[qt] Support feature collection for GeoJSON source data

This commit adds support of `QVector<QMapbox::Feature>`
and `QList<QMapbox::Feature>` for data in GeoJSON source.

1 files changed, 18 insertions, 1 deletions

diff --git a/platform/qt/src/qt_conversion.hpp b/platform/qt/src/qt_conversion.hpp
index 070a3dd375..6927f2510a 100644
--- a/platform/qt/src/qt_conversion.hpp
+++ b/platform/qt/src/qt_conversion.hpp
@@ -35,7 +35,9 @@ public:
     static bool isObject(const QVariant& value) {
         return value.canConvert(QVariant::Map)
             || value.type() == QVariant::ByteArray
-            || QString(value.typeName()) == QStringLiteral("QMapbox::Feature");
+            || QString(value.typeName()) == QStringLiteral("QMapbox::Feature")
+            || value.userType() == qMetaTypeId<QVector<QMapbox::Feature>>()
+            || value.userType() == qMetaTypeId<QList<QMapbox::Feature>>();
     }
 
     static optional<QVariant> objectMember(const QVariant& value, const char* key) {
@@ -119,6 +121,10 @@ public:
     static optional<GeoJSON> toGeoJSON(const QVariant& value, Error& error) {
         if (value.typeName() == QStringLiteral("QMapbox::Feature")) {
             return GeoJSON { asMapboxGLFeature(value.value<QMapbox::Feature>()) };
+        } else if (value.userType() == qMetaTypeId<QVector<QMapbox::Feature>>()) {
+            return featureCollectionToGeoJSON(value.value<QVector<QMapbox::Feature>>());
+        } else if (value.userType() == qMetaTypeId<QList<QMapbox::Feature>>()) {
+            return featureCollectionToGeoJSON(value.value<QList<QMapbox::Feature>>());
         } else if (value.type() != QVariant::ByteArray) {
             error = { "JSON data must be in QByteArray" };
             return {};
@@ -127,6 +133,17 @@ public:
         QByteArray data = value.toByteArray();
         return parseGeoJSON(std::string(data.constData(), data.size()), error);
     }
+
+private:
+    template<typename T>
+    static GeoJSON featureCollectionToGeoJSON(const T &features) {
+        mapbox::feature::feature_collection<double> collection;
+        collection.reserve(static_cast<std::size_t>(features.size()));
+        for (const auto &feature : features) {
+            collection.push_back(asMapboxGLFeature(feature));
+        }
+        return GeoJSON { std::move(collection) };
+    }
 };
 
 template <class T, class...Args>