JavaFX で電卓を作る その4

続き

yamakasa3.hatenablog.com

JavaFXで電卓を作る

随分前に投げ出していたJavaFXの電卓アプリを作っていきます。

前回までの電卓では、整数も「3 × 6 = 18.0」のように、小数点が含まれていましたが、今回はそれを改良しました。

次回は小数点の入力できるようにします。

久しぶりにコードを見たら酷いですね・・・。

コード

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(""))) {
            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);
                if(result == (int)result) {
                    label.setText(String.valueOf((int)result));
                }else {
                    label.setText(String.valueOf(result));
                }
            }else if(ope.equals("-") && (s2.matches("^[0-9, -]+$"))){
                result = Double.valueOf(s1) -  Double.valueOf(s2);
                if(result == (int)result) {
                    label.setText(String.valueOf((int)result));
                }else {
                    label.setText(String.valueOf(result));
                }
            }else if(ope.equals("×") && (s2.matches("^[0-9, -]+$"))){
                result = Double.valueOf(s1) *  Double.valueOf(s2);
                if(result == (int)result) {
                    label.setText(String.valueOf((int)result));
                }else {
                    label.setText(String.valueOf(result));
                }
            }else if(ope.equals("/") && (s2.matches("^[0-9, -]+$"))){
                result = Double.valueOf(s1) /  Double.valueOf(s2);
                if(result == (int)result) {
                    label.setText(String.valueOf((int)result));
                }else {
                    label.setText(String.valueOf(result));
                }
            }
        }
    }

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