Macro for QML items with data property boilerplate

This macro gives items the ability to hold children.
Use the new macro on various types to let compositors
declare children from QML.

Change-Id: I291cc69fc11653bc3d677d148e002330a3245173
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/compositor/global/qwaylandquickextension.h b/src/compositor/global/qwaylandquickextension.h
index c721bcb97..a0e07dad3 100644
--- a/src/compositor/global/qwaylandquickextension.h
+++ b/src/compositor/global/qwaylandquickextension.h
@@ -107,6 +107,42 @@ QT_BEGIN_NAMESPACE
         QList<QObject *> m_objects; \
     };
 
+#define Q_COMPOSITOR_DECLARE_QUICK_PARENT_CLASS(className) \
+    class Q_WAYLAND_COMPOSITOR_EXPORT className##QuickParent : public className \
+    { \
+/* qmake ignore Q_OBJECT */ \
+        Q_OBJECT \
+        Q_PROPERTY(QQmlListProperty<QObject> data READ data DESIGNABLE false) \
+        Q_CLASSINFO("DefaultProperty", "data") \
+    public: \
+        QQmlListProperty<QObject> data() \
+        { \
+            return QQmlListProperty<QObject>(this, this, \
+                                             &className##QuickParent::appendFunction, \
+                                             &className##QuickParent::countFunction, \
+                                             &className##QuickParent::atFunction, \
+                                             &className##QuickParent::clearFunction); \
+        } \
+        static void appendFunction(QQmlListProperty<QObject> *list, QObject *object) \
+        { \
+            static_cast<className##QuickParent *>(list->data)->m_children.append(object); \
+        } \
+        static int countFunction(QQmlListProperty<QObject> *list) \
+        { \
+            return static_cast<className##QuickParent *>(list->data)->m_children.size(); \
+        } \
+        static QObject *atFunction(QQmlListProperty<QObject> *list, int index) \
+        { \
+            return static_cast<className##QuickParent *>(list->data)->m_children.at(index); \
+        } \
+        static void clearFunction(QQmlListProperty<QObject> *list) \
+        { \
+            static_cast<className##QuickParent *>(list->data)->m_children.clear(); \
+        } \
+    private: \
+        QVector<QObject *> m_children; \
+    };
+
 QT_END_NAMESPACE
 
 #endif  /*QWAYLANDQUICKEXTENSION_H*/