1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ko/fx/src/main/java/org/apidesign/bck2brwsr/kofx/Knockout.java Wed Jun 26 20:11:13 2013 +0200
1.3 @@ -0,0 +1,196 @@
1.4 +/**
1.5 + * Back 2 Browser Bytecode Translator
1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details.
1.16 + *
1.17 + * You should have received a copy of the GNU General Public License
1.18 + * along with this program. Look for COPYING file in the top folder.
1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 + */
1.21 +package org.apidesign.bck2brwsr.kofx;
1.22 +
1.23 +import java.io.BufferedReader;
1.24 +import java.io.IOException;
1.25 +import java.io.InputStream;
1.26 +import java.io.InputStreamReader;
1.27 +import java.util.logging.Level;
1.28 +import java.util.logging.Logger;
1.29 +import net.java.html.js.JavaScriptBody;
1.30 +import net.java.html.json.Model;
1.31 +import netscape.javascript.JSObject;
1.32 +import org.apidesign.html.json.spi.FunctionBinding;
1.33 +import org.apidesign.html.json.spi.PropertyBinding;
1.34 +
1.35 +/** This is an implementation package - just
1.36 + * include its JAR on classpath and use official {@link Context} API
1.37 + * to access the functionality.
1.38 + * <p>
1.39 + * Provides binding between {@link Model models} and knockout.js running
1.40 + * inside a JavaFX WebView.
1.41 + *
1.42 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.43 + */
1.44 +public final class Knockout {
1.45 + private static final Logger LOG = Logger.getLogger(Knockout.class.getName());
1.46 + /** used by tests */
1.47 + static Knockout next;
1.48 + private final Object model;
1.49 +
1.50 + Knockout(Object model) {
1.51 + this.model = model == null ? this : model;
1.52 + }
1.53 +
1.54 + public Object koData() {
1.55 + return model;
1.56 + }
1.57 +
1.58 + static Object toArray(Object[] arr) {
1.59 + return InvokeJS.KObject.call("array", arr);
1.60 + }
1.61 +
1.62 + private static int cnt;
1.63 + public static <M> Knockout createBinding(Object model) {
1.64 + Object bindings = InvokeJS.create(model, ++cnt);
1.65 + return new Knockout(bindings);
1.66 + }
1.67 +
1.68 + public void valueHasMutated(String prop) {
1.69 + valueHasMutated((JSObject) model, prop);
1.70 + }
1.71 + public static void valueHasMutated(JSObject model, String prop) {
1.72 + LOG.log(Level.FINE, "property mutated: {0}", prop);
1.73 + try {
1.74 + Object koProp = model.getMember(prop);
1.75 + if (koProp instanceof JSObject) {
1.76 + ((JSObject)koProp).call("valueHasMutated");
1.77 + }
1.78 + } catch (Throwable t) {
1.79 + LOG.log(Level.WARNING, "valueHasMutated failed for " + model + " prop: " + prop, t);
1.80 + }
1.81 + }
1.82 +
1.83 + static void bind(
1.84 + Object bindings, Object model, PropertyBinding pb, boolean primitive, boolean array
1.85 + ) {
1.86 + final String prop = pb.getPropertyName();
1.87 + try {
1.88 + InvokeJS.bind(bindings, pb, prop, "getValue", pb.isReadOnly() ? null : "setValue", primitive, array);
1.89 +
1.90 + ((JSObject)bindings).setMember("ko-fx.model", model);
1.91 + LOG.log(Level.FINE, "binding defined for {0}: {1}", new Object[]{prop, ((JSObject)bindings).getMember(prop)});
1.92 + } catch (Throwable ex) {
1.93 + LOG.log(Level.WARNING, "binding failed for {0} on {1}", new Object[]{prop, bindings});
1.94 + }
1.95 + }
1.96 + static void expose(Object bindings, FunctionBinding f) {
1.97 + final String prop = f.getFunctionName();
1.98 + try {
1.99 + InvokeJS.expose(bindings, f, prop, "call");
1.100 + } catch (Throwable ex) {
1.101 + LOG.log(Level.SEVERE, "Cannot define binding for " + prop + " in model " + f, ex);
1.102 + }
1.103 + }
1.104 +
