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+ + + ++ package org.apidesign.bck2brwsr.mavenhtml; + + import org.apidesign.bck2brwsr.htmlpage.api.OnClick; + import org.apidesign.bck2brwsr.htmlpage.api.Page; + + /** HTML5 & Java demo showing the power of annotation processors + * as well as other goodies, including type-safe association between + * an XHTML page and Java. + * + * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org> + */ + @Page(xhtml="Calculator.xhtml") + public class App { + private static double memory; + private static String operation; + + @OnClick(id="clear") + static void clear() { + memory = 0; + operation = null; + Calculator.DISPLAY.setValue("0"); + } + + @OnClick(id= { "plus", "minus", "mul", "div" }) + static void applyOp(String op) { + memory = getValue(); + operation = op; + Calculator.DISPLAY.setValue("0"); + } + + @OnClick(id="result") + static void computeTheValue() { + switch (operation) { + case "plus": setValue(memory + getValue()); break; + case "minus": setValue(memory - getValue()); break; + case "mul": setValue(memory * getValue()); break; + case "div": setValue(memory / getValue()); break; + default: throw new IllegalStateException(operation); + } + } + + @OnClick(id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"}) + static void addDigit(String digit) { + digit = digit.substring(1); + String v = Calculator.DISPLAY.getValue(); + if (getValue() == 0.0) { + Calculator.DISPLAY.setValue(digit); + } else { + Calculator.DISPLAY.setValue(v + digit); + } + } + + private static void setValue(double v) { + StringBuilder sb = new StringBuilder(); + sb.append(v); + Calculator.DISPLAY.setValue(sb.toString()); + } + + private static double getValue() { + try { + return Double.parseDouble(Calculator.DISPLAY.getValue()); + } catch (NumberFormatException ex) { + Calculator.DISPLAY.setValue("err"); + return 0.0; + } + } + } + ++ +