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# Code for Advanced Calculator

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    package com.trolltech.examples;

    import java.util.*;

    import com.trolltech.demos.Interpreter;
    import com.trolltech.qt.gui.*;

    @QtJambiExample(name = "Advanced Calculator")
    public class AdvancedCalculator extends QMainWindow {

        public static void main(String[] args) {
            QApplication.initialize(args);
            AdvancedCalculator calculator = new AdvancedCalculator();
            calculator.show();
            QApplication.exec();
        }

        private QLineEdit lineEdit;
        private QTextBrowser textBrowser;

        private Interpreter interpreter = new Interpreter();

        public AdvancedCalculator() {
            Vector<String> uiTypes = new Vector<String>(3);
            uiTypes.add("Simple");
            uiTypes.add("Normal");
            uiTypes.add("Dockable");

            setWindowIcon(new QIcon("classpath:com/trolltech/images/qt-logo.png"));

            String item = QInputDialog.getItem(this, tr("Ui selector"), tr("Ui configurations:"), uiTypes, 0, false);

            if (item == null || item.equals("Simple")) {
                Ui_CalculatorSimple uiSimple = new Ui_CalculatorSimple();
                uiSimple.setupUi(this);
                lineEdit = uiSimple.lineEdit;
                textBrowser = uiSimple.textBrowser;
            } else if (item.equals("Normal")) {
                Ui_CalculatorNormal uiNormal = new Ui_CalculatorNormal();
                uiNormal.setupUi(this);
                lineEdit = uiNormal.lineEdit;
                textBrowser = uiNormal.textBrowser;
            } else if (item.equals("Dockable")) {
                Ui_CalculatorDockable uiDockable = new Ui_CalculatorDockable();
                uiDockable.setupUi(this);
                lineEdit = uiDockable.lineEdit;
                textBrowser = uiDockable.textBrowser;
            }
        }

        public void on_button_equal_clicked() {
            String expression = lineEdit.text();
            String result = "";
            boolean error = false;
            try {
                result = interpreter.evaluate(interpreter.parse(expression)).toString();
            } catch (Interpreter.ParseException exception) {
                result = "Error: <font color=\"red\">" + exception.getMessage() + "</font>";
                error = true;
            }

            textBrowser.append(expression + "<b> = " + result + "</b><br>");
            if (error)
                result = expression;
            lineEdit.setText(result);
        }

        public void type(String s) {
            lineEdit.setText(lineEdit.text() + s);
        }

        public void typeAround(String s) {
            lineEdit.setText(s + "(" + lineEdit.text() + ")");
        }

        public void on_button_1_clicked() {
            type("1");
        }

        public void on_button_2_clicked() {
            type("2");
        }

        public void on_button_3_clicked() {
            type("3");
        }

        public void on_button_4_clicked() {
            type("4");
        }

        public void on_button_5_clicked() {
            type("5");
        }

        public void on_button_6_clicked() {
            type("6");
        }

        public void on_button_7_clicked() {
            type("7");
        }

        public void on_button_8_clicked() {
            type("8");
        }

        public void on_button_9_clicked() {
            type("9");
        }

        public void on_button_0_clicked() {
            type("0");
        }

        public void on_button_add_clicked() {
            type("+");
        }

        public void on_button_subtract_clicked() {
            type("-");
        }

        public void on_button_multiply_clicked() {
            type("*");
        }

        public void on_button_devide_clicked() {
            type("/");
        }

        public void on_button_comma_clicked() {
            type(".");
        }

        public void on_button_left_clicked() {
            type("(");
        }

        public void on_button_right_clicked() {
            type(")");
        }

        public void on_button_sin_clicked() {
            typeAround("sin");
        }

        public void on_button_cos_clicked() {
            typeAround("cos");
        }

        public void on_button_random_clicked() {
            type("random()");
        }

        public void on_button_functions_clicked() {
            Vector<String> functionKeys = new Vector<String>(interpreter.functions.size());
            functionKeys.addAll(interpreter.functions.keySet());

            String key = QInputDialog.getItem(this, tr("Function selector"), tr("Available functions:"), functionKeys, 0, false);
            if (key != null)
                type(key);
        }
    }