QmlJS: Fix palette support

Fixes false positive warnings of having no members
and allows to auto-complete its members.

Fixes: QTCREATORBUG-23659
Change-Id: I4da43b9d3f005f9c6cc759ec424bf67062beff78
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/libs/qmljs/qmljsinterpreter.cpp

@@ -395,6 +395,8 @@ const Value *CppComponentValue::valueForCppName(const QString &typeName) const
         return valueOwner()->realValue();
     } else if (typeName == QLatin1String("QFont")) {
         return valueOwner()->qmlFontObject();
+    } else if (typeName == QLatin1String("QPalette")) {
+        return valueOwner()->qmlPaletteObject();
     } else if (typeName == QLatin1String("QPoint")
             || typeName == QLatin1String("QPointF")
             || typeName == QLatin1String("QVector2D")) {

src/libs/qmljs/qmljsvalueowner.cpp

@@ -95,6 +95,7 @@ public:
     ObjectValue *_mathObject;
     ObjectValue *_qtObject;
     ObjectValue *_qmlFontObject;
+    ObjectValue *_qmlPaletteObject;
     ObjectValue *_qmlPointObject;
     ObjectValue *_qmlSizeObject;
     ObjectValue *_qmlRectObject;
@@ -496,6 +497,28 @@ SharedValueOwner::SharedValueOwner(SharedValueOwnerKind kind)
     _qmlFontObject->setMember(QLatin1String("kerning"), booleanValue());
     _qmlFontObject->setMember(QLatin1String("preferShaping"), booleanValue());
 
+    _qmlPaletteObject = newObject(/* prototype = */ nullptr);
+    _qmlPaletteObject->setClassName(QLatin1String("palette"));
+    _qmlPaletteObject->setMember(QLatin1String("alternateBase"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("base"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("brightText"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("button"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("buttonText"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("dark"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("highlight"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("highlightedText"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("light"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("link"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("linkVisited"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("mid"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("midlight"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("shadow"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("text"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("toolTipBase"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("toolTipText"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("window"), colorValue());
+    _qmlPaletteObject->setMember(QLatin1String("windowText"), colorValue());
+
     _qmlPointObject = newObject(/*prototype =*/ nullptr);
     _qmlPointObject->setClassName(QLatin1String("Point"));
     _qmlPointObject->setMember(QLatin1String("x"), numberValue());
@@ -896,6 +919,11 @@ const ObjectValue *ValueOwner::qmlFontObject()
     return _shared->_qmlFontObject;
 }
 
+const ObjectValue *ValueOwner::qmlPaletteObject()
+{
+    return _shared->_qmlPaletteObject;
+}
+
 const ObjectValue *ValueOwner::qmlPointObject()
 {
     return _shared->_qmlPointObject;

src/libs/qmljs/qmljsvalueowner.h

@@ -82,6 +82,7 @@ public:
 
     // QML objects
     const ObjectValue *qmlFontObject();
+    const ObjectValue *qmlPaletteObject();
     const ObjectValue *qmlPointObject();
     const ObjectValue *qmlSizeObject();
     const ObjectValue *qmlRectObject();