jaroslav@492: /**
jaroslav@492:  * Back 2 Browser Bytecode Translator
jaroslav@492:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@492:  *
jaroslav@492:  * This program is free software: you can redistribute it and/or modify
jaroslav@492:  * it under the terms of the GNU General Public License as published by
jaroslav@492:  * the Free Software Foundation, version 2 of the License.
jaroslav@492:  *
jaroslav@492:  * This program is distributed in the hope that it will be useful,
jaroslav@492:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@492:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@492:  * GNU General Public License for more details.
jaroslav@492:  *
jaroslav@492:  * You should have received a copy of the GNU General Public License
jaroslav@492:  * along with this program. Look for COPYING file in the top folder.
jaroslav@492:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@492:  */
jaroslav@492: package org.apidesign.bck2brwsr.htmlpage;
jaroslav@492: 
jaroslav@530: import java.lang.reflect.Method;
jaroslav@887: import java.util.List;
jaroslav@492: import org.apidesign.bck2brwsr.core.ExtraJavaScript;
jaroslav@492: import org.apidesign.bck2brwsr.core.JavaScriptBody;
jaroslav@492: 
jaroslav@492: /** Provides binding between models and 
jaroslav@492:  *
jaroslav@492:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@492:  */
jaroslav@505: @ExtraJavaScript(resource = "/org/apidesign/bck2brwsr/htmlpage/knockout-2.2.1.js")
jaroslav@499: public class Knockout {
jaroslav@499:     /** used by tests */
jaroslav@499:     static Knockout next;
jaroslav@909:     private final Object model;
jaroslav@879: 
jaroslav@909:     Knockout(Object model) {
jaroslav@909:         this.model = model == null ? this : model;
jaroslav@492:     }
jaroslav@492:     
jaroslav@496:     public static <M> Knockout applyBindings(
jaroslav@909:         Object model, String[] propsGettersAndSetters,
jaroslav@909:         String[] methodsAndSignatures
jaroslav@909:     ) {
jaroslav@909:         applyImpl(propsGettersAndSetters, model.getClass(), model, model, methodsAndSignatures);
jaroslav@909:         return new Knockout(model);
jaroslav@909:     }
jaroslav@909:     public static <M> Knockout applyBindings(
jaroslav@879:         Class<M> modelClass, M model, String[] propsGettersAndSetters,
jaroslav@879:         String[] methodsAndSignatures
jaroslav@492:     ) {
jaroslav@499:         Knockout bindings = next;
jaroslav@499:         next = null;
jaroslav@499:         if (bindings == null) {
jaroslav@909:             bindings = new Knockout(null);
jaroslav@499:         }
jaroslav@909:         applyImpl(propsGettersAndSetters, modelClass, bindings, model, methodsAndSignatures);
jaroslav@492:         applyBindings(bindings);
jaroslav@496:         return bindings;
jaroslav@496:     }
jaroslav@496: 
jaroslav@909:     public void valueHasMutated(String prop) {
jaroslav@909:         valueHasMutated(model, prop);
jaroslav@909:     }
jaroslav@909:     @JavaScriptBody(args = { "self", "prop" }, body =
jaroslav@1018:         "var p = self[prop]; if (p) p.valueHasMutated();"
jaroslav@496:     )
jaroslav@1018:     public static void valueHasMutated(Object self, String prop) {
jaroslav@492:     }
jaroslav@492:     
jaroslav@530: 
jaroslav@530:     @JavaScriptBody(args = { "id", "ev" }, body = "ko.utils.triggerEvent(window.document.getElementById(id), ev.substring(2));")
jaroslav@530:     public static void triggerEvent(String id, String ev) {
jaroslav@530:     }
jaroslav@530:     
jaroslav@887:     @JavaScriptBody(args = { "bindings", "model", "prop", "getter", "setter", "primitive", "array" }, body =
jaroslav@492:           "var bnd = {\n"
lubomir@869:         + "  'read': function() {\n"
jaroslav@492:         + "    var v = model[getter]();\n"
jaroslav@887:         + "    if (array) v = v.koArray();\n"
jaroslav@492:         + "    return v;\n"
jaroslav@492:         + "  },\n"
lubomir@869:         + "  'owner': bindings\n"
jaroslav@492:         + "};\n"
jaroslav@492:         + "if (setter != null) {\n"
lubomir@869:         + "  bnd['write'] = function(val) {\n"
jaroslav@530:         + "    model[setter](primitive ? new Number(val) : val);\n"
jaroslav@492:         + "  };\n"
jaroslav@492:         + "}\n"
lubomir@869:         + "bindings[prop] = ko['computed'](bnd);"
jaroslav@492:     )
jaroslav@1018:     static void bind(
jaroslav@887:         Object bindings, Object model, String prop, String getter, String setter, boolean primitive, boolean array
jaroslav@492:     ) {
jaroslav@492:     }
jaroslav@879: 
jaroslav@879:     @JavaScriptBody(args = { "bindings", "model", "prop", "sig" }, body = 
jaroslav@879:         "bindings[prop] = function(data, ev) { model[sig](data, ev); };"
jaroslav@879:     )
jaroslav@1018:     static void expose(
jaroslav@879:         Object bindings, Object model, String prop, String sig
jaroslav@879:     ) {
jaroslav@879:     }
jaroslav@492:     
jaroslav@492:     @JavaScriptBody(args = { "bindings" }, body = "ko.applyBindings(bindings);")
jaroslav@1018:     static void applyBindings(Object bindings) {}
jaroslav@909:     
jaroslav@909:     private static void applyImpl(
jaroslav@909:         String[] propsGettersAndSetters,
jaroslav@909:         Class<?> modelClass,
jaroslav@909:         Object bindings,
jaroslav@909:         Object model,
jaroslav@909:         String[] methodsAndSignatures
jaroslav@909:     ) throws IllegalStateException, SecurityException {
jaroslav@909:         for (int i = 0; i < propsGettersAndSetters.length; i += 4) {
jaroslav@909:             try {
jaroslav@909:                 Method getter = modelClass.getMethod(propsGettersAndSetters[i + 3]);
jaroslav@909:                 bind(bindings, model, propsGettersAndSetters[i],
jaroslav@909:                     propsGettersAndSetters[i + 1],
jaroslav@909:                     propsGettersAndSetters[i + 2],
jaroslav@909:                     getter.getReturnType().isPrimitive(),
jaroslav@909:                     List.class.isAssignableFrom(getter.getReturnType()));
jaroslav@909:             } catch (NoSuchMethodException ex) {
jaroslav@909:                 throw new IllegalStateException(ex.getMessage());
jaroslav@909:             }
jaroslav@909:         }
jaroslav@909:         for (int i = 0; i < methodsAndSignatures.length; i += 2) {
jaroslav@909:             expose(
jaroslav@909:                 bindings, model, methodsAndSignatures[i], methodsAndSignatures[i + 1]);
jaroslav@909:         }
jaroslav@909:     }
jaroslav@492: }