javaquery/demo-calculator/src/main/java/org/apidesign/bck2brwsr/demo/calc/staticcompilation/Calc.java
2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012-2015 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.staticcompilation;
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 = double.class, array = true)
42 public static void main(String... args) throws Exception {
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 (!c.getHistory().contains(newValue)) {
78 c.getHistory().add(newValue);
84 static void recoverMemory(Calculator c, double data) {
89 static void removeMemory(Calculator c, double data) {
90 c.getHistory().remove(data);
93 private static double compute(String op, double memory, double display) {
95 case "plus": return memory + display;
96 case "minus": return memory - display;
97 case "mul": return memory * display;
98 case "div": return memory / display;
99 default: throw new IllegalStateException(op);
103 @On(event = CLICK, id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"})
104 static void addDigit(String id, Calculator c) {
105 id = id.substring(1);
107 double v = c.getDisplay();
109 c.setDisplay(Integer.parseInt(id));
111 String txt = Double.toString(v);
112 if (txt.endsWith(".0")) {
113 txt = txt.substring(0, txt.length() - 2);
116 c.setDisplay(Double.parseDouble(txt));
121 public static String displayPreview(
122 double display, boolean hover, double memory, String operation
125 return "Type numbers and perform simple operations! Press '=' to get result.";
127 return "Attempt to compute " + memory + " " + operation + " " + display + " = " + compute(operation, memory, display);
131 static boolean emptyHistory(List<?> history) {
132 return history.isEmpty();