# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@apidesign.org>
# Date 1363623420 -3600
# Node ID c285a78302afd0c5a4fb05452512c151da1c24bb
# Parent  859804c78010bded0fa46b1450c87582dfda723e
Knockout bindings for primitive types supported in WebView

diff -r 859804c78010 -r c285a78302af javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/Knockout.java
--- a/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/Knockout.java	Thu Mar 14 09:22:28 2013 +0100
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/Knockout.java	Mon Mar 18 17:17:00 2013 +0100
@@ -17,7 +17,14 @@
  */
 package org.apidesign.bck2brwsr.htmlpage;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
 import java.lang.reflect.Method;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javafx.scene.web.WebEngine;
+import netscape.javascript.JSObject;
 import org.apidesign.bck2brwsr.core.ExtraJavaScript;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 
@@ -27,19 +34,43 @@
  */
 @ExtraJavaScript(resource = "/org/apidesign/bck2brwsr/htmlpage/knockout-2.2.1.js")
 public class Knockout {
+    private static final Logger LOG = Logger.getLogger(Knockout.class.getName());
     /** used by tests */
     static Knockout next;
     
-    Knockout() {
+    static {
+        BufferedReader r = new BufferedReader(new InputStreamReader(Knockout.class.getResourceAsStream("knockout-2.2.1.js")));
+        StringBuilder sb = new StringBuilder();
+        for (;;) {
+            try {
+                String l = r.readLine();
+                if (l == null) {
+                    break;
+                }
+                sb.append(l).append('\n');
+            } catch (IOException ex) {
+                throw new IllegalStateException(ex);
+            }
+        }
+        web().executeScript(sb.toString());
+        Object ko = web().executeScript("ko");
+        assert ko != null : "Knockout library successfully defined 'ko'";
+    }
+    
+    
+    private final Object bindings;
+    
+    Knockout(Object bindings) {
+        this.bindings = bindings;
     }
     
     public static <M> Knockout applyBindings(
         Class<M> modelClass, M model, String[] propsGettersAndSetters
     ) {
-        Knockout bindings = next;
+        Object bindings = next;
         next = null;
         if (bindings == null) {
-            bindings = new Knockout();
+            bindings = web().executeScript("new Object()");
         }
         for (int i = 0; i < propsGettersAndSetters.length; i += 4) {
             try {
@@ -54,13 +85,16 @@
             }
         }
         applyBindings(bindings);
-        return bindings;
+        return new Knockout(bindings);
     }
 
     @JavaScriptBody(args = { "prop" }, body =
         "this[prop].valueHasMutated();"
     )
     public void valueHasMutated(String prop) {
+        LOG.log(Level.INFO, "property mutated: {0}", prop);
+        JSObject koProp = (JSObject) ((JSObject)bindings).getMember(prop);
+        koProp.call("valueHasMutated");
     }
     
 
@@ -86,8 +120,48 @@
     private static void bind(
         Object bindings, Object model, String prop, String getter, String setter, boolean primitive
     ) {
+        WebEngine e = web();
+        JSObject bnd = (JSObject) e.executeScript("var x = {}; x.bnd = "
+        + "new Function('ko', 'bindings', 'model', 'prop', 'getter', 'setter', 'primitive', '"
+        + "var bnd = {"
+        + "  read: function() {"
+        + "    try {"
+        + "      return model[getter]();"
+        + "    } catch (e) {"
+        + "      alert(\"Cannot call \" + getter + \" on \" + model + \" error: \" + e);"
+        + "    }"
+        + "  },"
+        + "  owner: bindings"
+        + "};"
+        + "if (setter != null) {"
+        + "  bnd.write = function(val) {"
+        + "    model[setter](primitive ? new Number(val) : val);"
+        + "  };"
+        + "};"
+        + "bindings[prop] = ko.computed(bnd);'"
+        + "); x;");
+        
+        Object ko = e.executeScript("ko");
+        bnd.call("bnd", ko, bindings, model, prop, strip(getter), strip(setter), primitive);
+        LOG.log(Level.INFO, "binding defined for {0}: {1}", new Object[]{prop, ((JSObject)bindings).getMember(prop)});
+    }
+    
+    private static String strip(String mangled) {
+        if (mangled == null) {
+            return null;
+        }
+        int under = mangled.indexOf("__");
+        return mangled.substring(0, under);
     }
     
     @JavaScriptBody(args = { "bindings" }, body = "ko.applyBindings(bindings);")
-    private static void applyBindings(Object bindings) {}
+    private static void applyBindings(Object bindings) {
+        JSObject ko = (JSObject) web().executeScript("ko");
+        ko.call("applyBindings", bindings);
+    }
+    
+    private static WebEngine web() {
+        return (WebEngine) System.getProperties().get("webEngine");
+    }
+    
 }
diff -r 859804c78010 -r c285a78302af javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PageProcessor.java
--- a/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PageProcessor.java	Thu Mar 14 09:22:28 2013 +0100
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PageProcessor.java	Mon Mar 18 17:17:00 2013 +0100
@@ -98,7 +98,7 @@
                 try {
                     w.append("package " + pkg + ";\n");
                     w.append("import org.apidesign.bck2brwsr.htmlpage.api.*;\n");
-                    w.append("final class ").append(className).append(" {\n");
+                    w.append("public final class ").append(className).append(" {\n");
                     w.append("  private boolean locked;\n");
                     if (!initializeOnClick(className, (TypeElement) e, w, pp)) {
                         return false;
diff -r 859804c78010 -r c285a78302af javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/ModelTest.java
--- a/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/ModelTest.java	Thu Mar 14 09:22:28 2013 +0100
+++ b/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/ModelTest.java	Mon Mar 18 17:17:00 2013 +0100
@@ -110,6 +110,10 @@
     
     static class MockKnockout extends Knockout {
         List<String> mutated = new ArrayList<String>();
+
+        public MockKnockout() {
+            super(new Object());
+        }
         
         @Override
         public void valueHasMutated(String prop) {