Allow aliases to value type properties

Task-number: QTBUG-14254

3 files changed, 62 insertions, 9 deletions

diff --git a/src/declarative/qml/qdeclarativecompiler.cpp b/src/declarative/qml/qdeclarativecompiler.cpp
index 7a29f24eba..74bc5bd9b0 100644
--- a/src/declarative/qml/qdeclarativecompiler.cpp
+++ b/src/declarative/qml/qdeclarativecompiler.cpp
@@ -2565,8 +2565,8 @@ bool QDeclarativeCompiler::compileAlias(QMetaObjectBuilder &builder,
 
     QStringList alias = astNodeToStringList(node);
 
-    if (alias.count() != 1 && alias.count() != 2)
-        COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias reference. An alias reference must be specified as <id> or <id>.<property>"));
+    if (alias.count() < 1 || alias.count() > 3)
+        COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias reference. An alias reference must be specified as <id>, <id>.<property> or <id>.<value property>.<property>"));
 
     if (!compileState.ids.contains(alias.at(0)))
         COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias reference. Unable to find id \"%1\"").arg(alias.at(0)));
@@ -2578,11 +2578,14 @@ bool QDeclarativeCompiler::compileAlias(QMetaObjectBuilder &builder,
     int propIdx = -1;
     int flags = 0;
     bool writable = false;
-    if (alias.count() == 2) {
+    if (alias.count() == 2 || alias.count() == 3) {
         propIdx = idObject->metaObject()->indexOfProperty(alias.at(1).toUtf8().constData());
 
-        if (-1 == propIdx)
+        if (-1 == propIdx) {
             COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias location"));
+        } else if (propIdx > 0xFFFF) {
+            COMPILE_EXCEPTION(prop.defaultValue, tr("Alias property exceeds alias bounds"));
+        }
 
         QMetaProperty aliasProperty = idObject->metaObject()->property(propIdx);
         if (!aliasProperty.isScriptable())
@@ -2590,6 +2593,22 @@ bool QDeclarativeCompiler::compileAlias(QMetaObjectBuilder &builder,
 
         writable = aliasProperty.isWritable();
 
+        if (alias.count() == 3) {
+            QDeclarativeValueType *valueType = enginePrivate->valueTypes[aliasProperty.type()];
+            if (!valueType)
+                COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias location"));
+
+            propIdx |= ((unsigned int)aliasProperty.type()) << 24;
+
+            int valueTypeIndex = valueType->metaObject()->indexOfProperty(alias.at(2).toUtf8().constData());
+            if (valueTypeIndex == -1)
+                COMPILE_EXCEPTION(prop.defaultValue, tr("Invalid alias location"));
+            Q_ASSERT(valueTypeIndex <= 0xFF);
+            
+            aliasProperty = valueType->metaObject()->property(valueTypeIndex);
+            propIdx |= (valueTypeIndex << 16);
+        }
+
         if (aliasProperty.isEnumType()) 
             typeName = "int";  // Avoid introducing a dependency on the aliased metaobject
         else
diff --git a/src/declarative/qml/qdeclarativevmemetaobject.cpp b/src/declarative/qml/qdeclarativevmemetaobject.cpp
index 37f08fca9d..e28062b9d9 100644
--- a/src/declarative/qml/qdeclarativevmemetaobject.cpp
+++ b/src/declarative/qml/qdeclarativevmemetaobject.cpp
@@ -459,7 +459,7 @@ int QDeclarativeVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
             id -= propOffset;
 
             if (id < metaData->propertyCount) {
-                int t = (metaData->propertyData() + id)->propertyType;
+               int t = (metaData->propertyData() + id)->propertyType;
                 bool needActivate = false;
 
                 if (t == -1) {
@@ -586,11 +586,26 @@ int QDeclarativeVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 
                 connectAlias(id);
 
-                if (d->propertyIdx == -1) {
+                if (d->isObjectAlias()) {
                     *reinterpret_cast<QObject **>(a[0]) = target;
                     return -1;
+                } else if (d->isValueTypeAlias()) {
+                    // Value type property
+                    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);
+
+                    QDeclarativeValueType *valueType = ep->valueTypes[d->valueType()];
+                    Q_ASSERT(valueType);
+
+                    valueType->read(target, d->propertyIndex());
+                    int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
+                    
+                    if (c == QMetaObject::WriteProperty)
+                        valueType->write(target, d->propertyIndex(), 0x00);
+
+                    return rv;
+
                 } else {
-                    return QMetaObject::metacall(target, c, d->propertyIdx, a);
+                    return QMetaObject::metacall(target, c, d->propertyIndex(), a);
                 }
 
             }
@@ -823,8 +838,8 @@ void QDeclarativeVMEMetaObject::connectAlias(int aliasId)
         int sigIdx = methodOffset + aliasId + metaData->propertyCount;
         QMetaObject::connect(context, d->contextIdx + ctxtPriv->notifyIndex, object, sigIdx);
 
-        if (d->propertyIdx != -1) {
-            QMetaProperty prop = target->metaObject()->property(d->propertyIdx);
+        if (!d->isObjectAlias()) {
+            QMetaProperty prop = target->metaObject()->property(d->propertyIndex());
             if (prop.hasNotifySignal())
                 QDeclarativePropertyPrivate::connect(target, prop.notifySignalIndex(), object, sigIdx);
         }
diff --git a/src/declarative/qml/qdeclarativevmemetaobject_p.h b/src/declarative/qml/qdeclarativevmemetaobject_p.h
index 4ccaa734ee..5134763de1 100644
--- a/src/declarative/qml/qdeclarativevmemetaobject_p.h
+++ b/src/declarative/qml/qdeclarativevmemetaobject_p.h
@@ -84,6 +84,25 @@ struct QDeclarativeVMEMetaData
         int contextIdx;
         int propertyIdx;
         int flags;
+
+        bool isObjectAlias() const {
+            return propertyIdx == -1;
+        }
+        bool isPropertyAlias() const {
+            return !isObjectAlias() && !(propertyIdx & 0xFF000000);
+        }
+        bool isValueTypeAlias() const {
+            return !isObjectAlias() && (propertyIdx & 0xFF000000);
+        }
+        int propertyIndex() const {
+            return propertyIdx & 0x0000FFFF;
+        }
+        int valueTypeIndex() const {
+            return (propertyIdx & 0x00FF0000) >> 16;
+        }
+        int valueType() const {
+            return ((unsigned int)propertyIdx) >> 24;
+        }
     };
     
     struct PropertyData {