jaroslav@142: /**
jaroslav@142:  * Back 2 Browser Bytecode Translator
jaroslav@142:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@142:  *
jaroslav@142:  * This program is free software: you can redistribute it and/or modify
jaroslav@142:  * it under the terms of the GNU General Public License as published by
jaroslav@142:  * the Free Software Foundation, version 2 of the License.
jaroslav@142:  *
jaroslav@142:  * This program is distributed in the hope that it will be useful,
jaroslav@142:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@142:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@142:  * GNU General Public License for more details.
jaroslav@142:  *
jaroslav@142:  * You should have received a copy of the GNU General Public License
jaroslav@142:  * along with this program. Look for COPYING file in the top folder.
jaroslav@142:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@142:  */
jaroslav@141: package org.apidesign.bck2brwsr.mavenhtml;
jaroslav@141: 
jaroslav@141: import org.apidesign.bck2brwsr.htmlpage.api.OnClick;
jaroslav@141: import org.apidesign.bck2brwsr.htmlpage.api.Page;
jaroslav@141: 
jaroslav@198: /** HTML5 & Java demo showing the power of 
jaroslav@198:  * <a href="http://wiki.apidesign.org/wiki/AnnotationProcessor">annotation processors</a>
jaroslav@198:  * as well as other goodies.
jaroslav@198:  * 
jaroslav@198:  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@198:  */
jaroslav@141: @Page(xhtml="Calculator.xhtml")
jaroslav@141: public class App {
jtulach@197:     private static double memory;
jtulach@197:     private static String operation;
jaroslav@141:     
jaroslav@141:     @OnClick(id="clear")
jaroslav@141:     static void clear() {
jtulach@197:         memory = 0;
jtulach@197:         operation = null;
jtulach@197:         Calculator.DISPLAY.setValue("0");
jtulach@197:     }
jtulach@197:     
jtulach@197:     @OnClick(id= { "plus", "minus", "mul", "div" })
jtulach@197:     static void applyOp(String op) {
jtulach@197:         memory = getValue();
jtulach@197:         operation = op;
jtulach@197:         Calculator.DISPLAY.setValue("0");
jtulach@197:     }
jtulach@197:     
jtulach@197:     @OnClick(id="result")
jtulach@197:     static void computeTheValue() {
jtulach@197:         switch (operation) {
jtulach@197:             case "plus": setValue(memory + getValue()); break;
jtulach@197:             case "minus": setValue(memory - getValue()); break;
jtulach@197:             case "mul": setValue(memory * getValue()); break;
jtulach@197:             case "div": setValue(memory / getValue()); break;
jtulach@197:             default: throw new IllegalStateException(operation);
jtulach@197:         }
jtulach@197:     }
jtulach@197:     
jtulach@197:     @OnClick(id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"}) 
jtulach@197:     static void addDigit(String digit) {
jtulach@197:         digit = digit.substring(1);
jtulach@197:         String v = Calculator.DISPLAY.getValue();
jtulach@197:         if (getValue() == 0.0) {
jtulach@197:             Calculator.DISPLAY.setValue(digit);
jtulach@197:         } else {
jtulach@197:             Calculator.DISPLAY.setValue(v + digit);
jtulach@197:         }
jaroslav@141:     }
jaroslav@141:     
jaroslav@141:     private static void setValue(double v) {
jaroslav@141:         StringBuilder sb = new StringBuilder();
jaroslav@141:         sb.append(v);
jaroslav@296:         if (sb.toString().endsWith(".0")) {
jaroslav@296:             final int l = sb.length();
jaroslav@296:             sb.delete(l - 2, l);
jaroslav@296:         }
jaroslav@141:         Calculator.DISPLAY.setValue(sb.toString());
jaroslav@141:     }
jtulach@197: 
jaroslav@141:     private static double getValue() {
jtulach@197:         try {
jtulach@197:             return Double.parseDouble(Calculator.DISPLAY.getValue());
jtulach@197:         } catch (NumberFormatException ex) {
jtulach@197:             Calculator.DISPLAY.setValue("err");
jtulach@197:             return 0.0;
jaroslav@141:         }
jaroslav@141:     }
jaroslav@141: }