fix two bugs in the custom script class example

1) fromScriptValue() needs to call qvariant_cast() on the data, in
order to be symmetric with toScriptValue().
2) use the overload of newFunction() that takes a prototype object,
so that the prototype.constructor and constructor.prototype
relationship is set up correctly; otherwise the instanceof operator
won't work.

2 files changed, 10 insertions, 3 deletions

diff --git a/examples/script/customclass/bytearrayclass.cpp b/examples/script/customclass/bytearrayclass.cpp
index 81a0b8a..2044a16 100644
--- a/examples/script/customclass/bytearrayclass.cpp
+++ b/examples/script/customclass/bytearrayclass.cpp
@@ -100,7 +100,7 @@ ByteArrayClass::ByteArrayClass(QScriptEngine *engine)
     QScriptValue global = engine->globalObject();
     proto.setPrototype(global.property("Object").property("prototype"));
 
-    ctor = engine->newFunction(construct);
+    ctor = engine->newFunction(construct, proto);
     ctor.setData(qScriptValueFromValue(engine, this));
 }
 //! [0]
@@ -224,7 +224,10 @@ QScriptValue ByteArrayClass::construct(QScriptContext *ctx, QScriptEngine *)
     ByteArrayClass *cls = qscriptvalue_cast<ByteArrayClass*>(ctx->callee().data());
     if (!cls)
         return QScriptValue();
-    int size = ctx->argument(0).toInt32();
+    QScriptValue arg = ctx->argument(0);
+    if (arg.instanceOf(ctx->callee()))
+        return cls->newInstance(qscriptvalue_cast<QByteArray>(arg));
+    int size = arg.toInt32();
     return cls->newInstance(size);
 }
 //! [2]
@@ -240,7 +243,7 @@ QScriptValue ByteArrayClass::toScriptValue(QScriptEngine *eng, const QByteArray
 
 void ByteArrayClass::fromScriptValue(const QScriptValue &obj, QByteArray &ba)
 {
-    ba = qscriptvalue_cast<QByteArray>(obj.data());
+    ba = qvariant_cast<QByteArray>(obj.data().toVariant());
 }
 
 
diff --git a/examples/script/customclass/main.cpp b/examples/script/customclass/main.cpp
index 05aefd5..3b98f5c 100644
--- a/examples/script/customclass/main.cpp
+++ b/examples/script/customclass/main.cpp
@@ -52,6 +52,7 @@ int main(int argc, char **argv)
     eng.globalObject().setProperty("ByteArray", baClass->constructor());
 
     qDebug() << "ba = new ByteArray(4):" << eng.evaluate("ba = new ByteArray(4)").toString();
+    qDebug() << "ba instanceof ByteArray:" << eng.evaluate("ba instanceof ByteArray").toBool();
     qDebug() << "ba.length:" << eng.evaluate("ba.length").toNumber();
     qDebug() << "ba[1] = 123; ba[1]:" << eng.evaluate("ba[1] = 123; ba[1]").toNumber();
     qDebug() << "ba[7] = 224; ba.length:" << eng.evaluate("ba[7] = 224; ba.length").toNumber();
@@ -65,6 +66,9 @@ int main(int argc, char **argv)
     qDebug() << "ba.toBase64().toLatin1String():" << eng.evaluate("b64.toLatin1String()").toString();
     qDebug() << "ba.valueOf():" << eng.evaluate("ba.valueOf()").toString();
     qDebug() << "ba.chop(2); ba.length:" << eng.evaluate("ba.chop(2); ba.length").toNumber();
+    qDebug() << "ba2 = new ByteArray(ba):" << eng.evaluate("ba2 = new ByteArray(ba)").toString();
+    qDebug() << "ba2.equals(ba):" << eng.evaluate("ba2.equals(ba)").toBool();
+    qDebug() << "ba2.equals(new ByteArray()):" << eng.evaluate("ba2.equals(new ByteArray())").toBool();
 
     return 0;
 }