javaquery/demo-calculator-dynamic/src/main/java/org/apidesign/bck2brwsr/demo/calc/Calc.java
2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.bck2brwsr.demo.calc;
20 import java.util.List;
21 import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;
22 import org.apidesign.bck2brwsr.htmlpage.api.On;
23 import static org.apidesign.bck2brwsr.htmlpage.api.OnEvent.*;
24 import org.apidesign.bck2brwsr.htmlpage.api.OnFunction;
25 import org.apidesign.bck2brwsr.htmlpage.api.Page;
26 import org.apidesign.bck2brwsr.htmlpage.api.Property;
28 /** HTML5 & Java demo showing the power of
29 * <a href="http://wiki.apidesign.org/wiki/AnnotationProcessor">annotation processors</a>
30 * as well as other goodies.
32 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
34 @Page(xhtml="Calculator.xhtml", properties = {
35 @Property(name = "memory", type = double.class),
36 @Property(name = "display", type = double.class),
37 @Property(name = "operation", type = String.class),
38 @Property(name = "hover", type = boolean.class),
39 @Property(name = "history", type = HistoryImpl.class, array = true)
43 new Calculator().applyBindings().setOperation("plus");
46 @On(event = CLICK, id="clear")
47 static void clear(Calculator c) {
53 @On(event = CLICK, id= { "plus", "minus", "mul", "div" })
54 static void applyOp(Calculator c, String id) {
55 c.setMemory(c.getDisplay());
60 @On(event = MOUSE_OVER, id= { "result" })
61 static void attemptingIn(Calculator c) {
64 @On(event = MOUSE_OUT, id= { "result" })
65 static void attemptingOut(Calculator c) {
69 @On(event = CLICK, id="result")
70 static void computeTheValue(Calculator c) {
71 final double newValue = compute(
76 c.setDisplay(newValue);
77 if (!containsValue(c.getHistory(), newValue)) {
78 History h = new History();
80 h.setOperation(c.getOperation());
81 c.getHistory().add(h);
87 static void recoverMemory(Calculator c, History data) {
88 c.setDisplay(data.getValue());
92 static void removeMemory(Calculator c, History data) {
93 c.getHistory().remove(data);
96 private static double compute(String op, double memory, double display) {
98 case "plus": return memory + display;
99 case "minus": return memory - display;
100 case "mul": return memory * display;
101 case "div": return memory / display;
102 default: throw new IllegalStateException(op);
106 @On(event = CLICK, id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"})
107 static void addDigit(String id, Calculator c) {
108 id = id.substring(1);
110 double v = c.getDisplay();
112 c.setDisplay(Integer.parseInt(id));
114 String txt = Double.toString(v);
115 if (txt.endsWith(".0")) {
116 txt = txt.substring(0, txt.length() - 2);
119 c.setDisplay(Double.parseDouble(txt));
124 public static String displayPreview(
125 double display, boolean hover, double memory, String operation
128 return "Type numbers and perform simple operations! Press '=' to get result.";
130 return "Attempt to compute " + memory + " " + operation + " " + display + " = " + compute(operation, memory, display);
134 static boolean emptyHistory(List<?> history) {
135 return history.isEmpty();
138 private static boolean containsValue(List<History> arr, final double newValue) {
139 for (History history : arr) {
140 if (history.getValue() == newValue) {