Allow literal enum to int property assignments

Previously, enum to int property assignments were considered bindings.
This commit adds support for assigning enum values to int properties
as enums.

Note that to use an enum in QML, it must have been declared with
Q_ENUMS or otherwise registered as a metatype.  Enum values from the
global Qt object are also usable.

Task-number: QTBUG-23403
Change-Id: I50db6cae54a24400ea472bde43619d547e4ceb78
Reviewed-by: Michael Brasser <michael.brasser@nokia.com>

src/qml/qml/qqmlcompiler.cpp

@@ -2227,7 +2227,7 @@ bool QQmlCompiler::buildValueTypeProperty(QObject *type,
                 //optimization for <Type>.<EnumValue> enum assignments
                 bool isEnumAssignment = false;
 
-                if (prop->core.isEnum()) 
+                if (prop->core.isEnum() || prop->core.propType == QMetaType::Int)
                     COMPILE_CHECK(testQualifiedEnumAssignment(prop, obj, value, &isEnumAssignment));
 
                 if (isEnumAssignment) {
@@ -2495,7 +2495,7 @@ bool QQmlCompiler::buildPropertyLiteralAssignment(QQmlScript::Property *prop,
     if (v->value.isScript()) {
 
         //optimization for <Type>.<EnumValue> enum assignments
-        if (prop->core.isEnum()) {
+        if (prop->core.isEnum() || prop->core.propType == QMetaType::Int) {
             bool isEnumAssignment = false;
             COMPILE_CHECK(testQualifiedEnumAssignment(prop, obj, v, &isEnumAssignment));
             if (isEnumAssignment) {
@@ -2525,8 +2525,9 @@ bool QQmlCompiler::testQualifiedEnumAssignment(QQmlScript::Property *prop,
                                                        QQmlScript::Value *v,
                                                        bool *isAssignment)
 {
+    bool isIntProp = (prop->core.propType == QMetaType::Int) && !prop->core.isEnum();
     *isAssignment = false;
-    if (!prop->core.isEnum())
+    if (!prop->core.isEnum() && !isIntProp)
         return true;
 
     QMetaProperty mprop = obj->metaObject()->property(prop->index);
@@ -2538,6 +2539,17 @@ bool QQmlCompiler::testQualifiedEnumAssignment(QQmlScript::Property *prop,
     if (!string.at(0).isUpper())
         return true;
 
+    if (isIntProp) {
+        // Allow enum assignment to ints.
+        int enumval = evaluateEnum(string.toUtf8());
+        if (enumval != -1) {
+            v->type = Value::Literal;
+            v->value = QQmlScript::Variant((double)enumval);
+            *isAssignment = true;
+        }
+        return true;
+    }
+
     QStringList parts = string.split(QLatin1Char('.'));
     if (parts.count() != 2)
         return true;

tests/auto/qml/qqmlecmascript/data/enums.3.qml

@@ -0,0 +1,41 @@
+import QtQuick 2.0
+import Qt.test 1.0
+import Qt.test 1.0 as Namespace
+
+Item {
+    // Enums from type
+    property int a: Item.Center
+    property int b: Item.Right
+
+    // Enums from Qt
+    property int c: Qt.blue
+    property int d: Qt.darkRed
+
+    // Enums from other type
+    property int e: MyQmlObject.EnumValue3
+    property int f: MyQmlObject.EnumValue4
+
+    // Enums from namespaced other type
+    property int h: Namespace.MyQmlObject.EnumValue3
+    property int i: Namespace.MyQmlObject.EnumValue4
+
+    // Count the onChanged signals to see whether
+    // they're assigned as literals or via bindings
+    property int ac: 0
+    property int bc: 0
+    property int cc: 0
+    property int dc: 0
+    property int ec: 0
+    property int fc: 0
+    property int hc: 0
+    property int ic: 0
+
+    onAChanged: ac++
+    onBChanged: bc++
+    onCChanged: cc++
+    onDChanged: dc++
+    onEChanged: ec++
+    onFChanged: fc++
+    onHChanged: hc++
+    onIChanged: ic++
+}

tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp

@@ -846,6 +846,34 @@ void tst_qqmlecmascript::enums()
     QCOMPARE(object->property("a").toInt(), 0);
     QCOMPARE(object->property("b").toInt(), 0);
 
+    delete object;
+    }
+    // Enums as literals
+    {
+    QQmlComponent component(&engine, testFileUrl("enums.3.qml"));
+    QObject *object = component.create();
+    QVERIFY(object != 0);
+
+    // check the values are what we expect
+    QCOMPARE(object->property("a").toInt(), 4);
+    QCOMPARE(object->property("b").toInt(), 5);
+    QCOMPARE(object->property("c").toInt(), 9);
+    QCOMPARE(object->property("d").toInt(), 13);
+    QCOMPARE(object->property("e").toInt(), 2);
+    QCOMPARE(object->property("f").toInt(), 3);
+    QCOMPARE(object->property("h").toInt(), 2);
+    QCOMPARE(object->property("i").toInt(), 3);
+
+    // count of change signals
+    QCOMPARE(object->property("ac").toInt(), 0);
+    QCOMPARE(object->property("bc").toInt(), 0);
+    QCOMPARE(object->property("cc").toInt(), 0);
+    QCOMPARE(object->property("dc").toInt(), 0);
+    QCOMPARE(object->property("ec").toInt(), 0);
+    QCOMPARE(object->property("fc").toInt(), 0);
+    QCOMPARE(object->property("hc").toInt(), 1); // namespace -> binding
+    QCOMPARE(object->property("ic").toInt(), 1); // namespace -> binding
+
     delete object;
     }
 }