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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.demo.calc.staticcompilation;
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import java.util.List;
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import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;
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import org.apidesign.bck2brwsr.htmlpage.api.On;
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import static org.apidesign.bck2brwsr.htmlpage.api.OnEvent.*;
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import org.apidesign.bck2brwsr.htmlpage.api.OnFunction;
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import org.apidesign.bck2brwsr.htmlpage.api.Page;
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import org.apidesign.bck2brwsr.htmlpage.api.Property;
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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", properties = {
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@Property(name = "memory", type = double.class),
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@Property(name = "display", type = double.class),
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@Property(name = "operation", type = String.class),
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@Property(name = "hover", type = boolean.class),
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@Property(name = "history", type = double.class, array = true)
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})
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public class Calc {
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public static void main(String... args) throws Exception {
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new Calculator().applyBindings().setOperation("plus");
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}
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@On(event = CLICK, id="clear")
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static void clear(Calculator c) {
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c.setMemory(0);
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c.setOperation(null);
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c.setDisplay(0);
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}
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@On(event = CLICK, id= { "plus", "minus", "mul", "div" })
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static void applyOp(Calculator c, String id) {
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c.setMemory(c.getDisplay());
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c.setOperation(id);
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c.setDisplay(0);
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}
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@On(event = MOUSE_OVER, id= { "result" })
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static void attemptingIn(Calculator c) {
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c.setHover(true);
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}
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@On(event = MOUSE_OUT, id= { "result" })
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static void attemptingOut(Calculator c) {
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c.setHover(false);
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}
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@On(event = CLICK, id="result")
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static void computeTheValue(Calculator c) {
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final double newValue = compute(
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c.getOperation(),
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c.getMemory(),
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c.getDisplay()
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);
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c.setDisplay(newValue);
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if (!c.getHistory().contains(newValue)) {
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c.getHistory().add(newValue);
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}
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c.setMemory(0);
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}
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@OnFunction
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static void recoverMemory(Calculator c, double data) {
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c.setDisplay(data);
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}
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@OnFunction
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static void removeMemory(Calculator c, double data) {
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c.getHistory().remove(data);
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}
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private static double compute(String op, double memory, double display) {
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switch (op) {
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case "plus": return memory + display;
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case "minus": return memory - display;
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case "mul": return memory * display;
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case "div": return memory / display;
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default: throw new IllegalStateException(op);
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}
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}
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@On(event = CLICK, id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"})
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static void addDigit(String id, Calculator c) {
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id = id.substring(1);
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double v = c.getDisplay();
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if (v == 0.0) {
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c.setDisplay(Integer.parseInt(id));
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} else {
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String txt = Double.toString(v);
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if (txt.endsWith(".0")) {
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txt = txt.substring(0, txt.length() - 2);
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}
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txt = txt + id;
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c.setDisplay(Double.parseDouble(txt));
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}
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}
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@ComputedProperty
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public static String displayPreview(
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double display, boolean hover, double memory, String operation
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) {
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if (!hover) {
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return "Type numbers and perform simple operations! Press '=' to get result.";
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}
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return "Attempt to compute " + memory + " " + operation + " " + display + " = " + compute(operation, memory, display);
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}
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@ComputedProperty
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static boolean emptyHistory(List<?> history) {
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return history.isEmpty();
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}
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}
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