jaroslav@142
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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.bck2brwsr.mavenhtml;
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import org.apidesign.bck2brwsr.htmlpage.api.OnClick;
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import org.apidesign.bck2brwsr.htmlpage.api.Page;
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jaroslav@198
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/** HTML5 & Java demo showing the power of
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* <a href="http://wiki.apidesign.org/wiki/AnnotationProcessor">annotation processors</a>
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* as well as other goodies.
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*
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* @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*/
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@Page(xhtml="Calculator.xhtml")
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public class App {
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private static double memory;
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private static String operation;
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@OnClick(id="clear")
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static void clear() {
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memory = 0;
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operation = null;
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Calculator.DISPLAY.setValue("0");
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}
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@OnClick(id= { "plus", "minus", "mul", "div" })
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static void applyOp(String op) {
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memory = getValue();
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operation = op;
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Calculator.DISPLAY.setValue("0");
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}
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@OnClick(id="result")
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static void computeTheValue() {
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switch (operation) {
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case "plus": setValue(memory + getValue()); break;
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case "minus": setValue(memory - getValue()); break;
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case "mul": setValue(memory * getValue()); break;
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case "div": setValue(memory / getValue()); break;
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default: throw new IllegalStateException(operation);
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}
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}
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@OnClick(id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"})
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static void addDigit(String digit) {
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digit = digit.substring(1);
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String v = Calculator.DISPLAY.getValue();
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if (getValue() == 0.0) {
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Calculator.DISPLAY.setValue(digit);
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} else {
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Calculator.DISPLAY.setValue(v + digit);
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}
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}
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private static void setValue(double v) {
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StringBuilder sb = new StringBuilder();
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sb.append(v);
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if (sb.toString().endsWith(".0")) {
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final int l = sb.length();
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sb.delete(l - 2, l);
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}
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Calculator.DISPLAY.setValue(sb.toString());
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}
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private static double getValue() {
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try {
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return Double.parseDouble(Calculator.DISPLAY.getValue());
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} catch (NumberFormatException ex) {
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Calculator.DISPLAY.setValue("err");
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return 0.0;
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}
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}
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}
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