(20));
		}

		btnPlus.setPrefWidth(a);
		btnMinus.setPrefWidth(a);
		btnMultiplied.setPrefWidth(a);
		btnDivided.setPrefWidth(a);
		btnEqual.setPrefWidth(a);
		btnPlMi.setPrefWidth(a);
		btnPoint.setPrefWidth(a);

		btnPlus.setPrefHeight(b);
		btnMinus.setPrefHeight(b);
		btnMultiplied.setPrefHeight(b);
		btnDivided.setPrefHeight(b);
		btnEqual.setPrefHeight(b);
		btnPlMi.setPrefHeight(b);
		btnPoint.setPrefHeight(b);


		btnPlus.setFont(new Font(c));
		btnMinus.setFont(new Font(c));
		btnMultiplied.setFont(new Font(c));
		btnDivided.setFont(new Font(c));
		btnEqual.setFont(new Font(c));
		btnPlMi.setFont(new Font(c));
		btnPoint.setFont(new Font(c));

		//クリアボタン
		btnClear.setPrefWidth(240);
		btnClear.setPrefHeight(b);
		btnClear.setFont(new Font(c));

		//ボタンの配置 行列で位置を表現
		GridPane grid = new GridPane();
		GridPane.setConstraints(btn[7], 0, 0);
		GridPane.setConstraints(btn[8], 1, 0);
		GridPane.setConstraints(btn[9], 2, 0);
		GridPane.setConstraints(btn[4], 0, 1);
		GridPane.setConstraints(btn[5], 1, 1);
		GridPane.setConstraints(btn[6], 2, 1);
		GridPane.setConstraints(btn[1], 0, 2);
		GridPane.setConstraints(btn[2], 1, 2);
		GridPane.setConstraints(btn[3], 2, 2);
		GridPane.setConstraints(btn[0], 1, 3);
		GridPane.setConstraints(btnPlus, 3, 0);
		GridPane.setConstraints(btnMinus, 3, 1);
		GridPane.setConstraints(btnMultiplied, 3, 2);
		GridPane.setConstraints(btnDivided, 3, 3);
		GridPane.setConstraints(btnPlMi, 0, 3);
		GridPane.setConstraints(btnPoint, 2, 3);

		// 数字ボタンと演算子ボタンを格納
		grid.getChildren().addAll(btn[0], btn[1], btn[2], btn[3], btn[4], btn[5], btn[6], btn[7], btn[8], btn[9],
				btnPlus, btnMinus, btnMultiplied, btnDivided, btnPlMi, btnPoint);

		// クリアボタンとイコールボタンを水平に配置
		HBox hbox = new HBox();
		hbox.getChildren().addAll(btnClear, btnEqual);

		//ボタンとラベルを垂直に配置する
		VBox root = new VBox();
		root.getChildren().addAll(label, grid,hbox);

		// 数字ボタンの機能
		for(int i = 0; i < 10; i++) {
			btn[i].setOnAction(event -> setLabelTest());
		}

		// 演算子ボタンの機能
		btnPlus.setOnAction(event -> setLabelTest());
		btnMinus.setOnAction(event -> setLabelTest());
		btnMultiplied.setOnAction(event -> setLabelTest());
		btnDivided.setOnAction(event -> setLabelTest());
		btnPlMi.setOnAction(event -> setLabelTest());
		btnClear.setOnAction(event -> setLabelTest());

		// イコールボタンの機能
		btnEqual.setOnAction(event -> calc());