1.105 + static void applyBindings(Object bindings) {
1.106 + InvokeJS.applyBindings(bindings);
1.107 + }
1.108 +
1.109 + private static final class InvokeJS {
1.110 + static final JSObject KObject;
1.111 +
1.112 + static {
1.113 + final InputStream koScript = Knockout.class.getResourceAsStream("knockout-2.2.1.js");
1.114 + assert koScript != null : "Can't load knockout.js";
1.115 + BufferedReader r = new BufferedReader(new InputStreamReader(koScript));
1.116 + StringBuilder sb = new StringBuilder();
1.117 + for (;;) {
1.118 + try {
1.119 + String l = r.readLine();
1.120 + if (l == null) {
1.121 + break;
1.122 + }
1.123 + sb.append(l).append('\n');
1.124 + } catch (IOException ex) {
1.125 + throw new IllegalStateException(ex);
1.126 + }
1.127 + }
1.128 + exec(sb.toString());
1.129 + Object ko = exec("ko");
1.130 + assert ko != null : "Knockout library successfully defined 'ko'";
1.131 +
1.132 + Console.register();
1.133 + KObject = (JSObject) kObj();
1.134 + }
1.135 +
1.136 + @JavaScriptBody(args = { "s" }, body = "return eval(s);")
1.137 + private static native Object exec(String s);
1.138 +
1.139 + @JavaScriptBody(args = {}, body =
1.140 + " var k = {};"
1.141 + + " k.array= function() {"
1.142 + + " return Array.prototype.slice.call(arguments);"
1.143 + + " };"
1.144 + + " return k;"
1.145 + )
1.146 + private static native Object kObj();
1.147 +
1.148 + @JavaScriptBody(args = { "value", "cnt " }, body =
1.149 + " var ret = {};"
1.150 + + " ret.toString = function() { return 'KObject' + cnt + ' value: ' + value + ' props: ' + Object.keys(this); };"
1.151 + + " return ret;"
1.152 + )
1.153 + static native Object create(Object value, int cnt);
1.154 +
1.155 + @JavaScriptBody(args = { "bindings", "model", "prop", "sig" }, body =
1.156 + " bindings[prop] = function(data, ev) {"
1.157 + // + " console.log(\" callback on prop: \" + prop);"
1.158 + + " model[sig](data, ev);"
1.159 + + " };"
1.160 + )
1.161 + static native Object expose(Object bindings, Object model, String prop, String sig);
1.162 +
1.163 +
1.164 + @JavaScriptBody(args = { "bindings", "model", "prop", "getter", "setter", "primitive", "array" }, body =
1.165 + " var bnd = {"
1.166 + + " read: function() {"
1.167 + + " try {"
1.168 + + " var v = model[getter]();"
1.169 + // + " console.log(\" getter value \" + v + \" for property \" + prop);"
1.170 + // + " try { v = v.koData(); } catch (ignore) {"
1.171 + // + " console.log(\"Cannot convert to koData: \" + ignore);"
1.172 + // + " };"
1.173 + // + " console.log(\" getter ret value \" + v);"
1.174 + // + " for (var pn in v) {"
1.175 + // + " console.log(\" prop: \" + pn + \" + in + \" + v + \" = \" + v[pn]);"
1.176 + // + " if (typeof v[pn] == \"function\") console.log(\" its function value:\" + v[pn]());"
1.177 + // + " }"
1.178 + // + " console.log(\" all props printed for \" + (typeof v));"
1.179 + + " return v;"
1.180 + + " } catch (e) {"
1.181 + + " alert(\"Cannot call \" + getter + \" on \" + model + \" error: \" + e);"
1.182 + + " }"
1.183 + + " },"
1.184 + + " owner: bindings"
1.185 + // + " ,deferEvaluation: true"
1.186 + + " };"
1.187 + + " if (setter != null) {"
1.188 + + " bnd.write = function(val) {"
1.189 + + " model[setter](primitive ? new Number(val) : val);"
1.190 + + " };"
1.191 + + " };"
1.192 + + " bindings[prop] = ko.computed(bnd);"
1.193 + )
1.194 + static native void bind(Object binding, Object model, String prop, String getter, String setter, boolean primitive, boolean array);
1.195 +
1.196 + @JavaScriptBody(args = { "bindings" }, body = "ko.applyBindings(bindings);")
1.197 + private static native void applyBindings(Object bindings);
1.198 + }
1.199 +}