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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; - } - } - } - -- -