		stage.setScene(new Scene(root));
		stage.show();
	}

	void setLabelTest() {
		//表示されている数字列が0だけの場合、1-9で上書きする。
		if(s1.equals("0")) {
			if(btn[1].isArmed()) {s1 = "1";}
			if(btn[2].isArmed()) {s1 = "2";}
			if(btn[3].isArmed()) {s1 = "3";}
			if(btn[4].isArmed()) {s1 = "4";}
			if(btn[5].isArmed()) {s1 = "5";}
			if(btn[6].isArmed()) {s1 = "6";}
			if(btn[7].isArmed()) {s1 = "7";}
			if(btn[8].isArmed()) {s1 = "8";}
			if(btn[9].isArmed()) {s1 = "9";}
		}else if(s1.matches("^[0-9, -]+$") && ope == ""){
			if(btn[0].isArmed()) {s1 += "0";}
			if(btn[1].isArmed()) {s1 += "1";}
			if(btn[2].isArmed()) {s1 += "2";}
			if(btn[3].isArmed()) {s1 += "3";}
			if(btn[4].isArmed()) {s1 += "4";}
			if(btn[5].isArmed()) {s1 += "5";}
			if(btn[6].isArmed()) {s1 += "6";}
			if(btn[7].isArmed()) {s1 += "7";}
			if(btn[8].isArmed()) {s1 += "8";}
			if(btn[9].isArmed()) {s1 += "9";}
			if(btnPlMi.isArmed()) {
				if(s1.substring(0,1).matches("-")) {
					s1 = s1.substring(1, s1.length());
				}else {
					s1 = "-" + s1;
				}
			}
		}
		if(ope == "") {
			if(btnPlus.isArmed()) {ope = "+";}
			if(btnMinus.isArmed()) {ope = "-";}
			if(btnMultiplied.isArmed()) {ope = "×";}
			if(btnDivided.isArmed()) {ope = "/";}
		}

		if(!ope.equals("")) {
			if(s2.equals("0")) {
				if(btn[1].isArmed()) {s2 = "1";}
				if(btn[2].isArmed()) {s2 = "2";}
				if(btn[3].isArmed()) {s2 = "3";}
				if(btn[4].isArmed()) {s2 = "4";}
				if(btn[5].isArmed()) {s2 = "5";}
				if(btn[6].isArmed()) {s2 = "6";}
				if(btn[7].isArmed()) {s2 = "7";}
				if(btn[8].isArmed()) {s2 = "8";}
				if(btn[9].isArmed()) {s2 = "9";}
			}else {
				if(btn[0].isArmed()) {s2 += "0";}
				if(btn[1].isArmed()) {s2 += "1";}
				if(btn[2].isArmed()) {s2 += "2";}
				if(btn[3].isArmed()) {s2 += "3";}
				if(btn[4].isArmed()) {s2 += "4";}
				if(btn[5].isArmed()) {s2 += "5";}
				if(btn[6].isArmed()) {s2 += "6";}
				if(btn[7].isArmed()) {s2 += "7";}
				if(btn[8].isArmed()) {s2 += "8";}
				if(btn[9].isArmed()) {s2 += "9";}
			}
		}

		if(!ope.equals("") && btnPlMi.isArmed() && !(s2.equals("0")) && !(s2.equals(""))) {
			System.out.println("a1");
			if(s2.matches("^[0-9]+$")) {
				s2 = "(" + "-" + s2 + ")";
			}else {
				s2 = s2.substring(2, s2.length() - 1);
			}
		}

		if(btnClear.isArmed()) {
			s1 = "0";
			s2 = "";
			ope = "";
		}
		label.setText(s1+ope+s2);
	}

	//計算機能 s1とs2の演算を行う
	void calc() {
		if(!(s2.matches("")) && !(ope.matches(""))) {
			if(!s2.matches("^[0-9]+$")) {
				s2 = s2.substring(1, s2.length() - 1);
			}
			if(ope.equals("+") && (s2.matches("^[0-9, -]+$"))) {
				result = Double.valueOf(s1) +  Double.valueOf(s2);
				label.setText(String.valueOf(result));
			}else if(ope.equals("-") && (s2.matches("^[0-9, -]+$"))){
				result = Double.valueOf(s1) -  Double.valueOf(s2);
				label.setText(String.valueOf(result));
			}else if(ope.equals("×") && (s2.matches("^[0-9, -]+$"))){
				result = Double.valueOf(s1) *  Double.valueOf(s2);
				label.setText(String.valueOf(result));
			}else if(ope.equals("/") && (s2.matches("^[0-9, -]+$"))){
				result = Double.valueOf(s1) /  Double.valueOf(s2);
				label.setText(String.valueOf(result));
			}
		}
	}

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